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<document>
<title>Seabird</title>
<authors>Wikipedia</authors>
<publisher>wikipedia.org</publisher>
<publishedplace>network</publishedplace>
<publishedyear>2010</publishedyear>
<edition></edition>
<category>Featured articles</category>
<section id="14285" fatherid="0" title="" lv="" priority="-1" level="1">
Seabirds (also known as marine birds) are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations. The first seabirds evolved in the Cretaceous period, and modern seabird families emerged in the Paleogene.
In general, seabirds live longer, breed later and have fewer young than other birds do, but they invest a great deal of time in their young. Most species nest in colonies, which can vary in size from a few dozen birds to millions. Many species are famous for undertaking long annual migrations, crossing the equator or circumnavigating the Earth in some cases. They feed both at the ocean's surface and below it, and even feed on each other. Seabirds can be highly pelagic, coastal, or in some cases spend a part of the year away from the sea entirely.
Seabirds and humans have a long history together: they have provided food to hunters, guided fishermen to fishing stocks and led sailors to land. Many species are currently threatened by human activities, and conservation efforts are under way.

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<section id="14286" fatherid="0" title="Classification of  seabirds" lv="" priority="2" level="1">
There exists no single definition of which groups, families, and species are seabirds, and most definitions are in some way arbitrary. In the words of two seabird scientists, "The one common characteristic that all seabirds share is that they feed in saltwater; but, as seems to be true with any statement in biology, some do not."Schreiber, Elizabeth A. -anddocsymbol- Burger, Joanne.(2001.) Biology of Marine Birds,  Boca Raton:CRC Press, ISBN 0-8493-9882-7 However, by convention all of the penguins and Procellariiformes, all of the Pelecaniformes except the darters, and some of the Charadriiformes (the skuas, gulls, terns, auks and skimmers) are classified as seabirds. The phalaropes are usually included as well, since although they are waders ("shorebirds" in North America), two of the three species are oceanic for nine months of the year, crossing the equator to feed pelagically.
Loons and grebes, which nest on lakes but winter at sea, are usually categorized as water birds, not seabirds. Although there are a number of sea ducks in the family Anatidae which are truly marine in the winter, by convention they are usually excluded from the seabird grouping. Many waders (or shorebirds) and herons are also highly marine, living on the sea's edge (coast), but are also not treated as seabirds.

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<section id="14287" fatherid="0" title="Evolution and fossil record" lv="" priority="3" level="1">
Seabirds, by virtue of living in a geologically depositional environment (that is, in the sea where sediments are readily laid down), are well represented in the fossil record. They are first known to occur in the Cretaceous Period, the earliest being the Hesperornithiformes, like Hesperornis regalis, a flightless loon-like seabird that dove in a fashion similar to grebes and loons (using its feet to move underwater)Johansson LC, Lindhe Norberg UM. (2001) "Lift-based paddling in diving grebe." J Exp Biol. 204(10) :1687–96.  but had a beak filled with sharp teeth.Gregory, J. (1952) "The Jaws of the Cretaceous Toothed Birds, Ichthyornis and Hesperornis" Condor 54(2): 73–88  
While Hesperornis is not thought to have  descendants, the earliest modern seabirds also occurred in the Cretaceous, with a species called Tytthostonyx glauconiticus, which seems allied to the Procellariiformes and/or Pelecaniformes. In the Paleogene the seas were dominated by early Procellariidae, giant penguins and two extinct families, the Pelagornithidae and the Plotopteridae (a group of large seabirds that looked like the penguins).Goedert, J. (1989) "Giant Late Eocene Marine Birds (Pelecaniformes: Pelagornithidae) from Northwestern Oregon" Journal of Paleontology, 63(6) 939–944 Modern genera began their wide radiation in the Miocene, although the genus Puffinus (which includes today's Manx Shearwater and Sooty Shearwater) might date back to the Oligocene. The highest diversity of seabirds apparently existed during the Late Miocene and the Pliocene. At the end of the latter, the oceanic food web had undergone a period of upheaval due to extinction of considerable numbers of marine species;Possibly due to comparatively close (in astronomical terms - c. 150 light-years) supernova activity subsequently, the spread of marine mammals seems to have prevented seabirds from reaching their erstwhile diversity.Olson, S. -anddocsymbol- Hasegawa, Y. (1979)"Fossil Counterparts of Giant Penguins from the North Pacific" Science 206(4419): 688–689.

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<section id="14288" fatherid="0" title="Characteristics" lv="" priority="-4" level="1">
<section id="14289" fatherid="14288" title="Adaptations to life at sea" lv="" priority="1" level="2">
Seabirds have made numerous adaptations to living on and feeding in the sea. Wing morphology has been shaped by the niche an individual species or family has evolved, so that looking at a wing's shape and loading can tell a scientist about its life feeding behaviour. Longer wings and low wing loading are typical of more pelagic species, whilst diving species have shorter wings.Gaston, Anthony J. (2004). Seabirds: A Natural History New Haven:Yale University Press, ISBN 0-300-10406-5 Species such as the Wandering Albatross, which forage over huge areas of sea, have a reduced capacity for powered flight and are dependent on a type of gliding called dynamic soaring (where the wind deflected by waves provides lift) as well as slope soaring.Pennycuick, C. J. (1982). "The flight of petrels and albatrosses (Procellariiformes), observed in South Georgia and its vicinity". Philosophical Transactions of the Royal Society of London B 300: 75–106. Seabirds also almost always have webbed feet, to aid movement on the surface as well as assisting diving in some species. The Procellariiformes are unusual amongst birds in having a strong sense of smell, which is used to find widely distributed food in a vast ocean,Lequette, B., Verheyden, C., Jowentin, P. (1989) "Olfaction in Subantarctic seabirds: Its phylogenetic and ecological significance" The Condor 91: 732-135.   and possibly to locate their colonies.
Salt glands are used by seabirds to deal with the salt they ingest by drinking and feeding (particularly on crustaceans), and to help them osmoregulate.Harrison, C. S. (1990) Seabirds of Hawaii, Natural History and Conservation Ithica:Cornell University Press, ISBN 0-8014-2449-6 The excretions from these glands (which are positioned in the head of the birds, emerging from the nasal cavity) are almost pure sodium chloride.
With the exception of the cormorants and some terns, and in common with most other birds, all seabirds have waterproof plumage. However, compared to land birds, they have far more feathers protecting their bodies. This dense plumage is better able to protect the bird from getting wet, and cold is kept out by a dense layer of down feathers. The cormorants possess a layer of unique feathers that retain a smaller layer of air (compared to other diving birds) but otherwise soak up water.Grémillet, D, Chauvin, C, Wilson, R.P., Le Maho, Y. -anddocsymbol- Wanless, S. (2005) Unusual feather structure allows partial plumage wettability in diving great cormorants Phalacrocorax carbo." Journal of Avian Biology 36(1): 57–63. This allows them to swim without fighting the buoyancy that retaining air in the feathers causes, yet retain enough air to prevent the bird losing excessive heat through contact with water.
The plumage of most seabirds is less colourful than that of land birds, restricted in the main to variations of black, white or grey. A few species sport colourful plumes (such as the tropicbirds or some penguins), but most of the colour in seabirds appears in the bills and legs. The plumage of seabirds is thought in many cases to be for camouflage, both defensive (the colour of US Navy battleships is the same as that of Antarctic Prions, and in both cases it reduces visibility at sea) and aggressive (the white underside possessed by many seabirds helps hide them from prey below).

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<section id="14290" fatherid="14288" title="Diet and feeding" lv="" priority="2" level="2">
<section id="14291" fatherid="14290" title="" lv="" priority="-1" level="3">
Seabirds evolved to exploit different food resources in the world's seas and oceans, and to a great extent, their physiology and behaviour have been shaped by their diet. These evolutionary forces have often caused species in different families and even orders to evolve similar strategies and adaptations to the same problems, leading to remarkable convergent evolution, such as that between auks and penguins. There are four basic feeding strategies, or ecological guilds, for feeding at sea: surface feeding, pursuit diving, plunge diving, and predation of higher vertebrates; within these guilds there are multiple variations on the theme.
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<section id="14292" fatherid="14290" title="Surface feeding" lv="" priority="2" level="3">
Many seabirds feed on the ocean's surface, as the action of marine currents often concentrates food such as krill, forage fish, squid or other prey items within reach of a dipped head.
Surface feeding itself can be broken up into two different approaches, surface feeding while flying (for example as practiced by gadfly petrels, frigatebirds and  storm-petrels), and surface feeding whilst swimming (examples of which are practiced by fulmars, gulls, many of the shearwaters and gadfly petrels). Surface feeders in flight include some of the most acrobatic of seabirds, which either snatch morsels from the water (as do frigate-birds and some terns), or "walk", pattering and hovering on the water's surface, as some of the storm-petrels do.Withers, P.C (1979) "Aerodynamics and Hydrodynamics of the ‘Hovering’ Flight of Wilson'S Storm Petrel" Journal of Experimental Biology 80: 83–91  Many of these do not ever land in the water, and some, such as the frigatebirds, have difficulty getting airborne again should they do so.Metz, V. G., and E. A. Schreiber. 2002. Great Frigatebird (Fregata minor). In The Birds of North America, No. 681 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA. Another seabird family that does not land while feeding is the skimmer, which has a unique fishing method: flying along the surface with the lower mandible in the water—this shuts automatically when the bill touches something in the water. The skimmer's bill reflects its unusual lifestyle, with the lower mandible uniquely being longer than the upper one.
Surface feeders that swim often have unique bills as well, adapted for their specific prey. Prions have special bills with filters called lamellae to filter out plankton from mouthfuls of water,Brooke, M. (2004).  Albatrosses And Petrels Across The World Oxford University Press, Oxford, UK ISBN 0-19-850125-0  and many albatrosses and petrels have hooked bills to snatch fast-moving prey. Gulls have more generalised bills that reflect their more opportunistic lifestyle.

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<section id="14293" fatherid="14290" title="Pursuit diving" lv="" priority="3" level="3">
Pursuit diving exerts greater pressures (both evolutionary and physiological) on seabirds, but the reward is a greater area in which to feed than is available to surface feeders. Propulsion underwater can be provided by wings (as used by penguins, auks, diving petrels, and some other species of petrel) or feet (as used by cormorants, grebes, loons and several types of fish-eating ducks). Wing-propelled divers are generally faster than foot-propelled divers. In both cases, the use of wings or feet for diving has limited their utility in other situations: loons and grebes walk with extreme difficulty (if at all), penguins cannot fly, and auks have sacrificed flight efficiency in favour of underwater diving. For example, the razorbill (an Atlantic auk) requires 64% more energy to fly than a petrel of equivalent size.Gaston, Anthony J. -anddocsymbol- Jones, Ian L. (1998). The Auks Oxford:Oxford University Press, ISBN 0-19-854032-9 Many shearwaters are intermediate between the two, having longer wings than typical wing-propelled divers but heavier wing loadings than the other surface-feeding procellariids, leaving them capable of diving to considerable depths while still being efficient long-distance travellers. The most impressive diving exhibited by shearwaters is found in the Short-tailed Shearwater, which has been recorded diving below 70 m.Weimerskirch, H., Cherel, Y., (1998) Feeding ecology of short-tailed shearwaters: breeding in Tasmania and foraging in the Antarctic? Marine Ecology Progress Series 167: 261–274  Some albatross species are also capable of some limited diving, with Light-mantled Sooty Albatrosses holding the record at 12 m.Prince, P.A., Huin, N., Weimerskirch, H., (1994) "Diving depths of albatrosses" Antarctic Science 6: (3) 353–354. Of all the wing-propelled pursuit divers, the most efficient in the air are the albatrosses, and it is no coincidence that they are the poorest divers. This is the dominant guild in polar and subpolar environments, as it is energetically inefficient in warmer waters. With their poor flying ability, many wing-propelled pursuit divers are more limited in their foraging range than other guilds, especially during the breeding season when hungry chicks need regular feeding.
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<section id="14294" fatherid="14290" title="Plunge diving" lv="" priority="4" level="3">
Gannets, boobies, tropicbirds, some terns and Brown Pelicans all engage in plunge diving, taking fast moving prey by diving into the water from flight. Plunge diving allows birds to use the energy from the momentum of the dive to combat natural buoyancy (caused by air trapped in plumage),Ropert-Coudert Y., Grémillet D., Ryan P., Kato A., Naito Y. -anddocsymbol- Le Maho Y. (2004) " Between air and water: the plunge dive of the Cape Gannet Morus capensis" Ibis 146(2): 281–290 and thus uses less energy than the dedicated pursuit divers, allowing them to utilise more widely distributed food resources, for example, in impoverished tropical seas. In general, this is the most specialised method of hunting employed by seabirds; other non-specialists (such as gulls and skuas) may employ it but do so with less skill and from lower heights. In Brown Pelicans the skills of plunge diving take several years to fully develop—once mature, they can dive from 20 m (70 ft) above the water's surface, shifting the body before impact to avoid injury.Elliot, A. (1992) "Family Pelecanidae (Pelicans)" in Handbook of Birds of the World Vol 1. Barcelona:Lynx Editions, ISBN 84-87334-10-5 It has been suggested that plunge divers are restricted in their hunting grounds to clear waters that afford a view of their prey from the air,Ainley, D.G. (1977) "Feeding methods in seabirds: a comparison of polar and tropical nesting communities in the eastern Pacific Ocean". In: Llano, G.A. (Ed.). Adaptations within Antarctic ecosystems. Smithsonian Inst. Washington D.C. P 669–685. and while they are the dominant guild in the tropics, the link between plunge diving and water clarity is inconclusive. Haney, J.C. -anddocsymbol- Stone, A.E. (1988) "Seabird foraging tactics and water clarity: Are plunge divers really in the clear?" Marine Ecology Progress Series 49 1–9 Some plunge divers (as well as some surface feeders) are dependent on dolphins and tuna to push shoaling fish up towards the surface.Au, D.W.K. -anddocsymbol- Pitman, R.L. (1986) Seabird interactions with Dolphins and Tuna in the Eastern Tropical Pacific. Condor,  88: 304–317.
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<section id="14295" fatherid="14290" title="Kleptoparasitism, scavenging and predation" lv="" priority="5" level="3">
" Condor 96: 331–340 Many species of gull will feed on seabird and sea mammal carrion when the opportunity arises, as will giant petrels. Some species of albatross also engage in scavenging: an analysis of regurgitated squid beaks has shown that many of the squid eaten are too large to have been caught alive, and include mid-water species likely to be beyond the reach of albatrosses.Croxall, J.P. -anddocsymbol- Prince, P.A. (1994). "Dead or alive, night or day: how do albatrosses catch squid?" Antarctic Science 6: 155–162. Some species will also feed on other seabirds; for example, gulls, skuas and giant petrels will often take eggs, chicks and even small adult seabirds from nesting colonies.Punta, G, Herrera, G. (1995) "Predation by Southern Giant Petrels Macronectes giganteus on adult Imperial Cormorants Phalacrocorax atriceps" Marine Ornithology 23 166-167
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<section id="14296" fatherid="14288" title="Life history" lv="" priority="3" level="2">
Seabirds' life histories are dramatically different from those of land birds. In general, they are K-selected, live much longer (anywhere between twenty and sixty years), delay breeding for longer (for up to ten years), and invest more effort into fewer young.Robertson, C.J.R. (1993). "Survival and longevity of the Northern Royal Albatross Diomedea epomophora sanfordi at Taiaroa Head" 1937–93. Emu 93: 269–276. Most species will only have one clutch a year, unless they lose the first (with a few exceptions, like the Cassin's Auklet),Manuwal, D. A. and A. C. Thoresen. 1993. Cassin’s Auklet (Ptychoramphus aleuticus). In The Birds of North America, No. 50 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union. and many species (like the tubenoses and sulids), only one egg a year.
Care of young is protracted, extending for as long as six months, among the longest for birds. For example, once Common Guillemot chicks fledge, they remain with the male parent for several months at sea. The frigatebirds have the longest period of parental care of any bird, with the chicks fledging after four to six months and with continued assistance after that for up to fourteen months.Metz, V.G. -anddocsymbol- Schreiber, E.A. (2002) "Great Frigatebird (Fregata minor)" In The Birds of North America, No 681, (Poole, A. -anddocsymbol- Gill, F., eds) The Birds of North America Inc:Philadelphia Due to the extended period of care, breeding occurs every two years rather than annually for some species. This life-history strategy has probably evolved both in response to the challenges of living at sea (collecting widely scattered prey items), the frequency of breeding failures due to unfavourable marine conditions, and the relative lack of predation compared to that of land-living birds.
Because of the greater investment in raising the young and because foraging for food may occur far from the nest site, in all seabird species except the phalaropes, both parents participate in caring for the young, and pairs are typically at least seasonally monogamous. Many species, such as gulls, auks and penguins, retain the same mate for several seasons, and many petrel species mate for life. The albatrosses and procellariids which mate for life can take many years to form a pair bond before they breed, and the albatrosses have an elaborate breeding dance that is part of pair-bond formation.Pickering, S.P.C., -anddocsymbol- Berrow, S.D., (2001) "Courtship behaviour of the Wandering Albatross Diomedea exulans at Bird Island, South Georgia" Marine Ornithology 29: 29–37

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<section id="14297" fatherid="14288" title="Breeding and colonies" lv="" priority="4" level="2">
See also Seabird colony
Ninety-five per cent of seabirds are colonial, and seabird colonies are amongst the largest bird colonies in the world, providing one of Earth's great wildlife spectacles. Colonies of over a million birds have been recorded, both in the tropics (such as Kiritimati in the Pacific) and in the polar latitudes (as in Antarctica). Seabird colonies occur exclusively for the purpose of breeding; non-breeding birds will only collect together outside the breeding season in areas where prey species are densely aggregated.
Seabird colonies are highly variable. Individual nesting sites can be widely spaced, as in an albatross colony, or densely packed as with a murre colony. In most seabird colonies, several different species will nest on the same colony, often exhibiting some niche separation. Seabirds can nest in trees (if any are available), on the ground (with or without nests), on cliffs, in burrows under the ground and in rocky crevices. Competition can be strong both within species and between species, with aggressive species such as Sooty Terns pushing less dominant species out of the most desirable nesting spaces.Schreiber, E. A., C. J. Feare, B. A. Harrington, B. G. Murray, Jr., W. B. Robertson, Jr., M. J. Robertson, and G. E. Woolfenden. 2002. Sooty Tern (Sterna fuscata). In The Birds of North America, No. 665 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA. The tropical Bonin Petrel nests during the winter to avoid competition with the more aggressive Wedge-tailed Shearwater. When the seasons overlap, the Wedge-tailed Shearwaters will kill young Bonin Petrels in order to use their burrows.Seto, N. W. H., and D. O'Daniel. (1999) Bonin Petrel (Pterodroma hypoleuca). In The Birds of North America, No. 385 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.
Many seabirds show remarkable site fidelity, returning to the same burrow, nest or site for many years, and they will defend that site from rivals with great vigour. This increases breeding success, provides a place for returning mates to reunite, and reduces the costs of prospecting for a new site.Bried, J.L., Pontier, D., Jouventin, P., (2003) "Mate fidelity in monogamous birds: a re-examination of the Procellariiformes" Animal Behaviour 65: 235–246 Young adults breeding for the first time usually return to their natal colony, and often nest close to where they hatched. This tendency, known as philopatry, is so strong that a study of Laysan Albatrosses found that the average distance between hatching site and the site where a bird established its own territory was 22 m;Fisher, H.I., (1976) "Some dynamics of a breeding colony of Laysan Albatrosses.  Wilson Bulletin 88: 121–142. another study, this time on Cory's Shearwaters nesting near Corsica, found that of nine out of 61 male chicks that returned to breed at their natal colony bred in the burrow they were raised in, and two actually bred with their own mother.Rabouam, C., Thibault, J.-C., Bretagnole, V., (1998) "Natal Philopatry and Close Inbreeding in Cory's Shearwater (Calonectris diomedea)" Auk 115(2): 483–486  
Colonies are usually situated on islands, cliffs or headlands which land mammals have difficulty accessing.Moors, P.J.; Atkinson, I.A.E. (1984). Predation on seabirds by introduced animals, and factors affecting its severity.. In Status and Conservation of the World's Seabirds. Cambridge: ICBP. ISBN 0-946888-03-5. This is thought to provide protection to seabirds, which are often very clumsy on land. Coloniality often arises in types of bird which do not defend feeding territories (such as swifts, which have a very variable prey source); this may be a reason why it arises more frequently in seabirds. There are other possible advantages: colonies may act as information centres, where seabirds returning to the sea to forage can find out where prey is by studying returning individuals of the same species. There are disadvantages to colonial life, particularly the spread of disease. Colonies also attract the attention of predators, principally other birds, and many species attend their colonies nocturnally to avoid predation.Keitt, B.S., Tershy, B.R. -anddocsymbol- Croll, D.A (2004). "Nocturnal behavior reduces predation pressure on Black-vented Shearwaters Puffinus opisthomelas" Marine Ornithology 32 (3): 173-178.

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<section id="14298" fatherid="14288" title="Migration" lv="" priority="5" level="2">
Other species also migrate shorter distances away from the breeding sites, their distribution at sea determined by the availability of food. If oceanic conditions are unsuitable, seabirds will emigrate to more productive areas, sometimes permanently if the bird is young.Oro, D., Cam, E., Pradel, R. -anddocsymbol- Martinetz-Abrain, A. (2004) "Influence of food availability on demography and local population dynamics in a long-lived seabird" Proc. R. Soc. London B. 271:387–396 After fledging, juvenile birds often disperse further than adults, and to different areas, so are commonly sighted far from a species' normal range. Some species, such as the auks, do not have a concerted migration effort, but drift southwards as the winter approaches. Other species, such as some of the storm-petrels, diving petrels and cormorants, never disperse at all, staying near their breeding colonies year round.
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<section id="14299" fatherid="14288" title="Away from the sea" lv="" priority="6" level="2">
While the definition of seabirds suggests that the birds in question spend their lives on the ocean, many seabird families have many species that spend some or even most of their lives inland away from the sea. Most strikingly, many species breed many tens, hundreds or even thousands of miles inland. Some of these species still return to the ocean to feed; for example, the Snow Petrel, the nests of which have been found 480 km (300 miles) inland on the Antarctic mainland, are unlikely to find anything to eat around their breeding sites.Croxall, J, Steele, W., McInnes, S, Prince, P. (1995)"Breeding Distribution of Snow Petrel Pagodroma nivea" Marine Ornithology 23 69–99   The Marbled Murrelet nests inland in old growth forest, seeking huge conifers with large branches to nest on.Nelson, S. K. 1997. Marbled Murrelet (Brachyramphus marmoratus). In The Birds of North America, No. 276 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists’ Union, Washington, D.C. Other species, such as the California Gull, nest and feed inland on lakes, and then move to the coasts in the winter.Winkler, D. W. 1996. California Gull (Larus californicus). In The Birds of North America, No. 259 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists' Union, Washington, D.C. Some cormorant, pelican, gull and tern species have individuals that never visit the sea at all, spending their lives on lakes, rivers, swamps and, in the case of some of the gulls, cities and agricultural land. In these cases it is thought that these terrestrial or freshwater birds evolved from marine ancestors. Some seabirds, principally those that nest in tundra-like skuas and phalaropes, will migrate over land as well.
The more marine species, such as petrels, auks, and gannets, are more restricted in their habits, but are occasionally seen inland as vagrants. This most commonly happens to young inexperienced birds, but can happen in great numbers to exhausted adults after large storms, an event known as a wreck,Harris, M. -anddocsymbol- Wanless, S., (1996) "Differential responses of Guillemot Uria aalge and Shag Phalacrocorax aristotelis to a late winter wreck" Bird Study 43(2): 220–230 where they provide prized sightings for birders.

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<section id="14300" fatherid="0" title="Relationship with humans" lv="" priority="5" level="1">
<section id="14301" fatherid="14300" title="Seabirds and fisheries" lv="" priority="1" level="2">
Seabirds have had a long association with both fisheries and sailors, and both have drawn benefits and disadvantages from the relationship.
Fishermen have traditionally used seabirds as indicators of both fish shoals, underwater banks that might indicate fish stocks, and of potential landfall. In fact, the known association of seabirds with land was instrumental in allowing the Polynesians to locate tiny landmasses in the Pacific. Seabirds have provided food for fishermen away from home, as well as bait. Famously, tethered cormorants have been used to catch fish directly. Indirectly, fisheries have also benefited from guano from colonies of seabirds acting as fertilizer for the surrounding seas.
Negative effects on fisheries are mostly restricted to raiding by birds on aquaculture,Collis, K., Adamany, S. - Columbia River Inter-Tribal Fish Commission, Roby, D.D., Craig, D.P., Lyons, D.E., - Oregon Cooperative Fish and Wildlife Research Unit, (2000), "Avian Predation on Juvenile Salmonids in the Lower Columbia River", 1998 Annual Report to Bonneville Power Administration, Portland, OR,  although long-lining fisheries also have to deal with bait stealing. There have been claims of prey depletion by seabirds of fishery stocks, and while there is some  evidence of this, the effects of seabirds are considered smaller than that of marine mammals and predatory fish (like tuna).
Fisheries also have negative effects on seabirds, and these effects, particularly on the long-lived and slow-breeding albatrosses, are a source of increasing concern to conservationists. The bycatch of seabirds entangled in nets or hooked on fishing lines has had a big impact on seabird numbers; for example, an estimated 100,000 albatrosses are hooked and drown each year on tuna lines set out by long-line fisheries.BirdLife International/RSPB (2005) Save the Albatross: The Problem Retrieved March 17, 2006Brothers NP. 1991. "Albatross mortality and associated bait loss in the Japanese longline fishery in the southern ocean." Biological Conservation 55: 255–268. Overall, many hundreds of thousands of birds are trapped and killed each year, a source of concern for some of the rarest species (for example, only 1,000 Short-tailed Albatrosses are known to still exist). Seabirds are also thought to suffer when overfishing occurs.

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<section id="14302" fatherid="14300" title="Exploitation" lv="" priority="2" level="2">
The hunting of seabirds and the collecting of seabird eggs have contributed to the declines of many species, and the extinction of several, including the Great Auk and the Spectacled Cormorant. Seabirds have been hunted for food by coastal peoples throughout history—one of the earliest instances known is in southern Chile, where archaeological excavations in middens has shown hunting of albatrosses, cormorants and shearwaters from 5000 BP.Simeone, A. -anddocsymbol- Navarro, X. (2002) "Human exploitation of seabirds in coastal southern Chile during the mid-Holocene" Rev. chil. hist. nat 75(2): 423–431   This pressure has led to some species becoming extinct in many places; in particular, at least 20 species of an original 29 no longer breed on Easter Island. In the 19th century, the hunting of seabirds for fat deposits and feathers for the millinery trade reached industrial levels. Muttonbirding (harvesting shearwater chicks) developed as important industries in both New Zealand and Tasmania, and the name of one species, the Providence Petrel, is derived from its seemingly miraculous arrival on Norfolk Island where it provided a windfall for starving European settlers.Anderson, A. (1996) "Origins of Procellariidae Hunting in the Southwest Pacific" International Journal of Osteoarcheology 6: 403–410 In the Falkland Islands, hundreds of thousands of penguins were harvested for their oil each year. Seabird eggs have also long been an important source of food for sailors undertaking long sea voyages, as well as being taken when settlements grow in areas near a colony. Eggers from San Francisco took almost half a million eggs a year from the Farallon Islands in the mid-19th century, a period in the islands' history from which the seabird species are still recovering.White, Peter; (1995), The Farallon Islands, Sentinels of the Golden Gate, Scottwall Associates:San Francisco, ISBN 0-942087-10-0
Both hunting and egging continue today, although not at the levels that occurred in the past, and generally in a more controlled manner. For example, the Māori of Stewart Island/Rakiura continue to harvest the chicks of the Sooty Shearwater as they have done for centuries, using traditional methods (called kaitiakitanga) to manage the harvest, but now work with the University of Otago in studying the populations. In Greenland, however, uncontrolled hunting is pushing many species into steep decline.Burnham, W., Burnham, K.K., Cade, T.J., (2005) "Past and present assessments of bird life in Uummannaq District, West Greenland" Dansk Orn. Foren. Tidsskr. 99: 196–208

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<section id="14303" fatherid="14300" title="Other threats" lv="" priority="-3" level="2">
Other human factors have led to declines and even extinctions in seabird populations, colonies and species. Of these, perhaps the most serious are introduced species. Seabirds, breeding predominantly on small isolated islands, have lost many predator defence behaviours. Feral cats are capable of taking seabirds as large as albatrosses, and many introduced rodents, such as the Pacific Rat, can take eggs hidden in burrows. Introduced goats, cattle, rabbits and other herbivores can lead to problems, particularly when species need vegetation to protect or shade their young.Carlile, N., Proiddel, D., Zino, F., Natividad, C. -anddocsymbol- Wingate, D.B. (2003) "A review of four successful recovery programmes for threatened sub-tropical petrels" Marine Ornithology 31: 185–192 Disturbance of breeding colonies by humans is often a problem as well—visitors, even well-meaning tourists, can flush brooding adults off a colony leaving chicks and eggs vulnerable to predators.
The build-up of toxins and pollutants in seabirds is also a concern. Seabirds, being apex predators, suffered from the ravages of DDT until it was banned; among other effects, DDT was implicated in embryo development problems and the skewed sex ratio of Western Gulls in southern California.Fry, D. -anddocsymbol- Toone, C. (1981) "DDT-induced feminization of gull embryos" Science 213(4510): 922–924 Oil spills are also a threat to seabird species, as both a toxin and because the feathers of the birds become saturated by the oil, causing them to lose their waterproofing.Dunnet, G., Crisp, D., Conan, G., Bourne, W. (1982) "Oil Pollution and Seabird Populations and Discussion" Philosophical Transactions of the Royal Society of London. B 297(1087): 413–427 Oil pollution threatens species with restricted ranges or already depressed populations.

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<section id="14304" fatherid="14300" title="Conservation" lv="" priority="4" level="2">
The threats faced by seabirds have not gone unnoticed by scientists or the conservation movement. As early as 1903, U.S. President Theodore Roosevelt was convinced of the need to declare Pelican Island in Florida a National Wildlife Refuge to protect the bird colonies (including the nesting Brown Pelicans),USFWS Pelican Island National Wildlife Refuge History of Pelican Island Retrieved September 2 2006 and in 1909 he protected the Farallon Islands. Today many important seabird colonies are given some measure of protection, from Heron Island in Australia to Triangle Island in British Columbia.
Island restoration techniques, pioneered by New Zealand, enable the removal of exotic invaders from increasingly large islands. Feral cats have been removed from Ascension Island, Arctic Foxes from many islands in the Aleutian Islands,Williams, J.C., Byrd G.V.-anddocsymbol- Konyukhov, N.B. (2003) "Whiskered Auklets Aethia pygmaea, foxes, humans and how to  a wrong." Marine Ornithology 31: 175–180   and rats from Campbell Island. The removal of these introduced species has led to increases in numbers of species under pressure and even the return of extirpated ones. After the removal of cats from Ascension Island, seabirds began to nest there again for the first time in over a hundred years.BirdLife International (2005) Stamps celebrate seabird return. Retrieved August 12 2006
Seabird mortality caused by long-line fisheries can be greatly reduced by techniques such as setting long-line bait at night, dying the bait blue, setting the bait underwater, increasing the amount of weight on lines and by using bird scarers,Food and Agriculture Organisation (1999) "The incidental catch of seabirds by longline fisheries: worldwide review and technical guidelines for mitigation. FAO Fisheries Circular No.937. Food and Agriculture Organization of the United Nations, Rome.   and their deployment is increasingly required by many national fishing fleets. The international ban on the use of drift nets has also helped reduce the mortality of seabirds and other marine wildlife.
One of the Millennium Projects in the UK was the Scottish Seabird Centre, near the important bird sanctuaries on Bass Rock, Fidra and the surrounding islands. The area is home to huge colonies of gannets, puffins, skuas and other seabirds. The centre allows visitors to watch live video from the islands as well as learn about the threats the birds face and how we can protect them, and has helped to significantly raise the profile of seabird conservation in the UK. Seabird tourism can provide income for coastal communities as well as raise the profile of seabird conservation. For example, the Northern Royal Albatross colony at Taiaroa Head in New Zealand attracts 40,000 visitors a year.
The plight of albatross and large seabirds, as well as other marine creatures, being taken as bycatch by long-line fisheries, has been addressed by a large number of non-governmental organizations (including BirdLife International, the American Bird Conservancy, and the Royal Society for the Protection of Birds). This led to the Agreement on the Conservation of Albatrosses and Petrels, a legally binding treaty designed to protect these threatened species, which has been ratified by eleven countries as of 2008 (namely Argentina, Australia, Chile, Ecuador, France, New Zealand, Norway, Peru, South Africa, Spain, and the United Kingdom).Australian Antarctic Division Agreement on the Conservation of Albatrosses and Petrels Site Retrieved April 8 2008

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<section id="14305" fatherid="14300" title="Role in culture" lv="" priority="-5" level="2">
Many seabirds are little studied and poorly known, due to living far out to sea and breeding in isolated colonies.  However, some seabirds, particularly, the albatrosses and gulls, have broken into popular consciousness.  The albatrosses have been described as "the most legendary of birds",Carboneras, C. (1992) "Family Diomedeidae (Albatrosses)" in Handbook of Birds of the World Vol 1. Barcelona:Lynx Edicions, ISBN 84-87334-10-5 and have a variety of myths and legends associated with them, and today it is widely considered unlucky to harm them, although the notion that sailors believed that is a mythCocker, M., -anddocsymbol- Mabey, R., (2005) Birds Britannica London:Chatto -anddocsymbol- Windus, ISBN 0-7011-6907-9 which derives from Samuel Taylor Coleridge's famous poem, "The Rime of the Ancient Mariner", in which a sailor is punished for killing an albatross by having to wear its corpse around his neck.
Instead of the Cross the Albatross
About my neck was hung
Sailors did, however, consider it unlucky to touch a storm-petrel, especially one that has landed on the ship.Carboneras, C. (1992) "Family Hydrobatidae (Storm-petrels)" in Handbook of Birds of the World Vol 1. Barcelona:Lynx Edicions, ISBN 84-87334-10-5
Gulls are one of the most commonly seen seabirds, given their use of human-made habitats (such as cities and dumps) and their often fearless nature. They therefore also have made it into the popular consciousness - they have been used metaphorically, as in Jonathan Livingston Seagull by Richard Bach, or to denote a closeness to the sea, such as their use in the The Lord of the Rings both in the insignia of Gondor and therefore Númenor (used in the design of the films), and to call Legolas to (and across) the sea. Other species have also made an impact; pelicans have long been associated with mercy and altruism because of an early Western Christian myth that they split open their breast to feed their starving chicks.

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<section id="14306" fatherid="0" title="Seabird families" lv="" priority="6" level="1">
The following are the groups of birds normally classed as seabirds.
Sphenisciformes (Antarctic and southern waters; 16 species)
Procellariiformes  (Tubenoses: pan-oceanic and pelagic; 93 species)
Pelecaniformes (Worldwide; 57 species)
Charadriiformes (Worldwide; 305 species, but only the families listed are classed as seabirds.)
For an alternative taxonomy of these groups, see also Sibley-Ahlquist taxonomy.

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<section id="14307" fatherid="0" title="References" lv="" priority="-7" level="1">
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<section id="14308" fatherid="0" title="External links" lv="" priority="-8" level="1">
zh-classical:海鳥
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