Brennon (@00219) • Hey
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari.
Publications
- These temporal shifts from a marine to terrestrial prey highlight the resilience adult gulls have and their ability to keep chick condition consistent.
- The gulls relied substantially on the Henslow's swimming crab (Polybius henslowii). Yet, in times when local prey availability is low, the gulls shift to human-related food.
- Analyzing both adult and chick remains, researchers found a mixture of both natural prey and human refuse.
- Between the years of 1974–1994, yellow-legged gull populations in Berlenga Island, Portugal, increased from 2600 to 44,698 individuals.
- Lastly, closure of nearby open-air landfills limited food availability for the gulls, furthering creating a stress on their shift in diet.
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- This shift was linked to higher fishing efficiency and thus overall fish stock depletion.
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- Analysis of yellow-legged gull's (Larus michahellis) pellets off the northwest coast of Spain revealed a shift from a sardine to crustacean-based diet.
- Looking at the effect of humans on gull diet, overfishing of target prey such as sardines have caused a shift in diet and behavior.
- Examples of such associations include four species of gulls feeding around plumes of mud brought to the surface by feeding grey whales,and also between orcas (largest dolphin species) and kelp gulls (and other seabirds).
- To obtain prey from deeper down, many species of gulls feed in association with other animals, where marine hunters drive prey to the surface when hunting.
- Gulls have only a limited ability to dive below the water to feed on deeper prey.
- The time taken to learn foraging skills may explain the delayed maturation in gulls.
- While overall feeding success is a function of age, the diversity in both prey and feeding methods is not.
- as older birds are more successful than younger ones.
- Gulls may fly some distance to find a suitable surface on which to drop shells, and apparently a learned component to the task exists,
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- One method of obtaining prey involves dropping heavy shells of clams and mussels onto hard surfaces.
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- In shallow water gulls may also engage in foot paddling.
- Larger gulls tend to do more feeding in this way.
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- Food is also obtained by searching the ground, often on the shore among sand, mud or rocks.
- Dipping is also common when birds are sitting on the water, and gulls may swim in tight circles or foot paddle to bring marine invertebrates up to the surface.
- Again, smaller species are more manoeuvrable and better able to hover-dip fish from the air.
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- Gulls on the wing also snatch items both off water and off the ground, and over water they also plunge-dive to catch prey.
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- larger species perform this feat more rarely.
- In the air, a number of hooded species are able to hawk insects on the wing;
- Prey can be obtained in the air, on water, or on land.
- In addition to taking a wide range of prey, gulls display great versatility in how they obtain prey.
- and earthworms are more common during the breeding season while marine prey is more common in the nonbreeding season when birds spend more time on large bodies of water.
- The type of food depends on circumstances, and terrestrial prey such as seeds, fruit,
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- No gull species is a single-prey specialist, and no gull species forages using only a single method.
- rodents, eggs, carrion, offal, reptiles, amphibians, seeds, fruit, human refuse, and even other birds.
- terrestrial arthropods and invertebrates such as insects and earthworms;
- both alive and already dead;
- The food taken by gulls includes fish and marine and freshwater invertebrates,
- Gulls are highly adaptable feeders that opportunistically take a wide range of prey.
- as they possess exocrine glands located in supraorbital grooves of the skull by which salt can be excreted through the nostrils to assist the kidneys in maintaining electrolyte balance.
- Charadriiform birds drink salt water, as well as fresh water,
- Gulls in particular had high associations with salinity levels, being the main environmental predictor for waterbird assemblage.
- water body isolation and hydroperiod altered bird community structure in both a species and guild specific way.
- Looking at waterbird distribution in wetlands, changes in salinity, water depth,
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