Earthplatform.com

Airborne animal species on seas

Earth Platform > Animals > Birds > Seabirds
 

Seabirds

The threats to seabirds were; being killed for meat, eggs and feathers. Today, modification of breeding habitats, oil spills and introduced feral animals are among the threats that can impact considerably on seabird populations. More recently, the global expansion of longline fisheries has begun to pose the greatest overall threat to seabirds.

Oiled birdLongline fishing is a method used to target finfish and shark species. A longline consists of a main line with numerous baited hooks attached to branchlines. The line can be set parallel to the surface or on the sea-bed. The number and type of hooks and the length of the branchlines, depend on the target species. Longlines can be up to 100 km long and have up to 10.000 hooks. Each year, thousands of seabirds are accidentally killed on longline hooks when birds ingest baited hooks during the setting or hauling of the longline. Birds hooked are subsequently pulled under the water by the weight of the line and drown. The level of mortality that occurs in longline fisheries, is not sustainable for many populations of seabirds.

However, this threat can be greatly minimised by modifying fishing practice and adopting seabird by-catch mitigation measures. These include the use of bird-scaring lines and streamers, weighted lines to reduce the amount of time baits are available to birds, setting lines at night, setting lines beneath the waters surface, and seasonal closures of fisheries to avoid fishing when birds are more susceptible to being caught, such as around nesting colonies during the breeding season. Adoption of these measures has now virtually eliminated seabird by-catch in some fisheries.

 

More about:

Habitat loss and degradation are threats African birds have to deal with.
Air pollution and human activities are the threats birds have to deal with in America.
The majority of Asian birds lives in forrests. These forrests are threatened by conversion to other land-uses and overexploitation. Therefor the birds are threatened by the same dangers.
Carrabean birds are threatened by erosion of pristine habitats and illegal trade of the birds.
Hunting and economic development are the majority of the causes that lead to death of birds in Europe.
On the pacific, habitat destruction and 'invasive alien species' are the larges threats.

News about airborne animal species

Birds News -- ScienceDaily

Scientists find the first bird beak, right under their noses - Researchers have pieced together the three-dimensional skull of an iconic, toothed bird that represents a pivotal moment in the transition from dinosaurs to modern-day birds.
Are emperor penguins eating enough? - For emperor penguins waddling around a warming Antarctic, diminishing sea ice means less fish to eat. How the diets of these tuxedoed birds will hold up in the face of climate change is a big question scientists are grappling with.
Rethinking the umbrella species concept - According to the 'umbrella species' concept, preserving and managing habitat for a single high-profile species also benefits a whole suite of other species that share its habitat -- but how well does this really work? Not all species that share the same general habitat necessarily have the same specific needs, and a new study from The Condor: Ornithological Applications finds that habitat management to benefit greater-sage grouse in Wyoming can actually harm some of its songbird neighbors.