2011年5月26日 · Gannet, Cape Gannet, injuries, kleptoparasitism, plunge-diving. Pelagic prey of seabirds are able to evade predation by. descending to depths beyond the reach of diving birds.

do risk injury or even death if they col-lide with other predators. Nearly one per cent of dives by gannets feeding in large flocks on the sardine run off the Eastern Cape result in underwater col-lisions, mainly with other gannets, but also with sharks and cetaceans. Gannets often call at sea, both while in flight and when resting on the surface.

(A) Gannet head and human hand-first impact follows the force-time relation of Eq. 3, which is captured by the dimensionless relation F ¯ = t − 2, plotted as the black dashed line. The prefactor in the force scale is defined as g(β) = tan 3 β for the …

2011年5月26日 · Plunge-diving is a highly successful strategy for dealing with the challenges confronting birds feeding on pelagic prey. We tested for evidence of fatal injuries due to collision between conspecifics in plunge-diving Australasian Gannets Morus serrator and Cape Gannets Morus capensis, respectively, by performing post-mortem examinations of carcasses recovered from New Zealand waters and ...

2012年3月9日 · They can die of fatal neck and head injuries from accidental collisions, Gabriel, an Argentinian scientist based in New Zealand, says. ... At Cape Kidnappers, where 10,000 breeding pairs dwell, the average gannet can fly up to 500km at an average 70km/h in a day to seek out shoals of small pilchards and anchovies.

showed the gannets had died from collision injuries. While this ratio ... Take your average gannet at Cape Kidnappers, where 10,000 of New Zealand’s 55,000 breeding pairs dwell. In order to eat ...

The Cape gannet (Morus capensis) is a large seabird of the gannet family, Sulidae.. They are easily identified by their large size, black and white plumage and distinctive yellow crown and hindneck. The pale blue bill is pointed with fine serrations near the tip; perhaps because of the depth and speed of the gannet's dive when fishing (depending on altitude, gannets hit …

suggest that high juvenile Cape Gannet mortality in 1983 may have resulted from the 1982-1983 warm-water event. We propose that annual rates of fledgling Cape Gannet mortality, manifested by band recoveries of Algoa Bay Cape Gan-nets, might prove to be an indicator of ab-normal marine conditions. Warm-water events in this area have occurred at ...

The streamlined body shape of the gannet helps to maintain its forward momentum underwater when plunge-diving. This missile-shape reduces drag through the water. Most fish are caught on the initial descent, when they rely on their speed and the element of surprise to catch their unsuspecting prey. Momentum from the dive propels the birds to ...

The Cape Gannet is a large and striking seabird with impressively long wings, capable of plunge-diving at high speed to catch fish. Cape Gannets are resident along the coast of ... What physical adaptations help a gannet prevent injury when diving into the water at high speed? (5) A: 1. Reinforced skull. 2. Specially adapted neck muscles.