The influence of weather, geography, and habitat on migrating raptors on Cape May peninsula

Article Abstract:

Physical factors such as wind direction and speed have little effect on the number of raptors on Cape May peninsula, New Jersey. The need to hunt and the need for suitable habitats influences the density of raptors. Densities are higher and extend to lower altitudes over habitats similar to those encountered during breeding and wintering seasons. Migratory raptors forage on migratory birds, fish, and insects that gather at the end of Cape May peninsula or in the offshore waters. A high proportion of the raptors are immature and inexperienced and the presence of similarly immature prey affects migration along the coast.

Environmental aspects, Habitats, Birds of prey, Raptors (Birds), Cape May, New Jersey

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Shorebird diet during spring migration stopover on Delaware Bay

Article Abstract:

In spring, Delaware Bay plays host to thousands of migrating shorebirds seeking food to fuel their migration to the Canadian breeding grounds. The stopover coincides with the spawning of the horseshoe crab. A new study investigates the changes in body mass of the birds and examines how much of their diet consists of horseshoe crab eggs. It is shown that body mass increased by 70-80% during the stopover period, with the bulk of the food consisting of horseshoe crab eggs. It is suggested that declines in horseshoe crab spawning could adversely affect migratory shorebirds.

Food and nutrition, Bird migration, Shore birds, Shorebirds, Spawning, Delaware Bay

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Effects of oiling on feeding behavior of Sanderlings and Semipalted Plovers in New Jersey

Article Abstract:

The effects of oiling on feeding behavior of Sanderlings and Semipalted Plovers in New Jersey were studied to prove that there are no differences in foraging behavior as a function of the degree of oiling birds. The study made use of a focal animal sampling technique. Results show that as the percentage of oil plumage increased, the time devoted for finding significantly decreased for both species. Interruptions on feeding patterns may be dangerous and might have significant effects on reproduction.

Evaluation, Plovers, Oil spills, Forage plants, Forage

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