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Filtering by: Subject Brandt's cormorant -- Columbia River Estuary (Or. and Wash.) Decade 2000-2009

Factors affecting colony size, reproductive success, and foraging patterns of double-crested cormorants nesting on East Sand Island in the Columbia River Estuary

Creator:

Anderson, Cynthia D.

Abstract:

The purpose of this study was to investigate the primary factors affecting colony size, reproductive success, and foraging patterns of Double-crested Cormorants (Phalacrocorax auritus albociliatus) nesting at East Sand Island in the Columbia River estuary, the largest colony of this species on the Pacific Coast of North America. This colony...

Resource Type:

Masters Thesis

Full Text:

salmonids in the Columbia River estuary, there was a need to understand the factors limiting the size and
Foraging ecology of caspian terns and double-crested cormorants in the Columbia River Estuary

Creator:

Lyons, Donald E.

Abstract:

A detailed understanding of the foraging ecology of species preying upon threatened or endangered prey may contribute to identifying and evaluating management options to reduce predation, when such management is deemed appropriate. In the Columbia River estuary, Caspian terns (Sterna caspia) and double-crested cormorants (Phalacrocorax auritus) have been identified as...

Resource Type:

Masters Thesis

Full Text:

sites with and without pile dikes and/or pilings in the Columbia River estuary. Boxplots show 25th 50th