Capturing breeding adults of colonially nesting species can entail risks of nest failure and even colony abandonment, especially in species that react strongly to human disturbance. A low-disturbance technique for capturing specific adult Double-crested Cormorants (Phalacrocorax auritus) at a ground-nesting colony was developed to reduce these risks and is described...
At the Siuslaw Estuary or some adjacent areas, U. S. Fish and Wildlife Service (USFWS) Biologists John Annear, John Cornely, and Roy Lowe conducted 67 censuses; Maureen Woolington made 90 censuses, and Range Bayer completed 429 censuses. Unfortunately, these censuses do not give a complete picture of the seasonality, abundance,...
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TWO INCIDENTAL OBSERVATIONS OF WATERBIRDS AT VALSETZ LAKE, POLK COUNTY
Seven species of water-dependent birds (northern phalarope,
Phalaropus lobatus; American avocet, Recurvirostra americana; Wilson's
phalarope, P. tricolor; eared grebe, Podiceps nigricollis;
ring-billed gull Larus delawarensis; California gull, L.
californicus; and northern shoveler, Anas clypeata) were studied
during the fall migrations of 1982 and 1983 to determine the diets and
foraging...
Colony size, nesting ecology and diet of Caspian Terns (Hydroprogne caspia) were investigated in the San Francisco Bay area (SFBA) during 2003-2009 to assess the potential for conservation of the tern breeding population and possible negative effects of predation on survival of juvenile salmonids (Oncorhynchus spp.). Numbers of breeding Caspian...
Double-crested Cormorants (Phalacrocorax auritus) have used central New York waters for breeding and stopover habitats during migration since 1984. In response to public concern over Oneida Lake, the United States Department of Agriculture Wildlife Services and the New York State Department of Environmental Conservation initiated an integrated research, management and...
From 25 April through 30 October 1992, I conducted 14 waterbird and raptor censuses at Cabell Marsh. I observed 33 waterbird taxa and seven raptor species, including hatch-year individuals of five waterbird species. The records for each census are given.
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1992 WATERBIRD AND RAPTOR RECORDS FOR CABELL MARSH, WILLIAM L. FINLEY NATIONAL WILDLIFE REFUGE,
BENTON
In 1984-1986, Bayer made 171 and 67 waterbird censuses at West Pond and East Pond, respectively. From 1974 through June 1992, Bayer and others also made an additional 138 and 110 observations at West Pond and East Pond, respectively. A total of 48 waterbird taxa were reported at West Pond,...
Mangroves provide numerous ecosystem services, including biodiversity values such as nesting sites for piscivorous waterbirds. High concentrations of pisicivoirous birds are hypothesized to affect ecosystem dynamics, yet few studies have examined their effects in mangroves. We examined the effects of nutrient enrichment by colonial waterbirds at a mangrove rookery in...
This article is based on a total of 353 observations, many of which were systematic censuses.
At West Beaver Pond, Llewellyn made 225 observations of waterbirds during 1982-June 1993. He noted a total of 19 taxa; 53% were seen in five or more of the 10 years with many observations....
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WATERBIRDS AT PONDS AND FIELDS IN THE SILETZ/LOGSDEN AREA OF LINCOLN COUNTY
Bob Llewellyn, 1821 Moonshine
