AGRIS

Data provider:

Icon data provider

The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Active (Data provider submitted metadata in the last calendar year)
Journal Article

Journal Article

Eating the Invaders: The Prevalence of Round Goby (Apollonia melanostomus) in the Diet of Double-Crested Cormorants on the Niagara River  [2012]

Coleman, Jeremy T. H.; Adams, Connie M.; Kandel, Mark; Richmond, Milo E.;

Access the full text

The Round Goby (Apollonia melanostomus) is a small benthic fish, native to the Eurasian Ponto-Caspian region, that has rapidly spread through the entire Laurentian Great Lakes system since its 1990 discovery in Lake St. Clair. Tolerant of high population densities, the exotic Round Goby competes aggressively with native fish for food and habitat, and has increasingly been exploited by endemic Great Lakes predators. A management program for the Upper Niagara River, initiated in 2004, has provided an opportunity to study the interactions between these invaders and the Double-crested Cormorant (Phalacrocoiax auritus), a native top predator. The gut contents of 1,119 cormorants nesting at two sites in the Upper Niagara River from 2004 to 2007 were examined, and the species composition of ingested prey (by number and weight) was quantified for the 600 stomachs that contained identifiable prey. Results of these analyses indicate that Round Goby can constitute up to 85% of the biomass in cormorant diet during periods of the breeding season, and that gobies are consumed by cormorants through all dates sampled (May through August). Lengths of Round Gobies recovered in the cormorant diet were skewed towards larger members of the goby population, suggesting non-random selection relative to the range of size possibilities, and displayed significant declines in length between and within seasons.
From the journal
Waterbirds
ISSN : 1524-4695

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
35
Issue:
sp1
Start Page:
103
End Page:
113
Publisher:
Waterbirds Society
All titles:
"Eating the Invaders: The Prevalence of Round Goby (Apollonia melanostomus) in the Diet of Double-Crested Cormorants on the Niagara River"@eng
Loading...

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2016
Volume:
35
Issue:
sp1
Start Page:
103
End Page:
113
Publisher:
Waterbirds Society
All titles:
"Eating the Invaders: The Prevalence of Round Goby (Apollonia melanostomus) in the Diet of Double-Crested Cormorants on the Niagara River"@eng