NDLI: Nutrient and energy acquisition by harlequin ducks foraging for an exotic crab, Carcinus maenas, and a native crab, Hemigrapsus oregonensis

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Nutrient and energy acquisition by harlequin ducks foraging for an exotic crab, Carcinus maenas, and a native crab, Hemigrapsus oregonensis

Content Provider	Semantic Scholar
Author	Schafer, Allegra Michelle
Copyright Year	2008
Abstract	Title of Document: NUTRIENT AND ENERGY ACQUISITION BY HARLEQUIN DUCKS FORAGING FOR AN EXOTIC CRAB, CARCINUS MAENAS, AND A NATIVE CRAB, HEMIGRAPSUS OREGONENSIS Allegra Michelle Schafer, M.S., 2008 Directed By: Professor Mary Ann Ottinger, Department of Animal and Avian Sciences Changes in prey species availability can present energetic challenges to wintering western North American harlequin ducks (Histrionicus histrionicus). The goal of this study was to examine the feeding behavior of captive harlequins and compare energy and nutrient contents of native crab, Hemigrapsus oregonensis to invasive exotic crab, Carcinus maenas. Intake rate, gut retention time, and assimilation efficiency did not differ between crab species. Green crabs had significantly larger (P=0.0034) meat-to-carapace ratio, 79% greater (P=0.0168) fat, and 15% greater (P=0.0058) energy than yellow shore crabs. Yellow shore crabs required 130% more (P=0.0301) force for carapace failure. Gross energy intake rate and assimilable energy intake rate did not differ between crab species. Therefore, energetically and nutritionally, green crabs provide a viable food option to harlequins, if yellow shore crabs are not available. However, the potential impacts of green crabs as an invasive species must be considered within an overall ecological context. NUTRIENT AND ENERGY ACQUISITION BY HARLEQUIN DUCKS FORAGING FOR AN EXOTIC CRAB, CARCINUS MAENAS, AND A NATIVE CRAB, HEMIGRAPSUS OREGONENSIS
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://drum.lib.umd.edu/bitstream/handle/1903/8201/umi-umd-5397.pdf?isAllowed=y&sequence=1
Alternate Webpage(s)	https://drum.lib.umd.edu/bitstream/handle/1903/8201/umi-umd-5397.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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