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The life history, morphological, and behavioral changes of two Arctic daphnids to kairomone from the invertebrate predator Heterocope septentrionalis

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Melinda E. Burris (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/
Advisor
John O'Brien

Abstract: "In the Toolik Lake region of arctic Alaska, ponds contain one of two distinct zooplankton communities. Small ponds are typically dominated by Daphnia pulex and medium and large ponds are typically dominated by the larger daphnid, Daphnia middendorffiana. An invertebrate predator, Heterocope septentrionalis, exists in the medium and large ponds with D. middendorffiana. D. pulex were exposed to Heterocope kairomone in laboratory and in situ experiments in an effort to explain why these two species do not coexist in nature. An increase in average egg number per brood was observed when D. pulex were exposed to predator kairomone both in laboratory and in situ studies. In laboratory studies, D. pulex increased size at 24 hours old in response to Heterocope kairomone. Behavioral changes, such as an alternation in vertical position, were not observed when D. pulex and D. middendorffiana were exposed to predator kairomones."--Abstract from author supplied metadata.

Additional Information

Publication
Thesis
Language: English
Date: 2006
Keywords
Toolik Lake, arctic, Alaska, ponds, zooplankton, Daphnia pulex, Daphnia middendorffiana, invertebrate predator, Heterocope septentrionalis, D. middendorffiana
Subjects
Freshwater zooplankton--Arctic regions
Lake ecology--Arctic regions
Freshwater ecology--Alaska