Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für Evolutionsbiologie     Collection: Ecophysiology     Display Documents

ID: 121892.0, MPI für Evolutionsbiologie / Ecophysiology
Depth selection behavior, fish kairomones, and the life histories of Daphnia hyalina x galeata hybrid clones.
Authors:de Meester, Luc; Weider, Lawrence J.
Date of Publication (YYYY-MM-DD):1999-07
Title of Journal:Limnology and Oceanography
Journal Abbrev.:Limnol. Oceanogr.
Issue / Number:5
Start Page:1248
End Page:1258
Copyright:Jahrbuch 2000, Copyright MPG 2000
Review Status:not specified
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We studied life-history characteristics of 22 genetically distinct Daphnia hyalina X galeata clonal lineages isolated from samples taken at different depths in the Scohsee Lake (Germany) in the presence and absence of fish kairomones. substantial genetic variability was observed for all traits investigated. The presence of fish kairomones had a significant effect on all traits except relative length of the tail spine and age at maturity. All genotypes (clones) had. significantly smaller size at maturity and produced smaller offspring in the presence of fish kairomones, an observation that is consistent with the hypothesis of an adaptive response. Overall, reproductive output was less for fish-induced animals, but the effect was relatively small for the size of the first clutch and for the intrinsic rate of increase compared to the differences observed for size of the second and subsequent clutches. Adult body size was related to habitat selection behavior. Clones established from animals that were caught in the epilimnion during the day and early in the evening (termed "risk-tolerant" [RT] depth selection behavior) were found to be smaller, both in the absence and presence of fish kairomones, than clones isolated from the hypolimnion (termed "risk-averse" [RA] depth selection behavior). This relationship suggests a coadaptation between size-related life-history traits and habitat selection (depth selection) in zooplankton. There were no significant differences in the shifts in life-history characteristics between clones exhibiting RT and RA depth selection behavior in response to the presence of fish kairomones.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Ökophysiologie
External Affiliations:Katholieke Univ Leuven, Aquat Ecol Lab, B-3000 Louvain, Belgium
Identifiers:ISSN:0024-3590 [ID-No:1]
LOCALID:1780/S 37425 [Listen-Nummer/S-Nummer]
Full Text:
Sorry, no privileges
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.