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Mate guarding in relation to seasonal changes in the energy reserves of two freshwater amphipods (Gammarus fossarumandG. pulex)

Authors :
Carola Winkelmann
Jochen Becker
Christian Ortmann
Jochen H. E. Koop
Markus A. Wetzel
Source :
Freshwater Biology. 58:372-381
Publication Year :
2012
Publisher :
Wiley, 2012.

Abstract

Summary 1. We assessed sex-specific seasonal changes in major energy storage compounds (triglycerides, glycogen) in Gammarus fossarum and Gammarus pulex collected from the field, with respect to their reproductive activity. 2. The dynamics of stored energy followed a seasonal pattern in both species and sexes. Moreover, over a 4-year period, these changes were independent of the year in which they were investigated. Stored energy reached a peak in late winter, but was depleted in late summer and early autumn, coinciding with the reproductive periods. 3. Triglyceride (annual mean ± SD) accounted for 79.7 ± 11.9% of the total stored energy and was responsible for the seasonal pattern. In contrast, glycogen contributed a lesser percentage (20.3 ± 11.9%). Over the study period, the amount of stored energy ranged between 0.39 and 4.08 kJ g−1 dry mass (triglyceride: 0.19–3.69 kJ g−1 dry mass; glycogen: 0.14–0.80 kJ g−1 dry mass). 4. In both species, the energy reserves of males were drastically depleted shortly before the cessation of precopulatory mate guarding in the field, thus offering a bioenergetic explanation for the reproductive period in these two widespread species.

Details

ISSN :
00465070
Volume :
58
Database :
OpenAIRE
Journal :
Freshwater Biology
Accession number :
edsair.doi...........48df0189bf1115eb2238348b9f1f74a6
Full Text :
https://doi.org/10.1111/fwb.12065