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Resting eggs of lake‐Daphania II. In situ observations on the hatching of eggs and their contribution to population and community structure

Resting eggs of lake‐Daphania II. In situ observations on the hatching of eggs and their... SUMMARY. 1. To investigate the contribution of hatchlings from lake‐Daphnia resting eggs (ephippia) to population and community structure, hatching was monitored in situ from April to November 1986 in two north German lakes. Hatching traps were placed on the sediments and the incidence, genetic and species composition of ephippial hatchlings determined twice‐weekly. 2. Hatching began in April after the thawing of ice. and continued for 3–4 weeks until the lakes stratified. There was no obvious relationship between the onset and duration of hatching and the environmental variables recorded, namely Secchi depth, surface temperature, temperature and oxygen concentration at the sediment‐water interface. 3. Among the hatchlings were D. galeata, D. hyalina and their interspecific hybrid. 4. In the lake which contained overwintering animals the number of ephippial hatchlings was approximately one third of the total number of juveniles present in the lake. 5. In the second lake, no adults were recorded during winter and the population was probably founded by ephippial hatchlings alone. There was good agreement, in the short term, between the proportion of each species represented among hatchlings and the subsequent species composition in the lake. 6. The hatchlings were genetically diverse, and alleles were representative of those alleles present in contemporary populations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Freshwater Biology Wiley

Resting eggs of lake‐Daphania II. In situ observations on the hatching of eggs and their contribution to population and community structure

WOLF, HANS GEORG; CARVALHO, GARY R.
Freshwater Biology , Volume 22 (3) – Dec 1, 1989
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References (14)

Publisher
Wiley
Copyright
Copyright © 1989 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0046-5070
eISSN
1365-2427
DOI
10.1111/j.1365-2427.1989.tb01119.x
Publisher site
See Article on Publisher Site

Abstract

SUMMARY. 1. To investigate the contribution of hatchlings from lake‐Daphnia resting eggs (ephippia) to population and community structure, hatching was monitored in situ from April to November 1986 in two north German lakes. Hatching traps were placed on the sediments and the incidence, genetic and species composition of ephippial hatchlings determined twice‐weekly. 2. Hatching began in April after the thawing of ice. and continued for 3–4 weeks until the lakes stratified. There was no obvious relationship between the onset and duration of hatching and the environmental variables recorded, namely Secchi depth, surface temperature, temperature and oxygen concentration at the sediment‐water interface. 3. Among the hatchlings were D. galeata, D. hyalina and their interspecific hybrid. 4. In the lake which contained overwintering animals the number of ephippial hatchlings was approximately one third of the total number of juveniles present in the lake. 5. In the second lake, no adults were recorded during winter and the population was probably founded by ephippial hatchlings alone. There was good agreement, in the short term, between the proportion of each species represented among hatchlings and the subsequent species composition in the lake. 6. The hatchlings were genetically diverse, and alleles were representative of those alleles present in contemporary populations.

Journal

Freshwater Biology – Wiley

Published: Dec 1, 1989

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