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Diversified Bet-Hedging as a Reproductive Strategy of Some Ephemeral Pool Anostracans (Branchiopoda)

Diversified Bet-Hedging as a Reproductive Strategy of Some Ephemeral Pool Anostracans (Branchiopoda) AbstractIn California, most anostracan crustaceans inhabit ephemeral wetlands, such as vernal pools, mountain meadows, and desert playas with biphasic wet/dry cycles. The shrimps hatch and mature during the aquatic phase and deposit dormant cysts which remain in the soil through the dry phase. In some habitats, due to the variable nature of local rainfall patterns, pools at times fill only partially and dry quickly before the shrimp are able to mature and reproduce. Species in such unpredictable environments produce cysts that do not all hatch when first hydrated. A portion remain dormant and hatch in later pool fillings. We investigated the hatching pattern of two newly described species of anostracans found in unpredictable vernal pools in southern California, U.S.A., Branchinecta sandiegonensis Fugate and Streptocephalus woottoni Eng et al. Hatching rates for these species were among the lowest yet reported for anostracans. Initial hatch from the soil cyst bank was 6% for B. sandiegonensis and 0.18% for S. woottoni and cumulative totals were 28% and 2.8%, respectively, over 3 hydrations. Furthermore, hatching variability was demonstrated for the cysts of single pairs. This life-history pattern conforms to the 3 major predictions of models of diversified risk-spreading or bet-hedging strategies as developed for annual plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Crustacean Biology Oxford University Press

Diversified Bet-Hedging as a Reproductive Strategy of Some Ephemeral Pool Anostracans (Branchiopoda)

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References (20)

Publisher
Oxford University Press
Copyright
Copyright 1997 by Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0278-0372
eISSN
1937-240X
DOI
10.1163/193724097X00070
Publisher site
See Article on Publisher Site

Abstract

AbstractIn California, most anostracan crustaceans inhabit ephemeral wetlands, such as vernal pools, mountain meadows, and desert playas with biphasic wet/dry cycles. The shrimps hatch and mature during the aquatic phase and deposit dormant cysts which remain in the soil through the dry phase. In some habitats, due to the variable nature of local rainfall patterns, pools at times fill only partially and dry quickly before the shrimp are able to mature and reproduce. Species in such unpredictable environments produce cysts that do not all hatch when first hydrated. A portion remain dormant and hatch in later pool fillings. We investigated the hatching pattern of two newly described species of anostracans found in unpredictable vernal pools in southern California, U.S.A., Branchinecta sandiegonensis Fugate and Streptocephalus woottoni Eng et al. Hatching rates for these species were among the lowest yet reported for anostracans. Initial hatch from the soil cyst bank was 6% for B. sandiegonensis and 0.18% for S. woottoni and cumulative totals were 28% and 2.8%, respectively, over 3 hydrations. Furthermore, hatching variability was demonstrated for the cysts of single pairs. This life-history pattern conforms to the 3 major predictions of models of diversified risk-spreading or bet-hedging strategies as developed for annual plants.

Journal

The Journal of Crustacean Biology – Oxford University Press

Published: Jan 1, 1997

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