Evol Ecol Res 4: 239-246 (2002) Full PDF if your library subscribes.
Shrimp adjust their sex ratio to fluctuating age distributions
Eric L. Charnov1,2 and Robert W. Hannah3
1Department of Biology, The University of New Mexico, Albuquerque, NM 87131 and 2Department of Zoology, Oregon State University, Corvallis, OR 97331 and 3Oregon Department of Fish and Wildlife, 2040 S.E. Marine Science Drive, Newport, OR 97365, USA
Long-term data sets that quantitatively confirm basic ecological theory are rare for field populations. Highly variable recruitment often causes wide temporal variation in population age distribution and basic theory for adaptive sex ratio often predicts ‘sex ratio tracking’ to match the fluctuating age distribution. Using sex-changing shrimp as a model system, we test this in a new data set of 20 years duration. The new data support the theory, despite intense fishery exploitation that itself has greatly altered the age distribution in recent years.
Keywords: evolutionarily stable strategy, fisheries, frequency dependence, protandry, recruitment variation.
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