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Full-Text Articles in Life Sciences
Shrimp Adjust Their Sex Ratio To Fluctuating Age Distributions, Eric Charnov, Robert Hannah
Shrimp Adjust Their Sex Ratio To Fluctuating Age Distributions, Eric Charnov, Robert Hannah
Biology Faculty & Staff Publications
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.
Dimensionless Invariants For The Optimal Size (Age) Of Sex Change, Eric Charnov, Unnur Skúladóttir
Dimensionless Invariants For The Optimal Size (Age) Of Sex Change, Eric Charnov, Unnur Skúladóttir
Biology Faculty & Staff Publications
Optimization models have been widely and successfully used in evolutionary ecology to predict the attributes of organisms; perhaps the greatest quantitative success is in the area of sex allocation (sex ratio, sperm versus eggs for hermaphrodites, time as a male [female] for a sex changer), where the fact of having only one mother and one father makes Darwinian fitness a simple product of gain-via-male times gain-via-female. Previous work on sex change used the maximization of this male—female product to successfully predict the direction and age (size) for sex change, and that age has been shown to imply a breeding sex …
Natural Selection And Sex Change In Pandalid Shrimp: Test Of A Life History Theory, Eric Charnov
Natural Selection And Sex Change In Pandalid Shrimp: Test Of A Life History Theory, Eric Charnov
Biology Faculty & Staff Publications
This article presents a graphical approach to the genetical theory of sex change (similar to one recently applied to the evolution of simultaneous hermaphroditism). The graphs will help clarify a set of predictions to be tested against data from Pandalid shrimp. These shrimp are protandrous hermaphrodites (reproduce first as males). The goal is to use the genetical theory to predict the age of sex change. Since these shrimp show much geographic variation in this age, they provide a good opportunity to test the evolutionary model.
The Genetical Evolution Of Patterns Of Sexuality: Darwinian Fitness., Eric Charnov
The Genetical Evolution Of Patterns Of Sexuality: Darwinian Fitness., Eric Charnov
Biology Faculty & Staff Publications
No abstract provided.