Levels of inbreeding depression over seven generations of selfing in the androdioecious clam shrimp, Eulimnadia texana.

Abstract:

:Androdioecy (mixtures of males and hermaphrodites) is a rare mating system in both plants and animals. Theory suggests that high levels of inbreeding depression can maintain males in androdioecious populations if hermaphrodites commonly self-fertilize. However, if inbreeding depression (delta) can be 'purged' from selfing populations, maintaining males is more difficult. In the androdioecious clam shrimp, Eulimnadia texana, delta is estimated to be as high as 0.7. Previous work suggests that this high level is maintained in the face of high levels of inbreeding due to an associative overdominance of fitness-related loci with the sex-determining locus. Such associative overdominance would make purging of inbreeding depression difficult to impossible. The current experiment was designed to determine if delta can be purged in these shrimp by tracking fitness across seven generations in selfing and outcrossing treatments. Evidence of purging was found in one of four populations, but the remaining populations demonstrated a consistent pattern of delta across generations. Although the experimental design allowed ample opportunity for purging, the majority of populations were unable to purge their genetic load. Therefore, delta in this species is likely due to associative overdominance caused by deleterious recessive alleles linked to the sex determining locus.

journal_name

J Evol Biol

authors

Weeks SC

doi

10.1111/j.1420-9101.2004.00712.x

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

475-84

issue

3

eissn

1010-061X

issn

1420-9101

pii

JEB712

journal_volume

17

pub_type

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