Body size and survivorship in overwintering populations of Porcellio laevis (Isopoda

Oniscidea)

Scott Kight, M. Martinez, A. Merkulov

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Because female Porcellio laevis (Isopoda: Oniscidea) carry eggs and young manca in a ventral marsupium, fecundity and body size are positively correlated. We examined female body size in November and February, a period in which breeding does not occur and changes in body size are unlikely to be attributed to growth. Our results from two consecutive years revealed several general patterns. First, the sex-ratio of individuals collected with baited traps was extremely female-biased. Second, body size was significantly larger (as indicated by length of antennae and appendages) in samples collected during November than in those collected during February. Third, no same-month differences in body size were found between years, suggesting that differential mortality during the non-breeding season does not result in natural selection on body size. These results suggest that older (presumably senescent) females suffer increased mortality risk over the winter.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalEntomological News
Volume112
Issue number2
StatePublished - 1 Jan 2001

Fingerprint

Porcellio
overwintering
Isopoda
survivorship
body size
survival rate
mortality risk
appendages
natural selection
antennae
sex ratio
antenna
fecundity
traps
breeding
egg
mortality
winter

Cite this

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abstract = "Because female Porcellio laevis (Isopoda: Oniscidea) carry eggs and young manca in a ventral marsupium, fecundity and body size are positively correlated. We examined female body size in November and February, a period in which breeding does not occur and changes in body size are unlikely to be attributed to growth. Our results from two consecutive years revealed several general patterns. First, the sex-ratio of individuals collected with baited traps was extremely female-biased. Second, body size was significantly larger (as indicated by length of antennae and appendages) in samples collected during November than in those collected during February. Third, no same-month differences in body size were found between years, suggesting that differential mortality during the non-breeding season does not result in natural selection on body size. These results suggest that older (presumably senescent) females suffer increased mortality risk over the winter.",
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Body size and survivorship in overwintering populations of Porcellio laevis (Isopoda : Oniscidea). / Kight, Scott; Martinez, M.; Merkulov, A.

In: Entomological News, Vol. 112, No. 2, 01.01.2001, p. 112-118.

Research output: Contribution to journalArticleResearchpeer-review

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