The effects of acidification on life-history traits of the freshwater clam Musculium partumeium (Say, 1822) (Bivalvia:Pisidiidae)

D. J. Hornbach, D. L. Childers

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

This study examines the effects of acidification on growth, survivorship, and natality of the fingernail clam, Musculium partumeium. Six groups of newborn clams (parents), collected in either October (replicate 1) or January (replicate 2), and their offspring (F1) were maintained in river water kept at a pH of 3, 4, 5 or 6 with the addition of H2SO4. A control (no acid added) had an average pH near 7. Generally, growth and survivorship were poor in treatments of pH 3 and 4. Maximal growth occurred at a pH of 5, which approximates that of the stream from which these clams were collected. Also, clams maintained at a pH of 5 generally had the highest gross and net reproductive rates and the youngest age at first reproduction, leading to maximum values of r (intrinsic rate of increase) for clams maintained at pH 5. Usually the F1 generations had greater survivorship than their parents and under adverse conditions could attain greater shell lengths. Life-history traits in M. partumeium appear to be sensitive to changes in environmental pH and populations of these clams may be able to acclimate to changing pH regimes over time, i.e., from one generation to the next.

Original languageEnglish (US)
Pages (from-to)113-121
Number of pages9
JournalCanadian Journal of Zoology
Volume65
Issue number1
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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