Department of Biology

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Peter Funch

Population dynamics of American horseshoe crabs—historic climatic events and recent anthropogenic pressures

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  • Søren Faurby, Denmark
  • Tim L. King, U.S. Geological Survey—Biological Resources Division, United States
  • Matthias Obst, University of Gothenburg, Sweden
  • Eric M. Hallerman, Virginia Polytechnic Institute and State University, United States
  • Cino Pertoldi, Denmark
  • Peter Funch
  • Department of Biological Sciences, Genetics and Ecology
Populations of the American horseshoe crab, Limulus polyphemus, have declined, but neither the causes nor the magnitude are fully understood. In order to evaluate historic demography, variation at 12 microsatellite DNA loci surveyed in 1218 L. polyphemus sampled from 28 localities was analysed with Bayesian coalescent-based methods. The analysis showed strong declines in population sizes throughout the species’ distribution except in the geographically isolated southern-most population in Mexico, where a strong increase in population size was inferred. Analyses suggested that demographic changes in the core of the distribution occurred in association with the recolonization after the Ice Age and also by anthropogenic effects, such as the past overharvest of the
species for fertilizer or the current use of the animals as bait for American eel (Anguilla rostrata) and whelk (Busycon spp.) fisheries. This study highlights the importance of considering both climatic changes and anthropogenic effects in efforts to understand population dynamics—a topic which is highly relevant in the ongoing assessments of the
effects of climate change and overharvest.
Original languageEnglish
JournalMolecular Ecology
Pages (from-to)3088–3100
Publication statusPublished - 2010

    Research areas

  • horseshoe crabs, Limulus, over-harvest, population decline, population dynamics

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