Oecologia

, Volume 173, Issue 4, pp 1237–1247 | Cite as

Mechanisms driving the density–area relationship in a saproxylic beetle

  • Heather B. Jackson
  • Amanuel Zeccarias
  • James T. Cronin
Population ecology - Original research

Abstract

Mechanisms underlying density–area relationships (correlations between population density and patch size) have rarely been tested experimentally. It is often assumed that higher density on large patches is evidence that large patches are high quality (i.e. have greater survival and reproduction), but the same pattern could result from disproportionate movement from small to large patches. Movement-based and within-patch processes must be experimentally separated to show that large patches are indeed of higher quality, but few studies have done so. We experimentally tested movement-based and within-patch hypotheses to explain the positive density–area relationship observed for a saproxylic (decayed wood-dependent) beetle, Odontotaenius disjunctus Illiger (Coleoptera: Passalidae). In separate experiments we quantified (1) immigration into and (2) finite growth rate within logs (=patches) that varied in size and density of conspecific beetles. A log was 11.7-fold [95 % confidence interval (CI) 3.4–40.8) and 10.5-fold (95 % CI 2.7–40.9) more likely to contain a new immigrant if it was large or contained a conspecific pair of beetles, respectively. Neither log size nor conspecific density was associated with changes in finite growth rate that would lead to higher density: decreased log size and increased conspecific density reduced finite growth rate in direct proportion to the loss in available resources per mating pair. We conclude that movement behavior rather than habitat quality is responsible for the positive density–area relationship for O. disjunctus. An important implication of our results is that population density is an imperfect indicator of habitat quality.

Keywords

Patch size effect Habitat selection Allee effect Aggregation Social information 

Notes

Acknowledgments

We would like to thank Amanda K. Accamando, Forrest Dillemuth, and Erick Reitschier for valuable field assistance. We are indebted to Louisiana State University for the use of its property. This work was supported by the Louisiana State University and National Science Foundation Grants DEB-0211359 and DEB-0515764 (and three REU Supplements) to J.T.C., a Louisiana State University Board of Regents Fellowship, two Louisiana State University BioGrads Awards, two Sigma Xi Grants-in-Aid of Research, and the American Natural History Museum’s Theodore Roosevelt Memorial Fund to H.B.J.

Supplementary material

442_2013_2697_MOESM1_ESM.pdf (260 kb)
Supplementary material 1 (PDF 260 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Heather B. Jackson
    • 1
    • 2
  • Amanuel Zeccarias
    • 1
  • James T. Cronin
    • 1
  1. 1.Department of Biological SciencesLouisiana State UniversityBaton RougeUSA
  2. 2.Geomatics and Landscape Ecology LaboratoryCarleton UniversityOttawaCanada

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