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A lack of crowding? Body size does not decrease with density for two behavior-manipulating parasites.

Kelly L Weinersmith1, Chloe B Warinner2, Virginia Tan2

  • 1*Graduate Group in Ecology, Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA; Dos Pueblos High School, Goleta, CA 93117, USA; Harvard College, Cambridge, MA 02138, USA; Irvington High School, Fremont, CA 94538, USA; University of Chicago, Chicago, IL 60637, USA; Population Biology Graduate Group, Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA; Department of Biology, University of California, Riverside, CA 92507, USA; **Department of Ecology, Evolution, and Marine Biology and Marine Science Institute, University of California, Santa Barbara, CA 93106, USA; Western Ecological Research Center, US Geological Survey, Santa Barbara, CA 93106, USA KLSmit@UCDavis.edu.

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This summary is machine-generated.

Resource competition in manipulative parasites depends on host size and infection intensity. This study found no negative density-dependence in small parasites, suggesting resources are not limiting and may even benefit crowded parasites.

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Area of Science:

  • Ecology
  • Parasitology
  • Evolutionary Biology

Background:

  • Trophically transmitted parasites often manipulate host phenotypes, but resource competition dynamics are poorly understood.
  • Theoretical models predict negative, positive, or no density-dependence, yet most studies report negative density-dependence.
  • This trend may stem from a focus on large parasites relative to hosts, potentially overlooking systems with small parasites.

Purpose of the Study:

  • To investigate density-dependence in two small, manipulative trematode parasites, Euhaplorchis californiensis (EUHA) and Renicola buchanani (RENB), infecting California killifish.
  • To determine if parasite size relative to host influences resource competition and density-dependence.
  • To explore the implications of parasite-host interactions for parasite fitness and transmission.

Main Methods:

  • Examined density-dependence in wild-caught California killifish infected with EUHA and RENB.
  • Assessed parasite size relative to host size to infer potential resource limitation.
  • Analyzed parasite-intensity-dependent behavioral changes in hosts and their impact on predation rates by the final host.

Main Results:

  • No negative density-dependence was observed for either EUHA or RENB, indicating resources are not limiting for these small parasites.
  • Observed patterns suggest potential mild positive density-dependence for EUHA.
  • Parasite intensity correlated with host behavioral changes that increase predation risk by the shared final host.

Conclusions:

  • Small, behavior-manipulating parasites may not experience resource limitation, challenging the common observation of negative density-dependence.
  • Parasite crowding may not reduce individual parasite size and could potentially be beneficial.
  • Further experimental studies are needed to confirm these findings and elucidate the mechanisms driving density-dependence in manipulative parasites.