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Related Experiment Videos

Polymorphism promotes edge utilization by marsh crabs.

Benjamin J Toscano1, Domitilla Pulcini2, Raul Costa-Pereira3

  • 1Department of Biology, Trinity College, Hartford, CT, USA. benjamin.toscano@trincoll.edu.

Oecologia
|March 13, 2022
PubMed
Summary

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This summary is machine-generated.

Resource polymorphism in marsh crabs (Panopeus obesus) drives edge utilization. Edge crabs show distinct morphology and feeding adaptations, influencing estuarine food webs.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Marine Biology

Background:

  • Habitat edges significantly impact ecological processes due to landscape modifications.
  • Intraspecific resource use variation's role in mediating edge utilization is poorly understood.
  • Resource specialization influences species' responses to habitat edges.

Purpose of the Study:

  • To investigate how resource polymorphism in marsh crabs (Panopeus obesus) mediates foraging at marsh-oyster reef boundaries.
  • To understand the interplay between intraspecific variation, morphology, and prey utilization at habitat interfaces.
  • To explore the ecological consequences of resource polymorphism in estuarine predator guilds.

Main Methods:

  • Stomach content analysis to determine dietary differences between edge and core populations.
Keywords:
Edge effectsFood webIntraspecific variationNiche specializationPredation

Related Experiment Videos

  • Geometric morphometrics to quantify claw morphology variations.
  • Feeding experiments to assess prey capture efficiency based on crab phenotype and prey type.

    • Main Results:

    • Edge P. obesus consumed more defended bivalves and possessed more robust claws than core individuals.
    • Phenotypic plasticity in edge crabs enhanced feeding efficiency on small, but not large, prey.
    • Morphological and ecological traits of edge P. obesus overlapped with P. herbstii, indicating functional convergence.

    Conclusions:

    • Resource polymorphism is a key driver of habitat edge utilization in marsh crabs.
    • Phenotypic plasticity allows P. obesus to exploit edge resources, potentially subsidizing marsh food webs.
    • The study provides insights into niche differentiation and competition dynamics within estuarine predator guilds.