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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Benthic scavenger assemblages along a depth gradient: megafauna-macrofauna divergence.

Diego Carreira-Flores1, Filipa Rodrigues2, Pedro T Gomes2

  • 1Instituto de Biodiversidade Agraria e Desenvolvemento Rural (IBADER), Lab. Biodiversidade (GI-1934 TB), Campus Terra, Universidade de Santiago, Lugo, 27002, Spain; Centre of Molecular and Environmental Biology (CBMA) and Aquatic Research Network (ARNET), Department of Biology, University of Minho, Braga, 4704-553, Portugal.

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|June 18, 2026
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Summary

Benthic scavengers in soft-bottom ecosystems show depth-related patterns. Megafauna communities varied by depth, while macrofauna remained consistent, highlighting the importance of abundance versus biomass metrics.

Keywords:
Baited trapsNW Iberian PeninsulaNorth PortugalSoft bottoms

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Area of Science:

  • Marine Ecology
  • Benthic Ecology
  • Biodiversity Studies

Background:

  • Benthic scavengers are crucial for nutrient cycling in soft-bottom ecosystems.
  • Depth-related patterns of scavenger communities are poorly understood.

Purpose of the Study:

  • To characterize depth-related patterns of benthic scavenger assemblages.
  • To assess the distribution and ecology of megafauna and macrofauna scavengers along a soft-bottom depth gradient.

Main Methods:

  • Baited traps were deployed at 30, 50, and 70m depths in Viana do Castelo, NW Iberian Peninsula.
  • Megafauna and macrofauna communities were sampled to analyze depth-related variations.

Main Results:

  • Megafaunal assemblages significantly differed with depth, with abundance and biomass metrics revealing distinct patterns.
  • Macrofaunal assemblages showed no significant depth variation, dominated by amphipods and isopods.
  • Tritia reticulata abundance characterized mid-depths, while Polybius henslowii biomass dominated shallow sites.

Conclusions:

  • Depth influences megafaunal scavenger communities, but not macrofaunal ones in this region.
  • Abundance and biomass metrics provide complementary insights into faunal responses to environmental gradients.
  • A depth-resolved baseline for soft-bottom scavenger biodiversity in North Portugal was established.