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Updated: Mar 6, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
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Species composition of dabbling duck assemblages: ecomorphological patterns compared with null models.

H Pöysä1, J Elmberg2, P Nummi3

  • 1Evo Game Research Station, Finnish Game and Fisheries Research Institute, Kaitalammintie 75, FIN-16970, Evo, Finland.

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|March 18, 2017
PubMed
Summary

Dabbling duck assemblages showed greater body length differences than expected, supporting the competition hypothesis, especially in low-food lakes. Bill spacing patterns were unrelated to food availability.

Keywords:
Body length Bill lamellar densityCompetitionNull modelsSpecies composition

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Ornithology

Background:

  • Ecomorphological patterns in avian assemblages are crucial for understanding community structure.
  • Competition and resource availability are key drivers shaping species coexistence.
  • Dabbling ducks (Anas spp.) offer a model system to study these ecological dynamics.

Purpose of the Study:

  • To investigate ecomorphological spacing patterns in breeding dabbling duck assemblages.
  • To compare observed species spacings with null model expectations under varying constraints.
  • To assess the relationship between spacing patterns and prey availability/diversity.

Main Methods:

  • Studied six northern European regions with breeding dabbling duck assemblages.
  • Compared species' bill lamellar density and body length with null model predictions.
  • Analyzed deviations from expected spacings against prey abundance and size diversity.

Main Results:

  • Observed body length spacings were greater than null model expectations, unlike bill lamellar density.
  • Abundant species showed greater body length divergence than less abundant ones.
  • Body length spacing deviations aligned with competition predictions in low-food lakes.

Conclusions:

  • Body length spacing patterns in dabbling ducks are consistent with interspecific competition.
  • Competition appears more influential in resource-limited environments.
  • Bill lamellar density does not appear to be a primary driver of spacing in these assemblages.