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Contributions of body size, habitat and taxonomy to predictions of temperate Australian fish diets
journal contribution
posted on 2023-05-18, 17:49 authored by German Soler AlarconGerman Soler Alarcon, Thomson, RJ, Richard Stuart-SmithRichard Stuart-Smith, Smith, ADM, Graham EdgarGraham EdgarUsing k-nearest neighbour procedures to predict prey type and linear models to predict mean prey size, we developed a 2-step dietary model based on the stomach contents of fish of known species, size and location from Western Port, Victoria (Australia). The model, nicknamed ‘Consume’, was used to assess the relative extent to which fish diet varied with body size, species identity, season, and location. Both prey type (mean overlap between predicted and actual prey types = 77%) and mean prey size (r2 between predicted and observed mean prey size = 93%) were predicted with reasonable accuracy when species identity and length of consumer fish were known. The most important predictor for prey type was the size of the individual consumer, while the most important predictor for mean prey size was the consumer’s taxonomic identity. Predictors were individually removed from both k-nearest neighbour and linear models to assess their relative contributions to the model. Little loss of accuracy (1%) was evident when family rather than species identity was used for both prey type and mean prey size. Environmental information associated with the time and location of fish sampling (habitat, site and season) contributed only marginally to predictions of prey type. Use of the Consume model will allow for an improved understanding of community-level trophic pathways through the integration of prey type and size predictions for consumer fishes.
Funding
Australian Research Council
Department of Parks and Wildlife (Western Australia)
Dept of Environment & Natural Resources South Australia
NSW Department of Environment, Climate Change and Water
Parks Victoria
Tasmanian Parks and Wildlife Service
History
Publication title
Marine Ecology Progress SeriesVolume
545Pagination
239-249ISSN
0171-8630Department/School
Institute for Marine and Antarctic StudiesPublisher
Inter-ResearchPlace of publication
Nordbunte 23, Oldendorf Luhe, Germany, D-21385Rights statement
Copyright 2016 Inter-ResearchRepository Status
- Open