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Competition and resource breadth shape niche variation and overlap in multiple trophic dimensions.
Proc Biol Sci 2019; 286(1902):20190369PB

Abstract

Competition plays a central role in the maintenance of biodiversity. A backbone of classic niche theory is that local coexistence of competitors is favoured by the contraction or divergence of species' niches. However, this effect should depend on the diversity of resources available in the local environment, particularly when resources vary in multiple ecological dimensions. Here, we investigated how available resource breadth (i.e. prey diversity) and competition together shape multidimensional niche variation (between and within individuals) and interspecific niche overlap in 42 populations of congeneric tropical frog species. We modelled realized niches in two key trophic dimensions (prey size and carbon stable isotopes) and sampled available food resources to quantify two-dimensional resource breadth. We found a 14-fold variation in multidimensional population niche width across populations, most of which was accounted for by within-individual diet variation. This striking variation was predicted by an interaction whereby individual niche breadth increased with resource breadth and decreased with the number of congeneric competitors. These ecological gradients also interact to influence the degree of niche overlap between species, which surprisingly decreased with population total niche width, providing novel insights on how similar species can coexist in local communities. Together, our results emphasize that patterns of exploitation of resources in multiple dimensions are driven by both competitive interactions and extrinsic factors such as local resource breadth.

Authors+Show Affiliations

1 Programa de Pós-Graduação em Ecologia e Biodiversidade, Universidade Estadual Paulista (UNESP) , Rio Claro , Brazil. 2 Instituto de Biociências, Universidade Estadual Paulista (UNESP) , Rio Claro , Brazil. 3 Department of Zoology, University of Otago , PO Box 56, Dunedin 9054 , New Zealand.2 Instituto de Biociências, Universidade Estadual Paulista (UNESP) , Rio Claro , Brazil.4 Instituto de Biociências, Universidade Federal de Mato Grosso do Sul , Campo Grande , Brazil.3 Department of Zoology, University of Otago , PO Box 56, Dunedin 9054 , New Zealand.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31039715

Citation

Costa-Pereira, Raul, et al. "Competition and Resource Breadth Shape Niche Variation and Overlap in Multiple Trophic Dimensions." Proceedings. Biological Sciences, vol. 286, no. 1902, 2019, p. 20190369.
Costa-Pereira R, Araújo MS, Souza FL, et al. Competition and resource breadth shape niche variation and overlap in multiple trophic dimensions. Proc Biol Sci. 2019;286(1902):20190369.
Costa-Pereira, R., Araújo, M. S., Souza, F. L., & Ingram, T. (2019). Competition and resource breadth shape niche variation and overlap in multiple trophic dimensions. Proceedings. Biological Sciences, 286(1902), p. 20190369. doi:10.1098/rspb.2019.0369.
Costa-Pereira R, et al. Competition and Resource Breadth Shape Niche Variation and Overlap in Multiple Trophic Dimensions. Proc Biol Sci. 2019 May 15;286(1902):20190369. PubMed PMID: 31039715.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Competition and resource breadth shape niche variation and overlap in multiple trophic dimensions. AU - Costa-Pereira,Raul, AU - Araújo,Márcio S, AU - Souza,Franco L, AU - Ingram,Travis, PY - 2020/05/15/pmc-release PY - 2019/5/2/entrez PY - 2019/5/2/pubmed PY - 2019/5/2/medline KW - Leptodactylus KW - individual specialization KW - multidimensional KW - niche partitioning KW - niche shift KW - stable isotopes SP - 20190369 EP - 20190369 JF - Proceedings. Biological sciences JO - Proc. Biol. Sci. VL - 286 IS - 1902 N2 - Competition plays a central role in the maintenance of biodiversity. A backbone of classic niche theory is that local coexistence of competitors is favoured by the contraction or divergence of species' niches. However, this effect should depend on the diversity of resources available in the local environment, particularly when resources vary in multiple ecological dimensions. Here, we investigated how available resource breadth (i.e. prey diversity) and competition together shape multidimensional niche variation (between and within individuals) and interspecific niche overlap in 42 populations of congeneric tropical frog species. We modelled realized niches in two key trophic dimensions (prey size and carbon stable isotopes) and sampled available food resources to quantify two-dimensional resource breadth. We found a 14-fold variation in multidimensional population niche width across populations, most of which was accounted for by within-individual diet variation. This striking variation was predicted by an interaction whereby individual niche breadth increased with resource breadth and decreased with the number of congeneric competitors. These ecological gradients also interact to influence the degree of niche overlap between species, which surprisingly decreased with population total niche width, providing novel insights on how similar species can coexist in local communities. Together, our results emphasize that patterns of exploitation of resources in multiple dimensions are driven by both competitive interactions and extrinsic factors such as local resource breadth. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/31039715/Competition_and_resource_breadth_shape_niche_variation_and_overlap_in_multiple_trophic_dimensions_ L2 - https://royalsocietypublishing.org/doi/full/10.1098/rspb.2019.0369?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -