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Is resource partitioning the key? The role of intra-interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers.
J Fish Biol 2018; 93(2):238-249JF

Abstract

This study focused on intra and interspecific variations in the diet of small species in the Pelotas River, upper Uruguay River ecoregion. We tested the hypothesis that five small characids coexist via resource partitioning. Samplings were performed quarterly between August 2013 and May 2014 at 14 sites in the Pelotas River basin, using gillnets of different mesh sizes, seines, cast nets and electrofishing. In this study, the contents of 1,253 stomachs were analysed from Astyanax dissensus, A. paris, A. saguazu, A. xiru and Bryconamericus patriciae. The main food resources consumed were aquatic insects, leaves, seeds and detritus. There were significant seasonal intra and interspecific variations in the use of food resources by the five species. Permutational analysis of multivariate dispersions results indicated significant differences in individual intraspecific variability between the sampled periods, with the highest values found in November and February because of an increase in allochthonous resources (leaves and seeds). Besides this, significant differences in the proportions of consumption of allochthonous and autochthonous were observed. The trophic niche breadth was significantly different among the species, such that in August, the species had narrower niche breadths. In the other periods, the highest niche breadth values were due to an increase in the consumption of allochthonous items. Diet overlap was low (< 0.4) between 62% of the species pairs. The small characid species showed pronounced changes in resource use and intra and interspecific variations indicating resource partitioning. These factors appear to be essential in species interactions and for coexistence.

Authors+Show Affiliations

Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade de Maringá, Paraná, Brazil.Universidade Estadual do Oeste do Paraná, Programa de Pós-Graduação em Ciências Ambientais, Paraná, Brazil.Universidade Estadual do Oeste do Paraná, Programa de Pós-Graduação em Recursos Pesqueiros e Engenharia de Pesca, Paraná, Brazil.Universidade Estadual do Oeste do Paraná, Centro de Ciências Biológicas e da Saúde, Programa de Pós-Graduação em Conservação e Manejo de Recursos Naturais, Rua Universitária, 2069, Jardim Universitário, Paraná, Brazil.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30241113

Citation

Neves, Mayara P., et al. "Is Resource Partitioning the Key? the Role of Intra-interspecific Variation in Coexistence Among Five Small Endemic Fish Species (Characidae) in Subtropical Rivers." Journal of Fish Biology, vol. 93, no. 2, 2018, pp. 238-249.
Neves MP, Da Silva JC, Baumgartner D, et al. Is resource partitioning the key? The role of intra-interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers. J Fish Biol. 2018;93(2):238-249.
Neves, M. P., Da Silva, J. C., Baumgartner, D., Baumgartner, G., & Delariva, R. L. (2018). Is resource partitioning the key? The role of intra-interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers. Journal of Fish Biology, 93(2), pp. 238-249. doi:10.1111/jfb.13662.
Neves MP, et al. Is Resource Partitioning the Key? the Role of Intra-interspecific Variation in Coexistence Among Five Small Endemic Fish Species (Characidae) in Subtropical Rivers. J Fish Biol. 2018;93(2):238-249. PubMed PMID: 30241113.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Is resource partitioning the key? The role of intra-interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers. AU - Neves,Mayara P, AU - Da Silva,Jislaine C, AU - Baumgartner,Dirceu, AU - Baumgartner,Gilmar, AU - Delariva,Rosilene L, PY - 2018/01/07/received PY - 2018/05/25/accepted PY - 2018/9/22/entrez PY - 2018/9/22/pubmed PY - 2018/11/27/medline KW - dietary overlap KW - lotic environments KW - niche breadth KW - river KW - seasonality KW - trophic ecology SP - 238 EP - 249 JF - Journal of fish biology JO - J. Fish Biol. VL - 93 IS - 2 N2 - This study focused on intra and interspecific variations in the diet of small species in the Pelotas River, upper Uruguay River ecoregion. We tested the hypothesis that five small characids coexist via resource partitioning. Samplings were performed quarterly between August 2013 and May 2014 at 14 sites in the Pelotas River basin, using gillnets of different mesh sizes, seines, cast nets and electrofishing. In this study, the contents of 1,253 stomachs were analysed from Astyanax dissensus, A. paris, A. saguazu, A. xiru and Bryconamericus patriciae. The main food resources consumed were aquatic insects, leaves, seeds and detritus. There were significant seasonal intra and interspecific variations in the use of food resources by the five species. Permutational analysis of multivariate dispersions results indicated significant differences in individual intraspecific variability between the sampled periods, with the highest values found in November and February because of an increase in allochthonous resources (leaves and seeds). Besides this, significant differences in the proportions of consumption of allochthonous and autochthonous were observed. The trophic niche breadth was significantly different among the species, such that in August, the species had narrower niche breadths. In the other periods, the highest niche breadth values were due to an increase in the consumption of allochthonous items. Diet overlap was low (< 0.4) between 62% of the species pairs. The small characid species showed pronounced changes in resource use and intra and interspecific variations indicating resource partitioning. These factors appear to be essential in species interactions and for coexistence. SN - 1095-8649 UR - https://www.unboundmedicine.com/medline/citation/30241113/Is_resource_partitioning_the_key_The_role_of_intra_interspecific_variation_in_coexistence_among_five_small_endemic_fish_species__Characidae__in_subtropical_rivers_ L2 - https://doi.org/10.1111/jfb.13662 DB - PRIME DP - Unbound Medicine ER -