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Evidence of niche partitioning under ontogenetic influences among three morphologically similar siluriformes in small subtropical streams.
PLoS One 2014; 9(10):e110999Plos

Abstract

Ontogenetic influences in patterns of niche breadth and feeding overlap were investigated in three species of Siluriformes (Heptapterus sp., Rhamdia quelen and Trichomycterus poikilos) aiming at understanding the species coexistence. Samplings were conducted bimonthly by electrofishing technique from June/2012 to June/2013 in ten streams of the northwestern state of Rio Grande do Sul, Brazil. The stomach contents of 1,948 individuals were analyzed by volumetric method, with 59 food items identified. In general Heptapterus sp. consumed a high proportion of Aegla sp., terrestrial plant remains and Megaloptera; R. quelen consumed fish, and Oligochaeta, followed by Aegla sp.; while the diet of T. poikilos was based on Simuliidae, Ephemeroptera and Trichoptera. Specie segregation was observed in the NMDS. Through PERMANOVA analysis feeding differences among species, and between a combination of species plus size classes were observed. IndVal showed which items were indicators of these differences. Niche breadth values were high for all species. The niche breadth values were low only for the larger size of R. quelen and Heptapterus sp. while T. poikilos values were more similar. Overall the species were a low feeding overlap values. The higher frequency of high feeding overlap was observed for interaction between Heptapterus sp. and T. poikilos. The null model confirmed the niche partitioning between the species. The higher frequency of high and intermediate feeding overlap values were reported to smaller size classes. The null model showed resource sharing between the species/size class. Therefore, overall species showed a resource partitioning because of the use of occasional items. However, these species share resources mainly in the early ontogenetic stages until the emphasized change of morphological characteristics leading to trophic niche expansion and the apparent segregation observed.

Authors+Show Affiliations

Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Departamento de Zoologia, Programa de Pós-Graduação em Biologia Animal, CEP 91501-970, Porto Alegre, Rio Grande do Sul, Brazil.Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Departamento de Zoologia, Programa de Pós-Graduação em Biologia Animal, CEP 91501-970, Porto Alegre, Rio Grande do Sul, Brazil.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25340614

Citation

Bonato, Karine Orlandi, and Clarice Bernhardt Fialho. "Evidence of Niche Partitioning Under Ontogenetic Influences Among Three Morphologically Similar Siluriformes in Small Subtropical Streams." PloS One, vol. 9, no. 10, 2014, pp. e110999.
Bonato KO, Fialho CB. Evidence of niche partitioning under ontogenetic influences among three morphologically similar siluriformes in small subtropical streams. PLoS ONE. 2014;9(10):e110999.
Bonato, K. O., & Fialho, C. B. (2014). Evidence of niche partitioning under ontogenetic influences among three morphologically similar siluriformes in small subtropical streams. PloS One, 9(10), pp. e110999. doi:10.1371/journal.pone.0110999.
Bonato KO, Fialho CB. Evidence of Niche Partitioning Under Ontogenetic Influences Among Three Morphologically Similar Siluriformes in Small Subtropical Streams. PLoS ONE. 2014;9(10):e110999. PubMed PMID: 25340614.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evidence of niche partitioning under ontogenetic influences among three morphologically similar siluriformes in small subtropical streams. AU - Bonato,Karine Orlandi, AU - Fialho,Clarice Bernhardt, Y1 - 2014/10/23/ PY - 2014/05/23/received PY - 2014/09/26/accepted PY - 2014/10/24/entrez PY - 2014/10/24/pubmed PY - 2016/2/2/medline SP - e110999 EP - e110999 JF - PloS one JO - PLoS ONE VL - 9 IS - 10 N2 - Ontogenetic influences in patterns of niche breadth and feeding overlap were investigated in three species of Siluriformes (Heptapterus sp., Rhamdia quelen and Trichomycterus poikilos) aiming at understanding the species coexistence. Samplings were conducted bimonthly by electrofishing technique from June/2012 to June/2013 in ten streams of the northwestern state of Rio Grande do Sul, Brazil. The stomach contents of 1,948 individuals were analyzed by volumetric method, with 59 food items identified. In general Heptapterus sp. consumed a high proportion of Aegla sp., terrestrial plant remains and Megaloptera; R. quelen consumed fish, and Oligochaeta, followed by Aegla sp.; while the diet of T. poikilos was based on Simuliidae, Ephemeroptera and Trichoptera. Specie segregation was observed in the NMDS. Through PERMANOVA analysis feeding differences among species, and between a combination of species plus size classes were observed. IndVal showed which items were indicators of these differences. Niche breadth values were high for all species. The niche breadth values were low only for the larger size of R. quelen and Heptapterus sp. while T. poikilos values were more similar. Overall the species were a low feeding overlap values. The higher frequency of high feeding overlap was observed for interaction between Heptapterus sp. and T. poikilos. The null model confirmed the niche partitioning between the species. The higher frequency of high and intermediate feeding overlap values were reported to smaller size classes. The null model showed resource sharing between the species/size class. Therefore, overall species showed a resource partitioning because of the use of occasional items. However, these species share resources mainly in the early ontogenetic stages until the emphasized change of morphological characteristics leading to trophic niche expansion and the apparent segregation observed. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/25340614/Evidence_of_niche_partitioning_under_ontogenetic_influences_among_three_morphologically_similar_siluriformes_in_small_subtropical_streams_ L2 - http://dx.plos.org/10.1371/journal.pone.0110999 DB - PRIME DP - Unbound Medicine ER -