Abstract
The diet of three cooccurring abundant fish species (Eucinostomus argenteus, Diapterus rhombeus and Micropogonias furnieri) and its ontogenetic changes in a mudflat area of a tropical bay in southeastern Brazil were described. The working hypothesis is that these three species shift the use of the available resources throughout their growth. Early juveniles of D. rhombeus and M. furnieri fed mainly on Cyclopoida copepods, shifting to Nematoda (D. rhombeus) and errant Polychaeta (M. furnieri) as they increased in size. In contrast, the early life stages of E. argenteus fed mainly on errant Polychaeta and Calanoida copepods, with increasing niche breadth as they grew. The relative degree of individual specialisation in resource use indicated specialism for M. furnieri and E. argenteus, and generalism for D. rhombeus. The largest intraspecific overlap was found for the smallest size classes. Niche breadth increased during ontogeny, with a higher average niche breadth at lower prey length/predator length ratios. Therefore, species-specific differences in diet across the resource gradient and increased niche breadth during ontogeny characterised the shifts of resource use, and probably account for the coexistence of these species in zones of sympatry in mudflat areas of southeastern Brazil.
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Acknowledgments
The authors thank Iracema David Gomes, Ana Paula Penha Guedes and Márcia Cristina Costa Azevedo for helping in fieldwork. This work was financially supported by CNPq—Brazilian National Agency for Scientific and Technological Development (Proc. 302878/05-0 and 302555/08-0) and FAPERJ (Rio de Janeiro State Agency for Research Development (Proc. E-26/170.258/01).
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Communicated by K. D. Clements.
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Pessanha, A.L.M., Araújo, F.G. Shifts of the feeding niche along the size dimension of three juvenile fish species in a tidal mudflat in southeastern Brazil. Mar Biol 161, 543–550 (2014). https://doi.org/10.1007/s00227-013-2356-8
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DOI: https://doi.org/10.1007/s00227-013-2356-8