Estuaries and Coasts

, Volume 42, Issue 3, pp 890–899 | Cite as

Rare Species Enhance Niche Differentiation Among Tropical Estuarine Fish Species

  • Victor E. L. da SilvaEmail author
  • Nidia N. Fabré


Based on the assumption that rare species in estuarine systems may display a different set of traits relative to common species, we hypothesized that the extirpation of rare species would negatively affect functional diversity components of these ecosystems. Therefore, the contribution of rare species to the functional structure of estuarine fish assemblages in a tropical estuarine lagoon was tested using two different simulation scenarios of species loss: (1) losing the rare species first and (2) removal occurring at random. Overall, high functional redundancy among studied estuarine fish species was found, with many species, including some rare species performing similar functions as shown by the consistent and marked species’ overlap in the functional space. Nevertheless, the removal of rare species negatively impacted niche differentiation among assemblages, indicating that while rare species play redundant functions in the studied estuary, they also have a crucial role in increasing niche differentiation among fish assemblages. Such increase in niche differentiation granted by rare species—mostly represented by marine straggler species—appears to be a key component of ecosystem stability by allowing functions to be continued even when the estuary is faced with disturbances.


Estuaries Functions Rarity Resource use 



We would like to thank colleagues D. Vieira, I. Assis, E. Teixeira, and Dr. V. Batista (Federal University of Alagoas—UFAL) for their assistance during field and laboratory work; Dr. Richard Ladle and Dr. Ana Malhado (UFAL) for their comments on the manuscript; and Dr. Thiago Souza (Federal Rural University of Pernambuco) for helping with functional analysis.

Funding information

Data collection was partially funded by the State Funding Agency of Alagoas (FAPEAL) and the National Council for Scientific and Technological Development (CNPq). V.E.L.S received a CAPES PPG-DIBICT master’s fellowship from the Coordination for the Improvement of Higher Education Personnel (CAPES).

Supplementary material

12237_2019_524_MOESM1_ESM.docx (23 kb)
ESM 1 (DOCX 23 kb)
12237_2019_524_MOESM2_ESM.docx (17 kb)
ESM 2 (DOCX 17 kb)


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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  1. 1.Laboratório de Ecologia, Peixes e Pesca, Instituto de Ciências Biológicas e da SaúdeUniversidade Federal de AlagoasMaceióBrazil

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