Journal
MARINE BIOLOGY RESEARCH
Volume 14, Issue 9-10, Pages 973-988Publisher
TAYLOR & FRANCIS AS
DOI: 10.1080/17451000.2019.1572194
Keywords
Audrey Geffen; Abudefduf saxatilis; sagittae; shape and chemical analyses; life history
Categories
Funding
- Brazilian Agency for Support and Evaluation of Graduate Education (CAPES)
- National Council of Technological and Scientific Development (CNPq) [473181/2012-6, 401190/2014-5]
- Portuguese Foundation for Science and Technology (FCT) [UID/Multi/04423/2013]
- European Regional Development Fund (ERDF)
- [CAPES-1669551]
- [CNPq/PVE-314444/2014-9]
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To promote marine conservation and sustainable resources use it is highly important to understand reef fish population structure and dynamics. The sergeant major, Abudefduf saxatilis, is a common and abundant fish usually found in the Brazilian coasts, being considered a keystone-species for structuring benthic communities on reef habitats in the Atlantic Ocean. This study examined the morphology (shape indices and elliptic Fourier descriptors) and chemistry (Element:Ca) of A. saxatilis sagittal otoliths, collected in seven locations along the coast of South Brazil. Otolith morphology and chemistry were compared at short (range 0.5-2 km) and large (range 70-140 km) spatial scales using univariate and multivariate statistical approaches. Reclassification accuracy rates obtained from linear discrimination function analyses using both morphology and chemistry of otoliths were 61% and 82% for short and large spatial scales, respectively. No clear separation for individuals collected in islands within the Tamboretes Archipelago were observed suggesting that water masses are relatively homogeneous and/or that individuals could be highly mixed over short spatial scales. However, the higher reclassification success of the individuals belonging to Bom Abrigo, Galheta and Paz islands, indicates a limited movement of adults between habitats, a larval retention mechanism or a self-recruitment process occurring at large spatial scales.
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