期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 242, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2020.106839
关键词
Catfish; Estuaries; Nursery grounds; Segregation; Stock; Trace-elements
资金
- National Council for Scientific and Technological Development (CNPq)
- Ministry of Science, Technology, Innovations and Communications (MCTIC)
- Secretary of Aquaculture and Fisheries, Ministry of Agriculture, Livestock and Food Supply (SAP-MAPA) [22/2015 - Process: 445782/2015-3]
- Marine Aquarium Institute of Rio de Janeiro - AquaRio (IMAM/AquaRio)
- PELD-Baia Guanabara (CNPq) [PELD 403809/2012-6]
- CAFP-BA/SPU
- UFPR/Fundacao Arauc.aria, Universidad de Buenos Aires [292/14]
- CONICET
- Coordination for the Improvement of Higher Education Personnel (CAPES)
We use otolith trace element-to-calcium element concentraton ratios (Ba:Ca, Cu:Ca, Mg:Ca, Mn:Ca, Ni:Ca, Sr:Ca and Zn:Ca) and shape to evaluate the degree of segregation and presence of different nursery areas and fish stocks of Genidens genidens in the Brazilian coastal area. Otolith core (juvenile stage) and edge (adult stage) element:Ca fingerprints (N = 89), as well as otolith elliptic Fourier descriptors (N = 147) were compared between four estuaries. Several element:Ca ratios were significantly different between estuaries for otolith core and edge (p < 0.05). MANOVA, PERMANOVA, linear and quadratic discriminant analyses based on Fourier descriptors (12 harmonics) and microchemistry were effective for discriminating between all sampling sites (p < 0.05), except Itapanhati River and Paranagua Bay (p > 0.05). The discriminant analyses showed jackknifed classification from 54.1% to 100% considering young (core microchemistry) and adult life stages (edge microchemistry and shape). When otolith microchemistry and shape were combined, the jackknifed classification increased in relation to the separates methods, ranged from 89.5 to 100% (mean 95.2%). The high degree of segregation (low connectivity) in juvenile and adult stages between the estuaries is consistent with the presence of isolated populations, and advocates for estuary-specific management strategies.
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