Diferenciação geográfica de Nebris microps (Cuvier, 1830), na costa sudeste do Brasil

ABSTRACT. GEOGRAPHIC VARIATION OF MORPHOMETRIC CHARACTERS lN OGCOCEPHA -LUS VESPERTILlO (LINNAEUS) (TELEOSTEI, LOPHII FORMES, OGCOCEPHALlDAE). Patterns of geographic variation in 10 morphometric characters were analyzed in a sample of 91 specimens ofthe batfish, Ogcocephalus vespertilio (L.), from the NE and SE Brazilian coast, using multivariate statistics and randomi zation tests. The spec imens were ordinated by principal components analysis in two groups corresponding to the regions nOl1h and south of the 23°C isothenn, and size variation was found to account for 70.3 %, whereas shape differences accounted for 23.6% of the total variation in 1110rphometric characters. The two gro ups were difJerent at the 1% significance levei by multivariale analysis of variance based on the Wilk's criterion, tesled by a randol11ization procedure. Width of illicial cavity and distance ti'om anus to anal tin were the characters mosl contributing to lhe differentiation ofthe population samples.

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Past and Contemporaneous Otolith Fingerprints Reveal Potential Anthropogenic Interferences and Allows Refinement of the Population Structure of Isopisthus parvipinnis in the South Brazil Bight

Hoff

Dias

Pinto

et al. 2022

Biology

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In this study, otolith geochemical signatures (Element:Ca ratios) were used to investigate the long-term spatial shifts of the population structure of Isopisthus parvipinnis, Bigtooth corvina, an economically and ecologically important Brazilian fish species. Two-hundred and ninety-seven juvenile individuals from historical (1975) and contemporary (2018/2019) samples were collected in five subareas [São Paulo: North—NSP, Center—CSP and South—SSP; Paraná (PR) and Santa Catarina (SC)] of the shallow waters off the coast of the South Brazil Bight were analyzed. The main informative single elements were Co:Ca, Cu:Ca, Li:Ca, Mg:Ca, Mn:Ca, Ni:Ca, Na:Ca, and Rb:Ca. Multivariate analysis showed spatial differences in otolith chemical composition over the years. Samples from 1975 presented an overall low reclassification rate (58%), suggesting the existence of two population units: (1) SP + PR; and (2) SC. However, samples from 2018/2019 discriminated four distinct population units with a good overall reclassification (80%): (1) NSP; (2) CSP; (3) SSP + PR; and (4) SC. This spatial differentiation on the geochemical signatures probably reflects the effects of long-term temporal variability in oceanographic conditions, anthropogenic influence, and climate change on this coastal ecosystem. The data also corroborate and refines the population structure scenario of I. parvipinnis recently described using complementary phenotypic tags.

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Diferenciação geográfica de Nebris microps (Cuvier, 1830), na costa sudeste do Brasil

Abstract: The geographic differentiation of Ne~ mie~p~ (smalleye croaker) from the southeastern coast of Brazil is analysed~ with basis o~ the comparison of the body proportions and on the meristic characters of 78 specimens caught north and 76 south of Cabo Frio~ Rio de Janeiro.

Cited by 3 publications

References 9 publications

Population structure of the bigtooth corvina Isopisthus parvipinnis from the Southwest Atlantic Ocean as determined by whole-body morphology

Population structure of the bigtooth corvina Isopisthus parvipinnis from the Southwest Atlantic Ocean as determined by whole-body morphology

Variação geográfica de caracteres quantitativos em Ogcocephalus vespertilio (Linnaeus) (Teleostei, Lophiiformes, Ogcocephalidae)

Past and Contemporaneous Otolith Fingerprints Reveal Potential Anthropogenic Interferences and Allows Refinement of the Population Structure of Isopisthus parvipinnis in the South Brazil Bight

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