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

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

“…Similar results were already observed in the past (in the 1970s and 1980s) for other sciaenid species in the SSB inferred from the body and/or otolith shape (e.g., Cynoscion jamaicensis, [48,49]; Macrodon ancylodon, [50]; Micropogonias furnieri, [51]; Nebris microps, [52]). However, at present (2018/2019), and 43 years later, four main population units, NSP, CSP, SSP/PR, and SC, were clearly depicted regarding I. parvipinnis population structure, as recently suggested by previous studies using alternative approaches [33,34].…”

“…An improvement in the reclassification rates has been observed when using otolith elemental signatures compared to otolith shape for several species [ 9 , 41 , 102 ]. Regarding I. parvippinis , those rates slightly increased from whole-body morphometry (79% in 2018/2019; [ 34 ]) to otoliths shape (42% in 1975, and 81% in 2018/2019; [ 33 ]), and, finally, to otolith chemical composition (58% in 1975, and 80% in 2018/2019; present study). Moreover, compared with the previous data from otolith shape [ 33 ], the present study allowed the detection of significant differences between SC and the other locations in both periods, clearly detached it as an isolated population unit for both periods, and increased the regional cross-validation reclassification success.…”

“…Fish population recruitment appears to occur between summer and autumn to winter in northeast Brazil [ 32 ]. The population structure of I. parvipinnis was recently studied in southeast–south Brazil through the study of the otolith shape [ 33 ] and body geometric morphometrics [ 34 ], revealing a complex metapopulational scenario with discrete population units.…”

Wake of Death: Using historical and contemporaneous data to evaluate the >i<Isopisthus parvipinnis>/i< (Sciaenidae) population structure at the Southwest Atlantic Ocean (23º - 26.9ºS)

“…Regarding I. parvippinis, those rates slightly increased from whole-body morphometry (79%; Hoff et al (2020b)) to otoliths shape (42% in 1975, and 81% in 2018/2019Hoff et al (2020aHoff et al ( )), and, finally, to otolith chemical composition (58% in 1975Hoff et al ( , and 80% in 2018Hoff et al ( /2019present study). Compared with the previous data from otolith shape (Hoff et al, 2020a), the present study allowed to detect significant differences between SC and other locations in both periods, clearly detached as an isolated population unit for both periods, and increased the regional cross-validation reclassification success.…”

“…Recruitment appears to occur between summer-autumn to winter in the northeast Brazil (Romero et al, 2008). The population structure of I. parvipinnis was recently studied in the SE-S Brazil through otolith shape (Hoff et al, 2020a) and body geometric morphometrics (Hoff et al, 2020b), revealing a complex metapopulational scenario with discrete population units.…”