Population structure and habitat connectivity of Genidens genidens (Siluriformes) in tropical and subtropical coasts from Southwestern Atlantic

Abstract

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Spatial environmental variability of natural markers and habitat use ofCathorops spixiiin a neotropical estuary from otolith chemistry

“…These displacements could be both horizontal, through the salt wedge, and vertically (least likely). The maximum Sr/Ca values found in this study were comparable with those reported for other ariids that coexist with C. spixii such as G. barbus (range: 0.90–9.83 mmol mol −1 , Avigliano et al ., 2017 a ) and G. genidens (range: 2.4–9.0 mmol mol −1 , Maciel et al ., 2020), which make migrations between fresh water or estuary and sea. Particularly, G. barbus use freshwater environments, which could explain the relatively lower minimum Sr/Ca ratio (0.90 mmol mol −1 ) compared with that found in C. spixii (1.89 mmol mol −1 ).…”

“…The effectiveness of otolith Sr/Ca as a salinity proxy was first tested with linear regression and ANOVA. The other ratios were not used as salinity proxies because it is known that in ariids, they can be strongly susceptible to other environmental and physiological factors (Avigliano et al ., 2017 a , 2019; Maciel et al ., 2020). Several authors have estimated Sr/Ca thresholds to infer movements between environments with different salinity using the chemical signature of the otolith edge (Bradbury et al ., 2008; Panfili et al ., 2012; Avigliano et al ., 2018).…”

Habitat use of the amphidromous catfish Genidens barbus: first insights at its southern distribution limit

“…High Ba/Ca values were also reported in the core of the ancient G. barbus from Patagonia (Avigliano et al 2020a), and even in other species of the same family such as G. genidens Cuvier, 1829 (Maciel et al 2020) and Cathorops spixii Agassiz, 1829 (Maichak de Carvalho et al 2020), and in other fish taxa (Ruttenberg et al 2005). It has been suggested that potential physiological changes (e.g.…”

Sagitta otolith of three demersal species in a tropical environment

“…The otolith shape is usually species-specific, but intraspecific geographic variation may occur due to environmental factors (Santos et al, 2017;Maciel et al, 2020) acteristics to specimens inhabiting northeastern Brazil. The applied methodology was not the most sensitive to determine contour variations that may show latitudinal influence.…”

“…These structures assist the hearing and perception of the external environment (Ladich & Schulz-Mirbach, 2016). Otoliths are excellent tools for various studies of fish populations such as: habitat use and connectivity between populations using the chemistry of the otolith (Carvalho et al, 2017;Maciel et al, 2020), environmental stress indicated by the deposition of vaterita (Carvalho et al, 2019a;Holmberg et al, 2019), and age and growth (Soeth et al, 2018;Maciel et al, 2018).…”