Distribution patterns of loliginid squid paralarvae in relation to the oceanographic features off the South Brazil Bight (22°–25°S)

Abstract

Loliginid squids constitute marine resources of increasing importance in shelf ecosystems off the coast of South Brazil. However, the existing information and knowledge about the occurrence of early-life stages and causes of distributional patterns are insufficient. Here, we have revisited Brazilian historical plankton samples waters and upwelling events, D. plei occurred primarily in the southern region of the study area and in warmer waters, and L. brevis was found in shallow and low salinity waters in the estuarine region off the coast of Santos. Overall, the highest abundance of paralarvae occurred in the nearshore, northernmost areas during summer, and this can be associated with the observed retention mechanisms caused by local circulation, seasonal upwelling, the intrusion of nutrient-rich waters, and spawning peaks. The present study provides new information and evidence for loliginid patterns in the area that may potentially be useful for better understanding the recruitment patterns and fishery assessments of squid populations. K E Y W O R D Scephalopods, early-life stages, historical marine archives, Loliginidae, oceanographic surveys

Geographic drivers of diversification in loliginid squids with an emphasis on the western Atlantic species

“…Previous works on biogeography of loliginid squids (Bartol et al, 2002;de Araujo & Gasalla, 2018;Şen, 2005;Zaragoza et al, 2015) have also hypothesized that physicochemical changes in sea water triggered by events such as river drainage may serve as barriers to dispersal for adults, paralarvae and eggs in these animals. Moreover, salinity has been suggested to influence the distribution of squids, due to the narrow salinity ranges that early developmental stages can tolerate (Cinti et al, 2004).…”

>b<Cephalopod biodiversity in the Southeastern Brazil Bight:>/b< early life stages and associated ocean processes

“…In addition, several mesoscale features related to BC circulation in the SBB (e.g., coastal upwelling, meanders, and eddies) are thought to contribute to this pattern Katsuragawa et al 2014). The distribution of cephalopod paralarvae in the SBB also appears to be linked to the regional mesoscale variability as described by some studies (Santos and Haimovici 2007;Vidal et al 2010;Martins et al 2014;Araújo and Gasalla 2018).…”

“…Although it is crucial to investigate the seasonality of the Argonautidae reproductive cycle, such studies do not explain the mechanisms by which paralarvae are transported to shallow shelf waters. The coastal upwelling system of Cabo Frio is remarkably seasonal and not only influences the local primary productivity (Gaeta and Brandini, 2006, but also the distribution of several planktonic larval species , Araújo and Gasalla, 2017. This coastal upwelling during summer is also linked to the intensity of meanders and eddies from the BC, which are neutralized by the increased northward-moving cold atmospheric fronts in winter (Gouveia et al, 2021).…”

“…Katsuragawa et al, 2014]), the distribution of cephalopods early life stages and its relationship with the oceanic dynamics from the study are still poorly understood. Despite limited in numbers of publications, there exist relevant literature available in this topic (Martins and Perez, 2006;Vidal et al, 2010;Araújo and Gasalla, 2017). Nonetheless, the present study represents the first attempt to investigate long-term changes in cephalopods distribution over the SBB, by revisiting a historical collection of samples from 1974 to 2010.…”

“…Interestingly, cephalopod diversity patterns have been linked to seasonality of oceanographic conditions in the Gulf of California (De Silva-Dávila et al 2015). The distribution of cephalopod paralarvae in the Southeastern Brazilian Bight (SBB) also appears to be associated with regional mesoscale variability, as described by the few studies performed in the area (Santos and Haimovici 2007;Vidal et al 2010;Araújo and Gasalla 2018).…”