Assessing drivers of tropical and subtropical marine fish collapses of Brazilian Exclusive Economic Zone

Verba, Júlia Tovar; Pennino, María Grazia; Coll, Marta; Lopes, Priscila F. M.

doi:10.1016/j.scitotenv.2019.134940

Cited by 24 publications

(11 citation statements)

References 82 publications

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“…In some regions of Brazil, the catch of this species represents approximately 40% of all the fishery resources (Rezende et al 2003;Frédou et al 2006), making it one of the most economically important species of the country. Nevertheless, several species of this group are already in an overexploited or collapsed state in Brazil (Anderson et al 2015;Lindeman et al 2016;Verba et al 2020), demonstrating the need for establishing sustainable fisheries practices. Among the most exploited species is the large carnivorous Dog snapper Lutjanus jocu, with a yearly global catch close to 2000 tons, of which 99% is in Brazil (Freire et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Low population genetic structure is consistent with high habitat connectivity in a commercially important fish species (Lutjanus jocu)

et al. 2022

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The level of habitat availability influences genetic divergence among populations and the genetic diversity within populations. In the marine environment, near-shore species are among the most sensitive to habitat changes. Knowledge of how historical environmental change affected habitat availability and genetic variation can be applied to the development of proactive management strategies of exploited species. Here, we modeled the contemporary and historical distribution of Lutjanus jocu in Brazil. We describe patterns of genomic diversity to better understand how climatic cycles might correlate with the species demographic history and current genetic structure. We show that during the Last Glacial Maximum, there were ecological barriers that are absent today, possibly dividing the range of the species into three geographically separated areas of suitable habitat. Consistent with a historical reduction in habitat area, our analysis of demographic changes shows that L. jocu experienced a severe bottleneck followed by a population size expansion. We also found an absence of genetic structure and similar levels of genetic diversity throughout the sampled range of the species. Collectively, our results suggest that habitat availability changes have not obviously influenced contemporary levels of genetic divergence between populations. However, our demographic analyses suggest that the high sensitivity of this species to environmental change should be taken into consideration for management strategies. Furthermore, the general low levels of genetic structure and inference of high gene flow suggest that L. jocu likely constitutes a single stock in Brazilian waters and, therefore, requires coordinated legislation and management across its distribution.

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Section: Introductionmentioning

confidence: 99%

Low population genetic structure is consistent with high habitat connectivity in a commercially important fish species (Lutjanus jocu)

et al. 2022

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“…Even though climate change renders threatened species more vulnerable to collapse (Verba et al 2020), the similarity between benthic variables used in present and future climatic scenarios modelled hereby is positive for this tribe of threatened skates.…”

Section: R a F Tmentioning

confidence: 66%

Threatened skates exhibit abiotic niche stability despite climate change in the southwestern Atlantic Ocean

2022

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Climatic changes are disrupting distribution patterns of populations through shifts in species abiotic niches and habitat loss. The abiotic niche of marine benthic taxa such as skates, however, may be more climatically stable compared to the upper layers of the water column, which are more exposed to immediate impacts of warming. Here, we estimate climate change impacts in Riorajini, a tribe of four skates, as a proxy to evaluate the vulnerability of a temperate coastal zone in the Atlantic Southwest, and study niche dynamics in a scenario of environmental changes on this group of threatened species. We modelled each species’ abiotic niche under present climatic conditions (2000–2014), projected them to the future (2100), then measured distributional stability, expansion, and unfilling. Our results revealed abiotic stability between the scenarios modelled despite the advancement of climate change, suggesting that the benthic layers where these skates occur may be a refuge from the increasing thermal stress. However, the exposure of shallow waters to climate change may be detrimental to nursery habitats. Thus, although their abiotic niche may remain stable in the future, the loss of extension of occurrence might be a peril for them with climate change.

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“…Brazil has marked regional differences when it comes to the distribution of the different types of fisheries. This is expected in a country with different levels of socioeconomic development and biogeographic peculiarities [26]. For example, artisanal fisheries are the dominant type of fishery in the north (especially in the Amazon) and the northeast (especially coastal regions), whereas industrial fisheries predominate in the south and southeast [25].…”

Section: Study Areamentioning

confidence: 99%

“…No association in the centerwest could be contacted for an interview. Although the reasons why it was harder to access organizations in certain regions are not clear, the distribution of the interviews roughly corresponds to the relevance of small-scale fisheries in each region, whereby productivity (in relation to the industrial fisheries) is mostly concentrated in the north and northeast regions [26].…”

Section: Samplingmentioning

confidence: 99%

Empowering fisherwomen leaders helped reduce the effects of the COVID-19 pandemic on fishing communities: Insights from Brazil

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et al. 2022

Marine Policy

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Assessing drivers of tropical and subtropical marine fish collapses of Brazilian Exclusive Economic Zone

Cited by 24 publications

References 82 publications

Low population genetic structure is consistent with high habitat connectivity in a commercially important fish species (Lutjanus jocu)

Low population genetic structure is consistent with high habitat connectivity in a commercially important fish species (Lutjanus jocu)

Threatened skates exhibit abiotic niche stability despite climate change in the southwestern Atlantic Ocean

Empowering fisherwomen leaders helped reduce the effects of the COVID-19 pandemic on fishing communities: Insights from Brazil

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