Fish functional diversity as an indicator of resilience to industrial fishing in Patagonia Argentina

Rincón-Díaz, Martha Patricia; Bovcon, Nelson D.; Cochia, P. D.; Góngora, María Eva; Galván, David Edgardo

doi:10.1111/jfb.14873

Cited by 20 publications

(13 citation statements)

References 70 publications

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“…The node “fishery” had a TL of 4.4, being among the top ten predators. In accordance with our characterization of the fishery and its effects, a functional diversity description of the San Jorge gulf fish assemblages showed that demersal and benthic species bigger than 30 cm of total length with intermediate to high TLs were the most vulnerable to shrimp fishery 22 . Moreover, the sites with higher industrial trawling activity have assemblages with slightly lower mean TL 22 , coinciding with the overall effect of the fishery of the decrease in the mean TL.…”

Section: Discussionsupporting

confidence: 84%

“…Thus, all these changes reflect an important modification of energy fluxes likely produced by the fishery. Specifically in an ecosystem as the SJG with low functional diversity, where each ecological role is covered by one or a few species, and the potential loss of a species compromises its ecological function 22 . We were unable to quantify these changes but most network metrics imply a decrease in stability that in turn suggest the system could change its state, and influence the ecosystem functioning.…”

Section: Discussionmentioning

confidence: 99%

“…SJG is a particularly productive area in Argentina’s waters where the fisheries coexist with big aggregations of marine mammals and seabirds’ colonies, oil extraction and touristic activity 21 . The local fish assemblage has low redundancy, where each ecological role was accomplished, on average, by one species 22 . Likewise, it was reported that bottom trawl fishery erodes fish functional diversity, leading towards homogenization 22 .…”

Section: Introductionmentioning

confidence: 99%

“…The local fish assemblage has low redundancy, where each ecological role was accomplished, on average, by one species 22 . Likewise, it was reported that bottom trawl fishery erodes fish functional diversity, leading towards homogenization 22 . In the shrimp fishery, 81 species are incidentally caught.…”

Section: Introductionmentioning

confidence: 99%

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Network analysis suggests changes in food web stability produced by bottom trawl fishery in Patagonia

Funes

Saravia

Cordone

et al. 2022

Sci Rep

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Demersal fisheries are one of the top anthropic stressors in marine environments. In the long term, some species are more vulnerable to fishery impacts than others, which can lead to permanent changes on the food web. The trophic relationships between predator and prey constitute the food web and it represents a network of the energy channels in an ecosystem. In turn, the network structure influences ecosystem diversity and stability. The first aim of this study was to describe for the first time the food web of the San Jorge Gulf (Patagonia Argentina) with high resolution, i.e. to the species level when information is available. The San Jorge Gulf was subject to intense fisheries thus our second aim is to analyse the food web structure with and without fishery to evaluate if the bottom-trawl industrial fishery altered the network structure and stability. We used several network metrics like: mean trophic level, omnivory, modularity and quasi-sign stability. We included these metrics because they are related to stability and can be evaluated using predator diets that can weight the links between predators and prey. The network presented 165 species organized in almost five trophic levels. The inclusion of a fishery node adds 69 new trophic links. All weighted and unweighted metrics showed differences between the two networks, reflecting a decrease in stability when fishery was included in the system. Thus, our results suggested a probable change of state of the system. The observed changes in species abundances since the fishery was established, could represent the state change predicted by network analysis. Our results suggests that changes in the stability of food webs can be used to evaluate the impacts of human activity on ecosystems.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Network analysis suggests changes in food web stability produced by bottom trawl fishery in Patagonia

Funes

Saravia

Cordone

et al. 2022

Sci Rep

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“…To date, investigations of temporal change in marine ecosystems have focused on single populations [49,50]. However, it is becoming clear that multi-species, assemblage-based analyses [51,52], which include information on functional and taxonomic diversity, and potentially also phylogenetic diversity, will be important in tracking biodiversity change in these systems, predicting their resilience in the face of anthropogenic pressures [53], and in shaping conservation decisions and designing fisheries policy [54][55][56]. As our investigation has shown, different dimensions of biodiversity change are not necessarily correlated.…”

Section: Discussionmentioning

confidence: 99%

Temporal change in functional rarity in marine fish assemblages

2023

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Recent research has uncovered rapid compositional and structural reorganization of ecological assemblages, with these changes particularly evident in marine ecosystems. However, the extent to which these ongoing changes in taxonomic diversity are a proxy for change in functional diversity is not well understood. Here we focus on trends in rarity to ask how taxonomic rarity and functional rarity covary over time. Our analysis, drawing on 30 years of scientific trawl data, reveals that the direction of temporal shifts in taxonomic rarity in two Scottish marine ecosystems is consistent with a null model of change in assemblage size (i.e. change in numbers of species and/or individuals). In both cases, however, functional rarity increases, as assemblages become larger, rather than showing the expected decrease. These results underline the importance of measuring both taxonomic and functional dimensions of diversity when assessing and interpreting biodiversity change.

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Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Irigoitia

Levy

Canel

et al. 2022

Aquatic Conservation

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1. Populations of chondrichthyans are particularly sensitive to elevated fishing mortality due to their low reproductive potential and very low population growth.2. Dipturus brevicaudatus is a common and endemic skate from waters of Argentina and is frequently caught as by-catch and is therefore extremely vulnerable to commercial fishing. There are signs of overfishing in both the northern and southern Argentine Sea and the species has been classified as 'Vulnerable' by the International Union for Conservation of Nature. 3. A parasitological examination of 96 skates revealed 1,913 individual macroparasites belonging to 18 species and one myxozoan. Three parasite species were long-lived and were suitable biological tags, resulting in statistically significant differences between North Patagonic and both Buenos Aires and South Patagonic regions and therefore can be used to identify stocks of D. brevicaudatus. The inclusion of short-lived parasites in the analyses suggested the existence of three stocks. 4. Parasite assemblages from the northern Argentine Sea (Buenos Aires, Argentine biogeographical province) and from Patagonian waters (North and South Patagonic, Magellanic biogeographical province) varied in terms of parasite infracommunity species richness and the relative abundance of parasite guilds.5. Using parasites to infer the existence of three stocks of D. brevicaudatus provides the basis to help establishing management and recovery strategies to preserve the diversity of this vulnerable skate in the south-west Atlantic Ocean.6. Due to the low host specificity of the long-lived parasite tags, there is potential to extend this methodology to other skate species that are commercially exploited in the region, whose population structures remain unknown.

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Fish functional diversity as an indicator of resilience to industrial fishing in Patagonia Argentina

Cited by 20 publications

References 70 publications

Network analysis suggests changes in food web stability produced by bottom trawl fishery in Patagonia

Network analysis suggests changes in food web stability produced by bottom trawl fishery in Patagonia

Temporal change in functional rarity in marine fish assemblages

Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

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