Global change in the functional diversity of marine fisheries exploitation over the past 65 years

Trindade-Santos, Isaac; Moyes, Faye; Magurran, Anne E.

doi:10.1098/rspb.2020.0889

Cited by 36 publications

(38 citation statements)

References 57 publications

(79 reference statements)

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“…Environmentally driven trait similarity supports a "periodic table of niches" (27), which hypothesizes that predictable community configurations should arise in response to similar environmental conditions through common responses to environmental filtering. Therefore, the predictability of reef fish trait composition could be key for anticipating future changes in ecosystem functioning and ecosystem services under climate change and human development (34,35). Our results also imply that trait-based resource management strategies can be applied among regions with distinct species pools (36).…”

Section: Discussionmentioning

confidence: 67%

Trait similarity in reef fish faunas across the world’s oceans

McLean

Stuart‐Smith

Villéger

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Species’ traits, rather than taxonomic identities, determine community assembly and ecosystem functioning, yet biogeographic patterns have been far less studied for traits. While both environmental conditions and evolutionary history shape trait biogeography, their relative contributions are largely unknown for most organisms. Here, we explore the global biogeography of reef fish traits for 2,786 species from 89 ecoregions spanning eight marine realms with contrasting environmental conditions and evolutionary histories. Across realms, we found a common structure in the distribution of species traits despite a 10-fold gradient in species richness, with a defined “backbone” of 21 trait combinations shared by all realms globally, both temperate and tropical. Across ecoregions, assemblages under similar environmental conditions had similar trait compositions despite hosting drastically different species pools from separate evolutionary lineages. Thus, despite being separated by thousands of kilometers and millions of years of evolution, similar environments host similar trait compositions in reef fish assemblages worldwide. Our findings suggest that similar trait-based management strategies can be applied among regions with distinct species pools, potentially improving conservation outcomes across diverse jurisdictions.

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Section: Discussionmentioning

confidence: 67%

Trait similarity in reef fish faunas across the world’s oceans

McLean

Stuart‐Smith

Villéger

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Dimensionality reduction can then be a necessary step because some widely used functional diversity indices (e.g., functional richness) are based on the volume of trait space (convex hull volume) occupied by species of a given ecosystem (Laliberte & Legendre, 2010; Trindade‐Santos et al, 2020; Villeger et al, 2008) that can be hardly calculated beyond six dimensions, even less (four to five) if null models are required or when pairwise site measures like β‐diversity have to be estimated (Loiseau et al, 2017; Pimiento et al, 2020b; Su et al, 2021; Villeger et al, 2011). Because most common functional diversity indices are sensitive to the degree of correlation among traits (Zhu et al, 2017), we also suggest to compute these indices from a reduced number of independent PCoA axes to improve the capacity to distinguish between communities along gradients of stress (Trindade‐Santos et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

The dimensionality and structure of species trait spaces

et al. 2021

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Trait‐based ecology aims to understand the processes that generate the overarching diversity of organismal traits and their influence on ecosystem functioning. Achieving this goal requires simplifying this complexity in synthetic axes defining a trait space and to cluster species based on their traits while identifying those with unique combinations of traits. However, so far, we know little about the dimensionality, the robustness to trait omission and the structure of these trait spaces. Here, we propose a unified framework and a synthesis across 30 trait datasets representing a broad variety of taxa, ecosystems and spatial scales to show that a common trade‐off between trait space quality and operationality appears between three and six dimensions. The robustness to trait omission is generally low but highly variable among datasets. We also highlight invariant scaling relationships, whatever organismal complexity, between the number of clusters, the number of species in the dominant cluster and the number of unique species with total species richness. When species richness increases, the number of unique species saturates, whereas species tend to disproportionately pack in the richest cluster. Based on these results, we propose some rules of thumb to build species trait spaces and estimate subsequent functional diversity indices.

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“…Indeed, we observed a decrease in fish mean community body size, reproductive load, and trophic level since a year of use of fishing grounds, and erosion of these traits in all the evaluated areas since 2003, the beginning of our evaluation. Global trends in fish functional diversity show that fisheries extract high levels of fish functional richness in many Large Marine Ecosystems, increasing particular functional groups and reducing functional evenness (Trindade-Santos et al, 2020). In our study, fish functional trait variability [dispersion] correlated positively with functional evenness and specialisation (Table S3).…”

mentioning

confidence: 55%

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

Diaz¹,

Bovcon²,

Cochia³

et al. 2021

Preprint

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The relationship between fish functional diversity and fishing levels at which its baselines shift is important to identify the consequences of fishing in ecosystem functioning. For the first time, we implemented a trait-based approach in the Argentine Patagonian sea to identify the vulnerability and spatiotemporal changes in functional diversity of fish assemblages bycatch by a trawling fleet targeting the Argentine red shrimp Pleoticus muelleri (Spence Bate, 1888) between 2003 and 2014. We coupled seven fish trophic traits to a reconstructed fish assemblage for the study area and bycatch and evaluated changes in fish species richness and four complementary functional diversity metrics [functional richness, redundancy, dispersion, and community trait values] along with fishing intensity, temporal use, latitudinal location, and depth of fishing grounds. Resident fishes larger than 30 cm in TL, with depressed and fusiform bodies, intermediate to high trophic levels, and feeding in shallow benthic, benthodemersal, and benthopelagic areas were vulnerable to bycatch. Fish assemblages exhibited a low functional trait redundancy, likely related to species influxes in a biogeographic ecotone with tropicalisation signs. Significantly increases in fish trait richness and dispersion polewards and with depth suggested new functional roles in these grounds, matching trends in community body size, reproductive load, maximum depth, trophic level, and diet breadth. Finally, a temporal increase in fish species and functional trait removal in fishing grounds led to trait homogenisation since the first year of trawling. The identified tipping points in temperate fish functional trait diversity highlight trait-based approaches within ecosystem-based fisheries management.

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Global change in the functional diversity of marine fisheries exploitation over the past 65 years

Cited by 36 publications

References 57 publications

Trait similarity in reef fish faunas across the world’s oceans

Trait similarity in reef fish faunas across the world’s oceans

The dimensionality and structure of species trait spaces

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

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