In:
PLOS ONE, Public Library of Science (PLoS), Vol. 18, No. 2 ( 2023-2-27), p. e0281932-
Abstract:
This study summarises six years of spatio-temporal patterns of the discarded demersal community fauna recorded by onboard scientific observer program for both artisanal and industrial crustacean fisheries between 2014 and 2019, from mesophotic to aphotic depths (96 to 650 m) along the southern Humboldt Current System (28–38°S). In this period, one cold and two warm climatic events were observed during the austral summer 2014, 2015–2016 (ENSO Godzilla), and 2016–2017 (coastal ENSO), respectively. Satellite information showed that Chlorophyll-a concentration varied seasonally and latitudinally, associated with upwelling centres, while equatorial wind stress decreased southward of 36°S. Discards were composed of 108 species, dominated by finfish and molluscs. The Chilean hake Merluccius gayi was dominant and ubiquitous (occurrence, 95% of 9104 hauls), being the most vulnerable species of the bycatch. Three assemblages were identified: assemblage 1 (~200 m deep), dominated by flounders Hippoglossina macrops and lemon crabs Platymera gaudichaudii , assemblage 2 (~260 m deep), dominated by squat lobsters Pleuroncodes monodon and Cervimunida johni and assemblage 3 (~320 m depth), dominated by grenadiers Coelorinchus aconcagua and cardinalfish Epigonus crassicaudus . These assemblages were segregated by depth, and varied by year, and geographic zone. The latter represented changes in the width of the continental shelf, increasing southward of 36°S. Alpha-diversity indexes (richness, Shannon, Simpson, and Pielou) also varied with depth and latitude, with higher diversity in deeper continental waters ( 〉 300 m), between 2018–2019. Finally, at a spatial scale of tens of kilometres, and a monthly basis, interannual variations of biodiversity occurred in the demersal community. Surface sea temperature, chlorophyll-a, or wind stress did not correlate with discarded demersal fauna diversity of the crustacean fishery operating along central Chile.
Type of Medium:
Online Resource
ISSN:
1932-6203
DOI:
10.1371/journal.pone.0281932
DOI:
10.1371/journal.pone.0281932.g001
DOI:
10.1371/journal.pone.0281932.g002
DOI:
10.1371/journal.pone.0281932.g003
DOI:
10.1371/journal.pone.0281932.g004
DOI:
10.1371/journal.pone.0281932.g005
DOI:
10.1371/journal.pone.0281932.g006
DOI:
10.1371/journal.pone.0281932.g007
DOI:
10.1371/journal.pone.0281932.g008
DOI:
10.1371/journal.pone.0281932.g009
DOI:
10.1371/journal.pone.0281932.g010
DOI:
10.1371/journal.pone.0281932.g011
DOI:
10.1371/journal.pone.0281932.t001
DOI:
10.1371/journal.pone.0281932.t002
DOI:
10.1371/journal.pone.0281932.t003
DOI:
10.1371/journal.pone.0281932.t004
DOI:
10.1371/journal.pone.0281932.t005
DOI:
10.1371/journal.pone.0281932.s001
DOI:
10.1371/journal.pone.0281932.s002
DOI:
10.1371/journal.pone.0281932.s003
DOI:
10.1371/journal.pone.0281932.r001
DOI:
10.1371/journal.pone.0281932.r002
DOI:
10.1371/journal.pone.0281932.r003
DOI:
10.1371/journal.pone.0281932.r004
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2023
detail.hit.zdb_id:
2267670-3
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