Changes in the Specific and Biogeographic Composition of Coastal Fish Assemblages in Patagonia, Driven by Climate Change, Fishing, and Invasion by Alien Species

Galván, David Edgardo; Bovcon, Nelson D.; Cochia, P. D.; González, Raúl; Lattuca, María Eugenia; Reinaldo, Matías Ocampo; Rincón-Díaz, Martha Patricia; Romero, María Alejandra; Vanella, Fabián Alberto; Venerus, Leonardo A.; Svendsen, Guillermo

doi:10.1007/978-3-030-86676-1_9

Cited by 11 publications

(10 citation statements)

References 108 publications

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“…Additionally, the data indicates that the shift in prawn composition occurred nine years following below-average river flow, which suggests a potential correlation between river discharge trends and changes in trawl catch composition. Comparable changes have been documented in other regions, where early maturing fish populations dominate as they respond easily to changes (Galván et al, 2022;Levine et al, 2023). For example, in the Pacific Arctic, where the water temperature is increasing and salinity is reduced due to melting ice (a phenomenon similar to increased river flow), the fish composition is reported to have changed (Levine et al, 2023), a comparable effect to fish composition change in the prawn fishery of Tanzania.…”

Section: Discussionmentioning

confidence: 81%

River discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania

Silas,

Mgeleka,

Kangwe

2023

WIO J. Mar. Sci.

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This study examined the relationships between river discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania. Key assumptions were that river discharge would be a good indicator of rainfall and that the number of fishing vessels would reflect fishing intensity. We investigated whether reduced river discharge or increased fishing effort caused the collapse of the industrial prawn fishery in 2007, and which of these factors delayed recovery prior to reopening the fishery in 2017. The analysis showed a positive relationship between Catch Per Unit Effort (CPUE) and river discharge, with decreased river flow resulting in reduced prawn catches. The number of fishing vessels had little impact on CPUE before 2003, but thereafter CPUE declined even when fishing effort was reduced by 50%. A shift in trawl catches from a prawn-dominated fishery to a fish-dominated fishery was observed four years before the collapse. The trend in river discharge persisted below average (22 m³/s) between 2000 and 2007. Forewarning of low river discharge, changing trawl catch composition, and increasing effort may have led to developing proactive strategies to minimise the impact of a changing regime on fish stocks and dependent communities. We recommend establishing a monitoring system to anticipate similar events in the future.

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Section: Discussionmentioning

confidence: 81%

River discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania

Silas,

Mgeleka,

Kangwe

2023

WIO J. Mar. Sci.

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“…This warming allows marine fish and other species to colonize higher latitudes and/or for migratory species to display a more extended residency in regions sub-optimally cold in the winter (Franco et al, 2020). For example, an increase in fish richness was driven by an influx of species from warmer waters in Northern and Central Patagonia (Galván et al, 2021). The tropicalization of temperate waters is an ongoing global phenomenon that has impacted sea surface temperatures to 48ºS latitude (Galván et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…For example, an increase in fish richness was driven by an influx of species from warmer waters in Northern and Central Patagonia (Galván et al, 2021). The tropicalization of temperate waters is an ongoing global phenomenon that has impacted sea surface temperatures to 48ºS latitude (Galván et al, 2021). Furthermore, in the last five decades, increased anthropogenic CO2 has altered the chemical conditions of the Argentine Basin, with all depths displaying ocean acidification (Fontela et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Ocean acidification and seasonal temperature extremes combine to impair the thermal physiology of a sub-Antarctic fish

Lattuca

Vanella

Malanga

et al. 2023

Science of The Total Environment

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“…Dules auriga is considered a rare species in shallow environments of the study area. However, its frequency of occurrence has increased and its distributional range expanded to the Southern Patagonian region (Galván et al, 2009, 2022). We found that its early stages are relatively common in samples from the SJG during the austral summer (Villanueva Gomila et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Development and Occurrence of Early Stages of Dules auriga in the Northern Patagonian Gulfs of Argentina

Villanueva-Gomila,

Diez,

Venerus

et al. 2023

Ichthyology & Herpetology

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The family Serranidae comprises a large group of marine fishes distributed worldwide. The identification of early stages of serranids at the species level is difficult due to a high family diversity and to overlapping morphological and meristic features. In this study, we describe morphological and meristic features of early stages of Dules auriga and summarize density and distribution data for larvae collected in the San José Gulf, Península Valdés, Argentina. Larvae were distinguished by relevant morphological features that include opercular complex development, meristic features, pigmentation pattern, the sequence of appearance of fin elements, and the structure of the caudal region, typical of serranids. The elongated third dorsal spine, characteristic of adult D. auriga, was not observed. Two preflexion larvae were identified using COI barcoding to confirm the species identity. Morphological features described here helped to discriminate D. auriga from other serranids occurring in the area and enabled reconstruction of the entire developmental series and linkage between early stages and adults.

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Changes in the Specific and Biogeographic Composition of Coastal Fish Assemblages in Patagonia, Driven by Climate Change, Fishing, and Invasion by Alien Species

Cited by 11 publications

References 108 publications

River discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania

River discharge, fishing effort and catch composition of prawn fisheries in coastal Tanzania

Ocean acidification and seasonal temperature extremes combine to impair the thermal physiology of a sub-Antarctic fish

Development and Occurrence of Early Stages of Dules auriga in the Northern Patagonian Gulfs of Argentina

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