Fisheries Oceanography最新文献

Areas along the US continental shelf that have been designated for extensive offshore wind farm installations over the coming decades overlap with regions that support economically important fisheries. These fisheries are undergoing changes in distribution in response to warming ocean water temperatures. The combination of expanding offshore wind energy infrastructure and changing environmental conditions presents new challenges for these offshore fisheries. The contributions in this special issue consider responses of habitat, biology, and socio-economic aspects of commercial and recreational fisheries to the coincident stressors of changing oceanographic conditions, climate change, and development of offshore renewable energy. The synthesis of the current state of understanding at the nexus of these interactions provided by these contributions points to areas of research needed to advance co-existence of fisheries with expanded use of the offshore ocean environment that is undergoing rapid environmental change.

Climate change is causing significant changes in maritime habitats, altering the distribution of marine organisms and potentially leading to poleward migration of species, impacting fishing operations and coastal communities' subsistence methods. The present study analyzed the distribution of the Indian Ocean immature albacore tuna (Thunnus alalunga) by using an ensemble modeling approach and considering three representative concentration pathway (RCP) scenarios (2.6, 4.5 and 8.5) to assess the implications of predicted climate change. Three species distribution models (generalized additive modeling, boosted regression tree, and random forest) incorporating various oceanographic parameters were used as inputs to create an ensemble model that replicated the immature albacore distribution. The study period revealed that the distribution of immature albacore tuna was primarily concentrated between 28°S and 34°S in the Indian Ocean. The findings indicated a substantial disparity in the distribution of immature albacore tuna by the year 2100, with RCP 8.5 showing a notable contrast to RCP 2.6. The projected distribution range under RCP 8.5 is expected to significantly change by 2100, with an estimated range of 38°S–41°S, compared to 30°S–34°S under RCP 2.6. By integrating these outcomes into managerial strategies, decision-makers can make informed decisions that not only protect the other fisheries of the Indian Ocean but also safeguard the livelihoods of the people who rely on them in the face of changing climatic conditions.

Climate change is causing significant changes in maritime habitats, altering the distribution of marine organisms and potentially leading to poleward migration of species, impacting fishing operations and coastal communities' subsistence methods. The present study analyzed the distribution of the Indian Ocean immature albacore tuna (Thunnus alalunga) by using an ensemble modeling approach and considering three representative concentration pathway (RCP) scenarios (2.6, 4.5 and 8.5) to assess the implications of predicted climate change. Three species distribution models (generalized additive modeling, boosted regression tree, and random forest) incorporating various oceanographic parameters were used as inputs to create an ensemble model that replicated the immature albacore distribution. The study period revealed that the distribution of immature albacore tuna was primarily concentrated between 28°S and 34°S in the Indian Ocean. The findings indicated a substantial disparity in the distribution of immature albacore tuna by the year 2100, with RCP 8.5 showing a notable contrast to RCP 2.6. The projected distribution range under RCP 8.5 is expected to significantly change by 2100, with an estimated range of 38°S–41°S, compared to 30°S–34°S under RCP 2.6. By integrating these outcomes into managerial strategies, decision-makers can make informed decisions that not only protect the other fisheries of the Indian Ocean but also safeguard the livelihoods of the people who rely on them in the face of changing climatic conditions.

Predicting changes in the spatial distribution of marine resources under climate change (CC) is key for sustainability, since some species may change their historical fishing zones and/or the spatial boundaries set for managing fisheries. Chile is a leading country in fishing landings and products (e.g., fish oil and fishmeal). This productivity is influenced by the Humboldt Current, one of the most important upwelling systems. Although 70% of pelagic and demersal landings are caught in central-southern Chile (32° S–42° S), little is known about the impacts of CC on this ecosystem. Thus, we modelled the habitat suitability (HSM) for the main stocks in the area: anchovy, common sardine, Chilean hake, yellow prawn, carrot prawn and nylon shrimp. We projected the HSM for each species considering ocean abiotic conditions from 2040 to 2050 using Social Shared Pathways scenarios (SSP1, SSP2 and SSP5) from Bio-Oracle. HSM exhibited high performance in predicting the current spatial variability for the six species. The CC projections indicated significant changes in the spatial distribution of all species (i.e., reduction in size, poleward shift, and deepening of core habitat), especially in common sardine, anchovy and carrot prawn. In the long term, these changes may affect the latitudinal boundaries set for managing fisheries, the design of stock assessment and catch monitoring programs, and fishing effort/costs in each fleet. These findings will help decision-makers, researchers and users to visualise the potential impacts of future environmental variability on the southern Humboldt ecosystem and to design plans and actions to adapt the management of Chilean fisheries to CC.

Predicting changes in the spatial distribution of marine resources under climate change (CC) is key for sustainability, since some species may change their historical fishing zones and/or the spatial boundaries set for managing fisheries. Chile is a leading country in fishing landings and products (e.g., fish oil and fishmeal). This productivity is influenced by the Humboldt Current, one of the most important upwelling systems. Although 70% of pelagic and demersal landings are caught in central-southern Chile (32° S–42° S), little is known about the impacts of CC on this ecosystem. Thus, we modelled the habitat suitability (HSM) for the main stocks in the area: anchovy, common sardine, Chilean hake, yellow prawn, carrot prawn and nylon shrimp. We projected the HSM for each species considering ocean abiotic conditions from 2040 to 2050 using Social Shared Pathways scenarios (SSP1, SSP2 and SSP5) from Bio-Oracle. HSM exhibited high performance in predicting the current spatial variability for the six species. The CC projections indicated significant changes in the spatial distribution of all species (i.e., reduction in size, poleward shift, and deepening of core habitat), especially in common sardine, anchovy and carrot prawn. In the long term, these changes may affect the latitudinal boundaries set for managing fisheries, the design of stock assessment and catch monitoring programs, and fishing effort/costs in each fleet. These findings will help decision-makers, researchers and users to visualise the potential impacts of future environmental variability on the southern Humboldt ecosystem and to design plans and actions to adapt the management of Chilean fisheries to CC.