Occurrence and behavioral rhythms of the endangered Acadian redfish (Sebastes fasciatus) in the Sambro Bank (Scotian Shelf)

Frontiers in Marine Science

Marine Science

Ulrike Hanz¹  Corrado Costa²  Ellen Kenchington³  Furu Mienis⁴  Jordi Grinyó⁴  Jacopo Aguzzi⁵ 

[1] Bentho-Pelagische Prozesse (BPP), Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany;Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria (CREA) – Centro di ricerca Ingegneria e Trasformazioni agroalimentari, Monterotondo, Italy;Department of Fisheries and Oceans, Ocean Ecology Section, Bedford Institute of Oceanography, Dartmouth, NS, Canada;Department of Ocean Systems, Royal Netherlands Institute for Sea Research (NIOZ), Den Burg, Netherlands;Department of Renewable Marine Resources, Institut de Ciències del Mar (ICM- Spanish National Research Council), Passeig Maritim de la Barceloneta, Barcelona, Spain;Department of Research Infrastructures for Marine Biological Resources, Anton Dohrn Zoological Sation, Naples, Italy;

关键词: Sebastes;    rockfish;    behavior;    rhythms;    habitat use;    environmental drivers;    lander;    monitoring;   

DOI  :  10.3389/fmars.2023.1158283

 received in 2023-02-03, accepted in 2023-04-03,  发布年份 2023

来源: Frontiers

【 摘 要 】

The genus Sebastes is a morphologically and ecologically diverse genus of rockfish characterized by high longevity, late-maturity and low natural mortality. On the northwest Atlantic continental shelf, the Acadian redfish (Sebastes fasciatus) is the most common rockfish species above 300 m depth. This species has been widely exploited resulting in the depletion or collapse of most of its stocks. Management of long-lived species with intricate life-history characteristics is challenging and requires highly integrated biological and oceanographic monitoring, which allow the identification of environmental drivers and demographic and behavioral trends. The present study uses high-temporal resolution imaging and environmental data, acquired with an autonomous lander deployed for 10-months at the Sambro Bank Sponge Conservation Area (Scotian Shelf) to elucidate S. fasciatus temporal dynamics and behavioral trends in response to near-bed environmental conditions. S. fasciatus, mostly displayed passive locomotion and static behaviors, in common with other shelf-dwelling Sebastes species. Structural complexity provided by sponges positively influenced S. fasciatus presence. Fish used sponges to avoid being dragged by bottom currents. Hydrodynamics appear to act as a synchronizing factor conditioning its swimming behavior. S. fasciatus total counts exhibited a seasonal shift in rhythm’s phase likely reflecting changes in lifestyle requirements. This study provides new insights on S. fasciatus dynamics and behavior. Nonintrusive monitoring approaches, such as the one used in this study, will be key to monitor this threatened species populations. Especially, since it is expected that S. fasciatus will experience distribution shifts to higher latitudes due to future climate stressors.

【 授权许可】

Unknown   
Copyright © 2023 Grinyó, Aguzzi, Kenchington, Costa, Hanz and Mienis