Relationship between the vertical water temperature and the habitat distribution of jumbo flying squid Dosidicus gigas off Peru

ZHU Guizhong; FENG Zhiping; YU Wei; CHEN Xinjun

doi:10.13984/j.cnki.cn37-1141.2025.01.015

Abstract：As one of the economically important cephalopods with obvious diurnal vertical migration characteristics,the jumbo flying squid Dosidicus gigas abundance and habitat distribution are largely affected by the change of vertical water temperature in the habitat.In this study,the maximum entropy model was used to select the water temperature at the depths of the key water layers in each months ac-cording to the contribution rate,using the fisheries data of Dosidicus gigas off Peru from January to December during a period from 2006 to 2015 and the water temperature data at different water layers(0,50,100,150,200,300,400,500,750,1000 m).According to the response curves of this squid to key water temperature factors,we further obtained the suitable temperature range at the key water layers in each months,analyzed the monthly variations in the water temperature factors at the key wa-ter layers,and identified the potential habitat distribution map in peak fishing season(September to February).The results showed that the water temperature factors at the key water layers in each months strongly affected the temporal and spatial distribution of squid habitat off Peru,especially the water temperature at the depths of 0,50,100,150 m co ntributed the main impacts.The suitable wa-ter temperature range at the key water layers changed from month to month.The temporal and spatial distribution of the potential habitat of D.gigas was consistent with the movement of the longitudinal and latitudinal gravity centers of the fishing ground.Both moved southwestward with the month.Our findings suggested that the habitat of D.gigas off Peru sea was affected by the water temperature a-bove the depths of 150 m,and the temporal and spatial distribution of the habitat could be well modeled using the vertical water temperature between 0 and 150 m.