Diel vertical migration patterns in juvenile cod from the Skagerrak coast

Marine Ecology Progress Series

Esben Moland Olsen¹  Nils Christian Stenseth¹  Sigurd Heiberg Espeland¹  Adine Guldborg Thoresen¹  Jakob Gj#xf8s#xe6ter¹  Halvor Knutsen¹  Leif Christian Stige¹ 

关键词: Diel vertical migration;    DVM;    Generalized additive models;    GAM;    Coastal cod;    Gadus morhua;   

DOI  :  10.3354/meps08524

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: We demonstrated a clear year-round diel vertical migration pattern (DVM) of small (26 to 45 cm) Skagerrak coastal cod Gadus morhua on a small geographic scale. Generalized additive models (GAMs) were used to make inferences about depth movements from a large data set of repeated depth measurements of cod fitted with acoustical tags. The general pattern in vertical behaviour was closely linked to sunrise and sunset, and the timing varied with the length of the day. The absolute magnitude of vertical movement was seasonally variable and probably influenced by temperature and food availability. Cod constantly selected deeper residence depths during the day than at night, and during winter than in summer. This study uses flexible models to make generalisations of the varying nature of the diel vertical migration patterns in juvenile coastal cod.

【 授权许可】

Unknown