期刊
ICES JOURNAL OF MARINE SCIENCE
卷 78, 期 9, 页码 3254-3264出版社
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsab191
关键词
chub mackerel; condition factor; growth; Japanese sardine; population density; temperature
资金
- Japan Fisheries Research and Education Agency
- Fisheries Agency of Japan
The study revealed that the abundance of conspecifics and heterospecifics negatively impacts the body condition and growth of chub mackerel, with direct effects likely playing a more significant role than indirect effects.
The density dependence of growth and body condition have important impacts on fish population dynamics and fisheries management. Although population density affects habitat selection, which in turn changes habitat temperature, how this affects growth and body condition remains unclear. Here, we investigated annual changes in body condition, habitat temperature, and cohort-specific growth of chub mackerel (Scomber japonicus) in the western North Pacific and examined quarterly changes in the density dependence of body condition. We hypothesized that chub mackerel body condition is affected both directly (e.g. through competition for food) and indirectly (through changes in habitat temperature) by the abundance of both conspecifics (i.e. chub mackerel) and heterospecifics (the Japanese sardine Sardinops melanostictus). Indeed, chub mackerel body condition, habitat temperature, and growth all decreased with increasing conspecific and heterospecific abundance. Mean annual growth rates in chub mackerel were positively corelated with body condition. The final model showed that conspecific and/or heterospecific abundance had strong negative effects on chub mackerel body condition in all seasons, and influenced habitat temperature through habitat selection in some seasons. By contrast, temperature effects on body condition were weak. Therefore, direct effects likely have more impact than indirect effects on density-dependent body condition and growth.
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