Using rainbow wrasse as a model species, we evaluate the impact of protection on the relationship between body size and: i) trophic position (TP), based on δ¹⁵N; and ii) body condition (BC), based on weight-at-length. We found that the biomass of the rainbow wrasse, their predators and their competitors was higher inside the no-take marine protected area (NTA) than in the area open to fishing. The TP of rainbow wrasse was higher inside the NTA but the BC was lower. A domed relationship between TP and size was observed in both areas: the TP increased with size up to 12.6 cm total length, when all individuals shifted to terminal males, and then decreased. Although other confounding environmental variables may exist, the indirect effects of fishing on competition and predation risk are the most likely explanation for the changes in TP, BC and the ontogenetic dietary shift of the rainbow wrasse.

使用彩虹濑鱼作为模式植物，我们评估保护对车身尺寸之间的关系的影响：1）营养位置（TP），基于δ ¹⁵N; ii）基于身高体重的身体状况（BC）。我们发现，在非捕捞海洋保护区（NTA）内，彩虹濑鱼，其捕食者和其竞争者的生物量高于开放捕鱼区。NTA内部虹鳟的TP较高，但BC较低。在两个区域都观察到TP和大小之间的圆顶关系：当所有个体转移到末端雄性，然后减小时，TP随总长度的增加而增大，直至总长12.6 cm。尽管可能存在其他令人困惑的环境变量，但捕鱼对竞争和捕食风险的间接影响最可能解释了TP，BC的变化以及彩虹濑鱼的个体遗传饮食变化。