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Microhabitat-scale influences of resources and refuge on habitat selection by an estuarine opportunist fish

机译：资源和避难所对栖息地选择的微观栖息地影响

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We examined how the marine cottid fish Clinocottus acuticeps used vegetated micro-habitats within an estuarine system in the Pacific Northwest, USA. C. acuticeps was more abundant and grew faster in microhataitats in algal beds compared with open microhabitats. Furthermore, the condition index (CI) increased in vegetated microhabitats and decreased in open habitats which, combined with the variability in growth measured in both habitats, suggests that fish may regulate their growth more narrowly when food resources and protective cover provided by the algal bed function as complementary resources. Reduced growth in open microhabitats may be a physiological response to increased predation risk. Additionally, giving-up densities (GUDs) were similar in both habitats, in both field and laboratory experiments, where fish foraged in the presence of predators and under different levels of protection by algae. These results, combined with the implications of the growth experiments, suggest that C. acuticeps utilizes a risk-reckless strategy in the face of a tradeoff between food and safety by maximizing food intake despite predation risk. Nevertheless, we maintain that the increased growth and lower predation risk associated with algae microhabitats imply that, ultimately, fitness may be higher in individuals that primarily use vegetated habitats.
机译：我们研究了美国海洋西北鱼类在海洋西北部的河口系统中如何使用带藻类的微生境。与开放的微生境相比，藻类床中的微hat在更丰富的C. acuticeps处生长更快。此外，植被微生境中的条件指数（CI）升高，而开放生境中的条件指数（CI）下降，再加上两个生境中所测得的生长变异性，表明当藻类床提供食物资源和保护性覆盖物时，鱼类可能更狭窄地调节其生长作为补充资源。开放式微生境生长的减少可能是对捕食风险增加的生理反应。此外，在野外和实验室实验中，在两个生境中的放弃密度（GUD）都相似，在有掠食性动物存在和不同水平的藻类保护下，鱼类觅食。这些结果与生长实验的含义相结合，表明，尽管有捕食风险，但由于食物和安全性之间存在取舍，因此C. acuticeps利用了鲁risk的策略，以最大程度地摄取食物。然而，我们认为藻类微生境带来的生长增加和捕食风险降低，这意味着，最终，主要使用植被生境的个体的适应性可能更高。

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