Effects of habitat and food resources on morphology and ontogenetic growth trajectories in perch

摘要: Studies on resource polymorphism have mainly been considered at the end stage of ontogeny, whereas many species undergo diet changes as they grow. We conducted a field survey to analyze role adaptive variation during ontogeny in Eurasian perch (Perca fluviatilis). caught from littoral and pelagic zones lake investigate whether differ morphology between these habitats. also investigated there were any differences morphological trajectories collected two found that habitat, independently size, had deeper body, larger head mouth longer fins than zone. Macroinvertebrates fish dominated perch, consisted zooplankton some extent fish. Independently more streamlined individuals proportion smaller macroinvertebrates their deeper-bodied individuals, indicating relation morphology. Some characters followed different ontogenetic habitats; e.g. body faster perch. The relationship length size differed habitats, where increase pelvic fin area increased with Our findings show habitats differs way corresponds functional expectations for occupy