VARIABILI ECOLOGICHE E LORO EFFETTO SULLA FAUNA ACQUATICA

摘要: ABSTRACT It is well known that direct and indirect interrelations exist between physical chemical variables of the environment structure biological aquatic communities, from a qualitative quantitative point view. The nature connections most suitable way to prove their validity should be demonstrated. necessary recall each water-body, both running or standing, has its own natural characteristics, mainly depending on drainage basin which it belongs. Anyway, basic classification consists in considering separately waters lakes. Even if we have deal with water bodies pertaining same geological climatical area, hydrological, differentiation strictly determined by parameter fundamental importance: time renewal, involves series consequences, some them still not completely clear. ecological pattern now disturbed impact man. whole ecosystem may modified through two processes, can identified effect as “eutrophication” input “persistent” substances. These processes affect, directly indirectly, animal communities respond modifications densities specific composition. Methodological approaches are discussed attempt reach reasonable interpretation causes disturbance effects ecosystems.