EVPP 108 Lecture Notes - Lecture 33: Interspecific Competition, Commensalism, Mycorrhiza

• School: George Mason University
• Department: Environmental Science and Public Policy
• Course: EVPP 108
• Professor: Kim Largen

Document Summary

Ecosystems vary in size: they can be as small as a puddle or as large as the universe itself, any group of living and nonliving things interacting with each other can be considered as an ecosystem. If the population"s needs are not met, it will move to a better habitat. Community: all the populations that live together in a habitat, habitat is the type of place where individuals of a species typically live, type of ha(cid:271)itat shapes a (cid:272)o(cid:373)(cid:373)u(cid:374)ity"s stru(cid:272)ture. Structure: climate and topography, available foods and resources, adaptations of species in community, species interactions, arrival and disappearance of species, physical disturbances. Niche - sum of activities and relationships in which a species engages to secure and use resources necessary for survival and reproduction. Fundamental niche: theoretical niche occupied in the absence of any competing species. Realized niche: niche a species actually occupies, realized niche is some fraction of the fundamental niche.