LIFESCI 1 Lecture Notes - Lecture 27: Competitive Exclusion Principle, Niche Differentiation, Natural Selection
Document Summary
Instructor: tonya kane: niche multidimensional habitat = allows a species to live and its job. Determined by abiotic/physical environment and biotic/other species: adaptations enable different species to coexist. Exploiting different combinations of resources: resource partitioning = result of competition for space and resources. May overlap = need to diverge to minimize overlap. Permits the individuals in a species to live. But many species don"t occupy all habitats even if they can. Species compete, prey on organisms, or influence reproduction. Reduces range actually occupied = realized niche. Interspecific competition = determine size of realized niche. Between different species: symbioses = close interactions between species that have evolved over a long time. Can enhance reproduction and population growth of both partners: mutualism = mutually beneficial interactions, one-sided interactions = consume one another/competes. Antagonisms = lose more than it gains: costs (physical resources) and benefits (reproduction) Ratio of cost/benefit = determines whether mutualistic or antagonistic relationship.
