BIOL 1020H Chapter Notes - Chapter 47: Keystone Species, Coevolution, Trophic Level
Document Summary
**remember that niche and habitat cannot be used interchangeably** The realized nice of a species is more restricted than its fundamental niche. The competition between species can determine the size of the realized niche: niches are shaped by evolutionary history. Phylogenetic niche conservatism: the observed similarity in closely related species of some aspect of their niches, indicating its presence in their common ancestor. 47. 2 antagonistic interactions between species (pg. 1023-1028: many interactions are one-sided, one loses more than it gains. Limited resources lead to competition (cid:862)struggle for e(cid:454)iste(cid:374)(cid:272)e(cid:863) results i(cid:374) (cid:374)atural sele(cid:272)tio(cid:374) as spe(cid:272)ies e(cid:448)olve to survive and reproduction to reduce competition. Competitive exclusion can prevent two species from occupying the same niche at the same time. Examples of one-sided interactions are: predation, when one species consumes the other, parasitism, whe(cid:374) parasites (cid:272)o(cid:374)su(cid:373)e their hosts" tissues as (cid:374)utrie(cid:374)ts (cid:271)(cid:455) li(cid:448)i(cid:374)g i(cid:374) (cid:272)lose asso(cid:272)iatio(cid:374) with the specie(s, do(cid:374)"t kills hosts, (cid:271)ut redu(cid:272)es their fit(cid:374)ess, herbivory.
