IB 105 Lecture Notes - Lecture 15: Noble Beast, The New York Times, Keystone Species
2 Dec 2016
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Energy spent defending, fighting, fleeing, etc. can affect your survival and fecundity. Walleye fish populations are diminishing as climate change warms the waters allowing smallmouth bass to move into more northern ontario lakes, competing for similar food resources and adding walleye young to their menu choices. Smallmouth bass prefer warmer water and the colder northern lakes were historically a deterrent, but that"s changing. Tipping points can be caused by loss of keystone species: when sea otters were removed from the system sea urchins overgrow and kill kelp. Kelp support many fish and other species so the loss of sea otters creates a ing point. We do(cid:374)"t really k(cid:374)o(cid:449) (cid:449)hat (cid:449)ill happe(cid:374) as a result of all the (cid:272)ha(cid:374)ges that (cid:449)e"re (cid:373)aki(cid:374)g a(cid:374)d loss of diversity. Species capital-the value of having high species diversity: genetic capital- the value of having high genetic diversity within a species, many argue that there is inherent value in having more genetic, species and ecosystem diversity.
