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Some notes on tolerance curves and the ecological niche

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Presentation on theme: "Some notes on tolerance curves and the ecological niche"— Presentation transcript:

1 Some notes on tolerance curves and the ecological niche

2

3 Short-term shifts – physiological “adaptation”
Seasonal changes – acclimatization Developmental changes (E. Werner (1984)) “ontogenetic niche”

4 Wilson’s warbler summer distribution

5 Wilson’s warbler winter distribution

6 Physiological “acclimatization” or “adaptation”
Acclimatization effects on final rectal temperature, heart rate, and sweat rate, for a group of men exposed daily to 2 hr of hard work in a hot environment. (after Leithead CS, Lind AR. Heat Stress and Heat Disorders Philadelphia, Pa.: FA Davis Co, 304)

7 EMILI GARCÍA-BERTHOU Ontogenetic Diet Shifts and Interrupted Piscivory in Introduced Largemouth Bass (Micropterus salmoides) Internat. Rev. Hydrobiol –363

8 A graphical representation of the niche (sensu Hutchinson).

9 Fundamental niche – full range of environmental conditions, biological and physical, under which a species can exist. Stable population size or growth Realized niche – that aspect of the hypervolume to which a species is most highly adapted.

10 Blue-grey gnatcatchers
2-dimensional feeding “niche” fundamental


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