BIS 2B Lecture Notes - Lecture 34: Liatris, Serpentine Soil, Anthropocene

• School: UC-Davis
• Department: Biological Sciences
• Course: BIS 2B
• Professor: Schreiber, Sebastian

Document Summary

Greenhouse gas, climate warming, sea level rising. More co2 = acidic, less aragonite, less calcification/more prone to dissolutions. Industrial n-fixation (haber process) alters n cycle. Long term rate of extinction has gone up over time. Ballpark estimates hint that we might be on track to extinction, Declining pop numbers and size but not enough info. Trends in pop abundance for 4658 pops of 1678 terrestrial species. Population has a finite number, in small populations = low number fluctuation could eliminate them. Below allee threshold: positive density dependence tends towards extinction. Small pops more likely to go extinct. Pops fewer than 12 individuals went extinct; substantial amt of fewer than. Large animals the larger, the more at risk. Only one spot where they grow particularly at risk. Greater on the west coast, decreases going up higher. Endemic species greater when area is greater. Few endemic species in prev. glaciated areas. All pops on one river, at risk of catastrophic flooding, etc.