Module 5: Some Modern Biotic Responses to Climate Change
Summary
In this module, students explore biotic responses to changing climate. The module steps through different styles of response (i.e. stasis, adaptation, extinction) and provides examples of each from modern biota. Students are given a set of exercises where they create a hypothesis about future changes to mammal distribution using the Neotoma Explorer.
Learning Goals
- Gain knowledge about biotic responses to climate change.
- Learn about specific examples of these responses.
- Make predictions about future mammal distributions.
Context for Use
Description and Teaching Materials
Students are given background information and then asked to answer a series of questions in order to assess their comprehension of the material. The exercises in this module require that students use the online Neotoma Explorer. If they have problems with the exercises, they should reread the material, use references that are provided, or be facilitated by an instructor.
Module 5: Some Modern Biotic Responses to Climate Change (Microsoft Word 2007 (.docx) 3.6MB Jul5 18)
Teaching Notes and Tips
There are five primary responses for a species to climate change (stasis, macroevolution, microevolution, dispersal, and extinction). Examples of each of these responses is provided in this module. Dispersal, however, is the primary focus here because it has been, and will probably be, the most prevalent response in the late Quaternary and future climate changes. It is important to distinguish between dispersal and migration that are frequently used incorrectly as synonyms. Migration is a seasonal movement whereas dispersal is movement to an area of favorable habitat and colonization of an area. Dispersal can be detrimental to a species at times. For example, because polar bears (Ursus maritimus) are being forced inland by the disappearance of sea ice, they are coming into contact with brown bears and interbreeding. This dilutes the genomes for both species and can be particularly catastrophic if the hybrids are fecund. Although not discussed in this module, diseases or parasites can be spread from one species that is relatively immune to another species that does not have immunity to the pathogen. A situation like this is occurring with the northern dispersal of white tail deer (Odocoileus virginianus) that carries the nematode parasite Parelaphostrongylus tenuis into the range of the moose (Alces alces) which have a much lower resistance to the parasite and therefore higher fatalities.
Assessment
Quizes
Write a discussion differentiating between dispersal and migration.
Write a discussion about the differences between microevolution and macroevolution and exlain why macroevolution is probably not relevant for future climate change.
References and Resources
Resources
http://labs.russell.wisc.edu/pauli/climate-change-and-snowshoe-hares/
http://evolution.berkeley.edu/evolibrary/news/090501_climatechange
https://www.youtube.com/watch?v=DRZ_PD7e3XA
https://www.youtube.com/watch?v=v9i2WYS60L4
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