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Humans and Global Change: Major Trends in population
Decline in biodiversity far exceeds natural conditions
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Anthromes
- Anthropogenic biomes
- Represent the global ecological patterns created by sustained direct human interactions with ecosystems
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Climate Change: Main factors driving current change
- Anthropogenic production of greenhouse gases as the primary factor to global warming
- CO2
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Approximate average temperature by 2100
4o Celsius
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Variability in space and time:
- Climate change is uneven throughout time in years, seasons, and times of day.
- It is also uneven in latitudes and elevation.
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Land cover change in composition
Invasive species and ocean acidfication
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Land Cover Change in configuration/fragmentation
- Habitat destruction and fragmentation is creating habitat islands on what was once mainland (increased isolation)
- Reduction in total area, resources, and productivity
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Linnean Shortfalls
What is out there is unknown to us. Refers to our lack of knowledge about how many, and what kind of species exist
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Wallacean
Refers to our inadequate knowledge of the distribution of species.
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Range Collapse
- Early views predicted that ranges would collapse toward the center
- In actuality, populations near the parameter are most vulnerable to extinction or in isolated portions of the range.
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How can biogeography contribute to understanding problems and solutions?
- Conservation planning and assigning urgency towards biodiversity loss.
- – Geography of global change and threat
- – Geography of extinction and threatened taxa
- – Linnaean and Wallacean shortfalls Improving understanding of processes that maintain and threaten biodiversity
- – Range collapse
- – Studies in biotic invasion
- Contributing to solutions
- – Conservation planning and triage
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Biotic Invasions- Biodiversity loss
- The earth has endured waves of extinction and diversification.
- Other changes can be no less important, such as invasive species (which we’ve covered a bit already) and ocean acidification (which we have not but may be one of the biggest change of them all)!
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