Week 12- Climate Change
Week 12- Climate Change Biology 152
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This 3 page Class Notes was uploaded by BettyAnn Mead on Monday May 4, 2015. The Class Notes belongs to Biology 152 at University of Massachusetts taught by Peteh in Winter2015. Since its upload, it has received 56 views.
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Date Created: 05/04/15
Biological Effects of Climate Change 0 Increased C02 0 Changes in climate Changes in Ocean Chemistry Ocean Acidi cation 0 Increase C02 in atmosphere it will increase in ocean water 0 C02 in water changes to an acid which decreases the pH of the water 0 C02 H20 l CARBONIC ACID 0 As pH decreases this impacts organisms that build parts of their bodies with calcium carbonate Since 1850 s 0 30 increase in ocean acidity 100x faster change then last 20 million years Does it have an affect Lab experiments show impacts on calcareous animal growth immune response and reproduction Lab experiments show shell and coral deterioration at lowered pH 0 Areas of ocean that naturally have lower pH have fewer organisms that have structures made of calcium carbonate 0 Parts of the ocean that composition of plankton species Reefs where pH has declined have exhibited coral thinning Climate Change Biology 0 Increasing temperatures can make an area either less or more suitable for a given species Responses to Physiological Stress Stay in place 0 Global or local extinction o Acclimation o Adaptation 0 Move 0 Dispersal Thomas et al Nature Jan 2004 0 Estimate species climate envelope will not evolve signi cantly in 50 years 0 Model with and without species based dispersal Model three climate scenarios 0 Range of extinction values from 18 to 35 o Other studies predict up to 75 biodiversity loss Which species are most likely to adapt Those with short generation times 2 years or less Dispersal Dispersal rate 0 Presence of dispersal agent 0 Availability of suitable habitat 0 Different species move at different rate This can disrupt ecological interactions and have a ripple effect through a community Latitudinal Shifts o Majority of North American birds have shifted ranges to the north in last 30 years 0 235 kilometersyear o Majority of British birds have shifted ranges to north 0 Wide geographic distribution of patterns implicates climate change Climate Change Effects 0 Habitat loss 0 Life Cycle Timing Cycles of activity and dormancy Reproduction Timing Solution to Climate Change Conservation Impacts o Mitigation o Decrease atmospheric inputs of C02 Adaptation 0 Conventional conservation approaches 0 Migration corridors o Assisted migration What is the risk of decline or extinction due to AGW 0 Low 0 Business as usual 0 Moderate 0 Improve connections to higher latitude habitats conservation corridors o Enhance gene pool with quotwarmquot genes 0 Reduce local stressors 0 High High Risk Is it feasible to translocate No 0 Create habitat at higher latitudes 0 Can t create habitat store genes 0 Yes 0 Will they move on their own Yes then wait for them and help when they get there No determine if bene ts outweigh costs of translocation
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