Impacts of Fishing on Target Populations - Life History Characteristics Altered

Madison Burt
Mind Map by Madison Burt, updated more than 1 year ago
Madison Burt
Created by Madison Burt about 6 years ago
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BSc Degree Marine Biology (218 - Human Impacts) Mind Map on Impacts of Fishing on Target Populations - Life History Characteristics Altered, created by Madison Burt on 03/29/2014.

Resource summary

Impacts of Fishing on Target Populations - Life History Characteristics Altered
1 Younger individuals more fecund than previously, may also grow faster. Population able to adapt somewhat.
2 Fishing size selective so can alter size and age structure of a population - mesh size - smaller individuals can escape.
3 Size selection can result in sexual selection. Alter sex ratio as females tend to be bigger - more tropical.
4 Life span cut short so full reproductive output not realised. Bigger individuals = more eggs & so more offspring
5 Decrease in genetic diversity - less fitness - less able to adapt to change
6 Smaller overall body size favoured - higher chance of escaping.
7 Sexual maturity at a younger age favoured - these pass on DNA. Ones who mature older don't
8 Evolutionary changes
9 Selective removal - selecting particular haplotypes - genetic selection
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