690844
Description
Mind Map by Madison Burt, updated more than 1 year ago
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Created by Madison Burt
over 10 years ago
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Impacts of Fishing on
Ecosystems & Trophic
Structure
- Changes in fish communities (inc. benthic)
- Changes in community
structure - k vs r selected
- Changes in diversity -
some species more
vulnerable to fishing
- Changes in community
structure - k vs r selected
- Large size top piscivorous predators
more valuable - lower value smaller
herbivorous species
- Reflected in global landings statistics
- Fishing down the food web
- Reflected in global landings statistics
- Reduction in predatory pressure
leads to increase in prey
populations (if top down)
- Spiny lobster couldn't control urchins
anymore due to being heavily fished.
Explosion of urchins, so doesn't allow kelp to
regrow after winter storms.
- Keystone species - ecosystem forming
species - potential loss of whole
ecosystem
- Spiny lobster couldn't control urchins
anymore due to being heavily fished.
Explosion of urchins, so doesn't allow kelp to
regrow after winter storms.
- Reduction in competitive pressure
- Increase in competitive species
- E.g. Jellyfish population in Black Sea
- E.g. Jellyfish population in Black Sea
- Dramatic shifts in
community structure
- Increase in competitive species
- Local organic enrichment -
discards and trawler damaged
animals
- Increases in scavenging species
- E.g. crabs
- E.g. crabs
- Anoxia - not a
massive issue
- Increase in seabird numbers
- Some species benefit by
feeding on discards
- Some species benefit by
feeding on discards
- Increases in scavenging species
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