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690844
Impacts of Fishing on Ecosystems & Trophic Structure
Descrição
BSc Degree Marine Biology (218 - Human Impacts) Mapa Mental sobre Impacts of Fishing on Ecosystems & Trophic Structure, criado por Madison Burt em 29-03-2014.
Sem etiquetas
218 - human impacts
marine biology
marine biology
218 - human impacts
bsc degree
Mapa Mental por
Madison Burt
, atualizado more than 1 year ago
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Criado por
Madison Burt
mais de 10 anos atrás
40
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Resumo de Recurso
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
Large size top piscivorous predators more valuable - lower value smaller herbivorous species
Reflected in global landings statistics
Fishing down the food web
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
Reduction in competitive pressure
Increase in competitive species
E.g. Jellyfish population in Black Sea
Dramatic shifts in community structure
Local organic enrichment - discards and trawler damaged animals
Increases in scavenging species
E.g. crabs
Anoxia - not a massive issue
Increase in seabird numbers
Some species benefit by feeding on discards
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