ECOLOGY LECTURES 7-10

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  • Created by: m_ghammer
  • Created on: 19-05-18 17:21
geographic mosaic theory of coevolution
coevolutionary hotspots (where the interaction of two species shows coevolutionary selection) are embedded within a matrix of cold spots (selection is non-reciprocal); occurs when there is a genotype (G) x genotype (G) x environment (E) interaction
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mycorrhiza
soil dwelling fungus colonising plant roots, forming a mutualistic association with plants by providing nutrients in exchange for carbon; present in 95% land plants, evolved 450 MYa
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arbuscular mycorrhizae (AM)
form 'little trees' connected by hyphae between root cell walls; the extra-radial mycelium grows into the soil for nutrient uptake
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ectomycorrhizas (woody plants)
form a fruiting body (sporocarp) for reproduction and a mantle around the plant root; in 3% land flora
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carbon (CO2) flux
measure of soil respiration: sink of photosynthesis, occurs rapidly, pathway of carbon transfer to soil; affected by interactions with other organisms - can be measured using an infrared gas analyser (IRGA)
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measure of soil respiration: sink of photosynthesis, occurs rapidly, pathway of carbon transfer to soil; affected by interactions with other organisms - can be measured using an infrared gas analyser (IRGA)
evolved to prevent fungal interactions: forms dauciform roots - carrot-shaped dwellings with many hairs; release citric acid to breakdown nutrients so no need for mycorrhiza
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Brassicaceae (cabbage)
evolved to prevent fungal interactions: produces fungi toxic compounds to inhibit growth
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positive biodiversity effect/over-yielding
occurs when the mixture treatment (i.e. mixture of species a-e) outcompetes the best performing monoculture (e.g. species a)
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Card 2

Front

soil dwelling fungus colonising plant roots, forming a mutualistic association with plants by providing nutrients in exchange for carbon; present in 95% land plants, evolved 450 MYa

Back

mycorrhiza

Card 3

Front

form 'little trees' connected by hyphae between root cell walls; the extra-radial mycelium grows into the soil for nutrient uptake

Back

Preview of the back of card 3

Card 4

Front

form a fruiting body (sporocarp) for reproduction and a mantle around the plant root; in 3% land flora

Back

Preview of the back of card 4

Card 5

Front

measure of soil respiration: sink of photosynthesis, occurs rapidly, pathway of carbon transfer to soil; affected by interactions with other organisms - can be measured using an infrared gas analyser (IRGA)

Back

Preview of the back of card 5
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