AGR 2320 Lecture Notes - Lecture 27: Microfauna, Annelid, Mollusca
14 Nov 2016
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Agr 2320 lecture 27 soil organisms. Heterotrophs: carbon from organic material: herbivores subsist on living plants, detritivores subsist on dead plants, predators subsist on animals, fungivores subsist on fungi, bacterivores subsist on bacteria, parasites live off other organisms. Annelida (earthworms: burrowing will improve porosity. Preferential flow: mixing of organic matter. Nematodes: estimated that there may be more than 500 000, ubiquitous found in antarctica, ocean trenches. Actinomycetes: bacteria but fungal attributes, makes the distinct soil-type smell. Blue green algae (cyanobacteria: contain chlorophyll, capable of fixing atmospheric n, eutrophication, autotrophic. Interaction between fungi in the plant: symbiosis that can improve plant nutrient uptake, plant infected by the fungi, fungi grows hyphae and acts as a physical extension in the root system. Very tiny roots and can reach places that the plant can"t reach. Increased availability of hard to reach nutrients like phosphorous. Bacteria like (single celled with no nuclear membrane) with fungal attributes (network of filaments)
