BIO 112 Lecture Notes - Lecture 9: Nautical Mile, Chestnut Blight, Orange Roughy
Document Summary
Direct economic value: agriculture b, forestry b, sheries b, but some directly consumed, potential values (drugs, ethical values, harder to understand: 1800 rural; today 80% urban (us); 50% urban (world) Threats to biodiversity: habitat loss: conversion to agriculture or urban and industrial uses, deforestation, rangeland and grazing practices, aquatic ecosystems, overexploitation: over shing, extinction of species, bushmeat, introduction of exotic species, predator & pest control practices, climate change. Soil already low nutrient, further erodes, more dif cult to regenerate, most will not. Was 14% now 6%, 0. 6% per year loss. Grande, yellow river dry up before reach sea: deforestation- leads to siltation and warming waters. Australia: introduction of diseases to plants (chestnut blight, dutch elm disease, insects: gypsy moth (mature oaks-leaves), asian long-horned beetle (wood, e, us), re ants, European wasp: freshwater ecosystems: zebra mussel, eurasian milfoil, sh spp (great alases-sea lamprey, smelt, carp, alewife, brown trout, salmon)
