[ | EBOOK DOWNLOAD :COEVOLUTION | ] Default Design
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hreats to Biodiversity chap 3 Extinction is the most irreversible and tragic of all environmental calamities With each plant and animal species that disappears a precious part of creation is callously erased Michael Soule 2004 Threats to Biodiversity As our numbers climb we expand agricultural conversion import invasive species hunt more species de...
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volutionary Patterns The tropics have long been called a laboratory of evolution because of the extraordinary diversity of species and the complex relationships among its members Evolutionary Patterns 1859 Darwin published On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life Evolution...
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abitat Degradation Loss Habitat Degradation Habitat degradation and loss is the most serious threat to the majority of endangered biodiversity The majority of the earth s land surface 83 has been transformed by humans to some degree About 60 of earth s ecosystems are considered degraded or unsustainable Habitat Degradation Historic current and proj...
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ainforests The rainforest is incredibly complex The rainforest is incredibly productive The rainforest cycles nutrients incredibly quickly The rainforest soils are incredibly fragile Rainforests Productivity the amount of solar radiation sunlight converted by plants into complex molecules such as sugars This is accomplished through photosynthesis C...
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abitat Fragmentation Part II Biological Consequences of Fragmentation Edge Effects One of the best documented effects of fragmentation are edge effects Edge effects have mostly been examined in forests Sunlight and wind alter the micro climate at the forest edge changing which plant species are favored Biological Consequences of Fragmentation In WI...
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alues Ethics Instrumental or Utilitarian Values Ethics Conservation biologists tend to have a skewed perspective of the value of biodiversity and tend to think others share their perspective Because so much of conservation biology lies outside the realm of biology it is in the biologists Values Ethics Environmental philosophers tend to divide value...
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ource Sink Dynamics Source Sink Dynamics Remember all landscapes are heterogeneous at some scale Consequently patch quality is heterogeneous All else being equal individuals occupying superior habitat should have greater reproductive success Source Sink Dynamics Sources are areas or location where local reproductive success is greater than local mo...
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uild Structure Cody 1975 demonstrated that the division of available resources amongst sets of insectivorous birds in shrub grasslands results in the projection upon each resource dimension of almost identical niches within Californian chaparral Chilean matorall and South African machia Guild Structure While a set of resources may be divided by con...
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pecies Richness If exhaustive sampling is possible it is not necessary to estimate species richness However this is frequently not the case Species Richness Rarefaction Rarefaction is a statistical method for estimating the number of species expected in a random sample of individuals taken from a collection It is useful for comparing 2 samples when...
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