BIS2B Notes-4th Lecture.pdf - r e Reasons for loss of function as biodiversity decreases i Selection Effect There is often one dominant species with a

BIS2B Notes-4th Lecture.pdf - r e Reasons for loss of...

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r JV. e. Reasons for loss of function as biodiversity decreases: i. Selection Effect: There is often one dominant species with a large portion of the biomass. We do not want to Jose this "superstar" species. ii. Complementarity: The whole is greater than the sum of the ecosystem's parts. We need all the parts to support the biodiversity. f. Example: Timber in the Sierra Nevada Forests i. 500 years ago at 4,000 feet elevation there were 5 species of conifers (equally common) and 1 species of oak. ii. A "center" is a circular area of dead and dying trees, from 20-200 min diameter. The trees dying are all one species or related species, a phenomenon known as selective mortality. The deaths are caused by disease, normally a local infection of fungal pathogens. iii. Example: The black stain fungus, Ophiostoma wageneri, kills Ponderosa Pines. It creates a center because it infects the roots.
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