BIO205H5 Lecture Notes - American Bullfrog, Homeostasis, Batrachochytrium
Document Summary
Conservation is concerned with biodiversity: reduced amount of predatory fishes. Biodiversity changes over time: diversity is a moving target, early vascular and pteridophytes increased very early on and now has leveled off, angiosperms are increasing. And sometimes diversity dropped big time: plants and animals, by 60 million years ago, it dropped dramatically. Mchumor dinosaur comic: extinction of dinosaurs. There are different types of biodiversity: species diversity, genetic diversity, ecological diversity. How many variants of habitats: phylogenetic diversity, behavioural diversity. Same species can behave differently in different environments. Are we currently experiencing the sixth extinction: globally, still about 30% pure species. In some areas like north america, the species diversity is going up because of conservation and protection of animals. In areas such as tropic south america, there"s a decrease of 44: but overall, there"s still a continual decline of diversity globally, total living planet index = -28% There are a range of causes for the decline of biodiversity.
