BIO153H5 Chapter Notes - Chapter 56: Keystone Species, Effective Population Size, Spartina Anglica
Document Summary
Conservation and pop and species level has two main approaches: small-pop approach, declining pop approach, small population appaorch. Sudy the processes that causes extinctions oncepopulation sizes have been severely reduced (as a result of over harvesting, habitat loss, etc) Small pop itself is a threat: pushes towards extinction: the extinction vortex: evol implications of small. Overhunting of seals reduced the pop dramtically >> Spartina anglica hybridization and allopolypoloidy and spread by natural cloning. Therefore, low genetic diversity does not always impede. Plant species seem to have inheretenly low genetic pops of cordgrass are (surive in salt still low genetic diversity in the and asia) Praire chicken of the praire small, fragmented ones in the. Turning native land into agriculture land led to extinction chicken population in canada. Population in illinois had fewer than 50 by 1993. Decline in illinois associated with decline in fertility. Test vortex hypoth by introducing 271 birdsfrom states populations elsewhere.
