BIOL 3130 Lecture Notes - Lecture 3: Hectare, Habitat Destruction
27 Oct 2017
School
Department
Course
Professor
Document Summary
In freshwater, 29% of species lost in the past 35 years. Case study: scientists remain puzzled by mass of dead birds along west coast. Hypothesis: food web collapse, food scarcity, toxicity, natural over- population. Case study: philippines reject dora the explorer underwater theme park. Instead building theme park on 400 hectare land alarming environmentalists. The definitions crisis: most extinctions occur unknowingly (cid:523)(cid:498)death by a thousand cuts(cid:499)(cid:524, most conservation management occurs unknowingly (unprotected protection, most species have not been formally classified, the range and abundances of most classified species are poorly understood. Needed: a precise quantitative measure: species diversity, habitat diversity, genetic diversity, functional. Currently: (cid:498)a bewildering array of diversity indices(cid:499) (cid:523)maturin 1988: (cid:498)a comprehensive approach to biodiversity conservation must spatial and temporal scales(cid:499, [good] density-dependent (cid:494)rarity advantages(cid:495) Richness= number of species per unit area. Abundance= a population-level measure; the relative population sizes of. Rarity enigma: the abundance of non-abundant species means 2 things:
