E2.California - California Biodiversity The Unique&...

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Unformatted text preview: California Biodiversity The Unique & Diverse Ecology of California Biodiversity Rank for CA among all US States Richness 1 Endemism 1 Rarity (% at risk) 2 Taxon CA S pp Richness US S pp Richness % of US Spp in CA 5,047 (6,272 var.) 15,890 32% Vascular Plants 51 231 22% Reptiles 84 283 Birds 433 768 Mammals 197 FW Fish 67 Vascular Plants Amphibians 1888 “ Unique Map of California” Produced by the Southern Pacific Railroad and the CA State Board of Trade Taxon #CA Endemics Rank among US States 2,153 1 Amphibians 17 1 30% Reptiles 5 1 56% Birds 2 2 416 47% Mammals 17 1 799 8% FW Fish 20 1 Topography • Long coastline • Series of mountains and valleys in close proximity • Rapid transitions in elevation, slope, soil type, rain harvest/shadow, solar exposure • Isolated populations/communities • Snow pack → year-long water Snow Highest and lowest points in continental US within 80 miles of each other, and 200 miles of the coast. Geology • Igneous rock: volcanic mountains • Metamorphic rock: plate boundaries • Sedimentary rock: old seabed Climate Climate • Major climate types 1. 2. 3. 4. 5. Mediterranean Steppe Cool interior Highland Desert 1 Mapping California’s Biodiversity Vegetation • • • California Floristic Province (CA-FP) – west of Sierra Nevadas & south of Transverse Range • • Much of Mediterranian climate lands converted to urban & agricultural Geographical Information Systems (GIS) Geographical Information Systems • Rarity-weighted Richness Index (RWRI) “Index of i rreplaceability” – For “species of special status” 2003 CA Dept. of Fish & Game project Use published distributions to create resource map to identify localities of significant: – Richness (diversity) – Rarity (special status) – Endemism Geographical Information Systems • Diversity — Species (taxon ) Richness Plant Diversity • Very limited distribution • Low population levels • And/or immediate threat, esp. habitat loss 1. 2. 3. State divided into equal hexagonal grid cells (250.4 mi2 each) How many cells does a species occupy? ↓cells = ↑ rarity rank RWRI for each cell = ∑ (special species x i ts rarity rank) 2 Plant RWRI Mammal Diversity Amphibian Diversity Reptile Diversity Bird Diversity Human Population Density Summer Distribution Winter Distribution 3 ...
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This note was uploaded on 09/02/2011 for the course BIOL 6C taught by Professor Sundram during the Spring '09 term at DeAnza College.

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