FA2008 - BILD 3 - Lecture 10 (Community Ecology - 04)

FA2008 - BILD 3 - Lecture 10 (Community Ecology - 04) -...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
11/13/08 1 VII. PATTERNS OF SPECIES DIVERSITY Some places have high species diversity, tropical rain forest Other places have low species diversity - this boreal forest is dominated by only two species of trees; black spruce and white spruce Two key factors correlated with a community’s species diversity A. geographic location (i.e. latitude) B. size A. LOCATION Latitudinal Gradients in Species Richness Species richness generally declines along an equatorial-polar (latitudinal) gradient A. LOCATION Latitudinal Gradients in Species Richness Many factors may contribute to this pattern including: – 1. Age – 2. Climate 2 main climatic factors correlated with biodiversity: – solar energy input and water availability (high in tropics) – combined = evapotranspiration (evaporation of water from soil and from plant transpiration) Actual - actual amount of water loss Potential - amount water loss if unlimited water available
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 11/13/08 2 Two key factors correlated with a community’s species diversity A. geographic location (i.e. latitude) B. size Area Effects Species-area curve Breeding birds in North America Summary (1) - Community Ecology I. Communities may be interdependent (Clements) or independent (Gleason) assemblages of species II. Many interspecific interactions (competition, predation, herbivory, parasitism, mutualism, & commensalism) III. Species Diversity richness vs. relative abundance dominant species, keystone species, ecosystem engineers IV. Trophic Structure Summary (2) - Community Ecology V. Top-down and Bottom-up control mesopredator release hypothesis (cats in SD) VI. Disturbance human, ecological succession (early species facilitate, inhibit, or tolerate succession) VII. Patterns of species diversity A. location (latitudinal gradient) age, climate B. size (species area curves)...
View Full Document

This note was uploaded on 03/31/2009 for the course BILD 3 taught by Professor Wills during the Winter '07 term at UCSD.

Page1 / 2

FA2008 - BILD 3 - Lecture 10 (Community Ecology - 04) -...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online