Ecology 8310 Population (and Community) Ecology The effects of diversity Background Tilman and Downing 1994 Species vs. functional diversity Foodwebs (instead.

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Presentation transcript:

Ecology 8310 Population (and Community) Ecology The effects of diversity Background Tilman and Downing 1994 Species vs. functional diversity Foodwebs (instead of primary producers only) Form of BES relationship Niche complementarity vs. sampling effects Portfolio effect

How will a system's "function" be affected if you change the diversity of a guild of coexisting species…

"function"?

E.g., Resistance Resilience (may inc. resistance; or rate of return; or a measure of disturbance needed to send it to another "structure") Ecosystem function (fluxes) Ecosystem services (benefits to society: water quality, food production, shoreline protection…)

WRT ecosystem functions, there are two divergent views: Species are redundant Species are complementary

Let's examine some empirical studies…

Approach 1.Severe drought 1987 and Long-term data on experimental plots that varied in plant species richness 3.Compared effect of drought (as function of species richness): 'resistence' 4.Response: Biomass 1988 /Biomass 1986

Results:

Recovery? Response: Biomass 1992 /Biomass 1986

Recovery?

Issues? 1.What generated the gradient in diversity ? Nitrogen manipulation more N  increased plant biomass & decreased species richness i.e., species richness or nitrogen? 2.Species vs. functional diversity 3.Species (sampling effect) vs. niche complementarity? 4."Averaging" (the portfolio effect)

Identity vs. Diversity:

Results ResponseSpecies diversity Funct'nal diversity Plant biomass ++ Plant % N0 - Plant total N0 + Soil ammonia0 - Soil nitrate0 - Light penetration 0 -

8 eukaryote species richness levels (0 – 31) 4 trophic levels Measured: Realized richness Densities Respiration (CO 2 ) Decomposition Invasions success

Ecosystem respiration:

Decomposition

Invasibility:

Niche complementarity vs. Sampling ("selection") effects Both tend to be present

Do polycultures perform better than monocultures of the "best" species (transgressive overyielding)? Yes  niche complementarity No  sampling effect 37% of studies show transgressive overyielding (63% do not)

More diverse communities have lower temporal variance

The portfolio effect

Tilman distinguishes three components: Portfolio effect (baseline: species fluctuate independently; constant mean community biomass) Covariance effect (e.g., asynchrony) Overyielding (biomass increases with S)

Diversity is important (but a variety of mechanisms operate)