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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Ecological Disturbance02:26

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...
Ecological Succession02:17

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...

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Related Experiment Video

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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Patch dynamics, persistence, and species coexistence in metaecosystems.

Dominique Gravel1, Nicolas Mouquet, Michel Loreau

  • 1Biology Department, McGill University, Montréal, Québec, Canada. dominique_gravel@uqar.qc.ca

The American Naturalist
|July 27, 2010
PubMed
Summary
This summary is machine-generated.

Nutrient flows between plant communities influence species coexistence and persistence. Spatial nutrient dynamics create indirect interactions, impacting metaecosystem diversity and organization.

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Area of Science:

  • Ecology
  • Ecosystem Dynamics
  • Community Ecology

Background:

  • Spatially structured communities are influenced by colonization-extinction dynamics.
  • Understanding the interplay between local community processes and regional nutrient dynamics is crucial.

Purpose of the Study:

  • To develop a plant-based metaecosystem model to investigate the impact of nutrient flows on community persistence and coexistence.
  • To analyze how spatial nutrient dynamics influence local and regional ecological processes.

Main Methods:

  • Derivation of a plant-based metaecosystem model.
  • Explicit coupling of nutrient dynamics with patch dynamics (colonization-extinction).
  • Analysis of nutrient flow direction between occupied and empty patches.

Main Results:

  • The proportion of occupied patches significantly affects local nutrient dynamics.
  • Strong feedback exists between local and regional dynamics, mediated by nutrient flows.
  • Nutrient flows can positively or negatively impact species persistence and coexistence.
  • Net nutrient flow from occupied to empty patches can create indirect facilitative interactions.

Conclusions:

  • Integrating ecosystem and spatial dynamics reveals significant indirect interactions shaping community organization.
  • Nutrient flows are key drivers of metaecosystem diversity and community dynamics, including competition-colonization trade-offs and successional patterns.