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Related Concept Videos

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...
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...
Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
Marine Microbial Ecology01:30

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Published on: March 12, 2013

Extinction order and altered community structure rapidly disrupt ecosystem functioning.

Trond H Larsen1, Neal M Williams, Claire Kremen

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA Department of Biology, Bryn Mawr College, 101 N. Merion Ave., Bryn Mawr, PA 19010, USA.

Ecology Letters
|March 1, 2011
PubMed
Summary
This summary is machine-generated.

Anthropogenic disturbances disrupt ecosystem integrity by altering species extinction order and abundance. Loss of large-bodied species, crucial for ecosystem function, leads to rapid functional decline, impacting overall ecosystem health.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Environmental Science

Background:

  • Anthropogenic disturbances can disrupt ecosystem integrity by altering community structure and processes.
  • The relationship between community structure and ecosystem functioning under natural conditions is not well understood.
  • Habitat loss is a major driver of biodiversity loss and ecosystem change.

Discussion:

  • Habitat loss affects ecosystem functioning through non-random species loss, particularly impacting large-bodied species.
  • The order of species extinction, driven by factors like body size, significantly influences the rate of ecosystem function loss.
  • Reduced species richness and abundance, coupled with altered community structure, contribute to ecosystem functional decline.

Key Insights:

  • Large-bodied bee and dung beetle species are both highly extinction-prone and functionally efficient, leading to disproportionate functional loss.
  • Extinction order, rather than random species loss, causes greater disruption to ecosystem functioning.
  • Declines in total species abundance and richness directly impair ecosystem functions like pollination and decomposition.

Outlook:

  • Understanding non-random species loss is critical for predicting and mitigating the functional consequences of anthropogenic disturbances.
  • Conservation strategies should consider species' functional roles and their susceptibility to extinction to preserve ecosystem services.
  • Further research is needed to explore the long-term impacts of altered community structure on ecosystem resilience and stability.