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Related Concept Videos

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...
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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...
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Microorganisms occupy diverse habitats and perform essential ecological functions that are defined by their ecological niches. A microbial niche encompasses the organism’s mode of survival, including resource acquisition, reproduction, and interactions with other species in its environment. This concept is vital for understanding microbial community dynamics, biogeography, and ecosystem functionality.The fundamental niche of a microorganism includes the full spectrum of environmental...
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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...

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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

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Published on: March 12, 2013

Time as an ecological constraint.

R I M Dunbar1, A H Korstjens, J Lehmann

  • 1Institute of Cognitive & Evolutionary Anthropology, University of Oxford, 64 Banbury Road, Oxford OX2 6PN. robin.dunbar@anthro.ox.ac.uk

Biological Reviews of the Cambridge Philosophical Society
|June 3, 2009
PubMed
Summary

Time, not just climate or resources, limits species survival in habitats. This constraint impacts social species and those with short active days, affecting population density and niche realization.

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Area of Science:

  • Ecology
  • Population Biology
  • Theoretical Ecology

Background:

  • Traditional population biology models focus on climate, nutrients, and predation.
  • These models often overlook the critical role of time as a limiting factor for species survival.

Purpose of the Study:

  • To highlight time as a crucial constraint on population dynamics.
  • To investigate how time allocation affects species' ability to inhabit certain environments.
  • To understand the implications for group size, population density, and niche realization.

Main Methods:

  • Utilized a linear programming approach to model time allocation.
  • Incorporated local environmental and climatic variables influencing time budgets.
  • Defined realizable niche space based on time constraints and minimum viable group size.

Main Results:

  • Time constraints significantly impact species' survival in specific habitats.
  • Social species and those with limited active days are particularly vulnerable to time limitations.
  • The model successfully identifies habitat suitability based on time allocation and demographic stress.

Conclusions:

  • Time allocation is a fundamental determinant of species' distribution and population density.
  • Understanding time constraints is essential for predicting species' responses to environmental and climate change.
  • This framework offers a novel perspective for assessing habitat quality and population viability.