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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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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
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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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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
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A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...

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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

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Published on: July 30, 2019

Limiting similarity and niche theory for structured populations.

András Szilágyi1, Géza Meszéna

  • 1Department of Biological Physics, Eötvös University, Pázmány Péter sétány 1A, H-1117 Budapest, Hungary. szilagyi@angel.elte.hu

Journal of Theoretical Biology
|January 6, 2009
PubMed
Summary
This summary is machine-generated.

We introduce a new theory for structured populations, defining species niches by impact and sensitivity vectors. Sufficient niche segregation is key for robust coexistence in structured and spatial environments.

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Area of Science:

  • Theoretical Ecology
  • Population Dynamics
  • Evolutionary Biology

Background:

  • Ecological niche theory traditionally focuses on unstructured populations.
  • Understanding niche dynamics in structured populations is crucial for predicting species coexistence.
  • Individual states (i-states) within a population can influence its ecological interactions.

Purpose of the Study:

  • To extend niche theory to structured populations with finite individual states.
  • To define species niches using impact and sensitivity niche vectors for structured populations.
  • To investigate the conditions for robust coexistence in structured and multi-patch environments.

Main Methods:

  • Development of a theoretical framework for limiting similarity and niche in structured populations.
  • Specification of population niche using impact and sensitivity vectors derived from individual states.
  • Analysis of coexistence conditions based on the segregation of impact and sensitivity niche vectors.
  • Modeling coexistence in multi-patch environments to interpret spatial niche segregation.

Main Results:

  • The niche of a structured population is defined by its impact and sensitivity niche vectors.
  • Robust coexistence requires significant segregation in both impact and sensitivity niche vectors.
  • Population-level impact is proportional to the frequency of each individual state.
  • Population sensitivity depends on the frequency and reproductive value of initial and final i-states in demographic transitions.

Conclusions:

  • The theory provides a mechanistic link between individual states and population-level niche properties.
  • Sufficient niche segregation, both in impact and sensitivity, is essential for species coexistence in structured populations.
  • The framework offers insights into spatial niche segregation through multi-patch environment analysis.