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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Tropical bee species abundance differs within a narrow elevational gradient.

Kristin M Conrad1, Valerie E Peters2, Sandra M Rehan3

  • 1Department of Biological Sciences, Eastern Kentucky University, Richmond, KY, USA. kristin.conrad1230@gmail.com.

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Summary
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Tropical bee abundance and diversity vary with elevation, impacting pollination services. Conservation requires understanding specific elevational ranges for each bee species, not just their full altitudinal distribution.

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Area of Science:

  • Ecology
  • Entomology
  • Conservation Biology

Background:

  • Insect pollination is a critical ecosystem service, with bees being key global pollinators.
  • Tropical bees are vital for biodiversity, yet their elevational distribution patterns are poorly understood.
  • Understanding bee distribution is crucial for effective conservation and agricultural productivity.

Purpose of the Study:

  • To investigate how bee abundance, community composition, and crop visitor assemblages differ across a narrow elevational gradient in Costa Rica.
  • To identify specific elevational ranges crucial for tropical bee species and their pollination services.

Main Methods:

  • Bee surveys conducted at 100 m elevation intervals from 800 to 1100 m.
  • Analysis of bee abundance, species composition, and visitor assemblages for avocado and squash crops.
  • Statistical analysis to determine the influence of elevation on bee communities.

Main Results:

  • Significant differences in abundance were observed for 18 out of 24 bee species across the elevational gradient.
  • Bee assemblages visiting avocado and squash crops showed distinct community compositions between high and low elevations.
  • Elevation was a significant predictor of bee community composition, with stingless bees (Tribe Meliponini) being key visitors.

Conclusions:

  • Tropical montane bee communities and pollination services are sensitive to elevation, even within narrow gradients.
  • Effective conservation strategies must consider the specific elevational niches of bee species.
  • Future conservation efforts should focus on identifying and protecting key elevations supporting high bee diversity and abundance.