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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
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Beyond body size: consistent decrease of traits within orthopteran assemblages with elevation.

Yvonne Tiede1, Claudia Hemp2, Antje Schmidt3

  • 1Faculty of Biology, Conservation Ecology, Philipps-Universität Marburg, Karl-von-Frisch-Straße 8, Marburg, 35043, Germany.

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|June 27, 2018
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Summary

Morphological traits in orthopterans, including body size and eye size, decrease with increasing elevation and productivity. These changes impact species

Keywords:
Bayesian statisticsBergmann's ruleKilimanjarobody sizeelevation gradientmixed-effects modelmorphological traitsnormalized difference vegetation indexphylogenetic partitioningproductivityresource availability hypothesis

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Zoology

Background:

  • Morphological traits are key to species' environmental interactions.
  • Body size is a critical trait, but rules for interspecific clines in ectotherms are debated.
  • Understanding trait variation across environmental gradients is crucial for evolutionary ecology.

Purpose of the Study:

  • To investigate the relationships between elevation (temperature) and productivity with four key morphological traits in orthopteran assemblages.
  • To determine how body size, wing length, hind femur length, and eye size vary across an altitudinal gradient.
  • To assess the influence of phylogenetic relationships and species-specific adaptations on these morphological patterns.

Main Methods:

  • Sampling of 160 orthopteran species along an extensive environmental gradient on Mt. Kilimanjaro (790–4,410 m a.s.l.).
  • Measurement of body size, wing length, hind femur length, and eye size.
  • Calculation of residuals for non-body size traits to account for body size variation.
  • Bayesian analyses to test relationships between environmental factors and morphological traits.

Main Results:

  • Mean body size, relative wing length, hind femur length, and eye size decreased with increasing elevation.
  • Body size and relative eye size also decreased with increasing productivity.
  • Both phylogenetic inertia and species-specific adaptations explained observed patterns.

Conclusions:

  • Orthopteran assemblages exhibit reduced body size, wing length, hind femur length, and eye size at higher elevations (lower temperatures).
  • Lower productivity also correlates with reduced body size and eye size.
  • These morphological shifts suggest adaptations influencing fecundity, dispersal, escape, and predator detection across environmental gradients.