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Experimental Manipulation of Body Size to Estimate Morphological Scaling Relationships in Drosophila
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How does evolutionary evaluation illuminate body size among canids?

Basil P Tangredi1, Dennis F Lawler2,3

  • 1Vermont Institute of Natural Sciences, Quechee, VT.

American Journal of Veterinary Research
|February 12, 2024
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Summary

Mammalian body size, particularly in canids, is influenced by life history and genetics. Domestication led to diverse dog breeds with complex relationships between size, lifespan, and evolutionary patterns.

Keywords:
caniddogdomesticationsizeskeletal diversity

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Mammalogy

Background:

  • Mammalian body size varies significantly, especially within Carnivora, challenging traditional macroevolutionary rules like Bergmann's and Cope's.
  • Canid lineages exhibit a wide range of body sizes, often originating from mesocarnivoran ancestors and diversifying towards larger forms.
  • Phenotypic plasticity, driven by life history, plays a key role in body size variation.

Approach:

  • Review of existing literature on mammalian body size, focusing on canids and gray wolf domestication.
  • Analysis of macroevolutionary patterns and their correlation with modern genomic and phenotypic studies.
  • Examination of the interplay between gene flow, epigenetic modifications, and environmental factors in shaping body size.

Key Points:

  • High gene flow (hybridization and introgression) in canids has been a significant driver of genomic variation, enabling phenotypic plasticity in body size.
  • Epigenetic marks link genetic expression to environmental conditions, influencing manifested phenotypes.
  • Larger mammalian body size generally correlates with a longer lifespan, reflecting long-term genomic and environmental influences.

Conclusions:

  • Modern domestic dog breeds, despite larger sizes, show a trend toward shorter lifespans, a consequence of domestication-driven genetic changes.
  • These domestication-related phenotypes in dogs emerge against a backdrop of conserved mammalian developmental and physiological patterns.
  • Understanding body size evolution in canids provides insights into broader mammalian evolutionary processes and the impact of domestication.