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Life Sciences › Agricultural and Biological Sciences › Aquatic Science
Global determinants of freshwater and marine fish genetic diversity
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Paper Summary
Conflicts of Interest
Identified Weaknesses
Rating Explanation
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Paper Summary
Paperzilla title
Fish Genes Like it Hot: Genetic Diversity Makes a Splash in Warmer Waters!
Fish genetic diversity is not uniform across the globe, showing clear biogeographic patterns. Marine fish genetic diversity is positively correlated with sea surface temperature, while freshwater fish genetic diversity is strongly influenced by regional factors and average river slope, with South America as a hotspot.
Possible Conflicts of Interest
None identified
Identified Weaknesses
Uneven Geographic Sampling
The study acknowledges geographic sampling gaps, particularly in the African realm, which could affect the accuracy of associations between genetic diversity and environmental factors.
Limited Genetic Marker
The study focuses on a small barcode region of the mitochondrial genome, primarily representing neutral genetic variation, while genetic diversity is ideally studied across the entire genome, including both neutral and adaptive regions.
Low Explanatory Power of Models
The explanatory power of the statistical models is relatively low, suggesting that unmeasured factors or past demographic history not fully integrated into the models might contribute to variations in genetic diversity.
Potential Mismatch in Temperature Data
Using sea surface temperature as a predictor for all marine species, while some inhabit deep waters, might not accurately reflect their thermal environment, although sea surface and bottom temperatures are often correlated at the continental shelf scale.
Rating Explanation
This study uses a large dataset of genetic information to investigate global patterns of fish diversity, which is an understudied area. Despite some limitations (e.g., limited genetic marker, sampling gaps, low explanatory power), it provides valuable insights into the role of environmental factors, and biogeographic history, as drivers of fish genetic diversity, particularly highlighting the influence of temperature in marine systems. The large-scale approach and the integration of genetic, species, and environmental data make this a valuable contribution.
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Topic Hierarchy
File Information
Original Title:
Global determinants of freshwater and marine fish genetic diversity
File Name:
s41467-020-14409-7.pdf
[download]
File Size:
4.17 MB
Uploaded:
July 14, 2025 at 10:43 AM
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