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Updated: Apr 14, 2026

RNA In situ Hybridization in Whole Mount Embryos and Cell Histology Adapted for Marine Elasmobranchs
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Assessing differences among elasmobranch nurseries to aid conservation based on a genomics framework.

Dominic G Swift1, Amanda M Barker1, William B Driggers2

  • 1Marine Genomics Laboratory, Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA.

Conservation Biology : the Journal of the Society for Conservation Biology
|April 13, 2026
PubMed
Summary

Scalloped hammerhead sharks exhibit strong nursery site fidelity, with limited genetic exchange between populations. This genetic connectivity, though weak, is crucial for maintaining genetic variation and enhancing resilience in these vulnerable elasmobranch populations.

Keywords:
Fidelidad al sitioconservation geneticsessential habitatsgenética de la conservaciónhábitats esencialessharkssite fidelitytiburones位点忠诚度保护遗传学关键栖息地鲨鱼

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Area of Science:

  • Marine Biology
  • Conservation Genetics
  • Population Genomics

Background:

  • Elasmobranch nurseries vary significantly in environmental conditions, demographics, and usage patterns.
  • These variations impact genetic diversity distribution among nurseries.
  • Current conservation strategies often overlook these nursery-specific differences due to characterization difficulties.

Purpose of the Study:

  • To assess differences in connectivity, genetic variation, and breeder numbers among scalloped hammerhead (Sphyrna lewini) nurseries.
  • To analyze genetic structure and dispersal patterns within and between western North Atlantic nurseries.
  • To apply a genomic framework for conservation assessments of elasmobranch nurseries.

Main Methods:

  • Genotyped 472 young scalloped hammerheads using a reduced-representation genomic approach (8,334 SNP loci).
  • Inferred full- and half-sibling relationships.
  • Utilized mitochondrial genome haplotypes to distinguish maternally and paternally related half-siblings.

Main Results:

  • Identified 45 sibling pairs, with 91% originating from the same nursery, indicating strong site fidelity.
  • Detected weak but significant genetic heterogeneity among nurseries (0.02% variation, FST = 0.00018).
  • Observed differences in standing genetic variation and effective population size, though not statistically significant.

Conclusions:

  • Female scalloped hammerheads demonstrate consistent use of specific nurseries.
  • Connectivity between nurseries, facilitated by straying individuals, aids in the dispersal of genetic variation.
  • This dispersal enhances population resilience to environmental changes, highlighting the importance of understanding nursery connectivity for conservation.