The microevolution of the Galápagos marine iguana Amblyrhynchus cristatus assessed by nuclear and mitochondrial genetic analyses

@article{Rassmann1997TheMO,
  title={The microevolution of the Gal{\'a}pagos marine iguana Amblyrhynchus cristatus assessed by nuclear and mitochondrial genetic analyses},
  author={Kornelia Rassmann and Diethard Tautz and Fritz Trillmich and Chris Gliddon},
  journal={Molecular Ecology},
  year={1997},
  volume={6}
}
Marine iguanas may have inhabited the Galápagos archipelago and its former, now sunken islands for more than 10 million years (Myr). It is therefore surprising that morphological and immunological data indicate little evolutionary divergence within the genus. We utilized mitochondrial DNA (mtDNA) sequence analyses and nuclear DNA fingerprinting to re‐evaluate the level and pattern of genetic differentiation among 22 marine iguana populations from throughout the archipelago. Both genetic marker… 
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The hybrid status of a morphologically unusual iguana from this island is confirmed, using restriction fragment length polymorphism (RFLP) analyses of the nuclear ribosomal DNA (rDNA) of the Galapagos iguana, and it was the offspring of a female land iguana and a male marine iguana.
Genetic differentiation between marine iguanas from different breeding sites on the island of Santa Fe (Galapagos Archipelago).
We studied patterns of genetic diversity within and among 5 populations (318 individuals) of Galápagos marine iguanas (Amblyrhynchus cristatus) from the island Santa Fé. Populations were separated by…
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The complete mitochondrial genomes of the marine iguana Amblyrhynchus cristatus and the land iguana Conolophus subcristatus are described and a phylogeny of the Iguanidae is presented, which confirms the sister-group relationship of Galápagos iguanas.
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This study is a nice example of how recently developed analytical tools such as Bayesian clustering analysis and DNA sequence-based demographic analyses can overcome potential biases introduced by simply relying on FST estimates from markers with different inheritance patterns.
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TLDR
It is hypothesized that the observed interplay of speciation and hybridization might be a mechanism by which local adaptations, generated by incipient speciation, can be absorbed into a common gene pool, thereby enhancing the evolutionary potential of the species as a whole.
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For conservation purposes, populations from Floreana, Santa Cruz, San Cristóbal and Santiago should be regarded as separate genetic management units and all five populations should be protected.
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TLDR
This work described the genetic structure of tortoises on the island of Isabela, where discrimination of different taxa is still subject of debate, and used 10 microsatellite loci to assess levels of genetic divergence among and within island populations.
Conservation of Galápagos land iguanas: genetic monitoring and predictions of a long‐term program on the island of Santa Cruz
TLDR
Analysis of the population genetic structure of land iguanas from Santa Cruz Island to investigate the genetic implications of a semi‐captive conservation program and suggest the genetic measures that should be adopted to avoid further genetic variability depletion and preserve this vulnerable endemic species.
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