Gene flow and population structure in the Mexican blind cavefish complex (Astyanax mexicanus)
- BiologyBMC Evolutionary Biology
The similar cave phenotypes found in these caves are the result of repeated convergences in spite of gene flow from surface populations suggesting either strong natural or sexual selection for alleles responsible for the cave phenotype in the cave environment.
Repeated evolution of eye loss in Mexican cavefish: Evidence of similar developmental mechanisms in independently evolved populations.
- BiologyJournal of experimental zoology. Part B, Molecular and developmental evolution
Comparing eye morphology and the expression of eye regulatory genes in developing surface fish and two independently evolved cavefish populations found that many of the previously described molecular and morphological alterations that occur during eye development in Pachón cavefish are also found in Molino cavefish.
Convergence and Parallelism in Astyanax Cave-Dwelling Fish
Interestingly, complementation analyses show that vision loss and pigmentation loss evolve through similar and different genomic regions, respectively, and this chapter discusses experimental approaches that have shed light on this question—complementation crosses and candidate gene analyses.
Chapter 8. Evolution and development in the cavefish Astyanax.
- BiologyCurrent topics in developmental biology
The rise of Astyanax cavefish
- BiologyDevelopmental dynamics : an official publication of the American Association of Anatomists
The rise of this model system from its discovery by a Mexican surveyor in 1936 to a powerful system for cave biology and contemporary genetic research is documented, which has provided insight to the mechanisms of phenotypic regression, the genetic basis for constructive trait evolution, and the origin of behavioral novelties.
Evolution and Development in the Cavefish Astyanax
Although functional eyes are lacking in adults, cavefish embryos begin to develop eye primordia, which subsequently degenerate, and the major cause of eye degeneration appears to be apoptotic cell death of the lens.
Loss of Schooling Behavior in Cavefish through Sight-Dependent and Sight-Independent Mechanisms
- BiologyCurrent Biology
The complex origin of Astyanax cavefish
- BiologyBMC Evolutionary Biology
It is shown that cave forms originated from at least two distinct ancestral surface-dwelling stocks over the past several million years, and each stock gave rise to multiple invasions of the subterranean biotope.
Genetic basis of eye and pigment loss in the cave crustacean, Asellus aquaticus
- BiologyProceedings of the National Academy of Sciences
This work shows the potential of Asellus for studying the extremes of parallel and convergent evolution—spanning comparisons within populations to comparisons between vertebrate and arthropod systems.
SHOWING 1-10 OF 22 REFERENCES
Convergent evolution of the cavefish Astyanax (Characidae, Teleostei): genetic evidence from reduced eye‐size and pigmentation
This work has confirmed that in different cave populations of the cave-dwelling characid Astyanax, different mutations in the eye gene system have occurred, and that in cases where these non-functional rudimentary genes are recombined in hybrid specimens, gene expression may be restored.
Evidence for multiple genetic forms with similar eyeless phenotypes in the blind cavefish, Astyanax mexicanus.
- BiologyMolecular biology and evolution
An analysis of variation in the mitochondrial NADH dehydrogenase 2 (ND2) gene among different surface fish and cavefish populations identifies a minimum of two genetically distinctive cavefish lineages with similar eyeless phenotypes.
Regressive Evolution in the Mexican Cave Tetra, Astyanax mexicanus
- BiologyCurrent Biology
Regressive evolution: ontogeny and genetics of cavefish eye rudimentation
This result shows that the retina and lens are independent developmental units within the eye ball, Presumably, the genetic systems responsible for both show independent inheritance, which is also corroborated by hybrids of F2-crosses between the cave and surface fish, in which lens and retina development do not correlate.
GENETIC INTERPRETATION OF REGRESSIVE EVOLUTIONARY PROCESSES: STUDIES ON HYBRID EYES OF TWO ASTYANAX CAVE POPULATIONS (CHARACIDAE, PISCES)
- BiologyEvolution; international journal of organic evolution
In a series of central Mexican limeormes, the extremely ubiquitous Astyanax stone caves several populations of cavermexicanus advanced farthest north and tonicolous characins are found, which are day…
Phylogeography of surface and cave Astyanax (Teleostei) from Central and North America based on cytochrome b sequence data.
- BiologyMolecular phylogenetics and evolution
The development of vision in the zebrafish (Danio rerio).
- BiologyDevelopmental biology
The retinal image and functional extraocular muscles appeared nearly simultaneously with the onset of tracking eye movements and probably represent the last events in the construction of this behavior.
Drift diving in female northern elephant seals: implications for food processing
- Environmental Science
Predictions from the hypothesis that northern elephant seals drift during the bottom segment of some dives (called C dives) using oxygen saved from reduced locomotion to process food are tested.
Evolution and Genetics of Epigean and Cave Astyanax fasciatus (Characidae, Pisces)
In the study of cavernicolous animals, the Mexican characid fish Astyanax fasciatus has come to play a role equivalent to that of the fruit fly, Drosophila, in genetics.
Swimming gaits, passive drag and buoyancy of diving sperm whales Physeter macrocephalus
- Environmental ScienceJournal of Experimental Biology
Whales glides more during portions of dives when buoyancy aided their movement, and whales that glided more during ascent glided less during descent (and vice versa), supporting the hypothesis that buoyancy influences behavioural swimming decisions.