Cave Adaptation in Amblyopsid Fishes

1963 ◽  
Vol 70 (2) ◽  
pp. 257 ◽  
Author(s):  
Thomas L. Poulson
Keyword(s):  
Cave Adaptation

scholarly journals The Sinocyclocheilus cavefish genome provides insights into cave adaptation

BMC Biology ◽  
2016 ◽  
Vol 14 (1) ◽  
Author(s):  
Junxing Yang ◽  
Xiaoli Chen ◽  
Jie Bai ◽  
Dongming Fang ◽  
Ying Qiu ◽  
...  
Keyword(s):  
Cave Adaptation

scholarly journals Two new dipluran species unearthed from subterranean habitats of the Canary Islands (Arthropoda, Hexapoda, Entognatha)

2020 ◽  
Vol 34 ◽  
pp. 39-59 ◽  
Author(s):  
Alberto Sendra ◽  
Heriberto López ◽  
Jesús Selfa ◽  
Pedro Oromí
Keyword(s):  
Canary Islands ◽  
Unknown Function ◽  
Monotypic Genus ◽  
Posterior Border ◽  
Lava Tube ◽  
Republic Of Guinea ◽  
Cave Adaptation ◽  
The Family ◽  
Mesovoid Shallow Substratum ◽  
The Republic

Two new dipluran species of the family Campodeidae have been unearthed in the Canary Islands. Remycampa herbanicasp. nov. was found in a highly threatened lava tube on Fuerteventura island. It is related to the soil-dwelling northwest African Remycampa launeyi that also inhabits four of the Canary Islands. The two known Remycampa species are characterized by a torsion of the labial palps. They differ chiefly in the distribution of macrosetae and in the features of cave adaptation of R. herbanica, i.e. elongation of body and appendages, and a higher number of olfactory chemoreceptors with a coniform shape unique within campodeids. Spaniocampa relictasp. nov. was collected in the mesovoid shallow substratum (MSS) and has been assigned to a formerly monotypic genus that includes the soil-dwelling Spaniocampa prima from the Republic of Guinea. The two species differ in the number of abdominal macrosetae. Females of S. relictasp. nov. have small setae arranged in groups along the posterior border of the first urosternite. These structures of unknown function have never been described in other campodeid species. Sequencing the COI barcode region of R. herbanica has been produced but it proved insufficient to identify closest relatives. The two new hexapods from subterranean habitats raise the Canarian campodeid fauna to six species. Five of them are living in soil and/or MSS, whereas the cave-adapted R. herbanica is known only from a single, particularly endangered lava tube distant from other caves.

scholarly journals Plateau Grass and Greenhouse Flower? Distinct Genetic Basis of Closely Related Toad Tadpoles Respectively Adapted to High Altitude and Karst Caves

Genes ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 123
Author(s):  
Liming Chang ◽  
Wei Zhu ◽  
Shengchao Shi ◽  
Meihua Zhang ◽  
Jianping Jiang ◽  
...  
Keyword(s):  
Genetic Basis ◽  
Gene Loss ◽  
Genetic Selection ◽  
High Elevation ◽  
Genetic Adaptation ◽  
The Tibetan Plateau ◽  
Closely Related Species ◽  
Karst Caves ◽  
Binding Domains ◽  
Cave Adaptation

Genetic adaptation to extremes is a fascinating topic. Nevertheless, few studies have explored the genetic adaptation of closely related species respectively inhabiting distinct extremes. With deep transcriptome sequencing, we attempt to detect the genetic architectures of tadpoles of five closely related toad species adapted to the Tibetan Plateau, middle-altitude mountains and karst caves. Molecular evolution analyses indicated that not only the number of fast evolving genes (FEGs), but also the functioning coverage of FEGs, increased with elevation. Enrichment analyses correspondingly revealed that the highland species had most of the FEGs involved in high-elevation adaptation, for example, amino acid substitutions of XRCC6 in its binding domains might improve the capacity of DNA repair of the toad. Yet, few FEGs and positively selected genes (PSGs) involved in high-elevation adaptation were identified in the cave species, and none of which potentially contributed to cave adaptation. Accordingly, it is speculated that in the closely related toad tadpoles, genetic selection pressures increased with elevation, and cave adaptation was most likely derived from other factors (e.g., gene loss, pseudogenization or deletion), which could not be detected by our analyses. The findings supply a foundation for understanding the genetic adaptations of amphibians inhabiting extremes.

scholarly journals Phenotypic plasticity as a mechanism of cave colonization and adaptation

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Helena Bilandžija ◽  
Breanna Hollifield ◽  
Mireille Steck ◽  
Guanliang Meng ◽  
Mandy Ng ◽  
...  
Keyword(s):  
Gene Expression ◽  
Phenotypic Plasticity ◽  
Rapid Evolution ◽  
Next Generation ◽  
Single Generation ◽  
Astyanax Mexicanus ◽  
Cave Adaptation ◽  
Dark Conditions ◽  
Plastic Responses

A widely accepted model for the evolution of cave animals posits colonization by surface ancestors followed by the acquisition of adaptations over many generations. However, the speed of cave adaptation in some species suggests mechanisms operating over shorter timescales. To address these mechanisms, we used Astyanax mexicanus, a teleost with ancestral surface morphs (surface fish, SF) and derived cave morphs (cavefish, CF). We exposed SF to completely dark conditions and identified numerous altered traits at both the gene expression and phenotypic levels. Remarkably, most of these alterations mimicked CF phenotypes. Our results indicate that many cave-related traits can appear within a single generation by phenotypic plasticity. In the next generation, plasticity can be further refined. The initial plastic responses are random in adaptive outcome but may determine the subsequent course of evolution. Our study suggests that phenotypic plasticity contributes to the rapid evolution of cave-related traits in A. mexicanus.

scholarly journals Phylogenetic evidence from freshwater crayfishes that cave adaptation is not an evolutionary dead-end

Evolution ◽  
2017 ◽  
Vol 71 (10) ◽  
pp. 2522-2532 ◽  
Author(s):  
David B. Stern ◽  
Jesse Breinholt ◽  
Carlos Pedraza-Lara ◽  
Marilú López-Mejía ◽  
Christopher L. Owen ◽  
...  
Keyword(s):  
Cave Adaptation ◽  
Dead End

scholarly journals Phenotypic plasticity as a mechanism of cave colonization and adaptation

2019 ◽  
Author(s):  
Helena Bilandžija ◽  
Breanna Hollifield ◽  
Mireille Steck ◽  
Guanliang Meng ◽  
Mandy Ng ◽  
...  
Keyword(s):  
Gene Expression ◽  
Phenotypic Plasticity ◽  
Rapid Evolution ◽  
Next Generation ◽  
Single Generation ◽  
Astyanax Mexicanus ◽  
Cave Adaptation ◽  
Dark Conditions ◽  
Plastic Responses

ABSTRACTA widely accepted model for the evolution of cave animals posits colonization by surface ancestors followed by the acquisition of adaptations over many generations. However, the speed of cave adaptation in some species suggests mechanisms operating over shorter timescales. To address these mechanisms, we used Astyanax mexicanus, a teleost with ancestral surface morphs (surface fish, SF) and derived cave morphs (cavefish, CF). We exposed SF to completely dark conditions and identified numerous altered traits at both the gene expression and phenotypic levels. Remarkably, most of these alterations mimicked CF phenotypes. Our results indicate that cave-related traits can appear within a single generation by phenotypic plasticity. In the next generation, plasticity can be further refined. The initial plastic responses are random in adaptive outcome but may determine the subsequent course of evolution. Our study suggests that phenotypic plasticity contributes to the rapid evolution of cave-related traits in A. mexicanus.

scholarly journals Evolution of coprophagy and nutrient absorption in a cave salamander

2017 ◽  
Author(s):  
Daphne Soares ◽  
Rachel Roenfeldt ◽  
Shea Hammond ◽  
Michael E. Slay ◽  
Dante B. Fenolio ◽  
...  
Keyword(s):  
Trophic Level ◽  
Diet Breadth ◽  
Nutrient Absorption ◽  
Trophic Levels ◽  
Novel Environment ◽  
Food Scarcity ◽  
Cave Adaptation ◽  
Bat Guano

AbstractThe transition from carnivory to omnivory is poorly understood. The ability to feed at more than one trophic level theoretically increases an animal’s fitness in a novel environment. Because of the absence of light and photosynthesis, most subterranean ecosystems are characterized by very few trophic levels, such that food scarcity is a challenge in many subterranean habitats. One strategy against starvation is to expand diet breadth. Grotto salamanders (Eurycea spelaea) are known to ingest bat guano deliberately, challenging the general understanding that salamanders are strictly carnivorous. Here we tested the hypothesis that grotto salamanders have broadened their diet related to cave adaptation and found that, although coprophagous behavior is present, salamanders are unable to acquire sufficient nutrition from bat guano alone. Our results suggest that the coprophagic behavior has emerged prior to physiological or gut biome adaptations.

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