Replacement of the Troglomorphic Population of Rhamdia quelen (Pisces: Pimelodidae) by an Epigean Population of the Same Species in the Cumaca Cave, Trinidad, West Indies

Romero, Aldemaro; Singh, Anuradha; McKie, Annabelle; Manna, Michael; Baker, Ruth; Paulson, Kelly M.; Creswell, Joel E.

doi:10.1643/0045-8511(2002)002[0938:rottpo]2.0.co;2

Cited by 12 publications

(14 citation statements)

References 12 publications

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“…For example, studies of cave environments reveal the occurrence of morphological regression in species such as the cavedwelling form of Astyanax mexicanus and the blind Fish Physiol Biochem (2009) 35:29-42 35 cave catfishes Trogloglanis pattersoni, Satan eurystomus, and Pimelodella kronei (Langecker and Longley 1993;Trajano 1997). Examples of major regression phenomena in these Ostariophysi, in addition to the lack of pigmentation of cave dwelling Rhamdia quelen (Romero et al 2002), suggest that regressive mutations could also have developed in particularly permissive habitats, such as the thermal Valcheta Stream . Notothenioids have unusual characteristics, including some events of disaptations (loss of evolutionary function) and adaptive recoveries (Montgomery and Clements 2000), that are associated to the successful adaptive radiation this group has undergone and to the special thermal conditions they experienced.…”

Section: Thermal Stability Morphological Reduction and Disaptationmentioning

confidence: 99%

Fishes of southern South America: a story driven by temperature

Cussac

Fernández

Gómez

et al. 2008

Fish Physiol Biochem

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The latitudinal extension of southern South America imposes a thermal gradient that affects the structure of marine and freshwater fish assemblages and the biology of the species through direct exposure to the temperature gradients or by means of a web of historical and ecological relationships. We have reviewed biological and ecological data of marine and freshwater fishes from the southern Neotropics, including Patagonia, and report several examples of dependence on temperature, from glacial times to today's climate change. We were able to identify historic and present effects on the diversity of fish assemblages, isolation, southern limits for the distribution of species, and morphological variation among populations. There is a wide range of characteristics that exemplify an adaptation to low temperatures, including biochemical peculiarities, physiological adjustments, and alternative life history patterns, and these appear in both freshwater and marine, and native and exotic fishes. The consequences of stable temperature regimes in both the ocean and thermal streams deserve special mention as these shape specialists under conditions of low selective pressure. At present, habitat use and interactions among species are being subject to changes as consequences of water temperature, and some of these are already evident in the northern and southern hemispheres.

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Section: Thermal Stability Morphological Reduction and Disaptationmentioning

confidence: 99%

Fishes of southern South America: a story driven by temperature

Cussac

Fernández

Gómez

et al. 2008

Fish Physiol Biochem

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“…Notes were also made on several other species that enter the streams. Romero et al (2002) reported on the replacement of blind, troglomorphic forms of Rhamdia cf. quelen in the Cumaca cave by the normal epigean form.…”

mentioning

confidence: 99%

Annotated list and key to the stream fishes of Trinidad & Tobago

Phillip¹,

Taphorn²,

Holm³

et al. 2013

Zootaxa

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“…Beginning in the 1950s, a number of specimens were collected in the cave showing variability in eye size and pigmentation. Results now suggest that the troglomorphic population has been completely replaced by the epigean morph of the same species in as little as 50 years (Romero et al 2002). Another example is with the blind tetra, Astyanax mexicanus, from Pachón cave in Mexico.…”

Section: Discussionmentioning

confidence: 90%

Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization

Espinasa¹,

Robinson²,

Soares³

et al. 2018

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Cave organisms are often characterized by reduced pigmentation, eyesight, and enhanced mechanosensory functions. The stygobitic catfish Astroblepus pholeter is found within some subterranean drainages in Ecuador. The species was first described in 1962 with specimens that were all highly depigmented and troglomorphic. The next observations in the field occurred until 2011, 2015 and 2018. At such dates, specimens examined progressively displayed more surface-like appearance. Appendages in these individuals were progressively shorter and pigmentation levels are now as high as some surface Astroblepus. Based on sampled specimens, it would appear that since 1962, the population has been progressively composed of less troglomorphic individuals. One possibility is that the population has undergone introgressive hybridization in recent years as surface Astroblepus are known to enter the caves and cohabitate with the troglomorphic Astroblepus. Lastly, we report that Individuals are able to detect and respond to light. Histological analyses show that A. pholeter's eyes have all of the major ocular structures (lens, optic nerve, and all retinal layers).

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Replacement of the Troglomorphic Population of Rhamdia quelen (Pisces: Pimelodidae) by an Epigean Population of the Same Species in the Cumaca Cave, Trinidad, West Indies

Cited by 12 publications

References 12 publications

Fishes of southern South America: a story driven by temperature

Fishes of southern South America: a story driven by temperature

Annotated list and key to the stream fishes of Trinidad & Tobago

Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization

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Replacement of the Troglomorphic Population of Rhamdia quelen (Pisces: Pimelodidae) by an Epigean Population of the Same Species in the Cumaca Cave, Trinidad, West Indies

Cited by 12 publications

References 12 publications

Fishes of southern South America: a story driven by temperature

Fishes of southern South America: a story driven by temperature

Annotated list and key to the stream fishes of Trinidad &amp; Tobago

Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization

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Product

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Annotated list and key to the stream fishes of Trinidad & Tobago