Comparative study on free-running locomotor activity circadian rhythms in Brazilian subterranean fishes with different degrees of specialization to the hypogean life (Teleostei: Siluriformes; Characiformes)

Trajano, Eleonora; Carvalho, M R; Duarte, Leandro Lourenção; Menna‐Barreto, Luiz

doi:10.1080/09291010902731205

Cited by 21 publications

(14 citation statements)

References 7 publications

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“…Studies on circadian rhythms, using the methods described in Trajano & MennaBarreto (1995) and Trajano et al (2005) for the locomotor activity in eight specimens monitored in continuous darkness (free-running conditions) for 7 to 10 consecutive days, showed that these fishes are arhythmic, without any significant circadian or ultradian rhythms (Trajano et al, 2009). This is consistent with the hypothesis that a population that has undergone a long period of isolation in a very stable environment, such as the phreatic habitat, devoid of zeitgebers (Ali et al, 1992) like daily cycles of light and temperature, experiences a regression of time-keeping mechanisms, with loss of circadian components of the locomotor activity.…”

Section: Behaviourmentioning

confidence: 99%

Rediscovery and redescription of the unusual subterranean characiform Stygichthys typhlops, with notes on its life history

Moreira

Bichuette

Oyakawa

et al. 2010

Journal of Fish Biology

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The rediscovery of the enigmatic subterranean characiform Stygichthys typhlops is reported almost a half-century after the collection of the holotype, the only specimen previously known. Thirty-four specimens were collected in two shallow hand-dug wells at the region of the type locality, c. 13 km south-west of the town of Jaíba, Minas Gerais, Brazil. These specimens provide new information on the morphology of this species, and for the first time on its life history. The conservation status of S. typhlops is discussed. The species is severely threatened by habitat loss caused by exploitation of the aquifer.

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Section: Behaviourmentioning

confidence: 99%

Rediscovery and redescription of the unusual subterranean characiform Stygichthys typhlops, with notes on its life history

Moreira

Bichuette

Oyakawa

et al. 2010

Journal of Fish Biology

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“…The studies that have been conducted on ultradian rhythms have reported average periods approximately of 4 h with very large amplitude. Recently some authors have reported ultradian rhythmicity in cave-dwelling organisms: Trajano et al (2009) in Brazilian subterranean fishes and Soriano- Morales et al (2013) in cave Diplurids. Regarding their underlying physiological mechanisms, we know very little, and it is unclear if and how ultradian periodicity arises from the apparently stochastic behaviour of individual bouts and how it interacts with the near 24-h period of the circadian system.…”

Section: Introductionmentioning

confidence: 99%

High variability in the expression of circadian rhythms in a cave beetle population

Pasquali¹,

Sbordoni

2014

Biological Rhythm Research

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Cave-dwelling organisms belong to widely different evolutionary lineages but they show parallel or convergent evolution in several morphological and physiological traits such as elongated appendages, lower metabolism, specialized sensory systems, loss of eye and pigmentation. Circadian rhythms in locomotor activity have already been documented in hypogean insects but ultradian rhythmicity in cave-dwelling organisms has been reported only by recent authors. We selected Laemostenus latialis as a good candidate to investigate the biological clock functioning in a species thought to be at its beginning of the process of cave evolution in the darkness. We based our analysis on inferential methods used here to obtain the quantitative resolution of the rhythm features. An automatic electronic device was developed to this purpose so to continuously monitoring the general locomotor activity of individual cave-dwelling beetles. We found significant locomotor rhythms to be present and that Laemostenus maintained a 24-h circadian rhythm but with a different amplitude. We observed two different and opposite behavioural patterns: the "Rhythmic group" showed a typical circadian rhythmicity of surface-dwelling animals with a surprisingly and extremely stable circadian period and with a restricted variance and a high amplitude. Differently, within the "arrhythmic group" we have observed an evanescent circadian period with high variability in tau, a larger variance and a lower amplitude. DFT spectral analysis showed the presence of ultradian rhythms with several significant peaks in the range 1-10 h and a main peak at 12 h, similar to those found in mysid crustaceans, cockroaches and mice. Ultradian rhythm looked independent from the circadian one and we did not observe any regularity. Further experimental studies are still needed to track the variation of this trait along the process of adaptation to cave life, particularly in closely related populations and species of troglophilic animals. © 2014 © 2014 Taylor & Francis

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“…Além disso, diferenças quanto ao grau de troglomorfismo, com vários casos de variabilidade populacional, em mosaico no grau de desenvolvimento de olhos, pigmentação e outras caracteristicas, fornecem excelentes oportunidades para a investigação dos modos de regressão dos mecanismos de controle temporal da atividade locomotora na faixa circadiana (Trajano & Menna-Barreto, 1995Trajano et. al., 2005Trajano et. al., , 2009b.…”

Section: Peixes Subterrâneosunclassified

“…quelen pode atingir até 3 kg em condições artificiais (Gomes et al, 2000). Estudos de ritmicidade circadiana da atividade locomotora em peixes troglóbios sugerem a existência de uma correlação entre o grau de especialização morfológica (troglomorfismo) e a redução dos mecanismos de controle temporal (Trajano & Volpato, 2006;Trajano et al, 2009b;. No caso de Rhamdia sp.…”

Section: Fator De Condiçãounclassified

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Ecologia populacional e comportamento de peixes subterrâneos, Rhamdia sp. n. e Ancistrus sp. n., da área cárstica da Serra da Bodoquena, Mato Grosso do Sul (Siluriformes: Heptapteridae, Loricariidae)

Borghezan¹

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AgradecimentosAgradeço profundamente a todos aqueles que direta ou indiretamente participaram da construção deste trabalho, seja durante os trabalhos de campo ou no laboratório. À todos, meus sinceros agradecimentos. À Profa. Dra. Eleonora Trajano, pela oportunidade, apoio e inestimável orientação fornecida ao longo deste trabalho, sem a qual não seria possível a realização do mesmo.À FAPESP pela concessão da bolsa de estudo e da reserva técnica (Processo nº 2010/03084-2), sem a qual não seria possível realizar este projeto. Ao Programa de Pós Graduação em Zoologia da Universidade de São Paulo, pela concessão do auxílio Proap e Proex para o custeio de parte dos gastos em campo. Ao CNPq (Processo nº 143379/2009-7), pela concessão da taxa de bancada da bolsa de Doutorado de Lívia M.Cordeiro-Borghezan, na qual foi de especial ajuda para o custeio de parte dos gastos de locomoção.À Lívia Medeiros Cordeiro-Borghezan, pelo companheirismo em todos os momentos, pelo incentivo, apoio em campo e laboratório, pelas inúmeras discussões acerca do trabalho, além é claro, do querido carinho.Aos meus pais, por me apoiarem em todas as minhas decisões, por me ensinarem a dar valor às pequenas atitudes, pela concessão do carro, sem o qual não seria possível a realização do presente trabalho. AbstractThis project studied aspects of the population ecology of two troglomorphic Siluriformes of genera Rhamdia and Ancistrus, which are syntopics in a subterranean stream of Serra da Bodoquena karst area, Mato Grosso do Sul. The research comprised the investigation of the population sizes and densities, survival rates, individual growth rate, frequency of standard length, weight and condition factor, and displacements. Adicionally, the behavior of Rhamdia sp. n. was investigated with focus on locomotor rhythmicity and reaction to light. Six collections were made between 2010 and 2011 to gather population data, based on visual census and mark-recapture, as well as search for other localities to investigate the distribution range of these species. The population size estimated to Rhamdia sp. n. was 391 individuals in Fadas Cave and 104 individuals in the Cinco de Ouros Cave. The population densities of Ancistrus sp. n. suggests a lower population size compared to Rhamdia sp. n., possibly with less than 100 individuals in the studied area. The average population density estimated through visual census to Rhamdia sp. n. was 0.09 ind / m² in the Fadas Cave and 0.1 ind. / m² in the Cinco de Ouros Cave, lower than the results estimated by mark-recapture, 0. 76 ind. / m² and 1.48 ind. / m², for each cave, respectively. To Ancistrus sp. n., the average population density was 0.018 ind / m². The low variability throughout the year in population densities, weight, and in condition factor for both species in Fadas Cave, indicate and higher environmental stability in this cave compared to Cinco de Ouros Cave. In Rhamdia sp. n., individuals without externally visible eyes (anophthalmics) showed higher survival rate compared to those with asymmetric or ...

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Comparative study on free-running locomotor activity circadian rhythms in Brazilian subterranean fishes with different degrees of specialization to the hypogean life (Teleostei: Siluriformes; Characiformes)

Cited by 21 publications

References 7 publications

Rediscovery and redescription of the unusual subterranean characiform Stygichthys typhlops, with notes on its life history

Rediscovery and redescription of the unusual subterranean characiform Stygichthys typhlops, with notes on its life history

High variability in the expression of circadian rhythms in a cave beetle population

Ecologia populacional e comportamento de peixes subterrâneos, Rhamdia sp. n. e Ancistrus sp. n., da área cárstica da Serra da Bodoquena, Mato Grosso do Sul (Siluriformes: Heptapteridae, Loricariidae)

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