Journal Article

Population ecology of Trichomycterus itacarambiensis, a cave catfish from Eastern Brazil (Siluriformes, Trichomycteridae)

Trajano, E.

Record Number:
Environmental Biology of Fishes
The population ecology of the trichomycterid catfish, Trichomycterus itacarambiensis, from the Olhos d'Àgua Cave, Itacarambi Co., Minas Gerais, eastern Brazil, was investigated by the mark-recapture method during the dry season of 1994 (April to October). The cave is subject to a pronounced seasonality, and is flooded during part of the rainy period. All individuals captured along the 5000 m long stream gallery (divided in 50 sections) were marked by tattooing, measured and examined for the degree of pigmentation reduction. About one third of the population is truly albinic; the remainder may exhibit partial depigmentation. After five bimestrial collections, 583 specimens have been marked, of which 150 were recaptured at least once. Estimated population size was 1500–2000 individuals longer than 20 mm SL. The total population size of T. itacarambiensis is considered small when compared to those of epigean trichomycterids and of other studied cavefishes as well. Mean population density was 0.15–0.20 individuals m-2 throughout the dry season; it increased with the distance to the stream resurgence, probably due to the higher food availability upstream. This population density may be considered intermediate to those of other troglobitic fishes. Most recaptures (66%) were done in the same section as the previous capture. Active movements, both upstream and downstream, were recorded up to distances of 600 m; a few possibly passive, downstream movements covered distances from 900 to 1500 m. T. itacarambiensis catfishes move more frequently and for longer distances than the Brazilian blind pimelodids, Pimelodella kronei. Individual growth in T. itacarambiensis probably occurs in pulses, during the rainy seasons; interruption of growth in the dry season is attributed to the pronounced food shortage. The mean longevity was estimated as seven years. Differences between pigmented and albino individuals include a higher frequency of downstream movements and slightly higher growth rates in the latter.
Times Cited:
Related Records:
Chaimowicz, F. (1984)
Levantamento bioespeleologico de algumas grutas de Minas Gerais
Carvalho, A.M. and de Pinna, M.C.C. (1986)
Estudo do uma populacao hipogea de Trichomycterus (Ostariophysi, Siluroidei, Trichomycteridae) de Gruta Olhos d'Agua, MG
Chaimowicz, F. (1986)
Observacoes preliminares sobre o ecosistema da Gruta Olhos d'Agua, Itacarambi, MG
Trajano, E. and de Pinna, M.C.C. (1996)
A new cave species of Trichomycterus from Eastern Brazil (Siluriformes, Trichomycteridae)
Trajano, E. (1996)
Ecologia, comportamento e evolucao de peixes subterraneas. Estudo de caso: Trichomycterus sp. de caverna Olhos d'Agua, Itacarambi, MG.
Trajano, E. (1996)
Biologia da caverna Olhos d'Agua, Itacarambi, MG
Trajano, E. and Menna-Barreto, L. (1996)
Free-running locomotor activity rhythms in cave dwelling catfishes, Trichomycterus sp., from Brazil (Teleostei, Siluriformes)
Trajano, E. (1997)
Population ecology of Trichomycterus itacarambiensis, a cave catfish from Eastern Brazil (Siluriformes, Trichomycteridae)
Trajano, E. (1997)
Food and reproduction of Trichomycterus itacarambiensis, a cave catfish from south-eastern Brazil
Trajano, E. (1997)
Ecologia populacional de Trichomycterus sp., bagre cavernicola de Minas Gerais (Trichomycteridae)
Trajano, E., Secutti, S. and Bichuette, M.E. (2009)
Populatioin decline in a Brazilian cave catfish, Trichomycterus itacarambiensis Trajano and Pinna, 1996 (Siluriformes): reduced flash flood as a probable cause
Monteiro, A.G.D.P., Guerreiro, M.C., Ferreira, R.L. and Pinto, L.M.A. (2009)
Avaliação do perfil lipídico de peixes cavernícolas
Colihueque, N., Corrales, O, and Yáñez, M. (2017)
Morphological analysis of Trichomycterus areolatus Valenciennes, 1846 from southern Chilean rivers using a truss-based system (Siluriformes, Trichomycteridae)
Monte, B.G.O. and Bichuette, M.E. (2020)
Taxonomic distinctness of the subterranean fauna from Peruaçu Caves National Park, state of Minas Gerais, eastern Brazil
Sampaio, F.A.C., Rufino, M.S., Pompeu, P.S., Santos, H.A. and Ferreira, R.L. (2020)
Hydraulic flow resistance of epigean and hypogean fish of the family Trichomycteridae (Ostariophysi, Siluriformes)
Flórez, J.S., Cadena, C.D., DoNascimiento, C. and Torres, M. (2020)
Repeated colonization of caves leads to phenotypic convergence in catfishes (Siluriformes: Trichomycterus) at a small geographical scale
Flórez, J.S., Cadena, C.D., Donascimiento, C. and Torres, M. (2021)
Repeated colonization of caves leads to phenotypic convergence in catfishes (Siluriformes: Trichomycterus) at a small geographical scale
Campos-Filho, I.S., Gallo, J.S., Gallão, J.E., Torres, D.F., Horta, L., Carpio-Díaz, Y.M., López-Orozco, C.M., Borja-Arrieta, R., Aguiar, J.O. and Bichuette, M.E. (2022)
Unique and fragile diversity emerges from Brazilian caves – two new amphibious species of Xangoniscus Campos-Filho, Araujo and Taiti, 2014 (Oniscidea, Styloniscidae) from Serra do Ramalho karst area, state of Bahia, Brazil
Quintela, F.M., Teixeira, T.F. and Dos Santos Pompeu, P. (2023)
The ichthyofauna of streams and lakes of Lagoa Santa Karst, Minas Gerais state, Brazil
Vilardo, P.J., Katz, A.M. and Costa, W.J.E.M. (2023)
Phylogeny and historical biogeography of neotropical catfishes Trichomycterus (Siluriformes: Trichomycteridae) from eastern Brazil