Synopsis
Fish community structure was examined in 9 forested streams (1–6 m wide) in central Panama during dry seasons over a 3 year period. Study regions varied in annual rainfall, degree of canopy shading, and topographical relief. Benthic invertebrates were more abundant in riffles than in pools and more abundant in early (January) than late (March) dry season. In addition, benthos abundances were negatively correlated with canopy shading among study regions. Terrestrial invertebrate abundances were greater in January than March and were correlated with stream width. Fishes were assigned to 7 feeding guilds (algivores, aquatic insectivores, general insectivores, piscivores, scale-eaters, terrestrial herbivores, omnivores) on the basis of similarity of gut contents. Four species exhibited marked dietary shifts with increasing size. Distributions of feeding guilds (biomass) among habitats and streams were not generally correlated with availabilities of their major food resources. All feeding guilds except aquatic insectivores were most concentrated (biomass per area) into deep pools. Densities of algivores and terrestrial herbivores increased with stream size, but the density of aquatic insectivores declined. Species richness of feeding guilds increased with stream size and canopy openness. The proportion of fish biomass supported by algae and terrestrial plant material increased with stream size, while that supported by aquatic and terrestrial invertebrates declined. Small fishes (<40 mm TL) were most abundant in pools of small streams. Terrestrial predators appeared to be more important than food availability in determining distributions of fish among habitats. However, trophic diversity of fish communities may be related to the reliability of available food resources.
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References cited
Angermeier, P.L. 1982. Resource seasonality and fish diets in an Illinois stream. Env. Biol. Fish, 7: 251–264.
Bishop, J.E. 1973. Limnology of a small Malayan river Sungai Gombak. Monogr. Biol. 22. Dr W. Junk Publishers, The Hague. 485 pp.
Connell, J.H. 1975. Some mechanisms producing structure in natural communities: a model and evidence from field experiments. pp. 460–490.In: M.L. Cody & J.M. Diamond (ed.) Ecology and Evolution of Communities, Belknap Press, Cambridge.
Fittkau, E.J. 1964. Remarks on limnology of central-Amazon rain-forest streams. Verh. int. Verein. theor. angew. Limnol. 15: 1092–1096.
Fleming, T.H. 1973. Numbers of mammal species in North and Central American forest communities. Ecology 54: 555–563.
Gorman, O.T. & J.R. Karr. 1978. Habitat structure and stream fish communities. Ecology 59: 507–515.
Gottsberger, G. 1978. Seed dispersal by fish in the inundated regions of Humaitá Amazonia. Biotropica 10: 170–183.
Goulding, M. 1980. The fishes and the forest: explorations in Amazonian natural history. University of California Press, Berkeley. 280 pp.
Greenfield, D.W., F. Abdel-Hameed, G.D. Deckert & R.R. Flinn. 1973. Hybridization betweenChrosomus erythrogaster andNotropis cornutus (Pisces: Cyprinidae). Copeia 1973: 54–60.
Horn, H.S. 1966. Measurement of overlap in comparative ecological studies. Amer. Nat. 100: 419–424.
Horwitz, R.J. 1978. Temporal variability patterns and the distributional patterns of stream fishes. Ecol. Monogr. 48: 307–321.
Hynes, H.B.N. 1970. The ecology of running waters. University of Toronto Press, Toronto. 555 pp.
Inger, R.F. & P.K. Chin. 1962. The freshwater fishes of North Borneo. Fieldiana (Zool.) 45: 1–268.
Janzen, D.H. 1974. Tropical blackwater rivers, animals, and mast fruiting by the Dipterocarpaceae. Biotropica 6: 69–103.
Karr, J.R. 1975. Production, energy pathways and community diversity in forest birds. pp. 161–176.In: F.B. Golley & E. Medina (ed.) Tropical Ecological Systems: Trends in Terrestrial and Aquatic Research, Ecological Studies Vol. II, Springer-Verlag, New York.
Karr, J.R. 1981. Assessment of biotic integrity using fish communities. Fisheries 6: 21–27.
Karr, J.R. & L.A. Dudley. 1981. Ecological perspective on water quality goals. Envir. Manage 5: 55–68.
Karr, J.R., L.A. Toth & G.D. Garman. 1982. Habitat preservation for midwest stream fishes: principles and guidelines. U.S. Environmental Protection Agency 600/3-83-006, Corvallis. 120 pp.
Keast, A. 1977a. Diet overlaps and feeding relationships between the year classes in the yellow perch (Perca flavescens). Env. Biol. Fish. 2: 53–70.
Keast, A. 1977b. Mechanisms expanding niche width and minimizing intraspecific competition in two centrarchid fishes. Evol. Biol. 10: 333–395.
Knöppel, H.A. 1970. Food of central Amazonian fishes: contribution to the nutrient ecology of Amazonian rain forest streams. Amazoniana 2: 257–352.
Kuehne, R.A. 1962. A classification of streams illustrated by fish distribution in an eastern Kentucky creek. Ecology 43: 608–614.
Lotrich, V.A. 1973. Growth, production and community composition of fishes inhabiting a first-, second-, and third-order stream of eastern Kentucky. Ecol. Monogr. 43: 377–397.
Lowe-McConnell, R.H. 1975. Fish communities in tropical freshwater: their distribution, ecology and evolution. Longman, London. 337 pp.
MacArthur, R.H. 1970. Species packing and competitive equilibrium for many species. Theor. Pop. Biol. 1: 1–11.
Morse, D.H. 1980. Behavioral mechanisms in ecology. Harvard University Press, Cambridge. 383 pp.
Parker, R.R. 1963. Effects of formalin on length and weight of fishes. J Fish. Res. Board Can. 20: 1441–1445.
Partridge, L. 1978. Habitat selection. pp. 351–376.In: J.R. Krebs & N.B. Davies (ed.) Behavioral Ecology: An Evolutionary Approach. Blackwell Scientific Publications, Oxford.
Petr, T. 1970. The bottom fauna of the rapids of the Black Volta River in Ghana. Hydrobiologia 36: 399–418.
Pflieger, W.L. 1975. The fishes of Missouri. Missouri Dept. of Conservation, Jefferson City. 343 pp.
Power, M.E. 1983. Grazing ecology of loricariid catfishes in a Panamanian stream. Env. Biol. Fish (In press).
Rabeni, C.F. & G.W. Minshall. 1977. Factors affecting microdistribution of stream benthic insects. Oikos 29: 33–43.
Roberts, T.R. 1973. Ecology of fishes in the Amazon and Congo basin. pp. 239–254.In: B.J. Meggers, E.S. Eyensu & W.D. Duckworth (ed.) Tropical Forest Ecosystems in Africa and South America: A Comparative Review. Smithsonian Inst. Press, Washington.
Rubinoff, R.W. (ed.) 1974. Environmental monitoring and baseline data — 1973. Smithsonian Institution Environmental Sciences Program. Smithsonian Inst., Washington. 45 pp.
Schlosser, I.J. 1982. Fish community structure and function along two habitat gradients in a headwater stream. Ecol. Monogr. 52: 395–414.
Sheldon, A.L. 1968. Species diversity and longitudinal succession in stream fishes. Ecology 49: 193–198.
Slobodchikoff, C.N. & J.E. Parrott. 1977. Seasonal diversity in aquatic insect communities in an all-year stream system. Hydrobiologia 52: 143–151.
Smith, P.W. 1979. The fishes of Illinois. University of Illinois Press, Urbana. 314 pp.
Sokal, R.R. & P.H.A. Sneath. 1963. Principles of numerical taxonomy. W.H. Freeman, San Francisco. 359 pp.
Stout, R.J. 1982. Effects of a harsh environment on the life history patterns of two species of tropical aquatic hemiptera (Family: Naucoridae). Ecology 63: 75–83.
Vannote, R.L., G.W. Minshall, K.W.Cummins, J.R. Sedell & C.E. Cushing. 1980. The river continuum concept. Can. J. Fish. Aquat. Sci. 37: 130–137.
Waters, T.F. 1973. Subsampler for dividing large samples of stream invertebrate drift. Limnol. and Oceanogr. 18: 813–815.
Windsor, D.M. (ed.) 1975. Environmental monitoring and baseline data — 1974. Smithsonian Institution Environmental Sciences Program. Smithsonian Inst., Washington. 409 pp.
Windsor, D.M. (ed.). 1976. Environmental monitoring and baseline data — 1975. Smithsonian Institution Environmental Sciences Program. Smithsonian Inst., Washington. 252 pp.
Windsor, D.M. (ed.). 1977. Environmental monitoring and baseline data from the isthmus or Panama — 1976. Smithsonian Institution Environmental Sciences Program. Smithsonian Ins., Washington. 267 pp.
Zaret, T.M. & A.S. Rand. 1971. Competition in tropical stream fishes: support for the competitive exclusion principle. Ecology 52: 336–342.
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Angermeier, P.L., Karr, J.R. Fish communities along environmental gradients in a system of tropical streams. Environ Biol Fish 9, 117–135 (1983). https://doi.org/10.1007/BF00690857
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DOI: https://doi.org/10.1007/BF00690857