El pez Trachelyopterus striatulus (Siluriformes: Auchenipteridae) como herramienta de muestreo de la entomofauna en un embalse tropical

dos Santos, Alejandra Filippo Gonzalez Neves; Racca-Filho, Francisco; Neves dos Santos, Luciano; Araújo, Francisco Gerson
December 2009
Revista de Biología Tropical;dec2009, Vol. 57 Issue 4, p1081
Academic Journal
The study of aquatic environments is sometimes difficult to do with normal sampling methods that use gears. Insectivorous fishes represent good users of these ecosystems and analyzing the aquatic organisms present in fish stomachs, is an alternative way to determine resource abundance and utilization. In this paper, the potential of Trachelyopterus striatulus as an insect sampler was examined through dietary analyses of 383 individuals caught between April 1999 and March 2000 in Lajes Reservoir, a 30 km2 oligotrophic impoundment in Southeast Brazil. We estimated frequency of occurrence and Schoener's index of similarity. Diet changes among seasons and reservoir zones were addressed with DCA and ANOVA analyses. Its diet was 92.1% insects (ten orders and nine families). Hymenoptera (57.90%), Odonata (39.76%), Trichoptera (27.41%), Ephemeroptera (26.25%) and Coleoptera (28.96%) were the most common groups. Highest insect occurrence and richness were recorded in autumn-summer, a period of greater rainfall and insect activity. Formicidae, the dominant prey item in all seasons, appeared to be especially important in spring, a season marked by shortness of food resources. Trichoptera and Ephemeroptera were the most consumed prey items in the other seasons. Highest insect occurrence and richness were recorded in the middle and upper reservoir zones, respectively. Trichoptera and Ephemeroptera prevailed in the upper zone, where small pristine rivers and tributaries are abundant, whereas Formicidae and Belostomatidae predominated in the lower and middle zones. Because of its abundance in many freshwater ecosystems of Brazil, the ubiquity of insects in its digestive tract and the low level of prey degradation, T. striatulus has potential as an insect sampler of Neotropical reservoirs. However, conventional sampling in Lajes Reservoir is necessary to compare the effectiveness of T. striatulus with other insect sampling methods. Rev. Biol. Trop. 57 (4): 1081-1091. Epub 2009 December 01.


Related Articles

  • Seasonal Differences in Predator-prey Behavior in Experimental Streams. Pennuto, Christopher M. // American Midland Naturalist;Oct2003, Vol. 150 Issue 2, p254 

    Invertebrate prey have been shown to select suboptimal resource patches in the face of predation (the food-predation risk trade-off). The foraging strategy used by a predator and the environmental context under which an interaction occurs potentially mediates prey responses to predators, Here, I...

  • Developmental responses to predation risk in morphologically defended mayflies. Dahl, Jonas; Peckarsky, Barbara L. // Oecologia;Oct2003, Vol. 137 Issue 2, p188 

    Densities and species composition of predators could affect morphological defences, larval development and the timing of emergence of their prey. To address this issue we studied the morphology and life history of an ephemerellid mayfly, Ephemerella invaria, from two streams in a deciduous...

  • Behavioral mimicry in Myrmarachne species (Araneae, Salticidae) from North Queensland, Australia. Cecearelli, Fadia Sara // Journal of Arachnology;2008, Vol. 36 Issue 2, p344 

    Batesian ant mimics -- such as salticids belonging to the genus Myrmarachne -- resemble their models to deceive potential predators, sometimes including the ants themselves. Myrmarachne species in addition to being striking visual mimics of ants also wave their first pair of legs in the air,...

  • Heroic ants give their lives to protect their colony.  // New Scientist;10/4/2008, Vol. 199 Issue 2676, p16 

    The article reports on the results of a study by Adam Tofilski of the Agricultural University of Cracow, Poland and colleagues on the noble ant or Forelius pursillus in Sao Paulo, Brazil. They studied the colonies of such ants and found that up to eight ants per colony locked themselves out by...

  • Expression of a behaviourally mediated morphology in response to different predators. Boyero, Luz // Ecological Research;Nov2011, Vol. 26 Issue 6, p1065 

    The risk of predation generally entails alterations in prey behaviour or morphology, but only a few organisms, such as caddisfly larvae, are able to undergo rapid morphological changes mediated by behaviour. Here I explore whether predatory fish ( Squalius pyrenaicus) and crayfish ( Procambarus...

  • MUTUAL INTERFERENCE BETWEEN PREDATORS CAN GIVE RISE TO TURING SPATIAL PATTERNS. Alonso, David; Bartumes, Frederic; Catalan, Jordi // Ecology;Jan2002, Vol. 83 Issue 1, p28 

    Studies how mutual interference between predators can give rise to turing spatial patterns. Spatial patterns in the distribution of organisms; Study of predator-prey interactions; Focus on reaction-diffusion predator-prey relations; Origin of predator dependence; Rate of prey consumption.

  • The mayfly-walleye connection. Allard, Tim // Ontario Out of Doors;May2005, Vol. 37 Issue 4, p15 

    The article presents information on walleye. Its teeth have evolved to feed on fish. Yet, walleye do not survive on fish alone. Ever the opportunists, these marble-eyed predators snatch easy meals whenever they get the chance, and there are few underwater appetizers as easy for them to eat as...

  • Too Hot to Handle. Tregaskis, Sharon // Organic Gardening;Feb/Mar2009, Vol. 56 Issue 2, p37 

    The article presents facts about Red Imported Fire Ant (RIFA). It suggests the use of orange oil against RIFA since it has D-limonene which disintegrates the wax coating that lines the respiratory tract of RIFA. In the U.S., these insects cost $1 billion annually in medical treatment, damage...

  • Effects of oil droplets by Pieris caterpillars against generalist and specialist carnivores. Shiojiri, Kaori; Takabayashi, Junji // Ecological Research;Nov2005, Vol. 20 Issue 6, p695 

    Pieris rapae larvae secrete small oil droplets from their dorsal setae, which adhere to objects that touch them. The function of the droplets was studied in terms of both generalist and specialist predators. We tested the function of the droplets against ants under laboratory and field...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics