Planktonic community in sequential fishponds
Keywords:
plankton, continuous water flow, fishpondsAbstract
In this study, the effect of the sequentially distributed fishponds in the composition of planktonic community was investigated. Samplings were performed at the water inlet of six fishponds in two periods of the year: rainy and dry seasons. Chlorophyta algae were the most abundant in the phytoplanktonic community, followed by Chrysophyta, Cyanobacteria, Euglenophyta and Cryptophyta/Dinophyta. Concerning the zooplankton, 58 and 48 taxons were registered, during the dry and rainy periods, respectively. Rotifers displayed the greatest number of taxons and was followed by cladocerans and copepods. In the rainy period, zooplankton abundance was greater in fishponds 3 and 4, in which 1,241 and 2,291 ind./L were found, respectively. During the dry period, fishponds 5 and 6 displayed greater number of organisms, with 2,574 and 3,486 ind./L, respectively. The most abundant rotifers in the rainy period were Bdelloida and Conochilus sp., followed by the cladocerans Bosmina hagmanni and Diaphanosoma birgei and by the copepod Thermocyclops decipiens. Moreover, among rotifers and copepods, Polyarthra sp., Trichocerca bidens and Argyrodiaptomus furcatus were distinctive in the dry period. A significant difference (P < 0.05) was observed between the total number of zooplanktonic individuals registered in the rainy period and that occurred in the dry one.
References
BEYRUTH, Z. 2000 Periodic disturbances, trophic gradient and phytoplankton characteristics related to cyanobacterial growth in Guarapiranga Reservoir, São Paulo State, Brazil. Hydrobiologia, 424: 51-65.
BICUDO, C.E.M.; RAMÍREZ, R.J.; TUCCI, A.; BICUDO, D.C. 1999 Diní¢mica de populações fitoplanctônicas em ambiente eutrofizado: O Lago das Garças, São Paulo. In: HENRY, R. (Ed.). Ecologia de reservatórios: estrutura, função e aspectos sociais. Botucatu: FUNDIBIO/FAPESP.p.451-507.
BORICS, G.; GRIGORSZKY, I.; SZABÓ, S.; PADISÁK, J.2000 Phytoplankton associations in a small hypertrophic fishpond in East Hungary during a change from bottom-up to top-down control.Hydrobiologia, 424: 79-90.
BOYD, C.E. e QUEIROZ, J. 1997 Aquaculture pond effluent management. Aquaculture, 4/6: 43-46.
CARPENTER, S.R.; KITCHELL, J.F.; HODGSON, J.R. 1985 Cascating trophic interactions and lake productivity. BioScience, 35(10): 634-639.
DURIGAN, J.G.; SIPAíÅ¡BA-TAVARES, L.H.; OLIVEIRA, D.B.S. 1992 Estudo limnológico em tanques de piscicultura. Parte I: Variação nictemeral de fatores físicos, químicos e biológicos. Acta Limnol. Bras., 4: 211-223.
ELER, M.N. 2000 Impacto de sistemas artificiais rasos (viveiros de piscicultura) e seus efeitos na qualidade da água e na biota aquática. São Carlos. 232p.(Tese de Doutoramento. Universidade de São Paulo).
KOMÁRKOVÁ, J. 1998 Fish stock as a variable modifying trophic pattern of phytoplankton.Hydrobiologia, 369/370: 139-152.
MAGURRAN, A.E. 1988 Ecological Diversity and its measurement. New Jersey: Princeton University Press. 179p.
PADISÁK, J. 1993 The influence of different disturbance frequencies on the species richness,diversity and equitability of phytoplankton in shallow lakes. Hydrobiologia, 249: 135-149.
PINTO-COELHO, R.M.; COELHO, M.M.; ESPÍRITO SANTO, M.M.; CORNELISSEN, T.G. 1999 Efeitos da eutrofização na estrutura da comunidade planctônica na Lagoa da Pampulha, Belo Horizonte, MG. In: HENRY, R. (Ed.).Ecologia de reservatórios: estrutura, função e aspectos socias. Botucatu: FUNDIBIO/FAPESP.p.551-572.
PLOEG, M. e BOYD, C.E. 1991 Geosmin production by cyanobacteria (Blue-green Algae) in fish ponds at Auburn, Alabama. J. World Aquaculture Society, 22(4): 13-16.
REYNOLDS, C.S. 1996 The plant life of the pelagic.Verh. Internat. Verein. Limnol., 26: 97-113.
REYNOLDS, C.S. 1998 What factors influence the species composition of phytoplankton in lakes of different trophic status? Hydrobiologia, 369/370: 11-26.
SAMPAIO, E.V.; ROCHA, O.; MATSUMURATUNDISI, T.; TUNDISI, J.G. 2002 Composition and abundance of zooplankton in the limnetic zone of seven reservoirs of the Paranapanema River, Brazil. Braz. J. Biol., 62(3):
525-545.
SANTEIRO, R.M. e PINTO-COELHO, R.M. 2000 Efeitos de fertilização na biomassa e qualidade nutricional do zooplí¢ncton utilizado para alimentação de alevinos na estação de hidrobiologia e piscicultura de Furnas, MG. Acta Scientiarum, 22(3): 707-716.
SIEGEL, S. 1975 Estatística não paramétrica para as ciências do comportamento. São Paulo: McGrawHill do Brasil. 350p
SIPAíÅ¡BA-TAVARES, L.H. e COLUS, D.S. de O.1997 Estrutura da comunidade fitoplanctônica e zooplanctônica em dois viveiros de cultivo semiintensivo de peixes (Jaboticabal, São Paulo,Brasil). Bol. Lab. Hidrobiol., 10: 51-64.
SIPAíÅ¡BA-TAVARES, L.H. e BRAGA, F.M.S. 1999 Study on feeding habits of Piaractus mesopotamicus (Pacu) Larvae in fish ponds. Naga, the ICLARM Quarterly, 22(1): 24-30.
SOMMER, U. 1993 Disturbance-diversity relationships in two lakes of similar nutrient chemistry but contrasting disturbance regimes. Hydrobiologia, 249: 59-65.
TALAMONI, J.L.B. e OKANO, W.Y. 1997 Limnological characterization and plankton community structure in aquatic systems of different trophic state. Verh. Internat. Verein Limnol., Stuttgart, 26: 629í 636.
