Variation of the biomass and productivity of Potamogeton pectinatus L. (Potamogetonaceae) in the Lagoa Verde, Rio Grande, RS.
Keywords:
Potamogeton pectinatus, aquatic macrophyte, biomass, productivity.Abstract
This study aimed to evaluate the variation of the biomass of Potamogeton pectinatus L. (Potamogetonaceae), in the Lagoa Verde, in response to abiotic factors. Daily measurements of depth, temperature, salinity, and pH of the water were taken from April 2001 to May 2004. The seasonal variations in the biomass were measured through monthly collections, in the same period. The biomass values of P. pectinatus were significantly different along the three years of study (p < 0.05), with higher values in 2001, and a gradual reduction in the annual values of liquid primary production. The reduced radiation intensity and the high temperatures of 2001 and 2002, or the salinity raise and the reduction of pH in 2003, probably induced the disappearance of the population. The allocation of the biomass at the subterranean tissues at the end of each growth season, represent a strategy of these populations to survive during the winter, characterizing the existence of an annual cycle of life controlled by abiotic factors.
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BERG, M.S. van den; COOPS, H.; SIMONS, J.; KEIZER, A. de. 1998. Competition between Chara aspera and Potamogeton pectinatus as a function of temperature and light. Aquatic Botany, v. 60, p. 241-250.
BIJL, L. van der; SAND-JENSEN, K.; HJERMIND, A.L. 1989. Photosynthesis and canopy structure of a submerged plant, Potamogeton pectinatus, in a danish lowland stream. Journal of Ecology, v. 77, p. 947-962.
BINI, L.M.; THOMAZ, S.M. 2005. Prediction of Egeria najas and Egeria densa occurrence in a large subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay). Aquatic Botany, v. 83, n. 3, p. 227-238.
BUIA, M.C.; ZUPO, V.; MAZZELLA, L. 1992. Primary production and growth dynamics in Posodonia oceanica. P.S.Z.N.I. Marine Ecology, v. 13, p. 2-16.
CARVALHO, R.V.; SILVA, K.G. 1998. Caracterização ambiental do sistema arroio-lagoa do Bolaxa, uma futura área de preservação ambiental. In: Semana Nacional de Oceanografia, 11., 1988, Rio Grande. Anais ... Rio Grande: FURG. p. 46-48.
CAVENAGHI, A.L.; VELINI, E.D.; GALO, M.L.B.T.; CARVALHO, F.T.; NEGRISOLI, E.; TRINDADE, M.L.B.; SIMIONATO, J.L.A. 2003. Caracterização da qualidade de água e sedimento relacionados com a ocorrência de plantas aquáticas em cinco reservatórios da bacia do rio Tietê. Planta Daninha, v. 21, p. 43-52.
COLARES, I.G. 1998. Influência da luz sobre o crescimento e fotossíntese de Ruppia maritima L., no estuário da Lagoa dos Patos. 117 f. Tese (Doutorado em Ciências – Oceanografia Biológica) – Fundação Universidade do Rio Grande, Rio Grande.
COSTA, C.S.B.; SEELIGER, U.; KINAS, P.G. 1988. The effect of win velocity and diretion on the salinity regime in the lower Patos Lagoon estuary. Brasil. Ciência e Cultura, v. 40, n. 9, p. 909-912.
DOMINGOS, V.D.; MARTINS, D.; FERNANDES, D.M.; COSTA, N.V.; PASCHOA, P.L. 2005a. Alocação de biomassa e nutrientes em Heteranthera reniformis sob o efeito de N, P, e K. Planta Daninha, v. 23, n.1, p. 33-42.
DOMINGOS, V.D.; PASCHOA, P.L.; MARTINS, D.; COSTA, N.V. 2005b. Alocação de biomassa e nutrientes em Myriophyllum aquaticum sob diferentes níveis de macronutrientes. Planta Daninha, v. 23, n.2, p. 193-201.
DIJCK, G.M. van; BREUKELAAR, A.W.; GIJLSTRA, R. 1992. Impact of light climate history on seasonal dynamics of a field population of Potamogeton pectinatus L. during a three year period (1986-1988). Aquatic Botany, v. 43, p. 17-41.
DUARTE, C.M. 1991. Seagrass depth limits. Aquatic Botany, v. 40, p. 363-377.
ESTEVES, F.A.; CAMARGO, A.F.M. 1986. Sobre o papel das macrófitas aquáticas na estocagem e ciclagem de nutrientes. Acta Limnologica Brasilica, v. I, p. 273-298.
GARCIA, C.A.E. 1998. Características hidrográficas. In: SEELIGER, U. et al. (Ed.). Os ecossistemas costeiro e marinho do extremo sul do Brasil. Rio Grande. p.18-21.
GARCIA, C.M.; PEREZ-LLORENS, J.L.; NIELL, F.X.; LUCENA, J. 1991. Pigment estimations and photosynthesis of Ruppia drepanensis Tin. ex Guss. in a hypersaline enviroment. Hydrobiologia, v. 220, p. 147-153.
HILLMAN, K.; WALKER, D.I.; LARKUM, A.W.D.; McCOMB, A.J. 1989. Productivity and nutrient limitation. In: LARKUM, A.W.D. et al. (Ed.). Biology of Seagrass. A treatise on the biology of seagrass with special reference to the Australian region. Amsterdam. p. 635-685.
HUTCHINSON, G.E. 1975. A treatise on Limnology; Limnological Botany. New York: John Wiley & Sons. v. 3.
INVERS, O.; ROMERO, J.; PÉREZ, M. 1997. Effects of pH on seagrass photosynthesis: a laboratory and field assessment. Aquatic Botany, v. 59, p. 185-194.
JIAN, Y.; LI, B.; WANG, J.; CHEN, J. 2003. Control of turion germination in Potamogeton crispus. Aquatic Botany, v. 75, p. 59-69.
LAZAR, A.C.; DAWES, C.J. 1991. A seasonal study of the seagrass Ruppia maritima L. in Tampa Bay, Florida. Organic constituents and tolerances to salinity and temperature. Botanica Marina, v. 34, p. 265-269.
LONG, S.P.; MASON, C.F. 1983. Saltmarsh Ecology. New York: Blackie & Sons.
MENÉNDEZ, M.; PEÑUELAS, J. 1993. Seasonal photosynthetic and respiration responses of Ruppia cirrhosa (Petagna) Grande to changes in light and temperature. Archives fúr Hydrobiology, v. 129, n. 2, p. 221-230.
MENENDEZ, M.; SANCHEZ, A. 1998. Seasonal variations in P–I responses of Chara hispida L. and Potamogeton pectinatus L. from stream Mediterranean ponds. Aquatic Botany, v. 61, p. 1-15.
MITCHELL, D.S. 1974. Aquatic vegetation and its use and control. Paris: Unesco. 135p.
OLESEN, B.; SAND-JENSEN, K. 1993. Seasonal acclimatization of eelgrass Zostera marina growth to light. Marine Ecology Progress Series, v. 94, p. 91-99.
PALMA-SILVA, C.; ALBERTONI, E.F.; ESTEVES, F.A. 2002. Clear water associated with biomass and nutrient variation during the growth of a Charophyte stand after a drawdown, in a tropical coastal lagoon. Hydrobiologia, v. 482, p. 79-87.
PEZZATO, M.M.; CAMARGO, A.F.M. 2004. Photosynthetic rate of the aquatic macrophyte Egeria densa Planch. (Hydrocharitaceae) in two rivers from the Itanhém River Basin in São Paulo State, Brazil. Brazilian Archives of Biology and Technology, v. 47, n. 1, p. 153-162.
PILON, J.; SANTAMARÍA, L. 2002. Clonal variation in morphological and physiological responses to irradiance and photoperiod for the aquatic angiosperm Potamogeton pectinatus. Journal of Ecology, v. 90, p. 859-870.
SAND-JENSEN, K. 1989. Environmental variables and their effect on photosynthesis of aquatic plant communities. Aquatic Botany, v. 34, p. 5-25.
SANTAMARIA, L.; GARCIA, A.I.L. 2004. Latitudinal variation in tuber production in an aquatic pseudo-annual plant, Potamogeton pectinatus. Aquatic Botany, v. 79, p.51-64.
SCHLEE, M.D.B. 2002. Variação da biomassa e produtividade de Potamogeton pectinatus L. (Potamogetonaceae) em relação à luz e temperatura. Monografia (Bacharelado em Ciências Biológicas) – Fundação Universidade Federal do Rio Grande, Rio Grande.
VIEIRA, E.F.; RANGEL, S.R.S. 1988. Planície costeira do Rio Grande do Sul. Geografia física, vegetação e dinâmica sociodemográfica. Porto Alegre: Sagra. 256 p.
WIJK, R. J. van. 1988. Ecological studies on Potamogeton pectinatus L. P. I. General characteristics, biomass and life cycles under field conditions. Aquatic Botany, v. 31, p. 211- 258.
WOLFER, S.R.; STRAILE, D. 2004. Spatio-temporal dynamics and plasticity of clonal architecture in Potamogeton perfoliatus. Aquatic Botany, v. 78, p. 307-318.
ZAR, J.H. 1984. Biostatistical analysis. 2. ed. New Jersey: Prentice-Hall. 718 p.
