Demografía de Palaemonetes argentinus nobili (Decapoda natantia) en la laguna Chascomus, Buenos Aires, Argentina. supervivencia, migraciones, biomasa y fecundidad
1995; Volume: 11; Issue: 1 Linguagem: Inglês
10.23818/limn.11.05
ISSN2660-8537
Autores Tópico(s)Fish biology, ecology, and behavior
ResumoNumerical changes of a P. argentiizus population in Chascomús Pond (Buenos Aires province, Argentina) are analyzed here based on the application of exponential survival model.Observed variations in density and biomass during the year, were attributed to interna1 migrations within the pond.The description of numerical variations including mortality and local migrations was explained by the following equation: N(t),,-lO' ~, i j e -~j ( ~% i ) , where i= cohort, j= sex, t= time, No= initial number, z= instantaneous rate of IJmortality, and E = a Fourier polynomial of one order.The biomass to which each sex and cohort contributed was also discriminated.The percentage of embrionated females during annual cycle and spawning season are recorded.The first mean size was estimated at approximately 10,9 mm of the caparison-rostrum corresponding to one year old individuals.In order to express fecundity (F) in relation with the length of caparison-rostrum (CR) the following equation was used: F=0.074 C R ~. ~~~ .The fecundity of each one of the three cohorts was anaiyzed during the three spawning season.INTRODUCCI~N El camarón Palaeinonetes argentinus (Caridea, Palaemonidae) es una especie sudamericana que vive exclusivamente en agua dulce.Se encuentra desde el sur de Brasil (Río Grande do Sul) hasta la región centrolitoral de Argentina (Córdoba, Mendoza, Delta del Paraná, Río de la Plata (RINGUELET, 1949, BOSCHI, 198 1, RODRIGUES CAP~TULO & FREYRE, 1989, SCHULDT & RODRIGUES CAPÍTULO, 1985) y tiene su límite de distribución sur en la Provincia de Buenos Aires, poblando charcas artificiales, arroyos y lagunas pampásicas.Por su abundancia numérica y protagonismo en las cadenas tróficas de ambientes pampásicos varios autores han dedicado estudios tendientes al conocirniento de su biología y desarrollo larval (BOSCHI,
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