INVESTIGADORES
COLAUTTI Dario Cesar
artículos
Título:
Variaciones estacionales e históricas de las especies ícticas de la laguna Chascomús
Autor/es:
BERASAIN G. E.; COLAUTTI D. C.; REMES LENICOV M.; VELASCO C. A.
Revista:
Biología Acuática
Editorial:
ILPLA-UNLP
Referencias:
Lugar: La Plata; Año: 2005 vol. 22 p. 47 - 58
ISSN:
0326-1638
Resumen:
In the last five decades the ictiofauna of Chascomús Shallow lake has beenstudied in quite detail. Between 1999 and 2000 monthly samples of fish withfyke nets were taken. Thus obtaining the cuali-quantitative composition ofeach sample taken. These were used to assess the variations between sitesand seasons of the year. Among the 17 species caught Porteño, pejerrey andsabalito were present in all the samples taken, wichwere dominant and wichrepresented 51%, 24% and 14% of the total number respectively, and 28%10% and 37% in weight. Their composition was similar in all stations samplingat every date. Notwithstanding this differences between abundance (CPUEn)and the extracted biomass (CPUEw) were observed. The capture by unit oftotal effort decreased from winter to autumn. The average (CPUEw) forChascomús was above the values corresponding to 47 samples taken in differentwater bodies from Buenos Aires pampas. Comparing the results with theobtained historical data throughout 40 years it was observed that the percentageof the planctophagous species, pejerrey and mandufia marked a decliningtendency. On the other handthe biomass of the porteño and sabalito showed a marked increase. Significant correlations between these changes and theantropogénic impact were observed.