Bibliographic citations
Argüelles, J., (2004). Cambios en la estructura y dinámica poblacional del caracol Stramonita chocolata (Duclos, 1832) asociados al evento El Niño 1997-98 en la zona del Callao, Perú. [Tesis, Universidad Nacional Mayor de San Marcos]. https://hdl.handle.net/20.500.12672/1577
Argüelles, J., Cambios en la estructura y dinámica poblacional del caracol Stramonita chocolata (Duclos, 1832) asociados al evento El Niño 1997-98 en la zona del Callao, Perú. [Tesis]. PE: Universidad Nacional Mayor de San Marcos; 2004. https://hdl.handle.net/20.500.12672/1577
@misc{sunedu/2867822,
title = "Cambios en la estructura y dinámica poblacional del caracol Stramonita chocolata (Duclos, 1832) asociados al evento El Niño 1997-98 en la zona del Callao, Perú.",
author = "Argüelles Torres, Juan Pedro",
publisher = "Universidad Nacional Mayor de San Marcos",
year = "2004"
}
--- A study of the structure and population dynamics of the snail Stramonita chocolata (Duclos, 1832), related to event El Niño 1997 - 98, was carried out from April 1997 to June 1999 in three rocky subtidal areas in Callao, Peru. During the period of study, significant changes in the structure and population dynamics of the snail were observed. During 1997, the snail presented a higher weight for size, a wider size structure and bigger values of density and biomass; also the spawning period presented a seasonality with two peaks in the months of June - July and November - December. During 1998, it was observed a more prolonged spawning but with lower percentage values. This had a direct effect in the recruitment, with same tendencies but 3 to 4 months delayed. In the population dynamics, significant changes were observed in the rates of growth, from means values of 2,75 mm month-1 for the interval 32,5 - 72,5 mm during 1997 to 1,20 mm month-1 for the interval 16,5 - 60,5 mm during 1998. The natural mortality showed an increment of 0,66 - 0,84% at beginnings of 1998 to 1,98 - 2,37% at beginnings of 1999. It is postulated that the changes in the rates of growth and mortality would be caused by changes in the sea surface temperature and in the diet.
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