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28 results on '"Sobrero, Raúl"'

20. Efectos de la actividad turística en los patrones de comportamiento de Stenella Attenuata Gray, 1846 (Delfín manchado) del Pacifico Central de Costa Rica

Author

Sobrero, Raúl

Subjects
Costa Rica, Delfin manchado, Contaminación, Pacífico Central, Biología, Marea roja
Abstract

informe de proyecto de voluntariado -- Universidad de Costa Rica. Programa de Voluntariado, Universidad Nacional del Litoral - Argentina, 2002 El turismo en torno a delfines ha aumentado a escala global, durante las últimas dos décadas en forma significativa y fundamentalmente afectando a especies costeras. Esta actividad con frecuencia, no es llevada a cabo adecuadamente, ya que los operadores turísticos con el fin de concretar el avistamiento, ejecutan cualquier maniobra sobre las poblaciones silvestres. La falta de control y los disturbios crónicos, en diversas poblaciones mundiales, han concluido en la desaparición de la especie del sitio por la migración masiva, trayendo como consecuencia definitiva el cese de la actividad turística y obviamente un impacto importante sobre los animales y el medio marino. Los objetivos de planteados fueron determinar el patrón de comportamiento de Stenella Attenuata Gray, 1846 (delfín manchado) del Pacífico Central de Costa Rica ante la presencia de embarcaciones turísticas y sugerir normas de conductas junto con recomendaciones de acercamiento a los delfines en el área estudiada. Universidad de Costa Rica UCR::Vicerrectoría de Vida Estudiantil

Published
2002

23. Ecological drivers of group living in two populations of the communally rearing rodent, Octodon degus

Author

Ebensperger, Luis A., primary, Sobrero, Raúl, additional, Quirici, Verónica, additional, Castro, Rodrigo A., additional, Tolhuysen, Liliana Ortiz, additional, Vargas, Francisco, additional, Burger, Joseph Robert, additional, Quispe, René, additional, Villavicencio, Camila P., additional, Vásquez, Rodrigo A., additional, and Hayes, Loren D., additional

Published
2011
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28. Seasonality in Reproduction and Reproductive Physiology of Caviomorphs.

Author

Guenther, Anja, Tachinardi, Patricia, Valentinuzzi, Veronica Sandra, Sobrero, Raúl, Eberhardt, Ayelen T., and Trillmich, Fritz

Subjects
*ENVIRONMENTAL sciences, *RAINFALL, *CLIMATE change, *LACTATION, *SEASONS
Abstract

ABSTRACT Animals experience seasonal fluctuations of photoperiod, food availability, temperature and precipitation. This affects their energy budget, often leading to seasonal reproduction. We review available literature and (re)‐analyse existing datasets on seasonal reproduction of South American caviomorph rodents that are characterised by long pregnancies, typically precocial young and short lactation. While births occur nearly year‐round in many species, reproductive investment and reproductive output (litter size, offspring mass and growth) vary seasonally, with largest litters often occurring in spring/summer. Male, as well as female, reproductive physiology varies across seasons in most of the investigated species. Experimental studies manipulating environmental aspects that usually change seasonally (photoperiod, nutrition, density) indicate a slightly different mechanistic basis driving seasonal reproduction in caviomorphs than in rodents of the Northern Hemisphere. Caviomorphs are a key component of various ecosystems and knowledge of their reproduction and how it might be influenced by climate change (i.e., mean and variance of temperature and rainfall) is urgently needed to predict future population trends. [ABSTRACT FROM AUTHOR]

Published
2024
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