Does pond quality limit frogs Rana arvalis and Rana temporaria in agricultural landscapes? A field experiment
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چکیده
منابع مشابه
Do common frogs ( Rana temporaria ) follow Bergmann ' s rule ?
Questions: Does intraspecific extension of Bergmann s rule – larger size within a species in cooler areas – hold true for ectotherms in general, and for the common frog (Rana temporaria) in particular? What is the relative importance of genetic and environmental factors (i.e. direct environmental induction) in determining latitudinal patterns of body size variation in common frogs? Methods: We ...
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Amphibian populations have been declining globally over the past decades. The intensification of agriculture, habitat loss, fragmentation of populations and toxic substances in the environment are considered as driving factors for this decline. Today, about 50% of the area of Germany is used for agriculture and is inhabited by a diverse variety of 20 amphibian species. Of these, 19 are exhibiti...
متن کاملBreeding phenology in Rana temporaria. Local variation is due to pond temperature and population size
Frog breeding phenology in temperate zones is usually compared to progress of spring temperatures at a regional scale. However, local populations may differ substantially in phenology. To understand this, local climate and other aspects must be studied. In this study, breeding phenology of the common frog, Rana temporaria, in a set of ponds in southern Sweden is analyzed. There was within year ...
متن کاملFast calcium currents in cut skeletal muscle fibres of the frogs Rana temporaria and Xenopus laevis.
Multiple types of voltage-gated Ca channels have been described in a variety of excitable cells (for a review see Tsien et al. 1987). Electrophysiological and biochemical properties of the slow Ca channels in skeletal muscle have been intensively studied during the last decade (for a review see Beaty et ai. 1987; Fosset and Lazdunski 1987). However, recently a fast low threshold Ca 2 + current ...
متن کاملThyroid growth and its relationship to metamorphosis in Rana temporaria.
INTRODUCTION In a previous work on pronephric degeneration, larvae of Rana temporaria from practically the whole range of the metamorphic cycle were studied (Fox, 1962). Metamorphosis in anurans is dependent upon the presence of a functional thyroid gland (Kollros, 1951; Lynn & Wachowski, 1951; Etkin, 1964), and the same specimens have now been used to investigate thyroid growth and development...
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ژورنال
عنوان ژورنال: Journal of Applied Ecology
سال: 2006
ISSN: 0021-8901,1365-2664
DOI: 10.1111/j.1365-2664.2006.01172.x