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handle: 10261/165954
[ES] La Costa Brava catalana, formada por un macizo granítico que llega hasta el mar, presenta condiciones apropiadas para el establecimiento de pequeños charcos de fondos rocoso, en los cuales el agua marina que llega hasta ellos en los días de mar gruesa o con las salpicaduras de las oslas, es diluída por la lluvia o concentrada por la evaporacion, según als circusntancias meteorológicas reinantes. Estos charcos constituyen la residencia ecológica normal de las larvas y pupas de Aédes (Ochlerotatus) Mariae Sergent, un mosquito bastante difundido por todo el litoral circunmediterráneo. En una nota anterior (Margalef, 1946) daba cuenta de la presencia de esta especie en Blanes, donde la hallé en los charcos poblados por Platynionas Fontiana. Pandazis (1940) presenta algunos datos sobre la ecología del mismo mosquito, que, probablemente, son los únicos que se encuentran en la literatura. Respecto a la ecología de las charcas sobre litoral rocoso, véanse las contribuciones de Issel (1914) y especialmente la de Hase (1926). Características de los biotopos.— Se estudiaron una serie de charcos del litoral de Blanes, entre la Falconera y la Aguila. Todos ellos se encuentran sobre substrato granítico, a una altura sobre el nivel del mar que varía entre o y 120 centímetros y a una distancia horizontal de dos a seis metros de las aguas marinas. Su capacidad varía entre 5 y 100 litros y la profundidad mayor, generalmente, no excede de 20 cm. [...]
[EN] Some pools in tlie granitic shore of the littoral of Blanes have been stu- died during the summer of 1949. The little masses of water, varying between 5 and 100 1., are subjected to a daily termic oscillation commonly of 4-13°, tem- perature is always not sensibly inferior to those of the superficial waters of the Mediterranean (23-25° in summer) ; chlorinity of pools inhabited by larvae ranges from 3,03 to 90,35; pH is comprised between S and 8,4; the 02 contení is subjected to a greater daily variation in the pools lesser subjected to the marine influence. Four types of pools may be distinguished, within a series of diminishing marine influence, increasing eutrophy, augmented production of phytoplankton (dinoflagellatae and volvocales) and accumulation of a bottom organic sediment. During the summer season, larvae and pupae of Aédes Mariae are found in the last three types of pools. Otlier species present are summarized in the text. [...]
19 pages, 3 figures, 2 tables
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