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Resumen El período de actividad de los insectos es un parámetro que ha demostrado ser de gran utilidad a la hora de realizar aproximaciones a distintos fenómenos cronológicos relacionados con la descomposición cadavérica. Exponemos el caso de un cadáver hallado a finales de enero de 2011 en la orilla de un embalse en la provincia de Granada. Por la zona en la que se recuperaron los restos, la presencia de saponificación en la parte dorsal del tórax y la maceración de manos y pies, se sospechó inmediatamente de una sumersión de los restos y posterior emersión de los mismos. Tras recoger las evidencias entomológicas, se pudo determinar que consistían en larvas en diferentes fases de desarrollo de Calliphora vomitoria (Linnaeus, 1758), siendo las más antiguas recogidas en el cadáver las larvas en fase de des-arrollo III migratoria. A partir del tratamiento estadístico de la información meteorológica recogida en dos estaciones agroclimáticas cercanas y del conocimiento del desarrollo y de la distribución de esta especie necrófaga, se pudo es-timar que el tiempo mínimo que transcurrió desde que el cuerpo emergió del agua hasta que se encontró fue de 22 días. El díptero de la especie antes mencionada es compatible con la zona biogeográfica donde fue hallado el cadáver. Palabras clave: ADD. Calliphora vomitoria. Entomología Forense. Intervalo postmortem. Cadáver sumergido. Abstract Period of insect activity is a parameter that has been shown to be of great usefulness at the moment of making approximations to different chronological phenomena related to cadaveric decomposition. We expose the case of human remains found at the ending of January 2011 in the shore of a reservoir in the province of Granada. Because of the zone in which the remains were recovered, saponification in the dorsal area of the thorax, feet and hands maceration, submersion and a later emersion of the remains were immediately suspected. After collecting the entomological evi-dences, it was possible to determine that they were consisting of different developmental stages larvae of Calliphora vomitoria (Linnaeus, 1758), being the most aged ones recovered from the corpse corresponding to the larva III pos-tfeeding developmental stage. From the statistical treatment of the meteorological data registered in two nearby agro-climatic stations and the knowledge of development and distribution of this necrophagous specie, it was possible to estimate that the minimum time elapsed from the moment when body emerged from the water until it was recovered was of 22 days. Diptera of the species previously mentioned is compatible with the biogeographic zone where the corpse was found.

Algal community structure on natural substrates of thermally altered artificial streams was studied for one year. The streams were fed by a natural blackwater stream near Aiken, South Carolina. Temperature-related shifts in the abundance of major species were demonstrated. Red algae were absent from a stream heated 12.5°C above ambient, but remained abundant in streams heated 7.5 0 C or less. Water temperatures above 30°C produced blue-green algal dominance and eliminated several indigenous species. Substrate specificity was exhibited by all major taxa. Several taxa were abundant only on the bottom sediments and some showed a distinct affinity for either sand or silt, the principal bottom types.

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