%0 Journal Article
%T Seasonal dynamics of larvae and adults of two Enochrus Thomson (Cole車ptera: Hydrophilidae) species in temporary and permanent water bodies of an urban park in Buenos Aires Din芍mica estacional de larvas y adultos de dos especies de Enochrus Thomson (Coleoptera: Hydrophilidae) en cuerpos de agua temporarios y permanentes en un parque urbano de Buenos Aires
%A BARBARA BYTTEBIER
%A SYLVIA FISCHER
%A PATRICIA L. M. TORRES
%J Revista chilena de historia natural
%D 2012
%I Springer
%X The dynamics of Enochrus variegatus (Steinheil) and Enochrus vulgaris (Steinheil) in temporary pools and permanent ponds were studied in an urban park of Buenos Aires, Argentina. Samples were collected from both types of habitats weekly throughout one year, and variables like water surface and vegetation cover were recorded. In permanent ponds, adults of both species were found throughout the study period, while in temporary pools their presence depended on the availability of water. Differences in their reproductive seasons and breeding sites were observed. Enochrus vulgaris was characterized by an opportunistic strategy, and its larvae were detected in both types of habitats, associated mainly with spring and summer temperatures. Conversely, E. variegatus larvae were recorded almost exclusively in temporary pools, during the winter and spring seasons. In permanent ponds, both species were associated with vegetation cover, which could be related to the availability of refuges from fish predators. First instar larvae showed the highest abundance and were captured more frequently, in consecutive weeks and simultaneously with third instar larvae, suggesting that the two populations studied are not synchronized in oviposition time or development of immature stages. In several occasions, second instar larvae of both species were captured in a pool that had been dry during the previous sampling date, suggesting that they had not hatched from fresh laid eggs. Our findings show that adults of these species are capable of dispersal to and from temporary pools to avoid drought. In addition, their larval stages may also be able to resist drought in the pools by burrowing into the substrate. Se estudi車 la din芍mica de Enochrus variegatus (Steinheil) y Enochrus vulgaris (Steinheil) en ambientes acu芍ticos temporarios y permanentes de un parque de Buenos Aires, Argentina. Las muestras fueron colectadas semanalmente a lo largo de un a o en ambos tipos de ambiente, y se registraron variables como la superficie anegada y la cobertura vegetal. En los ambientes permanentes se capturaron ejemplares adultos de ambas especies a lo largo de todo el per赤odo de estudio, mientras que en temporarios su presencia vari車 de acuerdo con la disponibilidad de agua. Se observaron diferencias en la 谷poca reproductiva y sitios de cr赤a de ambas especies. Enochrus vulgaris mostr車 una estrategia m芍s oportunista, y sus larvas fueron detectadas en los dos tipos de ambiente asociadas principalmente con temperaturas de la primavera y el verano. En cambio las larvas de E. variegatus fueron registra
%K adaptaci車n a la sequ赤a
%K cole車pteros acu芍ticos
%K din芍mica poblacional
%K Hydrophilidae
%K permanencia de agua
%K adaptation to drought
%K aquatic Coleoptera
%K Hydrophilidae
%K population dynamics
%K water permanence
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000300003