SciELO - Scientific Electronic Library Online

vol.56 issue1Effects of dietary calcium on growth and oviposition of the African land snail Limicolaria flammea (Pulmonata: Achatinidae)Crecimiento del caimán del Orinoco (Crocodylus intermedius, Crocodylia: Crocodylidae) en dos condiciones de cautiverio author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista de Biología Tropical

On-line version ISSN 0034-7744Print version ISSN 0034-7744


FERNANDEZ, Liliana Alicia. The annual life history of a population of the aquatic Coleopteran Derallus angustus (Coleoptera: Hydrophilidae). Rev. biol. trop [online]. 2008, vol.56, n.1, pp.345-348. ISSN 0034-7744.

Derallus Sharp, 1882 is a Neotropical genus of aquatic coleopterans that belongs in the tribe Berosini and includes 15 species. D. angustus Sharp is widely distributed from Guatemala to Argentina. The population dynamics of this species was studied by periodic sampling of a natural population from the southernmost Subtropical Domain of the Neotropical Region. The study site was near Punta Lara (34°47’ S, 58°01’ W; Ensenada, Buenos Aires province, Argentina). Twenty seven samples consisting of 20 units of aquatic vegetation (200 cm² each) were taken during one year. Larvae and adults were removed from the vegetation and counted (pupae were not studied). There was a peak of first instar larvae abundance at the end of spring, and another at the end of summer. Adults and third instar larvae were present throughout the whole year. The population is interpreted as being univoltine and including two periods of enhanced reproductive activity. Rev. Biol. Trop. 56 (1): 345-348. Epub 2008 March 31.

Keywords : aquatic insects; Hydrophilidae; Derallus angustus; population dynamics; Argentina.

        · abstract in Spanish     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License