Surface swimming behavior of the curculionid Ochetina uniformis Pascoe (Erirhininae, Stenopelmini) and Ludovix fasciatus (Gyllenhal) (Curculioninae, Erodiscini)

Revista Brasileira de Entomologia

Wesley Oliveira De Sousa²  Marinêz Isaac Marques¹  Germano Henrique Rosado-neto²  Joachim Adis¹ 

[1] ,Universidade Federal do Paraná Departamento de Zoologia Programa de Pós-graduação em Ciências Biológicas (Entomologia)Curitiba PR ,Brasil

关键词: Aquatic/semi-aquatic weevils;    behavioral adaptation;    Central Amazonia;    Pantanal Mato-grossense;    Adaptação comportamental;    Amazônia Central;    gorgulhos aquáticos/semi-aquáticos;    Pantanal Mato-grossense;   

DOI  :  10.1590/S0085-56262007000100015

来源: SciELO

【 摘 要 】

The swimming behavior exhibited by specimens of L. fasciatus and O. uniformis was analyzed frame-by-frame with video observation recorded with a digital camera, attached to a stereomicroscope. Adults of O. uniformis, an aquatic insect, swim with all three pairs of legs. During the process of swimming the majority of the abdomen and rostrum remain submerged, part of the fore and hind tibiae remain above the surface, while the mid tibiae remain submerged. The mesothoracic legs, during the power-stroke stage, provide the greatest thrust while the metathoracic legs provide the least forward propulsion. The prothoracic legs, extended forward, help to direct the swimming. The semi-aquatic specie L. fasciatus shows the same swimming style as O. uniformis, that is, with movement of all the three pairs of legs; the mesothoracic legs are responsible for the main propulsion. The insect body remains on the water surface during the process of swimming, while the legs remain submerged. Both species complete a swimming cycle in 0.33 and 0.32 seconds, respectively, with an average speed of 1.38 cm/s and a maximum and minimum swimming duration time of 11.15 and 5.05 minutes, respectively, for L. fasciatus. The swimming behavior exhibited by O. uniformis and L. fasciatus corresponds to the style known as a breast strokelike maneuver. This is the first record of this kind of swimming for both species here observed and increases to seven the number of genera of Curculionidae exhibiting this behavior.

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