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COMPARATIVE ECOLOGY OF TWO SPECIES OF HYDROPORUS (COLEOPTERA: DYTISCIDAE) IN A HIGH ARCTIC OASIS

Published online by Cambridge University Press:  31 May 2012

Adrian M.H. deBruyn  and
Richard A. Ring
Adrian M.H. deBruyn*
Affiliation:
Biology Department, McGill University, 1205 Doctor Penfield Avenue, MontrCal, Quebec, Canada H3A 1B1
Richard A. Ring
Affiliation:
Biology Department, University of Victoria, Box 1700, Victoria, British Columbia, Canada V8W 2Y2
*
1Author to whom all correspondence should be addressed.
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Abstract

At Alexandra Fiord, Ellesmere Island, the diving beetles Hydroporus morio Aubé and Hydroporus polaris Fall occur in a series of shallow ponds. Detailed habitat measurements of a temporary and a permanent pond revealed a more complex and extensive organic substrate and vegetation community, longer developmental time, and greater thermal budget in the permanent pond. Hydroporus polaris was most abundant in the temporary pond, but occurred in both; this species oviposited in the absence of macrophytic vegetation, completed larval development quickly, and pupated in the drying pond substrate, and adults dispersed in fall to moister overwintering sites. Hydroporus morio was restricted to the single permanent pond; this species took longer to complete larval development, pupated in wet moss, and overwintered as adults encased in ice on the vertical pond edge. We hypothesize that H. morio is excluded from temporary ponds in the arctic by its requirement for a relatively long development time. Alternatively, H. morio may require sheltered overwintering sites that temporary ponds do not offer.

Résumé

Dans le fjord d’Alexandra, dans l’île d’Ellesmere, les dytiques Hydroporus morio Aubé et H. polaris Fall habitent une série d’étangs peu profonds. Des mesures détaillées de l’habitat dans un étang permanent et dans un étang temporaire ont révélé que le substrat organique et la végétation sont plus complexes et plus développés dans l’étang permanent et que la durée du développement et le budget thermique y sont supérieurs également. Présent dans les deux types d’étangs, Hydroporus polaris est abondant surtout dans l’étang temporaire; l’espèce pond en l’absence de macrophytes, la larve se développe rapidement, la nymphose se fait dans le substrat de l’étang en voie de dessication et les adultes se dispersent à l’automne pour gagner des sites plus humides pour passer l’hiver. Hydroporus morio n’a été trouvé que dans un seul étang permanent; son développement larvaire est plus long, l’espèce fait sa nymphose dans les mousses humides et les adultes passent l’hiver enfouis dans la glace sur la bordure verticale de l’étang. Nous croyons qu’H. morio est exclu des étangs temporaires arctiques à cause de la durée relativement longue de son développement. De plus, H. morio peut nécessiter la présence de sites protégés pour passer l’hiver, ce que n’offrent pas les étangs temporaires.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 3 , June 1999 , pp. 405 - 420
Copyright
Copyright © Entomological Society of Canada 1999

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