caa a22 4500 388093307 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199906 xx s 000 0 eng 10.4039/Ent131405-3 doi S0008347X00010014 pii (NATIONALLICENCE)cambridge-10.4039/Ent131405-3 COMPARATIVE ECOLOGY OF TWO SPECIES OF HYDROPORUS (COLEOPTERA: DYTISCIDAE) IN A HIGH ARCTIC OASIS [Elektronische Daten] 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. Copyright © Entomological Society of Canada 1999 deBruyn Adrian M.H. Biology Department, McGill University, 1205 Doctor Penfield Avenue, MontrCal, Quebec, Canada H3A 1B1 Ring Richard A. Biology Department, University of Victoria, Box 1700, Victoria, British Columbia, Canada V8W 2Y2 The Canadian Entomologist Cambridge University Press 131/3(1999-06), 405-420 0008-347X 131:3<405 1999 131 TCE https://doi.org/10.4039/Ent131405-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131405-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- deBruyn Adrian M.H. Biology Department, McGill University, 1205 Doctor Penfield Avenue, MontrCal, Quebec, Canada H3A 1B1 NATIONALLICENCE 700 1- Ring Richard A. Biology Department, University of Victoria, Box 1700, Victoria, British Columbia, Canada V8W 2Y2 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/3(1999-06), 405-420 0008-347X 131:3<405 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge