Cavariella aegopodii (Scopoli, 1763),

Khruleva, Olga A. & Stekolshchikov, Andrey V., 2019, Additions to the aphid fauna of Wrangel Island due to climate change with redescription of the oviparous female of Pterocomma groenlandicum Hille Ris Lambers, 1952 (Hemiptera, Aphidoidea), Zootaxa 4615 (3), pp. 511-528: 520

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Cavariella aegopodii (Scopoli, 1763)


Cavariella aegopodii (Scopoli, 1763) 

Cavariella aegopodii  is here reported on Wrangel Island for the first time, and indeed reported for the first time from anywhere in the Arctic. The species is heteroecious holocyclic, with an amphigonic generation on various Salix  spp. or, in warmer climates, it can be anholocyclic on Apiaceae  . However, Dunn (1965) showed that alatae of this species sometimes recolonize willow, so populations can persist on that host in July and August. Probably due to the short warm summer period on Wrangel Island, this species shifts to a monoecious life cycle on Salix  , reducing the life cycle to three generations. Finding C. aegopodii  in the center of the island and in habitats with their food plants (thickets of shrubs in the floodplain, more characteristic of the landscapes in the southern tundra, Fig. 14), suggests that this species existed here before climate changes.

Material. The middle reaches of the Mamontovaya River: damp plot in the river valley covered with willowgrass-moss community and sparse willow bushes Salix glauca  and Salix lanata ssp. richardsonii  (71° 09.523 N, 179° 45.328 W), 23.vii.2015, sweeping, 1 al.; thick willow bushes ( Salix lanata ssp. richardsonii  , height about 1 m) in the floodplain of the river with a pillow of moss in the lower tier (71° 09.778 N, 179° 45.443 W), 5.viii.2015, sweeping, 1 male.