Cold-adaptation
Guides
Bombus polaris
Polar Bumble Bee
Bombus polaris is a social Arctic bumble bee adapted to extreme cold environments, occurring above the Arctic Circle in circumpolar regions. It possesses specialized thermoregulatory abilities, dense insulating hair, and constructs heavily insulated nests to survive near-freezing temperatures. The species has an accelerated colony cycle compressed into a short growing season of two to three months. It serves as a critical early-season pollinator in Arctic ecosystems and is the primary host for two social parasite species, Bombus hyperboreus and Bombus natvigi.
Cyphoderris
Hump-winged Grigs
Cyphoderris is a genus of primitive orthopterans known as hump-winged grigs, representing a relict lineage of the ancient family Haglidae (now Prophalangopsidae). These cold-adapted, nocturnal insects are restricted to high-elevation coniferous forests and sagebrush meadows of western North America. Males produce acoustic signals by rubbing their forewings together to attract females. The genus exhibits unusual reproductive biology in which females feed on male metathoracic wing tissue during copulation, and males provide substantial proteinaceous spermatophores. Only three species are currently recognized: C. strepitans, C. buckelli, and C. monstrosa.
Diamesa
Winter Midges, Snow Midges
Diamesa is a genus of non-biting midges in the subfamily Diamesinae of the family Chironomidae. Adults are commonly known as winter midges or snow midges due to their unusual cold-season activity. The genus exhibits remarkable cold tolerance, with adults active at sub-zero temperatures and larvae inhabiting cold, running waters. Some species display wing dimorphism, with brachypterous (short-winged) forms adapted for ground mating on snow and ice, and macropterous (fully-winged) forms that swarm in flight during spring.
Leptothorax acervorum
acorn ant
Leptothorax acervorum is a small myrmicine ant first described by Fabricius in 1793. It exhibits a Holarctic distribution spanning Europe, northern Asia, and North America. The species is notable for its facultatively polygynous social structure, where colonies may contain one or multiple queens. Workers display a distinctive two-toned coloration with darker head and metasoma contrasting with a lighter mesosoma. Body size increases with latitude following Bergmann's rule, with boreal populations producing workers approximately 10% larger than those from central Europe.
Ophraella communa
ragweed leaf beetle
Ophraella communa is a small leaf beetle native to North America that has been introduced to Europe and Asia as a biological control agent for the invasive weed common ragweed (Ambrosia artemisiifolia). Adults and larvae feed on leaves and flowers of Asteraceae, with a strong preference for ragweed. The species has demonstrated rapid adaptive evolution of cold tolerance in newly colonized regions, facilitating northward expansion. Multiple mating is positively associated with fitness in this species, with females preferring larger males that confer reproductive advantages through seminal fluid proteins.