Northern Colletes
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| Northern Colletes | ||||||||||||||||
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| Colletes floralis Eversmann, 1852 |
The Northern Colletes (Colletes floralis) is a species of bee within the genus Colletes. Northern Colletes are solitary bees, though females may nest in what are termed aggregations – sites where the bees nest close together, but do not form colonies as social bees do.[1] They nest underground in soft (often sandy) soil, digging burrows up to 20 times the length of their bodies.[2] It is often to be found nesting in coastal sand dunes and, on Hebridean islands, machair (coastal grassland).[3]
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[edit] Appearance
The bees are medium sized (with a head-to-body length of around 8–15 mm) and slender. They have a black abdomen, with narrow white bands on each segment. Tawny hairs cover the top of the thorax, with somewhat paler hairs on the face. They are very similar to other species within the Colletes genus and, if more than one of these species shares the same habitat, microscopic exmination can be necessary to distinguish between them. Females are slightly larger than the males, possessing slightly longer abdomens, which are also darker and glossier.[4][5]
[edit] Life cycle
Adult Northern Colletes emerge in late June, and are active until late August. The bees are active only when the temperature is warm. The males emerge one or two days before the females. The females probably mate soon after emergence. The males then die, while the female constructs a burrow which may be as much as 26 cm deep. The female produces a secretion from glands in the mouth, forming a cellophane-like coating[6] for the burrow. Each egg is sealed inside an individual cell, with enough regurgitated nectar and pollen to feed the larva throughout the winter. The larva lives underground, pupating in its burrow and emerging the following June as an adult. As Northern Colletes do not form colonies, there are no worker bees.[4][5][7]
[edit] Distribution
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This is a rare bee. It can be found in the British Isles, where it nests on the Atlantic coasts of Ireland and northern England, while in Scotland it can be found on islands as well as coastal areas of the mainland. Elsewhere in Northern Europe, it is present in low densities in Scandinavia, again in coastal areas.[4][7] It appears to prefer south-facing slopes with low, sparse vegetation; the bee forages in nearby flower-rich areas.[8] In Southern Europe, however, it inhabits higher altitudes, being found in the Pyrenees, Carpathians and Altay Mountains.[4][7]
One of the most significant habitats for this species of bee is the machair (coastal duneland) of the Outer Hebrides in Scotland where it was reported in September, 2007 that eleven previously unknown colonies had been discovered.[1][2]
[edit] See also
[edit] External Links
[edit] References
- ^ a b Ross, David. "Rare species of burrowing bee has flourished in Outer Hebrides", The Herald, 2007-09-13.
- ^ a b Smith, Lewis. "Rare bee finds haven on islands", Times Online, 2007-09-13.
- ^ The northern Colletes (Colletes floralis). Naturally Scottish. Scottish Natural Heritage. Retrieved on 2007-09-14.
- ^ a b c d Northern colletes (Colletes floralis). ARKive. Retrieved on 2007-09-14.
- ^ a b Colletes floralis – Northern Colletes. HabitasOnline. National Museums Northern Ireland. Retrieved on 2007-09-14.
- ^ About the Northern Colletes bee. Royal Society for the Protection of Birds. Retrieved on 2007-09-14.
- ^ a b c Royal Society for the Protection of Birds (2007-09-13). "Remote Scottish islands a stronghold for one of the UK's rarest insects". Press release.
- ^ Details for Colletes floralis Eversmann. National Biodiversity Network's Species Dictionary. Natural History Museum. Retrieved on 2007-09-14.
