Info Lasius brunneus

Info Lasius brunneus

Messaggioda Filobass » 18/06/2011, 13:05

Le avevo scambiate per Lasius emarginatus ieri mentre facevo il portiere di una porta con 2 alberi per pali (un classico).
Ne ho improvettate 4 e a casa, confrontandole con la lista delle specie italiane corrispondevano perfettamente a Lasius brunneus!
Dato che sono una frana con le ricerche su internet, qualcuno mi aiuterebbe a trovare qualche informazione a proposito di questa piccola e simpatica formichina :smile: ?
Purtroppo non le ho viste sciamare, comunque ora che so dove sono le tengo d'occhio :geek:
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Re: Info Lasius brunneus

Messaggioda dada » 18/06/2011, 14:01

La principale differenza fra Lasius brunneus e le sue sorellastre Lasius niger e Lasius emarginatus è proprio il suo essere prevalentemente arboricola; quindi il tuo ritrovamento fra due alberi è congruente con questa specie.

PHYLOGENY. In Europe the niger complex was undergoing speciation along the lines already foreshadowed by the variability of the ancestral species, and the derivative species were in the process of radiating into several major habitats : brunneus was mostly arboreal, alienus and emarginatus showed southern affinities and favored open, dry situations, and niger was more cold-adapted and could penetrate forests in addition to open situations.

DISTRIBUTION. Brunneus is widely distributed in western
Europe, reaching south to North Africa and eastward to the
western Himalayas.

ECOLOGY. Most European authors agree that brunneus is a timid species adapted to living under the bark and in the wood of tree trunks. Donisthorpe (1927) found a large population of this species in the Windsor Forest of England limited to living
trees, which the ants penetrated from the trunk up into the main
branches and down into the roots. Various trees were inhabited,
including oaks, elm, ash, beech, poplar and maple. It is not
clear whether the workers carried on much excavation in the
living wood, but this seems unlikely due to the rather unspec-
tacular mandibular apparatus of the species. Forsslund (1949)
found brunneus in oaks in dense, undisturbed woodland in sev-
eral localities in the vicinity of Stockholm. The nests were mostly
in dead wood, but occasional galleries penetrated living wood.
Scherdlin (1909) found the species in Alsace nesting in the
trunks of trees and timber of houses. Clausen (1938) observed
a swarm of reproductives inside a house in Zurich. Gosswald
(1932) states that in Germany brunneus is found as often under
stones as in dead wood ; since this observation is divergent from
those of other authors, the possibility must be considered that
he was erroneously including some alienus in his concept of
brunneus.
Donisthorpe (ibid.), who has undertaken the most careful
study of this species to date, found workers transporting and
tending aphids of the genus Stomaphis. He also observed them
carrying psocids and other small insects to the nests, presumably
for use as animal food.

SWARMING. Brunneus appears to hold its nuptial flights earlier in the day and season than other European members of the subgenus. Donisthorpe (ibid.) encountered winged queens and males swarming over the trunk of an oak at noon on June 25, and
Forsslund (ibid.) saw the same thing from noon to 1:30 p.m.
during the period June 10-16.


fonte: A monographic revision of the ant genus Lasius (E. O. Wilson, 1955)

:arrow: http://biostor.org/reference/21215
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Re: Info Lasius brunneus

Messaggioda Filobass » 18/06/2011, 18:43

Grandioso, allora magari riesco a beccare una regina in questi giorni :yellow:
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