Wood-ant
Guides
Formica integroides
Western Mound Ant, Vinegar Ant
Formica integroides, commonly known as the Western Mound Ant or Vinegar Ant, is a North American wood ant species in the family Formicidae. This species exhibits flexible, context-dependent foraging strategies at both colony and individual levels, adjusting its behavior based on resource characteristics and competitive pressure. It is known to utilize both terrestrial and arboreal resources, with foragers capable of defending entire trees as absolute territories. The species was first described by Wheeler in 1913.
Pacifastacus leniusculus
Signal Crayfish
The signal crayfish is a large North American freshwater crayfish introduced to Europe in the 1960s to replace declining native fisheries. It has become one of the most ecologically impactful invasive decapods in Europe, outcompeting native crayfish and serving as a carrier of crayfish plague (Aphanomyces astaci). The species establishes self-sustaining populations rapidly, with six age cohorts documented within a few years of introduction. It shows sex- and size-specific coloration patterns, with males displaying more saturated and brighter ventral claw surfaces than females, suggesting a role in intraspecific communication.
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