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Ancyloxypha arene
Tropical Least Skipper
Ancyloxypha arene, commonly known as the Tropical Least Skipper, is a small grass skipper butterfly in the family Hesperiidae. It is one of the smallest skippers in North America. The species occurs from the southern United States through Central America. Adults are active throughout much of the year in tropical regions, with more restricted flight periods in temperate areas.
grass-skipper least-skipper tropical orange-butterfly small-skipper open-habitat
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.
invasive-species crayfish-plague-carrier decapod freshwater-crustacean conservation-concern species-of-Union-concern early-detection-rapid-response ark-sites ecosystem-engineer bioaccumulation sexual-dimorphism nocturnal-activity invasion-gradient trapping electrofishing eradication Mediterranean-invasion headwater-threat native-crayfish-displacement fisheries-introduction 1960s-introduction Europe Japan California-native Pacifastacus Astacidae Decapoda Malacostraca Arthropoda Aphanomyces-astaci white-clawed-crayfish signal-crayfish control-planning removal-actions catch-per-unit-effort color-variation carotenoids camouflage conspicuousness intraspecific-communication elemental-accumulation contaminant trophic-level macroinvertebrate plant-detritus riffle stream river lake tributary invasion-front core-population exploratory-behavior migration-patterns ontogenetic-color-change kick-sampling detection-protocol false-negative Catalonia Italy Portugal Spain Poland Scandinavia 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Environmental-Audit-Committee £6-million animal-health plant-health resourcing long-term-future slipped-timelines inefficient-process fully-resourced-implementation-plans general-election manifesto smallest-creatures foundations healthy-environment ecosystem-function nature's-decline action commitment England-Manager deliberate-movement release wild conservation-purpose feathered furred multitude large-scale 1980s 1990s 2018 England small-size small-scale region 2005 2007 2008 2010-2015 2009 2010 2019 2022 2023 isolated high-reproductive-potential cost-effective zoo aquarium collaboration ten-different-zoos thousands spiderlings four-new-populations Norfolk Suffolk media-response 2024 headline homeowner urgent-warning relatively-easy-to-rear local-schools colleges volunteers small-aquaria 500-snails four-new-sites 6,000 47-volunteers long-complex-life-cycle long-lived many-years 50,000 specialised-facilities hundreds juvenile-mussels ageing-populations Northern-England natural-range 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