We hear a lot about invasive fish, molluscs and crustaceans, but scant attention is paid to anemones. Lucas Gimenez and Antonio Brante analysed 126 papers and found records of 11 introduced anemone species dating back to the late 1890s.

The importance of good taxonomy is illustrated by Łukasz Sługocki et al. in their recent description of the copepod Eurytemora carolleeae in Central Europe.

Using data accumulated over 33 years, Charles Drost et al. found non-native pond sliders caused a long-term decline of native Sonora mud turtles in Arizona, USA.

The marbled crayfish (Procambarus virginalis) was introduced in Europe by release from aquaria. Ana Dobrović and colleagues provide detailed information on the reproduction dynamics of this parthenogenetic species in northern Croatia.

It is not all bad new! Six of the papers in this issue describe mechanisms limiting the effects of invasive species.

Agar Montes et al. examined of the mussel Xenostrobus securis in northwestern Spain and found that species spread may be controlled by seasonal dispersal barriers associated with topographic features.

The freshwater diatom (Lindavia intermedia) was recently introduced in New Zealand and is spreading in lakes. Catherine Kilroy and colleagues analysed the risks of introductions in ~ 3800 lakes, finding a higher risk in lakes on the South Island, but the risks in many lakes were reduced by poor road access.

Tomáš Jůza and colleagues show the recovery of a fish community in a lake in the Netherlands after the natural collapse of an invasive species population.

Pamela Schofield et al. suggest the small geographic range of the non-native croaking gourami (Trichopsis vittata) in Florida may be due to biotic resistance by the native eastern mosquitofish Gambusia holbrooki.

James Whitney and others found that introduced redear sunfish (Lepomis microlophus) populations in Kansas are limited by suitable habitats.

The freshwater cladoceran (Bosmina longirostris) is known to change its morphology in the presence of the predatory invertebrate, Leptodora kindtii. In an interesting study, Stephanie Figary and Kimberly Schulz showed that the species has a similar response to the introduced Cercopagis pengoi.

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