First New Zealand records of three non‐indigenous Zooplankton species: Skistodiaptomus pallidus, Sinodiaptomus valkanovi, and Daphnia dentifera

Abstract

We present the first records from New Zealand of three non‐indigenous freshwater Zooplankton species: the Japanese Sinodiaptomus valkanovi, North American Skistodiaptomus pallidus (Copepoda), and Daphnia dentifera (Anomopoda). Owing to their geographic origins, introduction to New Zealand by natural passive dispersal is highly unlikely. Skistodiaptomus pallidus was found in Auckland ponds at two localities, and also among live fish food sold in an aquarium store. As such the aquarium trade is an active vector. Skistodiaptomus pallidus and S. valkanovi are currently restricted in distribution to constructed ponds and, although they have the potential to spread, eradication may still be possible. However, D. dentifera is widespread and eradication is not feasible. Prevention of further Zooplankton invasions will rely on examination of potential introduction vectors, and adoption of effective management strategies for each vector (e.g., the prevention of the sale of live food containing non‐indigenous species from aquarium stores).

Key words:

• biological invasions
• exotic species
• biosecurity
• aquaria
• invertebrates
• Centropagidae
• Diaptomidae
• Cladocera