International arrivals: widespread bioinvasions in European Seas

Abstract

The European Union lacks a comprehensive framework to address the threats posed by the introduction and spread of marine non-indigenous species (NIS). Current efforts are fragmented and suffer substantial gaps in coverage. In this paper we identify and discuss issues relating to the assessment of spatial and temporal patterns of introductions in European Seas (ES), based on a scientifically validated information system of aquatic non-indigenous and cryptogenic species, AquaNIS. While recognizing the limitations of the existing data, we extract information that can be used to assess the relative risk of introductions for different taxonomic groups, geographic regions and likely vectors. The dataset comprises 879 multicellular NIS. We applied a country-based approach to assess patterns of NIS richness in ES, and identify the principal introduction routes and vectors, the most widespread NIS and their spatial and temporal spread patterns. Between 1970 and 2013, the number of recorded NIS has grown by 86, 173 and 204% in the Baltic, Western European margin and the Mediterranean, respectively; 52 of the 879 NIS were recorded in 10 or more countries, and 25 NIS first recorded in European seas since 1990 have since been reported in five or more countries. Our results highlight the ever-rising role of shipping (commercial and recreational) as a vector for the widespread and recently spread NIS. The Suez Canal, a corridor unique to the Mediterranean, is responsible for the increased introduction of new thermophilic NIS into this warming sea. The 2020 goal of the EU Biodiversity Strategy concerning marine Invasive Alien Species may not be fully attainable. The setting of a new target date should be accompanied by scientifically robust, sensible and pragmatic plans to minimize introductions of marine NIS and to study those present.

‘Double trouble’: the expansion of the Suez Canal and marine bioinvasions in the Mediterranean Sea

“…Of nearly 700 multicellular non-indigenous species (NIS) currently recognized from the Mediterranean Sea, fully half were introduced through the Suez Canal since 1869 (Galil et al 2014). This is one of the most potent mechanisms and corridors for invasions by marine species known in the world.…”

Identification of a non-native <em>Cynoscion</em> species (Perciformes: Sciaenidae) from the Gulf of Cádiz (southwestern Spain) and data on its current status

“…Fishes are one of the largest contributors to the total number of non-indigenous species documented in European seas, accounting for 16.8% of the 879 multicellular non-indigenous species reported by Galil et al (2014). However, most of these fish species are found in the Mediterranean, introduced via the Strait of Gibraltar (Atlantic species) and the Suez Canal (Lessepsian species) (Oral 2010).…”

European Marine Biodiversity Monitoring Networks: Strengths, Weaknesses, Opportunities and Threats

“…Therefore, one of the major issues still to be solved is the establishment of an internationally coordinated monitoring system for NIS/Cryptogenic Species in the Baltic Sea and in other areas (Olenin et al, 2011). However, because of the high degree of concern regarding NIS emanating from the Suez Canal into the Mediterranean Sea, then this has resulted in more information available for parts of the Mediterranean Sea (Galil et al, 2014).…”