Lake Orta has been interested since 1926 by severe industrial pollution, due to the effluents of a rayon (artificial silk) factory that discharged huge amounts of copper and ammonia. As a consequence, the benthic fauna faced noticeable changes, becoming extremely poor in species. However, after extensive liming (in 1989-90), the biotic communities of the lake showed many signs of recovery, and in 1996 it was decided to study the benthos composition and abundance in detail, to assess whether the lake restoration resulted in a complete recovery of this biotic compartment. Actually, both the small number of taxa, and the low abundance of the benthos, indicate that the sedimentary environment is still very stressed. In fact, albeit this study shows that benthos fauna is actively recolonising Lake Orta bottom, spreading from river mouths, in 1996 the benthic community cannot be considered fully organised
This study seeks to identify the hotspots for the secondary spread of non-indigenous species (NIS) resulting for recreational boating travel patterns across the Mediterranean Sea, and investigate the potential for internal spread within each study region. Three Mediterranean regions will be sampled for: 1) NIS richness in the marinas and NIS richness and abundance from recreational vessels; 2) biopollution level of transient recreational boats; 3) geographic range of NIS within each region; 4) hull cleaning and travel history of recreational boats. The results will then be tested with other abiotic factors to determine which factors are significant in contributing to making some marinas more high-risk for the presence and transfer of alien species. Finally, a spatial connectivity network analysis will be presented of the 30 sampled marinas by combining a risk-level for each marina along with recreational boating travel patterns. Marina selection is based on the busiest marinas for recreational boaters in each region in combination with securing permission and feasibility. Samples for Amathia verticillatum will be collected from each region and genetically tested to determine if they share the same initial or secondary source of invasion.
No abstract
Style: Poster Presentation Theme: Biological Invasions Keywords: alien, non--indigenous species, NIS, Mediterranean, recreational boating. This study seeks to identify the hotspots for the secondary spread of non--indigenous species (NIS) resulting for recreational boating travel patterns across the Mediterranean Sea, and investigate the potential for internal spread within each study region. Three Mediterranean regions will be sampled for: 1) NIS richness in the marinas and NIS richness and abundance from recreational vessels; 2) biopollution level of transient recreational boats; 3) geographic range of NIS within each region; 4) hull cleaning and travel history of recreational boats. The results will then be tested with other abiotic factors to determine which factors are significant in contributing to making some marinas more high--risk for the presence and transfer of alien species. Finally, a spatial connectivity network analysis will be presented of the 30 sampled marinas by combining a risk--level for each marina along with recreational boating travel patterns. Marina selection is based on the busiest marinas for recreational boaters in each region in combination with securing permission and feasibility. Samples for Amathia verticillatum will be collected from each region and genetically tested to determine if they share the same initial or secondary source of invasion.PeerJ PrePrints | https://doi.org/10.7287/peerj.preprints.1588v1 | CC-BY 4.0 Open Access |
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