Distribution and abundance of larvae of Palaemon elegans (Decapoda) in the southern Baltic Sea
Journal Title: Biuletyn Instytutu Morskiego - Year 2016, Vol 31, Issue 1
Abstract
The assessment of the appearance of non-indigenous species residing in benthic habitats are primarily based on knowledge obtained from their adult stage. However, many benthic organisms have a planktonic larval stage during their early developmental phase and such a trait is believed to be behind their efficient large-scale spread. The prawn Palaemon elegans invaded into the western part of the Baltic Sea in the 1990s and by 2011 the species had colonized almost the whole sea. Currently, P. elegans has become the most common prawn species inhabiting coastal and open sea areas.The aim of this preliminary survey is to examine spatial distribution, abundance and dispersal capacities of the larvae of P. elegans. Material for the studies was collected from the open waters of the southern Baltic Sea (the Gdańsk and Bornholm Basins and the Słupsk Furrow) in summers 2007 and 2008. Larvae (zoeal stages) and also post larval stages of P. elegans were common in the whole study area and their densities were highest in the Bornholm Basin. Their maximum abundance reached up to 500 ind. · 1000 m-3 in August 2007. In the Słupsk Furrow and the Gdańsk Basin these prawns were found in much lower numbers (about 10 ind. · 1000 m -3). The current study indicates that the dispersal of the larvae of P. elegans with the water currents is one plausible mechanism of the large scale spread of this invasive species to the south-eastern coast of the Baltic Sea as well as, the study confirmed, that the new prawn has high reproductive potential.
Authors and Affiliations
Diana Dziaduch
Keywords
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