Additional research is required to identify other factors that are likely to influence the utilisation of the proposed MRED structures by valuable commercial species and how to maximise this potential through design modification and site selection. This work was funded under NERC Connect B: Quantifying impacts of artificial reefs on the receiving environment (NER/D/S/2000/01307). My thanks go to Foster Yeoman Limited (now Aggregate Industries Ltd) who undertook the deployment of the Loch Linnhe Reef. I would also like to thank the NERC National Facility for Scientific Diving (NFSD) and diving team for supporting PS-341 molecular weight the diving, the crew of the RV Seol Mara and the efforts

of two anonymous reviewers. “
“Diatoms constitute an important food source for copepods in marine ecosystems but several studies have reported negative effects of diatom diets on copepod recruitment such as lower egg production rates, egg hatching success and/or naupliar survival (recently reviewed by Ianora and Miralto, 2010). Several mechanisms have been proposed for the observed deleterious effects of diatoms: nutritional deficiency (Jónasdóttir and Kiorboe, 1996 and Lacoste et al., 2001), lack

of ingestion by nauplii (Koski, 2008) and presence of inhibitory find more bioactive molecules (Miralto et al., 1999 and Pierson et al., 2005). Many diatom species have in fact been shown to produce inhibitory molecules (Carotenuto

et al., 2002, Ianora et al., 2004 and Poulet et al., 2007), characterized as polyunsaturated aldehydes (see reviews of Pohnert, 2005 and Wichard et al., 2005) and other oxylipins (d’Ippolito et al., 2002a, d’Ippolito et al., 2002b, Fontana et al., 2007a, Miralto et al., 1999 and Pohnert, 2002). Direct effects of these PUAs and oxylipins have been tested on the proliferation of bacteria Etofibrate (Adolph et al., 2004 and Ribalet et al., 2008), phytoplankton (Hansen and Eilertsen, 2007 and Ribalet et al., 2007a) and other organisms of different phyla (Adolph et al., 2004, Caldwell et al., 2005 and Romano et al., 2010). However, very few studies have tested the effects of pure PUAs on copepods (Buttino et al., 2008, Ceballos and Ianora, 2003 and Taylor et al., 2007). Since PUAs are released when diatom cells are wounded during copepod grazing (“sloppy feeding”) (Pohnert, 2000 and Wichard et al., 2007) or lysed from senescent cells during bloom periods (Vidoudez et al., 2011), it should be interesting to determine the direct effects of pure molecules on copepod fitness. Diatom PUAs are reported to act as repellent compounds to reduce and/or avoid grazing in pelagic freshwater grazers of the genera Daphnia, Cyclops and Eudiaptomus ( Jüttner, 2005). However it is unclear whether all copepods are able to discriminate between PUA-producing or non-producing diatoms.