Abstract


SURVIVAL AND BIOTURBATION EFFECTS OF COMMON MARINE MACROFAUNA IN COASTAL SOILS NEWLY FLOODED WITH SEAWATER

Low-lying coastal soils are at risk of being permanently flooded due to global sea level rise, but how will these areas develop as habitat for marine species? We conducted an experiment to evaluate the habitat quality of newly flooded soils for common marine polychaetes (<em>Marenzelleria</em> <em>viridis</em>, <em>Nereis</em> <em>diversicolor</em> and <em>Scoloplos</em> <em>armiger</em>). Soil cores were collected at Gyldensteen Strand (Northern Fyn, Denmark), where a 200 ha area is designated for flooding as part of a nature restoration project. Soils cores were experimentally flooded with seawater for 1 month before adding polychaetes. We measured the effect of polychaetes on CO<sub>2</sub> and nutrient fluxes for 4 weeks, and quantified their survival and bioirrigation activity. Results show that polychaetes stimulate benthic metabolism and nutrient release in flooded soil and therefore accelerate the transformation of soils into sediments. Furthermore, some species (<em>M.</em> <em>viridis</em>) decreased bioirrigation activity and show avoidance behavior when exposed to flooded soil, while others (<em>N.</em> <em>diversicolor</em> and <em>S.</em> <em>armiger</em>) were unaffected. Overall it appears that newly flooded coastal soils can rapidly support diverse communities of macrofauna.

Authors

Valdemarsen, T. B., University of Southern Denmark, Denmark, valdemarsen@biology.sdu.dk

Quintana, C. O., University of Sao Paulo, Brazil, cintiaorgano@gmail.com

Thorsen, S. W., University of Southern Denmark, Denmark, sandrawt@biology.sdu.dk

Kristensen, E. B., University of Southern Denmark, Denmark, ebk@biology.sdu.dk

Details

Oral presentation

Session #:120
Date: 2/24/2015
Time: 09:30
Location: Press Room (Floor 2)

Presentation is given by student: No