Deep-burrowing crustaceans – density dependent effects on sediment chemistry, Combined effect of sediment-associated compounds on marine benthic macrofauna, Effects of chemical mixtures on the embryonic development in lobster eggs

Updated 2003-06-24

Deep-burrowing crustaceans – density dependent effects on sediment chemistry Some thalassinidian crustaceans burrow exceptionally deep into the anoxic part of marine sediment where molecular diffusion normally dominates chemical transport. In this study we use tracers and microsensors to monitor the impact of such deep bioturbation. By introducing oxygen as well as advective transport to the buried material a large volume of the sediment is affected by one single burrow, and as animal density increases overlapping effects on sediment chemistry are inevitable. The relationship between burrow density and chemical impact are thus studied and modeled. Combined effect of sediment-associated compounds on marine benthic macrofauna This project investigates sub-lethal effects of complex chemical mixtures in both pristine and contaminated marine sediments. Bioturbated sediment comprises a spatially and temporally dynamic mosaic of redox reactions. By using voltammetric microelectrodes that concurrently measure, in situ, a suite of compounds involved in early diagenesis it is possible to obtain the resolution needed to study such complex and dynamic systems. The combined effects of sediment-associated compounds are primarily studied on two marine mud-shrimps, Calocaris macandreae and Upogebia deltaura. The animals’ behavioral and toxicological responses to dynamic solute matrices and associated (scavenged) anthropogenic heavy metals are studied in boxcore (microcosm) experiments. Particular attention is given to quantifying concentration-response relationships and thresholds, and in identifying physiological mechanisms, with respect to ecologically relevant chemical mixtures. Effects of chemical mixtures on the embryonic development in lobster eggs Here we look at the combined effect of diagenetically generated solutes on the embryos of two decapod lobster species, Homarus gammarus and Nephrops norvegicus. Chemical dynamics in and around egg clutches are studied in detail, using microsensor-technology. Physiological and morphological parameters are monitored to estimate effects on development in embryos exposed to chemical mixtures both in vivo and in vitro. Adult female behavioral response, genetic and ecological differences are also investigated.

Time frame

Status
Ongoing
Project time span
1990 - 2010
Data collection
not specified
Data processing
not specified
Data reporting
not specified

Contact information

Contact person
Susanne Eriksson
Address
Kristineberg Marine Research Station 450 34 Fiskebäckskil Sweden
Phone
+46 (0)523 185 50
Fax
+46 (0)523 185 02
Email
es.ug.fmk@nosskire.ennasus

Parameters and Media

Not specified

Geography

Regions studied
Sweden

Data availability

Samples/specimens archived in specimen banks?
No

Methods & Procedures

Not specified

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
No
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