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Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.jmarsys.2005.11.005 |
| Title (Primary) | Effect of river run-off on the distribution of marine invertebrate larvae in the southern Kara Sea (Russian Arctic) |
| Author | Fetzer, I.; Deubel, H. |
| Source Titel | Journal of Marine Systems |
| Year | 2006 |
| Department | UMB |
| Volume | 60 |
| Issue | 1-2 |
| Page From | 98 |
| Page To | 114 |
| Language | englisch |
| Keywords | Arctic Ocean; Russia; Kara Sea; benthos; juveniles; meroplankton; river run-off; Lat 70-78 degrees N; Lon 70-90 degrees E |
| Abstract | Within the generally oligotroph Arctic marine environment river outlets are favoured by many planktonic and benthic organisms due to their high input of organic carbon. The retention of pelagic larvae within nursery grounds and/or the ability to return to their parental grounds prior to settlement is one important factor for the persistence of benthic communities in such river influenced areas. The southern Kara Sea is strongly controlled by high freshwater inputs from the Ob and Yenisei Rivers, which create a pronounced bi-layered pycnocline with a warm fresh/brackish water layer on top and a cold high saline marine layer below. The dispersal of five meroplanktonic species and settled juveniles (the brittle star Ophiocten sericeum, and the polychaetes Micronephtys minuta, Neremyra aphroditoides, Phyllodoce groenlandica and Prionospio cirrifera) in relation to the adult distribution patterns was investigated. For all apart from R cirrifera the highest densities of larvae were found in the upper brackish water layer. To assess size-at-settlement, the body sizes of larvae and newly settled juveniles were estimated and compared. Dispersal patterns ranged from virtually no adaption to river run-off as in the common, sterrohaline O. sericeum and M minuta (7 ind. m(-3), 459 mu m) to local retention as in N. aphroditoides (7 ind. m(-3), 541 mu m) and R groenlandica (0.5 ind. m(-3), 1121 mu m) retained by horizontal eddies created by the outflow. Adults of P cirrifera, which were exclusively restricted to the estuary of the Yenisei River, showed a well adapted reproductive behaviour to ensure a high retention potential of their progenies. The larvae (1.5 ind. m(-3), 1513 mu m) were only present in the lower water layers, most probably taking advantage of the prevailing near bottom counter current retaining them within their hatching areas. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=2607 |
| Fetzer, I., Deubel, H. (2006): Effect of river run-off on the distribution of marine invertebrate larvae in the southern Kara Sea (Russian Arctic) J. Mar. Syst. 60 (1-2), 98 - 114 10.1016/j.jmarsys.2005.11.005 |
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