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Schulz, Jan; Hirche, Hans-Juergen (2007): Weighted mean depth of zooplankton measured during various cruises to the Baltic Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758060, Supplement to: Schulz, J; Hirche, H-J (2007): Living below the halocline: strategies of deep-living species in the highly stratified brackish Bornholm Basin (central Baltic Basin). Journal of Plankton Research, 29(10), 881-894, https://doi.org/10.1093/plankt/fbm066

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Abstract:
The Baltic Sea is the largest brackish water area of the world. On the basis of the data from 16 cruises, we show the seasonal and vertical distribution patterns of the appendicularians Fritillaria borealis, Oikopleura dioica and the cyclopoid copepod Oithona similis, in the highly stratified Bornholm Basin. These species live at least temporarily below the permanent halocline and use different life strategies to cope with the brackish environment. The cold-water species F. borealis is abundant in the upper layers of the water column before the thermocline develops. With the formation of the thermocline abundance decreases and the specimens outlast higher temperatures below the halocline. Distribution and strategy suggest that F. borealis might be a glacial relict species in the Baltic Sea. Although Oikopleura dioica is only abundant during summer, O. similis is present all year round. Both species have in common that their vertical distribution is restricted to the waters below the halocline, most likely due to their requirements of higher salinities. We argue that the observed strategies are determined by ecophysiological constraints and life history traits. These species share an omnivorous feeding behaviour and the capability to utilise a spectra of small particles as food. As phytoplankton concentration is negligible below the halocline, we suggest that these species feed on organic material and heterotrophic organisms that accumulate in the density gradient of the halocline. Therefore, the deep haline waters in the Baltic Sea represent a habitat providing shelter from predation and food supply for adapted species that allows them to gather sufficient resources and to maintain populations.
Project(s):
Global Ocean Ecosystem Dynamics (GLOBEC)
Coverage:
Median Latitude: 55.284318 * Median Longitude: 15.722584 * South-bound Latitude: 54.618833 * West-bound Longitude: 14.976167 * North-bound Latitude: 55.642833 * East-bound Longitude: 16.514667
Date/Time Start: 2002-03-17T21:50:00 * Date/Time End: 2003-05-31T04:02:00
Event(s):
AL200/1_330-ZNET_1 (BB0003) * Latitude: 55.626000 * Longitude: 15.032667 * Date/Time: 2002-04-04T04:15:00 * Elevation: -77.0 m * Location: Baltic Sea * Campaign: AL200/1 (GG02_02a) * Basis: Alkor (1990) * Method/Device: Zooplankton net (ZNET)
AL200/1_333-ZNET_2 (BB0006) * Latitude: 55.624667 * Longitude: 15.764333 * Date/Time: 2002-04-04T09:30:00 * Elevation: -71.0 m * Location: Baltic Sea * Campaign: AL200/1 (GG02_02a) * Basis: Alkor (1990) * Method/Device: Zooplankton net (ZNET)
AL200/1_339-ZNET_3a (BB0012) * Latitude: 55.622167 * Longitude: 16.488667 * Date/Time: 2002-04-04T18:50:00 * Elevation: -65.0 m * Location: Baltic Sea * Campaign: AL200/1 (GG02_02a) * Basis: Alkor (1990) * Method/Device: Zooplankton net (ZNET)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
16 datasets

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Datasets listed in this publication series

  1. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL200/1. https://doi.org/10.1594/PANGAEA.706285
  2. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL200/2. https://doi.org/10.1594/PANGAEA.706286
  3. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL205. https://doi.org/10.1594/PANGAEA.706287
  4. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL207. https://doi.org/10.1594/PANGAEA.706288
  5. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL210. https://doi.org/10.1594/PANGAEA.706290
  6. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL217. https://doi.org/10.1594/PANGAEA.706291
  7. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL219. https://doi.org/10.1594/PANGAEA.706292
  8. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during ALKOR cruise AL220/2. https://doi.org/10.1594/PANGAEA.706293
  9. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during Alexander von Humboldt cruise AvH44/02/03. https://doi.org/10.1594/PANGAEA.706294
  10. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during Alexander von Humboldt cruise AvH44/02/08/2. https://doi.org/10.1594/PANGAEA.706295
  11. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during Alexander von Humboldt cruise AvH44/02/11. https://doi.org/10.1594/PANGAEA.706296
  12. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during Alexander von Humboldt cruise AvH44/03/01. https://doi.org/10.1594/PANGAEA.706297
  13. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during HEINCKE cruise HE168/1. https://doi.org/10.1594/PANGAEA.706298
  14. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during HEINCKE cruise HE174. https://doi.org/10.1594/PANGAEA.706289
  15. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during HEINCKE cruise HE181. https://doi.org/10.1594/PANGAEA.706299
  16. Schulz, J; Hirche, H-J (2007): Weighted mean depth of zooplankton during HEINCKE cruise HE182. https://doi.org/10.1594/PANGAEA.706300