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Dispersal in free-living, marine, benthic nematodes: passive or active processes?
Stockholm University, Faculty of Science, Department of Zoology.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Meiofauna, and especially marine nematodes are common in sediments around the world. Despite very wide ranging distributions in many nematode species, little is presently known about their dispersal mechanisms shaping these patterns. Rafting, and perhaps ballast water transport has been suggested as viable means for nematode long-range transport. On a much smaller scale other processes have been suggested for their dispersal. They generally include some form of passive suspension into the water column and later on a passive, haphazard settling back towards the bottom.

Small-scale phenomena in nematode dispersal were studied by conducting a series of studies at Askö field station, Trosa Archipelago, Baltic proper. Studied aspects were one case of macrofaunal influence on nematode dispersal rate, using an amphipod, Monoporeia affinis as disturbing agent, and three different studies on mechanisms related to settling. The experiments were conducted both in laboratory and field settings.

The amphipod Monoporeia affinis did not exert any influence on the dispersal rate in the nematodes. The nematode dispersal was only an effect of time, in the aspect that the more time that past, the more nematodes dispersed from their place of origin. The settling experiments revealed that nematodes do have an active component in their settling behaviour, as they were able to exert influence on the spot where they were to settle. They were able to choose settling spot in response to the food quality of the sediment. It also became evident that contrary to common belief, nematodes are able to extend their presence in the water column far beyond the times that would be predicted considering settling velocities and hydrodynamic conditions alone.

Place, publisher, year, edition, pages
Stockholm: Zoologiska institutionen , 2004. , 27 p.
Keyword [en]
Nematod, dispersial, water column, choice, algal mats, disturbance, meiofauna, community
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-77ISBN: 91-7265-836-3 (print)OAI: oai:DiVA.org:su-77DiVA: diva2:198882
Public defence
2004-04-07, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Supervisors
Available from: 2004-03-17 Created: 2004-03-17Bibliographically approved
List of papers
1. Effects of biological disturbance by Monoporeia affinis (Amphipoda) on small-scale migration of marine nematodes in low-energy soft sediments
Open this publication in new window or tab >>Effects of biological disturbance by Monoporeia affinis (Amphipoda) on small-scale migration of marine nematodes in low-energy soft sediments
2003 In: Marine Biology, ISSN 0025-3162, Vol. 143, no 5, 867-874 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25099 (URN)
Note
Part of urn:nbn:se:su:diva-77Available from: 2004-03-17 Created: 2004-03-17Bibliographically approved
2. Do nematodes remain in the water column after suspension events?
Open this publication in new window or tab >>Do nematodes remain in the water column after suspension events?
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25100 (URN)
Note
Part of urn:nbn:se:su:diva-77Available from: 2004-03-17 Created: 2004-03-17 Last updated: 2010-01-13Bibliographically approved
3. Free-living marine nematodes actively choose habitat when descending from the water column
Open this publication in new window or tab >>Free-living marine nematodes actively choose habitat when descending from the water column
2003 In: Marine Ecology Progress Series, ISSN 0171-8630, Vol. 260, 141-149 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25101 (URN)
Note
Part of urn:nbn:se:su:diva-77Available from: 2004-03-17 Created: 2004-03-17Bibliographically approved
4. The clam Macoma balthica prevents in situ growth of algal mats in shallow soft-bottoms: implications for development of meiofaunal assemblages
Open this publication in new window or tab >>The clam Macoma balthica prevents in situ growth of algal mats in shallow soft-bottoms: implications for development of meiofaunal assemblages
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25102 (URN)
Note
Part of urn:nbn:se:su:diva-77Available from: 2004-03-17 Created: 2004-03-17 Last updated: 2010-01-13Bibliographically approved

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