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180606s2002 xx |||||o 00| ||eng c |
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|a (DE-627)JST114379262
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|a (JST)24865182
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Hiddink, J. G.
|e verfasserin
|4 aut
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| 245 |
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|a Changes in distribution and decrease in numbers during migration of the bivalveMacoma balthica
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|c 2002
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
|b c
|2 rdamedia
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|a Online-Ressource
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|a ABSTRACT: The population development of the 1998 year class of the bivalveMacoma balthicawas studied by repeated sampling of a tidal flat area in the eastern Dutch Wadden Sea from May 1998 to August 2000. The juveniles migrated twice, once in mid-1998 from their primary settlement locations in the low sandy intertidal to the nursery in the high intertidal (spring migration, 25% of all juvenileM. balthicarelocated from low to high intertidal) and once in late 1998/early 1999 from the nursery to the low intertidal and the subtidal (winter migration, between 8 and 15% of all 0-group (less than 1 yr old)M. balthicarelocated from high to low intertidal). During winter,M. balthicamigration was most intensive at the lowest temperatures. Relative to the abundance on the tidal flats, the 1+ group (older than 1 yr)M. balthica(i.e. from the second summer onwards) were rare in the tidal channels of the Wadden Sea and were only slightly more common in the North Sea adjacent to the tidal inlet. During both the spring and winter migration, many bivalves disappeared from the tidal flat population. This could partly be explained by normal mortality and by emigration to the subtidal channels and the North Sea. The remaining mortality was probably due to the risks inherent in migration: predation during pelagic floating or not reaching the right locations. The number of bivalves that disappeared was very high. In spring, slightly more disappeared than relocated. In winter, > 4 times more bivalves disappeared than relocated. Migration is obviously a very dangerous activity, therefore great advantages must be associated with the nursery use that makes such migrations necessary. An analysis of literature data on the density ofM. balthicashows that in the eastern Dutch Wadden Sea, 90% of the population lives in the intertidal, about 10% in the adjacent North Sea, and a negligible fraction in the subtidal channels of the Wadden Sea.
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|a © Inter-Research 2002
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|a Macoma balthica
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|a Nursery
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|a Migration
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| 650 |
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|a Mortality
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| 650 |
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|a Wadden Sea
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| 650 |
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|a Social sciences
|x Human geography
|x Human migration
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| 650 |
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|a Social sciences
|x Population studies
|x Mortality
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| 650 |
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|a Physical sciences
|x Earth sciences
|x Geography
|x Land
|x Rangelands
|x Wetlands
|x Tidal flats
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Bodies of water
|x Seas
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| 650 |
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|a Environmental studies
|x Atmospheric sciences
|x Climatology
|x Seasons
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| 650 |
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4 |
|a Social sciences
|x Population studies
|x Population characteristics
|x Population size
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| 650 |
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4 |
|a Social sciences
|x Human geography
|x Human migration
|x Population migration
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| 650 |
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|a Biological sciences
|x Biology
|x Marine biology
|x Aquatic organisms
|x Plankton
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| 650 |
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|a Business
|x Industry
|x Industrial sectors
|x Manufacturing industries
|x Consumer goods industries
|x Clothing industry
|x Clothing
|x Clothing accessories
|x Footwear
|x Overshoes
|x Spats
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Zoology
|x Animals
|x Young animals
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| 655 |
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|a research-article
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1 |
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|a Wolff, W. J.
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Marine Ecology Progress Series
|d Inter-Research, 1979
|g 233(2002) vom: Mai, Seite 117-130
|w (DE-627)320617998
|w (DE-600)2022265-8
|x 16161599
|7 nnns
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| 773 |
1 |
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|g volume:233
|g year:2002
|g month:05
|g pages:117-130
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|u https://www.jstor.org/stable/24865182
|3 Volltext
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|d 233
|j 2002
|c 05
|h 117-130
|