Table 7.5.1 (continued)
Norderncy
Unaffected species
Arenicola marina
Corophium
arenartwn
Eteone longa
Nereis diversicolor
Pygospio eiegam'
East Frisian coast
Dornumer Nacken
Arenicola marina
Mamma balthica
Extremely good recruitment
Cerastoderma edule
Cerastoderma
Hydrobia ulvae
edule
Macol1la balthica
Macoma balthica
Mya arcllar;a
Mya {[re!laria
Nereis diversicolor
Pygospio eiega!ls
Poor recruitment
Lallice collchilega
Nepthys hombergii
7.5 Comparison of Ice Winter Effects
203
Spiekeroog
Arenicola marina
Pygospio elegans
Scoloplos armiger
Heteromastus
filiformis
Hydrobia ulvae
Mytilus edulis
Nereis diversimlor
Pygospio elegalls
highest:
Mya arenaria
Carcinus mae !las
Lanice collchilega
Malmgelliella
lunulata
North Frisian coast
SyIt
Macoma balthica
Mya arenaria
Mytilus edulis
highest:
Capitella capitata
Cera.l'toderma
edule
Nereis diversicolor
Phyl/odoce
mucosa
Carcinus maellas
Lallice conchi/ega
Nephtys hombergii
It appears that the subtidal parts of the macrofauna populations were not
strongly affected by the ice winter in the North Frisian Wadden Sea near Sylt
(Strasser, pers. comm.). According to results from Beukema et al. (1988), which
showed stronger subtidal effects of ice winters the more north-westerly the area of
investigation was situated, one should have assumed that effects of low temperatures should extend far into the subtidal especially at the North Frisian coast. Adversely, at the East Frisian part of the Wadden Sea, the subtidal parts of the population of at least L. (,of/chi/ega were severely affected, eventually caused by
upwelling of cold water.
The comparison of both regions elucidates that the main differences in ice winter effects take place in the subsequent seasonal development in the pelagic system
(dominating algal species. temporal dynamics of meroplankton). In the benthos of
both regions. the expected effects on cold sensitive species were observed. followed by a localized good recruitment of some macrofauna species.
Norderncy
Unaffected species
Arenicola marina
Corophium
arenartwn
Eteone longa
Nereis diversicolor
Pygospio eiegam'
East Frisian coast
Dornumer Nacken
Arenicola marina
Mamma balthica
Extremely good recruitment
Cerastoderma edule
Cerastoderma
Hydrobia ulvae
edule
Macol1la balthica
Macoma balthica
Mya arcllar;a
Mya {[re!laria
Nereis diversicolor
Pygospio eiega!ls
Poor recruitment
Lallice collchilega
Nepthys hombergii
7.5 Comparison of Ice Winter Effects
203
Spiekeroog
Arenicola marina
Pygospio elegans
Scoloplos armiger
Heteromastus
filiformis
Hydrobia ulvae
Mytilus edulis
Nereis diversimlor
Pygospio elegalls
highest:
Mya arenaria
Carcinus mae !las
Lanice collchilega
Malmgelliella
lunulata
North Frisian coast
SyIt
Macoma balthica
Mya arenaria
Mytilus edulis
highest:
Capitella capitata
Cera.l'toderma
edule
Nereis diversicolor
Phyl/odoce
mucosa
Carcinus maellas
Lallice conchi/ega
Nephtys hombergii
It appears that the subtidal parts of the macrofauna populations were not
strongly affected by the ice winter in the North Frisian Wadden Sea near Sylt
(Strasser, pers. comm.). According to results from Beukema et al. (1988), which
showed stronger subtidal effects of ice winters the more north-westerly the area of
investigation was situated, one should have assumed that effects of low temperatures should extend far into the subtidal especially at the North Frisian coast. Adversely, at the East Frisian part of the Wadden Sea, the subtidal parts of the population of at least L. (,of/chi/ega were severely affected, eventually caused by
upwelling of cold water.
The comparison of both regions elucidates that the main differences in ice winter effects take place in the subsequent seasonal development in the pelagic system
(dominating algal species. temporal dynamics of meroplankton). In the benthos of
both regions. the expected effects on cold sensitive species were observed. followed by a localized good recruitment of some macrofauna species.