5.3 Settlement and Dispersal of Macrofauna
139
but by metabolic products of microorganisms. Until now examples for such relationships are only known from macrofauna species settling on hard substrate
(compare Rodriguez et al. 1993 and references therein). Future investigations
should test, whether chemical cues playa role in initial settlement of H. filiformis.
2000
1500
(/l
qj
::J
1J 1000
S
'6
c
500
0
Mar
-+
--+I ::
~
\
•
Ii
Otzumer 8alje [n m- 3 ]
Groninger Plate [n catch- 1 ]
Harbour of Neuharlingersiel [n m- 3 )
May Jun Jul Aug Sep Oct Nov Dec
1995
}<-ig. 5.3.2 Seasonal development of larval numbers of Lanice conchilega at several sampling
sites in the backbarrier system of Spiekeroog island (tidal inlet Otzumer Balje, sandflat
Groninger Plate (GP3) and harhour of Neuharlingersiel, see Fig. 3.1.2). high tide samples 1995
(unpublished data from Boysen-Ennen . .Iaklin and Heuers)
Fig. 5.3.3 Temporal development of larval numhers of Lanice conchilega caught in driftnets at 5
sampling sites (1994. Gp2 to GP6. see Fig. 3.1.4) on the Groninger Plate (Jaklin, Reinhard,
unpuhlished data)