Structure, fonctionnement, évolution des communautés benthiques ...

tel-00009359, version 1 - 1 Jun 2005
Chapitre 3 - Fonctionnement du réseau trophique benthique de la Grande Vasière
Table 1. Bay of Biscay– Sampling sites location, depth (m), benthic community assemblages and sediment
type (according to Chassé and Glémarec, 1976), benthic fishing effort (IFREMER quote) and sediment
characteristics (mean grain size and silt percent).
Sediment
Trawling effort
type
Silt fraction
(%)
Mean grain
size (µm)
(IFREMER
Distance from
Benthic community
quote, months
Depth
Loire estuary
Geographical
(Chassé and
(Chassé and
of trawling
(m)
(St-Nazaire;
coordinates
Station
Glémarec,
Glémarec, 1976)
Sum.
spring
Sum.
spring
activity in
km)
1976)
ICES statistical
Muddy sand
15.52
13.34
187
142
Nucula sulcata
47°13.800 N
High (> 1000)
106
110
A
Brissopsis lyrifera
3°40.200 W
Muddy sand
14.02
19.63
123
123
Medium (50–
500)
Nucula sulcata
46°56.400 N
112
125
B
Brissopsis lyrifera
3°28.800 W
Muddy sand
15.54
15.33
168
143
Onuphis lepta
47°09.000 N
High (> 1000)
118
130
C
Auchenoplax crinita
3°49.800 W
176
Muddy sand
9.60
12.72
178
176
Medium (50–
500)
Onuphis lepta
46°52.800 N
121
145
D
Auchenoplax crinita
3°42.000 W
Medium
biogenic
8.52
-
179
-
46°55.000 N
low ( 1000)
45
55
F
Dosinia lupinus
02°40.300 W
Sandy mud
91.35
56.40