Hydrographic changes push European common squid Alloteuthis subulata
into Kiel Bay
Marko Herrmann & Uwe Piatkowski,
Institut für Meereskunde an der Universität Kiel, Düsternbrooker Weg 20, D – 24105 Kiel, Germany contact: mherrmann@ifm.uni-kiel.de & upiatkowski@ifm.uni.kiel.de
In total, 142 specimens of Alloteuthis subulata were collected.
The collection included 51 % females and 46 % males. Dorsal mantle lengths (DML) varied between 25-85 mm in females and between 27-98 mm in males. Wet body mass ranged between 0,6-7,9 g in females and 2,1-8,7 g in males.
Lower rostral lengths (LRL) varied between 0,31-1,07 mm in females and 0,42-1,15 mm in males.
European common squid (Alloteuthis subulata Lamarck, 1798) were sampled from the by-catch of ICES bottom-trawl survey of FRV Walter Herwig III in the North Sea in February 2000, from collect survey of RV Littorina in the Kattegat in November 2000 and from survey of FS Alkor in Kiel Bay, western Baltic Sea in January 2001.
Map showing the study area:
1. St. n = 73, 2. St. n = 51, 3. St. n = 18
Station 3
0 5 10 15 20 25 30
0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90 90-95 95-100 DML [mm]
frequency [%]
Fig.3
Station 2
0 5 10 15 20 25 30
0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90 90-95 95-100 DML [mm]
frequency [%]
Fig.2
Station 1
0 5 10 15 20 25 30
0-5 5-10 10-15 15-20 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90 90-95 95-100 DML [mm]
frequency [%]
Fig.1
Fig.1-3 shows the frequency distribution of dorsal mantle lengths (DML).
Station 2
0 5 10 15 20 25 30
0,20-0,25 0,25-0,30 0,30-0,35 0,35-0,40 0,40-0,45 0,45-0,50 0,50-0,55 0,55-0,60 0,60-0,65 0,65-0,70 0,70-0,75 0,75-0,80 0,80-0,85 0,85-0,90 0,90-0,95 0,95-1,00 1,00-1,05 1,05-1,10 1,10-1,15 1,15-1,20 LRL [mm]
Häufigkeit [%]
Fig.5
Station 3
0 5 10 15 20 25 30
0,20-0,25 0,25-0,30 0,30-0,35 0,35-0,40 0,40-0,45 0,45-0,50 0,50-0,55 0,55-0,60 0,60-0,65 0,65-0,70 0,70-0,75 0,75-0,80 0,80-0,85 0,85-0,90 0,90-0,95 0,95-1,00 1,00-1,05 1,05-1,10 1,10-1,15 1,15-1,20 LRL [mm]
frequency [%]
Fig.6
Station 1
0 5 10 15 20 25 30
0,20-0,25 0,25-0,30 0,30-0,35 0,35-0,40 0,40-0,45 0,45-0,50 0,50-0,55 0,55-0,60 0,60-0,65 0,65-0,70 0,70-0,75 0,75-0,80 0,80-0,85 0,85-0,90 0,90-0,95 0,95-1,00 1,00-1,05 1,05-1,10 1,10-1,15 1,15-1,20 LRL [mm]
frequency [%]
Fig.4
A.subulata, ventral view DML = 43 mm
M = 3 g
Fig.4-6 shows the frequency distribution of lower rostral lengths (LRL).
Station 2
0 5 10 15 20 25 30
0,0-0,5 0,5-1,0 1,0-1,5 1,5-2,0 2,0-2,5 2,5-3,0 3,0-3,5 3,5-4,0 4,0-4,5 4,5-5,0 5,0-5,5 5,5-6,0 6,0-6,5 6,5-7,0 7,0-7,5 7,5-8,0 8,0-8,5 8,5-9,0 9,0-9,5 9,5-10,0 wet body mass [mm]
frequency [%]
Fig.8
Station 3
0 5 10 15 20 25 30
0,0-0,5 0,5-1,0 1,0-1,5 1,5-2,0 2,0-2,5 2,5-3,0 3,0-3,5 3,5-4,0 4,0-4,5 4,5-5,0 5,0-5,5 5,5-6,0 6,0-6,5 6,5-7,0 7,0-7,5 7,5-8,0 8,0-8,5 8,5-9,0 9,0-9,5 9,5-10,0 wet body mass [mm]
frequency [%]
Fig.9
Station 1
0 5 10 15 20 25 30
0,0-0,5 0,5-1,0 1,0-1,5 1,5-2,0 2,0-2,5 2,5-3,0 3,0-3,5 3,5-4,0 4,0-4,5 4,5-5,0 5,0-5,5 5,5-6,0 6,0-6,5 6,5-7,0 7,0-7,5 7,5-8,0 8,0-8,5 8,5-9,0 9,0-9,5 9,5-10,0 w et body mass [m m ]
frequency [%]
Fig.7
lower beak, LRL = 0,84 mm
Fig.6-8 shows the frequency distribution of wet body mass.
upper beak, ULR = 0,92 mm
