Diet and feeding ecology of Eriocheir sinensis on the Polish coast of the Baltic Sea and in the Tagus Estuary, Portugal

Figure 1

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Figure 3

The number of individuals and carapace width (mean ± SD) of E_ sinensis females and males collected from the Gulf of Gdańsk, the Vistula Lagoon and the Tagus Estuary_ The same letters indicate no significant differences (Wilcoxon matched pair test; p > 0_05)

Site	Number of individuals	Carapace width (mm)
		Average	Range
Gulf of Gdańsk	49	62.00 ±7.80	43.00–82.00
Females	20	61.26 ± 7.90a	46.90–82.00
Males	29	62.29 ± 7.75a	43.00–78.60
Vistula Lagoon	200	66.77 ± 8.38	33.26–89.07
Females	89	67.04 ± 6.38b	53.70–81.49
Males	111	66.56 ± 9.22b	33.26–89.07
Tagus Estuary	38	44.35 ± 6.27	20.63–56.42
Females	21	43.88 ± 7.29c	20.63–44.53
Males	17	44.93 ± 4.87c	37.83–56.42

The number of specimens with different food remains in their stomachs collected in the Gulf of Gdańsk, the Vistula Lagoon and the Tagus Estuary_ Not all remains were taxonomically identified (ni – not identified)

	Gulf of Gdańsk	Vistula Lagoon	Tagus Estuary
Plant origin	6	133	33
Chlorophyta	6	16	ni
Tracheophyta	0	50	ni
No taxonomic identification	0	67	33
Animal origin	25	57	13
Crustacea	4	1	ni
Bivalvia	16	29	ni
Amphipoda	3	2	ni
Gastropoda	2	1	ni
Polychaeta	0	5	ni
No taxonomic identification	0	16	13
Detritus	5	28	0