Dietary overlap in inshore notothenioid fish from the Danco Coast, western Antarctic Peninsula

Figures & data

Fig. 1  The location of Cierva Point at the Danco Coast, western Antarctic Peninsula.

Fig. 2  Location of the sampling sites in the proximity of Cierva Point, Danco Coast, western Antarctic Peninsula.

Table 1 Diet composition of the fish sampled at the Danco Coast, western Antarctic Peninsula

	G. gibberifrons		L. nudifrons		N. coriiceps		N. rossii		T. bernacchii		T. newnesi		P. charcoti
	N%^a	M%^b	N%	M%	N%	M%	N%	M%	N%	M%	N%	M%	N%	M%
Algae	1.9	1.9	4.4	1.2	9.3	37.3	17.7	48.0	–	–	–	–	–	–
Errant polychaetes	2.7	11.2	7.6	21.9	0.9	0.4	–	–	–	–	–	–	–	–
Gastropods
Nacella concinna	1.9	9.3	–	–	2.9	3.9	–	–	–	–	–	–	–	–
Sp. A	1.9	0.9	14.1	5.5	13.1	1.1	–	–	10.2	4.3	–	–	–	–
Bivalves
Clams	16.9	8.1	–	–	0.2	0.1	–	–	–	–	–	–	–	–
Laternula elliptica	0.2	3.1		0.0	0.0	–	–	–	–	–	–	–	–
Chitons	1.1	1.6	2.2	0.2	0.1	0.0	–	–	–	–	–	–	–	–
Squids	–	–	–	–	0.0	0.2	–	–	–	–	–	–	–	–
Euphausiids
Euphausia superba	0.1	0.3	3.3	6.3	15.5	7.1	76.5	48.0	2.0	0.7	98.2	99.6	16.7	0.3
Decapods	–	–	–	–	0.0	0.1	–	–	–	–	–	–	8.3	2.0
Amphipods
Gammarideans
Bovallia gigantea	1.5	5,7	18.5	45.8	5.2	2.6	–	–	20.4	34.1	–	–	–	–
Fuegiphoxus sp.	30.4	7.7	2.2	0.2	19.7	0.8	–	–	–	–	–	–	–	–
Gondogeneia sp.	8.6	2.5	28.3	11.0	1.5	0.1	–	–	38.8	8.2	–	–	–	–
Hippomedon sp.	0.9	0.4	0.0	0.0	3.4	0.3	–	–	6.1	1.5	–	–	–	–
Orchomenella sp.	11.6	1.6	3.3	0.4	0.6	0.1	–	–	–	–	0.4	0.0	–	–
Prostebeingia longicornis	4.2	2.8	16.3	7.6	9.1	0.9	–	–	14.3	7.5	0.6	0.2	–	–
Vibilia sp.	4.4	1.4	–	–	0.0	0.0	–	–	–	–	0.1	0.0	–	–
Waldeckia obesa	–	–	–	–	0.0	0.0	–	–	–	–	–	–	–	–
Eusiridae unidentified	0.1	0.6	–	–	0.1	0.1	–	–	–	–	–	–	–	–
Sp. B	2.1	2.0	–	–	0.8	0.2	–	–	–	–	–	–	–	–
Hyperiids	0.5	0.0	–	–	0.5	0.1	–	–	–	–	0.6	0.0	–	–
Isopods
Glyptonotus antarcticus	0.1	1.4	–	–	0.2	1.5	–	–	–	–	–	–	–	–
Serolis sp.	5.2	10.7	–	–	5.7	1.9	–	–	–	–	–	–	–	–
unidentified	0.1	0.0	–	–	0.0	0.0	–	–	–	–	–	–	–	–
Ophiuroids	0.5	3.8	–	–	0.0	0.0	–	–	–	–	–	–	–	–
Echinoids
Sterechinus neumayeri	0.0	0.0	–	–	0.1	0.0	–	–	–	–	–	–	–	–
Nemerteans	0.0	0.7	–	–	0.1	0.2	–	–	–	–	–	–	–	–
Priapulids	0.8	8.4	–	–	0.0	0.0	–	–	–	–	–	–	8.3	0.6
Asciids	0.2	1.8	–	–	1.3	0.9	–	–	4.1	6.1	0.1	0.0	–	–
Salps	2.1	11.2	–	–	8.0	7.0	5.9	4.0	4.1	37.7	0.1	0.1	–	–
Fish	0.1	0.8	–	–	2.0	33.0	–	–	–	–	–	–	66.7	97.1

^aImportance by number percent.

^bImportance by mass percent.

Table 2 Reoccurrence of prey (Tyler's method) among seven fish species at the Danco Coast, western Antarctic Peninsula.

	G. gibberifrons	L. nudifrons	N. coriiceps	N. rossii	T. bernacchii	T. newnesi	P. charcoti	No. of reoccurrence
Algae	+	+	+	+				3
Errant polychaetes	+	+	+					2
Gastropods
Nacella concinna	+		+					1
Sp. A	+	+	+		+			3
Bivalves
Clams	+		+					1
Laternula elliptica	+							0
Chitons	+	+	+					2
Squids			+					0
Euphausiids
Euphausia superba	+	+	+	+	+	+	+	6
Decapods			+				+	1
Amphipods
Gammarideans
Bovallia gigantea	+	+	+		+			3
Fuegiphoxus sp.	+	+	+					3
Gondogeneia sp.	+	+	+		+			3
Hippomedon sp.	+	+	+		+			3
Orchomenella sp.	+	+	+			+		3
Prostebeingia longicornis	+	+	+		+	+		4
Vibilia sp.	+		+			+		2
Waldeckia obesa	+		+					1
Eusiridae unidentified	+		+					1
Sp. B	+		+					1
Hyperiids	+		+			+		2
Isopods
Glyptonotus antarcticus	+		+					1
Serolis sp.	+		+					1
unidentified	+		+					1
Ophiuroids	+
Echinoids
Sterechinus neumayeri			+					0
Nemerteans	+		+					1
Priapulids	+		+				+	2
Asciids	+		+		+	+		3
Salps	+		+	+	+	+		4
Fish	+		+				+	2
Total reoccurrences								60
Maximum reoccurrence possible								186
% of reoccurrences								32.2

Table 3 Percentage dietary overlap by weight (index S) between fish species pairs at the Danco Coast, western Antarctic Peninsula.

	G. gibberifrons	L. nudifrons	N. coriiceps	N. rossii	T. bernacchii	T. newnesi	P. charcoti
G. gibberifrons	–	25.3	25.5	6.2	26.0	0.7	1.7
L. nudifrons		–	13.3	7.5	54.8	6.7	0.3
N. coriiceps			–	48.4	18.9	7.5	33.4
N. rossii				–	4.7	48.4	0.3
T. bernacchii					–	1.1	0.3
T. newnesi						–	0.6
P. charcoti							–