Diet composition and feeding habits of the eyespot skate, <i>Atlantoraja cyclophora</i> (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Barbini, Santiago A.; Lucifora, Luis O.

doi:10.1590/1982-0224-20160032

Santiago A. Barbini

Laboratorio de Ictiología, Instituto de Investigaciones Marinas y Costeras, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Funes 3350, Mar del Plata, B7602AYL, Buenos Aires, Argentina. sbarbini@mdp.edu.ar (corresponding author)

Luis O. Lucifora

Instituto de Biología Subtropical - Iguazú, Universidad Nacional de Misiones, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Casilla de Correo 9, Puerto Iguazú, N3370AVQ, Misiones, Argentina. luis.lucifora@conicet.gov.ar

Figures (5)
Tables (2)

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Fig. 1
Study area showing the location of trawl stations (black dots) and cells of the fishing grid (black rectangles) where individuals of Atlantoraja cyclophora were captured off North Argentina and Uruguay.

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Fig. 2
Cumulative mean Shannon diversity index as a function of sample size for prey of Atlantoraja cyclophora from off Uruguay and northern Argentina. Dashed lines indicate standard deviation.

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Fig. 3
Changes in consumption of different prey with body size, maturity stage, season and region of Atlantoraja cyclophora from off Uruguay and northern Argentina estimated by generalized linear models for number of shrimps, crabs and teleosts. In shrimps: warm season with solid lines and open circles; cold season with dashed lines and solid circles. In teleosts: north region with solid lines and open circles; south region with dashed lines and solid circles.

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Fig. 4
Mean number of shrimps and teleosts consumed for Atlantoraja cyclophora from off Uruguay and northern Argentina by season and region, respectively.

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Fig. 5
Quantile regressions of carapace width (CW) of crabs, cephalothorax length (CL) of shrimps and total length (TL) of teleosts and total length of Atlantoraja cyclophora . The solid, dashed and dotted lines are 5%, 50% and 95% quantile regressions, respectively.

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Table 1
Diet composition of Atlantoraja cyclophora off Uruguay and northern Argentina. %O, percentage frequency of occurrence; %N, percentage by number; %W, percentage by weight; IRI, index of relative importance; %IRI, percentage IRI.

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Table 2
Best models explaining the consumption in number of the main prey category of Atlantoraja cyclophora off Uruguay and northern Argentina. TL: total length; AIC: Akaike Information criterion; w: Akaike weights. The coefficients of the models are relative to mature individuals, north region and warm season. Standard error in parentheses.

Prey		%O	%N	%W	IRI	%IRI
TELEOSTEI		42.98	19.28	59.78	3398.4	28.54
Unidentified teleosts		24.18	8.34	15.29	571.38
Engraulidae	Anchoa marinii	0.30	0.18	0.45	0.19
	Engraulis anchoita	0.60	0.18	0.42	0.36
Ophididae	Raneya brasiliensis	2.98	1.11	3.12	12.64
Batrachoididae	Porichthys porosissimus	2.69	0.83	5.31	16.50
Triglidae	Prionotus nudigula	1.19	0.37	0.74	1.33
Serranidae	Dules auriga	9.55	4.17	16.21	194.71
Carangidae	Trachurus lathami	2.69	1.02	5.51	17.54
Mullidae	Mullus argentinae	1.19	0.37	5.58	7.10
Pinguipedidae	Pinguipes brasilianus	0.30	0.09	0.79	0.26
Paralychthyidae	Etropus longimanus	2.69	1.30	2.52	10.27
Cynoglossidae	Symphurus spp.	3.28	1.30	3.83	16.85
ELASMOBRANCHII
Rajidae		0.89	0.56	0.19	16.85		0.67	<0.01
CRUSTACEA							0.67	<0.01
Decapoda		73.43	77.57	38.18	8500.1	71.37
Lysiosquillidae	Heterosquilla platensis	0.30	0.09	0.05	0.04
Unidientified shrimps		17.31	13.44	4.81	315.98
Penaeidae	Artemesia longinaris	22.10	30.12	7.23	825.14
Solenoceridae	Pleoticus muelleri	13.73	13.44	9.12	309.82
Caridae		0.30	0.46	0.01	0.14
Crangonidae	Pontocaris boschii	13.13	5.84	2.86	114.28
Unidentified Brachyura		16.42	8.34	4.26	206.82
Majidae	Eurypodius latreillei	0.30	0.18	0.09	0.08
	Leurocyclus tuberculosus	5.37	2.04	4.28	33.97
	Libinia spinosa	1.79	0.74	1.73	4.43
Atelecyclidae	Peltarion spinosulum	3.28	1.11	2.74	12.65
Portunidae	Callinectes sapidus	1.79	1.02	0.75	3.18
	Ovalipes trimaculatus	0.30	0.09	0.12	0.06
	Coenophtalmus tridentatus	0.30	0.18	0.05	0.07
Xanthidae		0.30	0.18	0.03	0.06
Pinnotheridae	Pinnixa patagoniensis	0.30	0.09	<0.01	0.03
	Pinnixa brevipollex	0.60	0.18	0.02	0.12
Mysidacea		0.60	0.28	<0.01	0.17	<0.01
Amphipoda		0.60	0.28	<0.01	0.17	<0.01
Isopoda		1.50	0.46	0.05	0.76	<0.01
Serolidae	Serolis spp.	0.60	0.18	0.01	0.12
	Serolis marplatensis	0.30	0.09	0.01	0.03
	Serolis polaris	0.60	0.18	0.02	0.12
MOLLUSCA
Cephalopoda		2.98	1.02	1.75	0.12		8.27	0.07
Unidentified cephalopods		0.60	0.18	0.07	0.15
Octopodidae	Octopus tehuelchus	2.69	0.83	1.68	6.75
Gasteropoda		0.30	0.09	<0.01	0.03	<0.01
POLYCHAETA		0.89	0.28	0.02	0.27	<0.01
CEPHALOCHORDATA
Branchiostomidae	Branchiostoma platae	0.60	0.18	<0.01	0.27	<0.01	0.11	<0.01

Prey categories	Intercep	Coefficients	AIC	w
Shrimps	- 2.176 (0.327)	- 0. 002 (0.0006) TL - 0.375 (0.159) cold	1252.6	0.42
Crabs	- 0.195 (0.209)	- 0.499 (0.231) immature - 0.736 (0.233) south	593.6	0.35
Teleosts	- 2.947 (0.399)	0.003 (0.0007) TL + 0.924 (0.166) south	649.1	0.98

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Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

ABSTRACT