Diet of the freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae) on Marajó Island (Pará, Brazil).
The stomach contents of 137 examples of Potamotrygon motoro caught in 3 locations (Muaná, Afuá and Lake Arari) on Marajó Island were analysed. The values of the Index of Relative Importance (IRI) and its respective percentage (%IRI) were calculated. The level of repletion 1 (1/4 full) was the most representative for both sexes, as well as for immature and mature specimens. Most of the food items found were well-digested. The food items identification indicated the presence of 15 orders, including insects, mollusks, crustaceans, annelids and fish. Differences in diet were observed among the locations studied when comparing %IRI, crustaceans being the most preferred in Afuá, fish in Lake Arari and mollusks in Muaná.
Laboratório de Ictiologia Estuarina, Departamento de Zoologia, Universidade Federal do Paraná, Curitiba, PR, Brazil. maupalms@gmail.com
M P
MP
Almeida
P M O
PM
Lins
P
P
Charvet-Almeida
R B
RB
Barthem
D000818:Animals; D001938:Brazil; D004032:Diet; D005260:Female; D005518:Food Preferences / Q000502:physiology*; D005618:Fresh Water; D005766:Gastrointestinal Contents; D008297:Male; D012860:Skates, Fish / Q000502:physiology*