Methods for analysis of natural diet in portunid crabs (Crustacea:Decapoda:Portunidae)

Study of the functional morphology of mouthparts of parasitic isopods of marine fishes

“…The foreguts were then separated from the surrounding tissue and placed on a drop of glycerin on a microscope slide. The food contents were estimated by the frequency of occurrence method and the volumetric methods as suggested by Williams [16] . Specimens were observed with a dissection and compound microscopes.…”

“…The diet of M. renardi, R. circularis and J. hilsae were mainly composed frequency 80%-90% and volumetric 70%-81% of mucus and similarly the stomach contents of N. phaeopleura and N. sundaica were dominated by body muscles frequency 75%-83% and volumetric 80%-82%, because they were attached only the outer surface of the body [16] . …”

Dinâmica da alimentação natural de Callinectes danae Smith (Decapoda, Portunidae) na Lagoa da Conceição, Florianôpolis, Santa Catarina, Brasil

“…O estudo da dieta natural de Crustacea Decapoda Brachyura tem sido muito di scutida mas, com exceção de WILLIAMS (1981), não existem trabalhos que abordem especificamente o assunto. ROPES (1968) e STEVENS et aI.…”

Natural Diet of Callinectes ornatus Ordway, 1863 (Decapoda, Portunidae) in the Itapocoroy Inlet, Penha, SC, Brazil

“…Sand was not considered a trophic category since it does not p rovide information about the nature of the diet (Williams, 1982). The trophic categories were analysed qualitatively and quantitatively using Hynes (1950) and Williams (1981) methods of frequency of occurrence (FO), of points (MP). For comparison and a better comprehension of the importance of each trophic category, the feeding index (IAi) was used as proposed by Kawakami & Vazzoler (1980) that combines both methods.…”

“…In addition to being a saprophagous species, it is also a predator that digs into the substrate in search of food and participates in the diet of other aquatic organisms (Haefner, 1990;Nonato et al, 1990). The available literature on the species covers the aspects of distribution, occurrence, reproduction, morphology (Gore, 1977;Norse, 1978;Paul, 1982;Branco & Lunardon-Branco, 1993 a, b;Melo, 1996) And Diet (Williams, 1981;Haefner, 1990;Nonato et al, 1990;Moncada & Gomes, 1980;Stoner & Buchanan, 1990). The purpose of this work was to study the natural diet of C. ornatus and the seasonal variations of the diet of the population of the Itapocoroy inlet in the municipality of Penha, SC, Brazil.…”