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Feeding dynamics of Octopus mimus (Mollusca: Cephalopoda) in northern Chile waters

Feeding dynamics of Octopus mimus (Mollusca: Cephalopoda) in northern Chile waters,10.1007/BF00349228,Marine Biology,T. Cortez,B. G. Castro,A. Guerra

Feeding dynamics of Octopus mimus (Mollusca: Cephalopoda) in northern Chile waters   (Citations: 17)
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The natural feeding of 485 Octopus mimus (164 to 3088 g) was studied in relation to the species' life cycle and environmental seasonal variations off the north of Chile from autumn 1991 to summer 1992. Analysis of digestive-tract contents revealed that O. mimus preyed upon 25 different prey items belonging to five zoological groups (Teleostei, Mollusca, Crustacea, Echinodermata and Polychaeta). Cannibalism was only occasional. The results indicate that the diet and food intake of this species are significantly affected by sex and maturation. Senescent individuals ingest a small amount of food, and their diet is mainly based on small, not very motile prey. The food intake, expressed as body weight, of non-senescent individuals is higher in females than in males. Seasonal changes in sea-water temperature seem to be followed by adjustments in food intake. Like other Octopus species, O. mimus appears to be an opportunistic predator.
Journal: Marine Biology - MAR BIOL , vol. 123, no. 3, pp. 497-503, 1995
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    • ...However, in these periods high densities of bivalves, the main food of O. mimus (Cortez et al. 1995), were also found (Castilla and Camus 1992) which could keep the rate of cannibalism low...
    • ...Adult cannibalism on juveniles is documented for several species of squid (Amaratunga 1983; Dawe 1988; Lipinski and Linkowski 1988; Sauer and Lipinski 1991; Rocha et al. 1994; Rasero et al. 1996; Santos and Haimovici 1997; Dawe and Brodziak 1998; Mouat et al. 2001; Markaida and Sosa-Nishizaki 2003) and octopus (Re ´ and Go ´mez-Simes 1992; Cortez et al. 1995; Anderson 1999; Grubert et al. 1999; Iba ´nez and Chong 2008)...
    • ...filial cannibalism) during brood care (Re ´ and Go ´mez-Simes 1992; Cortez et al. 1995; Grubert et al. 1999; Iba ´nez and Chong 2008)...
    • ...Due to the monocyclic life-history of most cephalopods this type of cannibalism in cephalopods only occurs in case of brood-caring species of octopuses and polycyclic nautiluses (Arnold and Carlson 1986 ;R e´ and Go ´mez-Simes 1992; Cortez et al. 1995; Wood et al. 1998; Grubert et al. 1999; Iba ´nez and Chong 2008)...

    Christian M. Ibáñezet al. Cannibalism in cephalopods

    • ...Cortez et al. (1995) mention that the diet of O. mimus changes with season, which could be related with preys availability...

    Lorena P. Storeroet al. Growth and life span of the small octopus Octopus tehuelchus in San Ma...

    • ...The following indices were used (Hyslop1980; Cortez et al. 1995):...

    A. Quetglaset al. Biology of the upper-slope cephalopod Octopus salutii from the western...

    • ...Diets have also been linked to octopus size (Nigmatullin and Ostapenko 1976; Smale and Buchan 1981) and maturity stage (Cortez et al. 1995)...
    • ...Seasonal variation has been shown for O. mimus off Chile (Cortez et al. 1995), and has been suggested only for O. vulgaris off the east coast of South Africa (Smale and Buchan 1981)...

    C. D. Smith. Diet of Octopus vulgaris in False Bay, South Africa

    • ...In addition, nutritional utilization and the possible effect of sex are assessed, since female growth, unlike in males, seems to be more influenced by sexual maturation (Smale and Buchan 1981; Cortez et al. 1995a)...
    • ...Smale and Buchan (1981) noticed this higher growth rate and food intake in females, while Cortez et al. (1995a) observed that with Octopus mimus inmature males and females grew equally, but the growth was higher in mature females than in males...
    • ...Since in natural conditions octopuses select their prey according to environmental conditions, resources availability, season, time of the day, body weight, sex and maturation (Nigmatulin and Ostapenko 1976; Cortez et al. 1995a), a mixed diet would adjust better to the nutritional requirements in each growth phase and bring better results than a monodiet (Smale and Buchan 1981; Cagnetta and Sublimi...

    F. Aguado Giménezet al. Growth and food intake models in Octopus vulgaris Cuvier (1797): influ...

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