Spatial distribution of Illex argentinus in San Matias Gulf (Northern Patagonia, Argentina) in relation to environmental variables: A contribution to the new interpretation of the population structuring

Crespi-Abril, Augusto César; Morsán, Enrique; Williams, Gabriela Noemí; Gagliardini, Domingo A.

doi:10.1016/j.seares.2012.12.008

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…; Crespi‐Abril et al. ), there is little evidence of any genetic differentiation among these stocks (Carvalho et al. ; Adcock et al.…”

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confidence: 99%

“…The life cycle is approximately 1 year (Haimovici et al 1998;Bainy & Haimovici 2012;Lu & Chen 2012), although some southern Brazilian stocks live for only half a year (Schwarz & Perez 2010;Schwarz & Perez 2013). Even though several distinct stocks of I. argentinus have been defined according to size structures, spawning seasons, and spawning areas Haimovici et al 1998;Perez et al 2009;Crespi-Abril et al 2013), there is little evidence of any genetic differentiation among these stocks (Carvalho et al 1992;Adcock et al 1999).…”

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confidence: 99%

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Sex‐specific reproductive investment of summer spawners of Illex argentinus in the southwest Atlantic

Lin

Chen

et al. 2015

Invertebrate Biology

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Energy investment in reproduction and somatic growth was investigated for summer spawners of the Argentinean shortfin squid Illex argentinus in the southwest Atlantic Ocean. Sampled squids were examined for morphometry and intensity of feeding behavior associated with reproductive maturation. Residuals generated from length‐weight relationships were analyzed to determine patterns of energy allocation between somatic and reproductive growth. Both females and males showed similar rates of increase for eviscerated body mass and digestive gland mass relative to mantle length, but the rate of increase for total reproductive organ weight relative to mantle length in females was three times that of males. For females, condition of somatic tissues deteriorated until the mature stage, but somatic condition improved after the onset of maturity. In males, there was no correlation between somatic condition and phases of reproductive maturity. Reproductive investment decreased as sexual maturation progressed for both females and males, with the lowest investment occurring at the functionally mature stage. Residual analysis indicated that female reproductive development was at the expense of body muscle growth during the immature and maturing stages, but energy invested in reproduction after onset of maturity was probably met by food intake. However, in males both reproductive maturation and somatic growth proceeded concurrently so that energy allocated to reproduction was related to food intake throughout the process of maturation. For both males and females, there was little evidence of trade‐offs between the digestive gland and reproductive growth, as no significant correlation was found between dorsal mantle length‐digestive gland weight residuals. The role of the digestive gland as an energy reserve for gonadal growth should be reconsidered. Additionally, feeding intensity by both males and females decreased after the onset of sexual maturity, but feeding never stopped completely, even during spawning.

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“…; Crespi‐Abril et al. ), there is little evidence of any genetic differentiation among these stocks (Carvalho et al. ; Adcock et al.…”

mentioning

confidence: 99%