Evaluating age in Octopus vulgaris: estimation, validation and seasonal differences
نویسندگان
چکیده
منابع مشابه
CIAC 10/GTP (AP) Age validation in common octopus Octopus vulgaris using stylet increment analysis
Daily periodicity of growth increments in stylets was validated in wild-caught Octopus vulgaris maintained under controlled conditions. It was corroborated by staining the stylets either with oxytetracycline or tetracycline, and comparing the number of rings produced with the number of days elapsed. In all, 19 animals (10 males and 9 females; 680–1470 g body weight) were injected with oxytetrac...
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The skin of Octopus vulgaris consumes considerable quantities of oxygen in vitro, averaging 4.55×10−5±1.80×10−5 ml mm−2 h−1 (mean ± S.D.), if a flow is maintained over the skin sample (N=32). The consumption is higher still in vivo, 11.36×10−5±2.73×10−5 ml mm−2 h−1 (N=8), suggesting an additional net import of oxygen through the skin when the blood system is intact. If a substantial boundary la...
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Untrained Octopus vulgaris (observers) were allowed to watch conditioned Octopus(demonstrators) perform the task of selecting one of two objects that were presented simultaneously and differed only in color. After being placed in isolation, the observers, in a similar test, consistently selected the same object as did the demonstrators. This learning by observation occurred irrespective of the ...
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The electrophoretic analysis of egg yolk proteins of the mollusc Octopus vulgaris by both SDSand nativePAGE, showed two different patterns that mirror the two main periods characterizing the reproductive cycle of the female of Octopus vulgaris: the non-vitellogenic period (October-February) and the vitellogenic period (March-July). Since different levels of progesterone also characterize these ...
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Two studies examined the hypothesis that the evaluation of developmental stability changes across adulthood. Results of Study 1 (N = 119) supported the expectation that older adults (M age = 65.29 years)—compared to younger (M age = 23.38 years) and middle-aged adults (M age = 38.68 years)— evaluate developmental stability more positively and losses less negatively across all life domains inclu...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 2011
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps09399