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  • Canadian Science Publishing  (3)
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  • Canadian Science Publishing  (3)
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  • 1
    Online Resource
    Online Resource
    Experimental evaluation of ontogenetic diet transitions in summer flounder ( Paralichthys dentatus ), using stable isotopes as diet tracers
    Canadian Science Publishing ; 2004
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 61, No. 11 ( 2004-11-01), p. 2069-2084
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 61, No. 11 ( 2004-11-01), p. 2069-2084
    Abstract: We examined the rate of isotopic change of nitrogen (N) and carbon (C) and isotopic fractionation at two temperatures during several ontogenetic diet transitions in summer flounder (Paralichthys dentatus). We examined prefeeding larvae as they metabolize the maternal source of nutrition and evaluated three diet transitions in the early life stages of this species: (i) yolk dependency to first feeding on zooplankton, (ii) one zooplankton (rotifers) to another (Artemia), and (iii) zooplanktivory to piscivory. We used experimental results and simulations to contrast time- versus growth-based models for estimating parameters of isotopic change and fractionation. All rates of isotopic change were lowest for the transition between zooplanktivory and piscivory, most rapid for the transition from yolk dependency to first feeding, and generally lower at cooler temperatures. Estimates of fractionation were greater for N (2.83.8) than for C (0.230.91) but appeared to be unaffected by water temperature or fish life stage. Simulation results suggested that parameter estimates of isotopic change and fractionation may be compromised when growth rates are low unless sampling design is modified to address slow growth rates. We conclude that sampling strategy and the model used can influence the accuracy and precision of estimates of isotopic change and fractionation.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f04-156
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Size and Age at Metamorphosis in Marine Fishes: An Analysis of Laboratory-Reared Winter Flounder ( Pseudopleutonectes americanus ) with a Review of Variation in Other Species
    Canadian Science Publishing ; 1987
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 44, No. 11 ( 1987-11-01), p. 1936-1947
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 44, No. 11 ( 1987-11-01), p. 1936-1947
    Abstract: Offspring of adult winter flounder (Pseudopleuronectes americanus) collected from Conception Bay, Newfoundland, were reared from fertilization to metamorphosis. We tested two hypotheses: 1) length and age at metamorphosis are equally variable among individuals and (2) length and age at metamorphosis are not correlated. Length at metamorphosis was significantly less variable than age at metamorphosis when data from all laboratory populations were pooled and in 15 of 18 populations. Coefficients of variation for length and age at metamorphosis for the pooled data were 0.051 and 0.123, respectively. Length and age at metamorphosis were positively correlated when the data were pooled (r = 0.42, p  〈  0.001) and within 8 of 18 populations. Larvae that metamorphose late do so at larger sizes. When length and age at metamorphosis were converted to growth and developmental rates for the full larval period, significant positive correlations were evident between these rates for the pooled data (r = 0.68, p  〈  0.001) and within 16 of 18 populations. Larvae that grow slowly, therefore, remain as larvae longer. An examination of published values on size and age at metamorphosis in marine fishes revealed a pattern consistent with our findings both within and among populations and environments: (1) variation in length was less than variation in age at metamorphosis and (2) positive correlations between growth and developmental rates were evident through the larval period. Increased size at metamorphosis may ameliorate competitive effects and reduce the risk of predation in the period immediately following metamorphosis. Due to the considerable variation in the duration of the larval period (age at metamorphosis) the number of individuals that successfully metamorphose and subsequently enter the mature population could be significantly altered under differing environmental conditions.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f87-238
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1987
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Event Analysis Applied to Timing in Marine Fish Ontogeny
    Canadian Science Publishing ; 1989
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 46, No. 9 ( 1989-09-01), p. 1633-1641
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 46, No. 9 ( 1989-09-01), p. 1633-1641
    Abstract: We illustrate the utility of event analysis for characterizing timing in marine fish life histories, comparing event series among experimental groups, and predicting event timing in untested environments. Two examples using early life history traits are given, in example (1) we analyzed parental influence on metamorphosis timing in experimental laboratory populations of winter flounder (Pseudopleuronectes americanus). We fit a Weibull distribution to right-censored observations of age at metamorphosis and then estimated the fraction of individuals from each of two families that had become juveniles by a predetermined day. Offspring of one family were 1.25 times more likely than the second to enter the juvenile period under the applied time constraint. In example (2) we evaluated temperature effects on age at death of unfed capelin hatchlings (Mallotus villosus). Using an accelerated failure time model we predicted age at death at an untested temperature and, assuming a patchy distribution of prey, estimated the number of days available to a cohort to encounter a suitable food patch and still maintain the potential for generating an above average year-class. These examples demonstrate the utility of event analysis for more thorough use of observations on ontogenetic timing in experimental and natural populations.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f89-208
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1989
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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