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  • 2005-2009  (3)
  • Biodiversity Research  (3)
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  • 2005-2009  (3)
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  • Biodiversity Research  (3)
  • 1
    Online Resource
    Online Resource
    Comparative distribution and invasion risk of snakehead (Channidae) and Asian carp (Cyprinidae) species in North America
    Canadian Science Publishing ; 2007
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 64, No. 12 ( 2007-12-01), p. 1723-1735
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 64, No. 12 ( 2007-12-01), p. 1723-1735
    Abstract: As nonindigenous species are a major threat to global biodiversity, cost-effective management requires identification of areas at high risk of establishment. Here we predict suitable environments of 14 high-profile species of nonindigenous snakehead (Channidae) and Asian carp (Cyprinidae) species in North America based upon ecological niche modelling and compare the driving environmental variables for the two fish groups. Snakeheads distributions were correlated with thermal factors, whereas those of Asian carps were related mainly to precipitation. Predicted suitable ranges for these nonindigenous species can be divided into three main areas: Mexico and the southern United States (five species); Mexico and the United States up to ~35 °N (three species); and most of Mexico, continuous United States, and southern Canada (six species). For the province of Ontario, we combined the number and location of aquarium stores and live fish markets with predicted areas of suitable environments to identify areas at risk of introduction and establishment. We identified several watersheds draining into northwestern Lake Ontario as having the highest risk, highlighting the increased predictive value of this approach.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f07-130
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2007
    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
    Organic production of vegetables: State of the art and challenges
    Canadian Science Publishing ; 2007
    In:  Canadian Journal of Plant Science Vol. 87, No. 5 ( 2007-12-01), p. 1055-1066
    Details
    In: Canadian Journal of Plant Science, Canadian Science Publishing, Vol. 87, No. 5 ( 2007-12-01), p. 1055-1066
    Abstract: In light of the growing concern of Canadians about animal waste, environmental pollution from fertilizers, water quality and greenhouse gas effects, as well as their growing interest in organically grown foods (20% annual growth in North America), the development of sustainable organic production systems for vegetable crops is essential for consumer satisfaction and Canadian grower competitiveness. The target of this paper is to review recent research results on the importance of appropriate soil properties, fertilizers and irrigation management on soil activity, plant growth and environmental health as well as product quality in term of nutritional value and safety issue. Species and cultivar selection, the use of grafting and plant growth promoters will also be discussed. This review will identify new challenges that organic growers have to fulfill in the face of a global market and public awareness of health attributes of food, and then conclude by identifying several prospects for future research with emphasis on the Agriculture and Agri-Food Canada research program. Key words: Horticulture, organic farming, organic vegetable, research
    Type of Medium: Online Resource
    ISSN: 0008-4220 , 1918-1833
    URL: Article
    DOI: 10.4141/CJPS07160
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 2016989-9
    SSG: 12
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Model averaging to estimate rebuilding targets for overfished stocks
    Canadian Science Publishing ; 2005
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 62, No. 3 ( 2005-03-01), p. 544-562
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 62, No. 3 ( 2005-03-01), p. 544-562
    Abstract: Reducing overfishing and recovering overfished fish stocks is a challenging and important global problem. Rebuilding targets are essential ingredients for guiding overfished stocks to recovery. Having robust estimates of rebuilding targets is likely a necessary condition for effective long-term management of fishery resources. In this paper, we show how Bayesian model averaging can be applied to estimate rebuilding targets under alternative hypotheses about stockrecruitment dynamics. Using alternative hypotheses about stockrecruitment dynamics and environmental variation is important because using only a single hypothesis can lead to substantially different reference points and policy implications. The alternative hypotheses are augmented with prior information collected from meta-analyses of stockrecruitment data to construct a set of age-structured production models. We illustrate our approach using three overfished New England groundfish stocks. We fit alternative model likelihoods to observed data using Bayesian inference techniques. The Schwarz goodness-of-fit criterion was used to calculate model probabilities. Bayesian model averaging was used to estimate rebuilding targets that were robust to model selection uncertainty. Model-averaged estimates suggested that rebuilding targets for overfished stocks can be reasonably well determined if adequate prior information on stock productivity is available. Nonetheless, results had wide confidence intervals that reflected the underlying uncertainty in rebuilding targets.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f04-199
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2005
    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
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