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  • 1
    Online Resource
    Online Resource
    Factors influencing ultraviolet radiation dose to developing frogs in northern vernal pools
    Canadian Science Publishing ; 2013
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 70, No. 10 ( 2013-10), p. 1531-1541
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 70, No. 10 ( 2013-10), p. 1531-1541
    Abstract: Ultraviolet-B (UV-B) radiation exposure is one hypothesized mechanism explaining amphibian population declines and malformations, but it is rarely quantified in amphibian habitats. We measured spatial and temporal variations in northern vernal pools with UV-B attenuation through the water column, incident UV-B across pool surfaces and seasons, and cumulative UV-B dose. Atmospheric, local, and landscape effects were compared with variances across spatial and temporal scales, plus influence on exposure risk. Risk was evaluated using published reports on detrimental levels for amphibian survival and health, with life history and behavior of vernal pool breeding Rana sylvatica L. (wood frog). Pools were exposed to sufficiently high UV-B at or near the surface for developing amphibians to be at risk of reduced survival, altered growth, and malformation. Atmospheric conditions, vegetative cover, and water column properties significantly influenced UV-B levels, with oviposition and larval behavior controlling actual embryonic and larval exposure. UV-B risk to vernal pool species is greater than predicted in previous studies. Given changes in light regimes, climate change, and forest harvesting, amphibian UV-B exposure could reach levels of great concern.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2013-0137
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2013
    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
    Projecting cold-water fish habitat in lakes of the glacial lakes region under changing land use and climate regimes
    Canadian Science Publishing ; 2014
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 71, No. 9 ( 2014-09), p. 1334-1348
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 71, No. 9 ( 2014-09), p. 1334-1348
    Abstract: Cold-water habitat in lakes is projected to decrease under future climate scenarios, and existing trends suggest such declines are already impacting cold-water fish populations. Herein, we predict the effects of future climate and land use change on cold-water fish habitat in the glacial lakes of the upper midwestern US. Ecoregion-specific, regional regression models were developed to predict annual phosphorus loading rates to lakes based on land use and hydrology and coupled to a previously developed fish habitat model. Outputs from one land use change model and three global climate models were then used to project future cold-water habitat. Significant decreases in cold-water habitat quality were projected in all four ecoregions of the study region, with increases in air temperature generally having greater impacts on habitat than land use changes. Projected localized increases in urbanization and corn acreage were found to degrade cold-water habitat for a subset of lakes in all ecoregions. For cisco (Coregonus artedi), the most thermally tolerant of the four species considered, it was found that most of the highest quality (tier 1) refuge lakes will shift to lower quality (tier 2) lakes with adequate habitat, and about half of the tier 2 lakes will shift to tier 3 (non-refuge) lakes with marginal habitat.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2013-0535
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2014
    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
    Ecosystem classification and mapping of the Laurentian Great Lakes
    Canadian Science Publishing ; 2018
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 75, No. 10 ( 2018-10), p. 1693-1712
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 75, No. 10 ( 2018-10), p. 1693-1712
    Abstract: Owing to the enormity and complexity of the Laurentian Great Lakes, an ecosystem classification is needed to better understand, protect, and manage this largest freshwater ecosystem in the world. Using a combination of statistical analyses, published knowledge, and expert opinion, we identified key driving variables and their ecologically relevant thresholds and delineated and mapped aquatic systems for the entire Great Lakes. We identified and mapped 77 aquatic ecological units (AEUs) that depict unique combinations of depth, thermal regime, hydraulic, and landscape classifiers. Those 77 AEU types were distributed across 1997 polygons (patches) ranging from 1 to 〉 48 000 km 2 in area and were most diverse in the nearshore (35 types), followed by the coastal margin (26), and then the offshore (16). Our classification and mapping of ecological units captures gradients that characterize types of aquatic systems in the Great Lakes and provides a geospatial accounting framework for resource inventory, status and trend assessment; research for ecosystem questions; and management and policy-making.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/cjfas-2017-0242
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2018
    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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