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  • 1
    Electronic Resource
    Electronic Resource
    Heterostyly in the Lamiaceae: The case ofSalvia brandegeei (2000)
    Springer
    Plant systematics and evolution 223 (2000), S. 211-219 
    Details
    ISSN: 1615-6110
    Keywords: Heterostyly ; distyly ; zygomorphic flowers ; self-compatibility ; protandry ; geitonogamy ; Lamiaceae ; rare plant species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heterostyly rarely occurs in families with strongly zygomorphic flowers. For this reason Darwin (1877) doubted whether heterostyly would occur in the Lamiaceae and recent reviews have not reported the floral polymorphism in this family. Here we describe distyly in a rare species ofSalvia restricted to bluffs and seaward canyons on Santa Rosa Island (Santa Barbara Co., California) and northwestern Baja California (Mexico).Salvia brandegeei is morphologically distylous with populations composed of equal frequencies of long-and short-styled morphs differing reciprocally in stigma and anther position. Controlled hand pollinations demonstrated no significant differences in the seed set of self, intramorph or intermorph pollinations. Unlike most heterostylous species investigated,S. brandegeei does not possess diallelic incompatibility or ancillary polymorphisms of pollen and stigmas. We propose that the evolution of distyly inS. brandegeei may have been associated with an ecological shift to a new environment in which protandry failed to prevent increased levels of geitonogamy. Heterostyly was then selected because it increased the proficiency of cross-pollination. The origin of distyly in self-compatibleS. brandegeei is consistent with Lloyd and Webb's theoretical model for the evolution of distyly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985280
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    LANDSAT survey of near-shore ice conditions along the Arctic coast of Alaska (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. Winter and spring near-shore ice conditions were analyzed for the Beaufort Sea 1973-77, and the Chukchi Sea 1973-76. LANDSAT imagery was utilized to map major ice features related to regional ice morphology. Significant features from individual LANDSAT image maps were combined to yield regional maps of major ice ridge systems for each year of study and maps of flaw lead systems for representative seasons during each year. These regional maps were, in turn, used to prepare seasonal ice morphology maps. These maps showed, in terms of a zonal analysis, regions of statistically uniform ice behavior. The behavioral characteristics of each zone were described in terms of coastal processes and bathymetric configuration.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E78-10136 , NASA-CR-157148
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Growth mechanisms of 'Katie's Floeberg' (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The growth mechanism of the grounded ice feature on Hanna's Shoal, located at approximately 162 deg W, 72 deg N in the Chukchi Sea, has been analyzed using Landsat I and II satellite imagery. The primary mechanism of growth was deduced to be the formation of large wedges of ice against the upstream edge of the feature. These wedges of piled ice form in three stages and may or may not become permanently affixed to the core of the feature. Remains of these growth patterns can sometimes be seen in the interior of the feature on the satellite imagery.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Arctic and Alpine Research; 10; 4, 19; 1978
    Format: text
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    NASA TECHNICAL REPORTS
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