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  • 1
    Digitale Medien
    Digitale Medien
    Latitudinal variation in intertidal algal community structure: the influence of grazing and vegetative propagation (1981)
    Springer
    Oecologia 48 (1981), S. 297-307 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The hypothesis that sea urchin grazing and interactions with turf-forming red algae prevent large brown algae from forming an extensive canopy in the low intertidal zone of southern California was tested with field experiments at two study sites. Experimental removal of sea urchins resulted in rapid algal recruitment. Crustose coralline algae which typically dominate the substratum in areas with dense urchin populations were quickly overgrown by several species of short-lived green, brown and red algae. The removal of urchins also significantly increased the recruitment of two long-lived species of large brown algae (Egregia laevigata and Cystoseira osmundacea at one study site and E. laevigata and Halidrys dioica at the other). The experimental plots at both sites were eventually dominated by perennial red algae. A two-factorial experiment demonstrated that sea urchin grazing and preemption of space by red algae in areas where urchins are less abundant are responsible for the rarity of large brown algae in the low intertidal of southern California. The three dominant perennial red algae, Gigartina canaliculata, Laurencia pacifica and Gastroclonium coulteri, recruit seasonally from settled spores but can rapidly fill open space with vigorous vegetative growth throughout the year. These species encroach laterally into space created by the deaths of large brown algae or by other disturbances. Once extensive turfs of these red algae are established further invasion is inhibited. This interaction of algae which proliferate vegetatively with algae which recruit only from settled spores is analogous to those which occur between solitary and colonial marine invertebrates and between solitary and cloning terrestrial plants. It is suggested that a north-south gradient in the abundance of vegetatively propagating species, in grazing intensity and in the frequency of space-clearing disturbances, may account for latitudinal variation in intertidal algal community structure along the Pacific coast of North America.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00346486
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Dispersal of juveniles and variable recruitment in sessile marine species (1992)
    [s.l.] : Nature Publishing Group
    Nature 360 (1992), S. 579-580 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The prediction that failure of larvae to return to shore is a common cause of variable recruitment in coastal species follows from numerous observations (such as location of fish spawning grounds10, correlations between recruitment and shifts in wind direction9'10'12'14'15, behaviour of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/360579a0
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
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    Unbekannt
    Conservation markets for wildlife management with case studies from whaling (2014)
    Wiley-Blackwell
    Details
    Publikationsdatum: 2014-01-01
    Beschreibung: Although market-based incentives have helped resolve many environmental challenges, conservation markets still play a relatively minor role in wildlife management. Establishing property rights for environmental goods and allowing trade between resource extractors and resource conservationists may offer a path forward in conserving charismatic species like whales, wolves, turtles, and sharks. In this paper, we provide a conceptual model for implementing a conservation market for wildlife and evaluate how such a market could be applied to three case studies for whales (minke [Balaenoptera acutorostrata], bowhead [Balaena mysticetus], and gray [Eschrictius robustus]). We show that, if designed and operated properly, such a market could ensure persistence of imperiled populations, while simultaneously improving the welfare of resource harvesters. # doi:10.1890/12-1919.1
    Print ISSN: 1051-0761
    Digitale ISSN: 1939-5582
    Thema: Biologie
    Publiziert von Wiley-Blackwell im Namen von The Ecological Society of America (ESA).
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    facet.materialart.
    Unbekannt
    Facilitate, don't forbid, trade between conservationists and resource harvesters (2014)
    Wiley-Blackwell
    Details
    Publikationsdatum: 2014-01-01
    Beschreibung: doi:10.1890/13-1541.1
    Print ISSN: 1051-0761
    Digitale ISSN: 1939-5582
    Thema: Biologie
    Publiziert von Wiley-Blackwell im Namen von The Ecological Society of America (ESA).
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
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