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  • 1
    Publikationsdatum: 2016-11-15
    Beschreibung: California spotted owls (CSOs) ( Strix occidentalis occidentalis ) have received significant conservation attention beginning with the U.S. Forest Service interim management guidelines in 1992. The most commonly reported forest habitat feature for successful nesting habitat of CSO is canopy cover 〉 70%. Loss and degradation of Sierra Nevada CSO habitat, however, has been a growing concern, initially from commercial tree harvesting and, more recently, from wildfire. This study examined trends in wildfire impacts on potential nesting habitat of the CSO and discusses different management approaches that might lead to the conservation of CSO in fire-dependent forests. A total of 85,046 ha of CSO potential nesting habitat was burned by fire that resulted in ≥ 50% tree basal area (BA) mortality, reducing canopy cover on average to 〈 25%, during 2000–2014; this included 2.7%, 12.3%, and 7.6% of dense red fir ( Abies magnifica ), eastside pine, and westside forests, respectively. Based on regression predictions, within the next 75 yr, the cumulative amount of nesting habitat burned at ≥ 50% tree basal area mortality will exceed the total existing habitat. Four management strategies are discussed that could enhance the conservation of the CSO: (1) increased fire suppression, (2) strategically reducing fire hazards using mechanical treatments and/or prescribed fire, (3) increasing the amount of managed wildfire in CSO habitat, and (4) developing a landscape strategy that uses historical forest structure information to identify areas where high-canopy cover forests are more sustainable. Our estimates of how moderate- and high-severity fire may affect forests into the future poise a substantial threat to CSO persistence. More comprehensive forest restoration activities may be needed in CSO habitat to avoid significant losses of older forests.
    Digitale ISSN: 2150-8925
    Thema: Energietechnik
    Publiziert von Wiley im Namen von The Ecological Society of America (ESA).
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2024-01-25
    Beschreibung: Abstract
    Beschreibung: This dataset is a continuously growing collection of lead isotope reference data. Lead isotopes are an established method to reconstruct the raw material provenance of archaeological objects. They are typically applied to artefacts made of copper, lead, silver, and their alloys. However, also the raw ma- terial provenance of other materials such as glass, pigments and pottery was already investigated us- ing lead isotopes. To successfully reconstruct the origin of the raw material, lead isotope signatures from as many as possible suitable raw material occurrences must be known. In the past, large-scaled research projects were carried out to characterise ore deposits especially in the Mediterranean area and Western Eu- rope. However, many of these data are dispersed in the literature and were published in scientific articles or monographs. Consequently, each researcher or at least each research group had to build their own up-to-date database of reference data from the literature. To overcome these restrictions, to facilitate work with lead isotope reference data and particularly to make the data FAIR, i.e., finda- ble, accessible, interoperable and reusable (Wilkinson et al. 2016), these published data are compiled and transferred into a uniform layout. They are further enhanced with additional metadata to facili- tate their use in raw material provenance studies. Currently, the database is restricted to ores and minerals as these are the most relevant materials for provenance studies of ancient metals. Future updates will include hitherto uncovered regions but also additional data from countries already present. Slag and other metallurgical (by-) products from ancient sites in close vicinity to ore deposits generally are a genuine representation of the ores uti- lised in historic times. As such, they are highly relevant for provenance studies and an extension to these materials is therefore planned. GlobaLID is a representation of the collective work of researchers on Pb isotope studies. As such, the database is seen as a community engagement project that invites scientists all over the world to be- come active contributors of GlobaLID. The initiators of the database dedicate their effort to the con- tinuation and maintenance of the database but only the support of the whole community will allow a rapid and successful growth of GlobaLID.
    Schlagwort(e): raw material provenance ; chemical 〉 isotope ; chemical element 〉 element of group IV 〉 lead ; chemical element 〉 transition element 〉 copper ; chemical element 〉 transition element 〉 silver ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOCHEMISTRY 〉 GEOCHEMICAL PROPERTIES 〉 ISOTOPE RATIOS ; EARTH SCIENCE 〉 SOLID EARTH 〉 GEOCHEMISTRY 〉 GEOCHEMICAL PROPERTIES 〉 ISOTOPES ; EARTH SCIENCE 〉 SOLID EARTH 〉 ROCKS/MINERALS/CRYSTALS 〉 METALS ; EARTH SCIENCE 〉 SOLID EARTH 〉 ROCKS/MINERALS/CRYSTALS 〉 METALS 〉 METALS AGE DETERMINATIONS ; EARTH SCIENCE 〉 SOLID EARTH 〉 ROCKS/MINERALS/CRYSTALS 〉 METALS 〉 METALS VERTICAL/GEOGRAPHIC DISTRIBUTION ; In Situ/Laboratory Instruments 〉 Spectrometers/Radiometers 〉 ICP-MS ; In Situ/Laboratory Instruments 〉 Spectrometers/Radiometers 〉 MC-ICP-MS ; industrial process 〉 metal working 〉 metal smelting ; industry 〉 metallurgical industry 〉 non-ferrous metal industry ; lithosphere 〉 mineral 〉 metallic mineral 〉 non-ferrous metal ; resource utilisation ; resource utilisation 〉 extraction ; resource utilisation 〉 extraction 〉 mining
    Materialart: Dataset , Dataset
    Standort Signatur Erwartet Verfügbarkeit
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