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6 results for “Shrub-steppe”
Data from: Diversity among rare and common congeneric plant species from the Garry oak and Okanagan shrub-steppe ecosystems in British Columbia: implications for conservation
<p>Using universal non-coding chloroplast DNA markers (cpDNA), we investigated genetic diversity and genetic structure in four rare and common plant species pairs inhabiting threatened ecosystems (Garry Oak and Okanagan shrub-steppe) in British Columbia. <span>The species found in the Garry oak ecosystem are:</span><span> </span><em>Sanicula bipinnatifida </em><span>(purple sanicle; Apiaceae; rare),</span><span> </span><em>Sanicula crassicaulis </em><span>(Pacific sanicle; Apiaceae; common), and</span><span> </span><em>Balsamorhiza deltoidea </em><span>(deltoid balsamroot; Asteraceae; rare). The species found in the Okanagan shrub-steppe ecosystem are:</span><span> </span><em>Balsamorhiza sagittata </em><span>(arrowleaf balsamroot; Asteraceae; common),</span><span> </span><em>Orthocarpus barbatus </em><span>(Grand Coulee owl-clover; Orobanchaceae; rare),</span><span> </span><em><u>Orthocarpus </u>luteus </em><span>(yellow owl-clover; Orobanchaceae; common),</span><span> </span><em>Phacelia ramosissima </em><span>(branching phacelia; Hydrophyllaceae; rare), and</span><span> </span><em>Phacelia linearis </em><span>(thread-leaved phacelia; Hydrophyllaceae; common). </span>Eight cpDNA regions were sequenced for each study species. Sequences were aligned and concatenated within each species, and single nucleotide polymorphisms (SNPs) were used to analyze patterns of regional genetic diversity and phylogeographic structure within genera and species. Results include: total gene diversity (Ht), nucleotide diversity (π), number of private alleles, haplotype networks, isolation by distance, and analysis of molecular variance. </p> <p> </p>
Data from: Diversity among rare and common congeneric plant species from the Garry oak and Okanagan shrub-steppe ecosystems in British Columbia: implications for conservation
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Data from: To burn or not to burn: comparing re-introducing fire with cutting an encroaching conifer for conservation of an imperiled shrub-steppe
Woody vegetation has increased on rangelands worldwide for the past 100-200 years, often because of reduced fire frequency. However, there is a general aversion to re-introducing fire and therefore, fire-surrogates are often used in its place to reverse woody plant encroachment. Determining the conservation effectiveness of re-introducing fire compared to fire-surrogates over different time scales is needed to improve conservation efforts. We evaluated the conservation effectiveness of re-introducing fire with a fire-surrogate (cutting) applied over the last ~30 years to control juniper (Juniperus occidentalis Hook.) encroachment on 77 sagebrush-steppe sites. Critical to conservation of this imperiled ecosystem is to limit juniper, not encourage exotic annual grasses, and promote sagebrush dominance of the overstory. Re-introducing fire was more effective than cutting at reducing juniper abundance and extending the period of time that juniper was not dominating the plant community. Sagebrush was reduced more with burning than cutting. Sagebrush, however, was predicted to be a substantial component of the overstory longer in burned than cut areas because of more effective juniper control. Variation in exotic annual grass cover was explained by environmental variables and perennial grass abundance, but not treatment, with annual grasses being problematic on hotter and drier sites with less perennial grass. This suggests that ecological memory varies along an environmental gradient. Re-introducing fire was more effective than cutting at conserving sagebrush-steppe encroached by juniper over extended time-frames; however, cutting was more effective for short-term conservation. This suggests fire and fire-surrogates both have critical roles in conservation of imperiled ecosystems.
Plant and pollinator interactions from British Columbia from Oak Savannah, Shrub-Steppe, and restored hedgerows
<p>This dataset contains the data analyzed in "Guzman, L.M., Chamberlain, S. and Elle, E. (2021) Network robustness and structure depends on the phenological characteristics of plants and pollinators. Ecology and Evolution"</p> <p>The data comprises plant-pollinator interactions collected in three ecosystems (Oak Savannah, Shrub-Steppe and restored hedgerows) from British Columbia. <b>These</b> three vegetation types comprised three different studies. The average distance between sites within studies was 19km, 18km and 29km for the oak savannah, shrub-steppe and hedgerows respectively. For simplicity we use "pollinator" throughout this paper to refer to insects and hummingbirds observed visiting flowers and contacting reproductive organs, although their effectiveness at transfer of pollen has not been assessed. The networks were comprised largely of bees, with wasps and hoverflies also common. Less common were butterflies and beetles. The plants were largely forbs with some shrubs; insect-pollinated trees were not sampled for largely logistical reasons of tree height but tended to be uncommon in these ecosystems.</p>
Data from: To burn or not to burn: comparing re-introducing fire with cutting an encroaching conifer for conservation of an imperiled shrub-steppe
Open the record for dataset details and reuse information.
Plant and pollinator interactions from British Columbia from Oak Savannah, Shrub-Steppe, and restored hedgerows
Open the record for dataset details and reuse information.
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OpenNeuro
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