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35 results for “Picea; Picea sitchensis”
Picea sitchensis (Bong.) Carrière (BR0000025051643)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Picea sitchensis (Pinaceae) - leaf - showing orientation on twig
Image of Picea sitchensis (Pinaceae) - leaf - showing orientation on twig
Picea sitchensis (Pinaceae) - leaf - entire needle
Image of Picea sitchensis (Pinaceae) - leaf - entire needle
Picea sitchensis (Pinaceae) - bark - of a large tree
Image of Picea sitchensis (Pinaceae) - bark - of a large tree
Picea sitchensis (Pinaceae) - cone - female - mature open
Image of Picea sitchensis (Pinaceae) - cone - female - mature open
Picea sitchensis (Pinaceae) - twig - after fallen needles
Image of Picea sitchensis (Pinaceae) - twig - after fallen needles
Picea sitchensis (Pinaceae) - twig - showing attachment of needles
Image of Picea sitchensis (Pinaceae) - twig - showing attachment of needles
Picea sitchensis (Pinaceae) - bark - of a large tree
Image of Picea sitchensis (Pinaceae) - bark - of a large tree
Picea sitchensis (Pinaceae) - whole tree - general
Image of Picea sitchensis (Pinaceae) - whole tree - general
Picea sitchensis (Pinaceae) - whole tree - view up trunk
Image of Picea sitchensis (Pinaceae) - whole tree - view up trunk
Picea sitchensis (Pinaceae) - bark - of a large tree
Image of Picea sitchensis (Pinaceae) - bark - of a large tree
Picea sitchensis (Pinaceae) - cone - female - mature open
Image of Picea sitchensis (Pinaceae) - cone - female - mature open
Picea sitchensis (Pinaceae) - whole tree - view up trunk
Image of Picea sitchensis (Pinaceae) - whole tree - view up trunk
Picea sitchensis (Pinaceae) - whole tree - view up trunk
Image of Picea sitchensis (Pinaceae) - whole tree - view up trunk
Picea sitchensis (Pinaceae) - whole tree - general
Image of Picea sitchensis (Pinaceae) - whole tree - general
Picea sitchensis (Pinaceae) - bark - of a large tree
Image of Picea sitchensis (Pinaceae) - bark - of a large tree
Picea sitchensis (Pinaceae) - whole tree - view up trunk
Image of Picea sitchensis (Pinaceae) - whole tree - view up trunk
Cascade Head Experimental Forest site, station Cascade Head Experimental Forest HSGY Study Plots, study of diameter at breast height of Picea sitchensis (sitka spruce) in units of centimeter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Cascade Head Experimental Forest (CHE) contains diameter at breast height of Picea sitchensis (sitka spruce) measurements in centimeter units and were aggregated to a yearly timescale.
Data from: Genomic and phenotypic architecture of a spruce hybrid zone (Picea sitchensis x P. glauca)
Interspecific hybridization may enhance the capacity of populations to adapt to changing environments, and has practical implications for reforestation. We use genomewide estimates of admixture and phenotypic traits for trees in a common garden to examine the extent and direction of gene flow across a Picea hybrid zone, testing assumptions of the bounded hybrid superiority and tension zone models of hybrid zone maintenance. Seeds were collected from the ecological transition zone spanning from maritime to continental climates across the Picea sitchensis-P. glauca contact zone, and 721 trees were planted in a common garden experiment within the hybrid zone. Individuals were genotyped using a panel of 384 candidate-gene single nucleotide polymorphisms (SNPs) putatively associated with adaptive traits in Picea, and phenotyped at age ten for height and autumn cold hardiness. Low interspecific heterozygosity in hybrids indicated intrinsic reproductive barriers were too weak to prevent widespread recombination, although introgression appeared asymmetric with P. sitchensis dominating the zone. While marker-based hybrid index was strongly correlated with climate and geography, phenotypic traits exhibited weak or no significant clines. Our results indicated that exogenous selection appeared to play a strong role in the distribution and structure of this hybrid zone, indicative of an environmentally determined bounded hybrid superiority model of hybrid zone maintenance, although endogenous mechanisms could not be ruled out. This study provides insight into the mechanisms underlying adaptation across ecologically transitional hybrid zones that will ultimately provide an additional tool in managing these economically important tree species.
Data from: Genomic and phenotypic architecture of a spruce hybrid zone (Picea sitchensis x P. glauca)
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