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31 results for “Grindelia”
Shortgrass Steppe site, station Treatment 4 (water and nitrogen addition) for ESA study, study of plant density of Grindelia squarrosa in units of numberPerMeterSquared 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 Shortgrass Steppe (SGS) contains plant density of Grindelia squarrosa measurements in numberPerMeterSquared units and were aggregated to a yearly timescale.
Data from: Genetic and ecotypic differentiation in a Californian plant polyploid complex (Grindelia, Asteraceae)
Studies of ecotypic differentiation in the California Floristic Province have contributed greatly to plant evolutionary biology since the pioneering work of Clausen, Keck, and Hiesey. The extent of gene flow and genetic differentiation across interfertile ecotypes that span major habitats in the California Floristic Province is understudied, however, and is important for understanding the prospects for local adaptation to evolve or persist in the face of potential gene flow across populations in different ecological settings. We used microsatellite data to examine local differentiation in one of these lineages, the Pacific Coast polyploid complex of the plant genus Grindelia (Asteraceae). We examined 439 individuals in 10 different populations. The plants grouped broadly into a coastal and an inland set of populations. The coastal group contained plants from salt marshes and coastal bluffs, as well as a population growing in a serpentine grassland close to the coast, while the inland group contained grassland plants. No evidence for hybridization was found at the single location where adjacent populations of the two groups were sampled. In addition to differentiation along ecotypic lines, there was also a strong signal of local differentiation, with the plants grouping strongly by population. The strength of local differentiation is consistent with the extensive morphological variation observed across populations and the history of taxonomic confusion in the group. The Pacific Clade of Grindelia and other young Californian plant groups warrant additional analysis of evolutionary divergence along the steep coast-to-inland climatic gradient, which has been associated with local adaptation and ecotype formation since the classic studies of Clausen, Keck, and Hiesey.
Grindelia lanceolata (Asteraceae) - whole plant - in flower - general view
Image of Grindelia lanceolata (Asteraceae) - whole plant - in flower - general view
Grindelia lanceolata (Asteraceae) - inflorescence - unspecified
Image of Grindelia lanceolata (Asteraceae) - inflorescence - unspecified
Grindelia lanceolata (Asteraceae) - leaf - on upper stem
Image of Grindelia lanceolata (Asteraceae) - leaf - on upper stem
Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Image of Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Image of Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Image of Grindelia lanceolata (Asteraceae) - inflorescence - whole - unspecified
Grindelia lanceolata (Asteraceae) - inflorescence - ventral view of flower + perianth
Image of Grindelia lanceolata (Asteraceae) - inflorescence - ventral view of flower + perianth
Grindelia lanceolata (Asteraceae) - stem - showing leaf bases
Image of Grindelia lanceolata (Asteraceae) - stem - showing leaf bases
Data from: Genetic and ecotypic differentiation in a Californian plant polyploid complex (Grindelia, Asteraceae)
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