Krissa A Skogen

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Increased nitrogen (N) deposition, resulting from the combustion of fossil fuels, production of synthetic fertilizers, growth of N2-fixing crops and high-intensity agriculture, is one of the anthropogenic factors most likely to cause global biodiversity changes over the next century. This influence may be especially large in temperate zone forests, which(More)
PREMISE OF THE STUDY Microsatellite markers were developed in the annual herb, Oenothera harringtonii, to investigate patterns of genetic diversity, gene flow, and parentage within and among populations of this Colorado endemic. METHODS AND RESULTS Ten polymorphic loci were identified in O. harringtonii and tested in four populations sampled across the(More)
Identifying factors that shape the spatial distribution of genetic variation is crucial to understanding many population- and landscape-level processes. In this study, we explore fine-scale spatial genetic structure in Oenothera harringtonii (Onagraceae), an insect-pollinated, gravity-dispersed herb endemic to the grasslands of south-central and(More)
Floral trait evolution is frequently attributed to pollinator-mediated selection but herbivores can play a key role in shaping plant reproductive biology. Here we examine the role of florivores in driving floral trait evolution and pollinator shifts in a recently radiated clade of flowering plants, Oenothera sect. Calylophus We compare florivory by a(More)
UNLABELLED PREMISE OF THE STUDY Microsatellite primers were developed in the hemiparasitic perennial forb Castilleja sessiliflora to investigate patterns of gene flow and genetic diversity within and among populations. • METHODS AND RESULTS Twelve polymorphic loci were identified in C. sessiliflora and tested on three populations (32 individuals each)(More)
The occurrence and extent of multiple paternity is an important component of variation in plant mating dynamics. However, links between pollinator activity and multiple paternity are generally lacking, especially for plant species that attract functionally diverse floral visitors. In this study, we separated the influence of two functionally distinct floral(More)
PREMISE OF THE STUDY Land-use change is cited as a primary driver of global biodiversity loss, with myriad consequences for species, populations, and ecosystems. However, few studies have examined its impact on species interactions, particularly pollination. Furthermore, when the effects of land-use change on pollination have been studied, the focus has(More)
The genus Oenothera L. (Onagraceae) has diversifi ed across diverse habitats of North America with conservative shifts in pollinators (primarily between bees and hawkmoths; Raven, 1979 ) and more dramatic shifts in life history traits ( Evans et al., 2009 ). Oenothera sect. Calylophus (Spach) Torr. & A. Gray (Onagraceae) consists of seven recognized species(More)
PREMISE OF THE STUDY Eleven nuclear and four plastid microsatellite markers were screened for two gypsum endemic species, Oenothera gayleana and O. hartwegii subsp. filifolia, and tested for cross-amplification in the remaining 11 taxa within Oenothera sect. Calylophus (Onagraceae). METHODS AND RESULTS Microsatellite markers were tested in two to three(More)
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