Browsing by Author "Savage, Jessica A"
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Item Damage measurements and reproductive outcomes following phenologic delay and floral freezing of a population of Prunus pumila plants(2024-06-06) Lake Diver, Danielle A; Savage, Jessica A; jsavage@d.umn.edu; Savage, Jessica; Savage research teamThere are advantages flowering early in the spring, which include greater pollinator fidelity and longer fruit maturation time. But plant phenology has advanced in recent years making many plants vulnerable to freezing damage from late frosts. To determine the costs and benefits of flowering early in the spring, we exposed Prunus pumila plants to two freezing treatments and a delayed flowering treatment in subsequent years. Data were collected on ovary swelling, fruit production and pollinator visitation on hand-and open-pollinated plants in all treatments. We also measured tissue damage after freeze events. Our results suggest that flowering time and temperature affect reproductive success, with fewer fruits produced after hard freezes. The same was not true for light freezes, which had minimal impact on reproduction. Freezing damage to plants after a hard freeze did affect the number of Dipteran pollinators but not the overall pollinator visitation rate. Despite the clear impact of freezing temperatures on plant reproduction, there were also advantages for flowering early as reproductive output decreased during with delayed flowering. Our findings suggest that Prunus pumila will retain the ability to attract pollinators and produce viable seeds if exposed to false spring conditions that involve a light freeze, but hard freezes may reduce yield by an order of magnitude. Although the advantages to flowering early may outweigh the risk of freezing damage under current conditions, it is possible that flower viability may be constrained under continued climate warming.Item Data for Leaf out time correlates with wood anatomy across large geographic scales and within local communities.(2022-01-31) Savage, Jessica A; McMann, Natalie; Park, Daniel; Rothendler, Matthew; Mosher, Kennedy; jsavage@d.umn.edu; Savage, Jessica A; Savage research teamThese data are for a project investigating a potential correlation between leaf out time and wood anatomy across woody species. Wood anatomy and phenology data was collected for 220 plants from three different common gardens.Item Floral and leaf gas exchange and stem hydraulic conductance data observed from 2017 to 2018 on woody plants growing in Minnesota(2021-09-21) McMann, Natalie; Peichel, Alexander; Savage, Jessica A; mcman110@d.umn.edu; McMann, Natalie; Savage research teamThese data were collected for a project examining floral water loss and floral hydration in woody plants that flower before they produce leaves. Gas exchange and stem hydraulic conductance were measured on at least six individuals of five woody species. These data were used to compare floral and leaf water loss and to evaluate whether floral water loss was limited by stem hydraulic conductance.Item Floral gas exchange data observed from cut and intact inflorescences and during a heating experiment in 2018 on woody plants growing in Duluth, MN(2021-09-21) McMann, Natalie; Peichel, Alexander; Savage, Jessica A; mcman110@d.umn.edu; McMann, Natalie; Savage research teamThese data were collected for a project examining floral water loss and floral hydration in woody plants that flower before they produce leaves. Gas exchange was measured from inflorescences during two experiments: a) the comparison of cut inflorescences to inflorescences still on the plant (intact) and b) the observation of inflorescence response to increased heat.Item Maximum carbon assimilation model for understory wood plants growing at Bagley Nature Area in Duluth, MN(2020-05-26) O'Connell, Erin M; Savage, Jessica A; oconn877@d.umn.edu; O'Connell, Erin M; Savage research teamThese data were collected and analyzed for a project comparing the leaf phenology, carbon gain, growth, and freezing susceptibility of invasive and native species. Maximum seasonal carbon assimilation was modeled for six plants per eight species growing in a 50-year-old mixed forest. The model is based on understory light availability on sunny days, carbon dioxide assimilation rates, and leaf area adjusted in the spring for expanding leaves and in the fall for senescing leaves.Item Plant phenology and floral anatomy data observed from 2017 to 2020 on woody plants growing in Minnesota(2021-09-21) McMann, Natalie; Peichel, Alexander; Savage, Jessica A; mcman110@d.umn.edu; McMann, Natalie; Savage research teamThese data were collected for a project examining floral water loss and floral hydration in woody plants that flower before producing leaves. Floral phenology, bud mass, and surface area data was collected from at least 6 individuals of five species. Phenology and mass data were used to determine water uptake throughout bud development. Surface area data was used to standardize gas exchange measurements in a related dataset.Item Plant phenology, growth, freezing damage, and carbon gain data observed from 2017 to 2018 on wood plants growing at Bagley Nature Area in Duluth, MN(2020-05-26) O'Connell, Erin M; Savage, Jessica A; oconn877@d.umn.edu; O'Connell, Erin M; Savage research teamThese data were collected for a project comparing the leaf phenology, carbon gain, growth, and freezing susceptibility of four invasive and four native species. Leaf phenology and stem growth were observed for ten individuals per understory wood shrubs species. Freezing damage was experimentally assessed for each species and minimum temperatures in the species' native and exotic ranges were determined. Carbon gain was modeled for six individuals per species based on photosynthetic light response curves, leaf phenology, and understory light.Item Understory light environment measured in 2017 and 2018 at Bagley Nature Area in Duluth, MN(2020-05-26) O'Connell, Erin M; Savage, Jessica A; oconn877@d.umn.edu; O'Connell, Erin M; Savage research teamThese data were collected for a project comparing the leaf phenology, carbon gain, growth, and freezing susceptibility of invasive and native species. Understory light availability was measured above 80 understory wood shrubs using hemispherical photos, lux sensors, and photosynthetically active radiation (PAR) sensors. Light data was used to compare overstory and understory leaf phenology, and to quantify light available for carbon gain in the understory.Item The Untold Story of Plant Carbon Transport: How Physiology Mediates Plant-Environment Relationships (2015-01-22)(2015) Savage, Jessica A; University of Minnesota Duluth. Department of BiologyBecause of their immobile habit, plants have an intimate relationship with their environment and can experience strong selection for physiological strategies that allow them to survive and reproduce under specific environmental conditions. This is exemplified by the tight relationship that often exists between plant physiology and plant’s native distributions. Willows are no exception, and their distributions in Minnesota are tied to their drought tolerance and recruitment strategies. Meanwhile, on a continental scale, their distributions appear to be limited by their phenology. In these and other native systems, a key factor in determining species distributions is whether or not there are costs associated with certain physiological strategies, which can lead to trade-offs that prevent species from being successful in all habitats. Despite the fact that many well-studied trade-offs are tied to changes in resource allocation, there has been limited work examining how carbon transport might play a role in mediating plant-environment interactions. To address this gap in knowledge, my current research is focused on understanding how vascular movement of carbon in the phloem influences carbon allocation, phenology and stress tolerance. In the end, my goal is to understand the ecological implications of phloem physiology and the role of vascular anatomy in shaping how plants interact with their environment.