{"id":{"repo_id":"utc","oai_identifier":"oai:scholar.utc.edu:theses-2013"},"canonical_url":"https://search.dev.ndltd.org/etd/utc/oai:scholar.utc.edu:theses-2013","repository":{"repo_id":"utc","name":"University of Tennessee - Chattanooga","base_url":"https://scholar.utc.edu/do/oai/"},"display":{"title":"Increased phenotypic plasticity linked to broader geographic range size in sunflower (Helianthus) species","abstract":"Human activity worsens global biodiversity loss, particularly for vulnerable rare species. Plant species can respond to environmental changes via adaptation and/or acclimation or migration, yet limited genetic diversity and fitness in rare species can hinder these processes. Changes in light availability from human activities impact the growth and fitness of broadleaf species like sunflowers (Helianthus spp.). In a garden experiment, we compared the phenotypic plasticity of five Helianthus species representing different geographic ranges. Locally restricted H. longifolius and H. verticillatus showed less plasticity in growth and allocation traits than widespread H. angustifolius and H. maximiliani. Rare species with narrower ranges also displayed less population-level plasticity compared to common species. Geographically restricted rare species may struggle to acclimate to changes in light availability caused by human activities, which could increase extinction vulnerability. Conservation efforts should target limiting invasive and woody species to mitigate reduced light availability in their native habitats.","abstract_html":"Human activity worsens global biodiversity loss, particularly for vulnerable rare species. Plant species can respond to environmental changes via adaptation and/or acclimation or migration, yet limited genetic diversity and fitness in rare species can hinder these processes. Changes in light availability from human activities impact the growth and fitness of broadleaf species like sunflowers (Helianthus spp.). In a garden experiment, we compared the phenotypic plasticity of five Helianthus species representing different geographic ranges. Locally restricted H. longifolius and H. verticillatus showed less plasticity in growth and allocation traits than widespread H. angustifolius and H. maximiliani. Rare species with narrower ranges also displayed less population-level plasticity compared to common species. Geographically restricted rare species may struggle to acclimate to changes in light availability caused by human activities, which could increase extinction vulnerability. Conservation efforts should target limiting invasive and woody species to mitigate reduced light availability in their native habitats.","abstract_has_math":false,"creators":["Wiegand, Thomas"],"institution":"University of Tennessee at Chattanooga","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Boyd, Jennifer N.","Klug, Hope; Cruse-Sanders, Jennifer M.","College of Arts and Sciences"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-03-01T08:00:00Z","date_published":"2024-03-01T08:00:00Z","updated_at":"2026-07-24T05:47:13Z","subjects":["Sunflowers--Effect of light on","Phenotypic plasticity"],"languages":["English","eng"],"rights":[],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://scholar.utc.edu/theses/836","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Boyd, Jennifer N.","Klug, Hope; Cruse-Sanders, Jennifer M.","College of Arts and Sciences"]},{"key":"dc:creator","label":"Author","values":["Wiegand, Thomas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-12-01T08:00:00Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-03-01T08:00:00Z"]},{"key":"dc:publisher","label":"Institution","values":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"]},{"key":"dc:relation","label":"Dc Relation","values":["Masters Theses and Doctoral Dissertations"]},{"key":"dc:type","label":"Dc Type","values":["Masters theses","Text"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sunflowers--Effect of light on","Phenotypic plasticity"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholar.utc.edu/theses/836"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Dept. of Biological and Environmental Sciences","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."]},{"key":"dc:description.abstract","label":"Abstract","values":["Human activity worsens global biodiversity loss, particularly for vulnerable rare species. Plant species can respond to environmental changes via adaptation and/or acclimation or migration, yet limited genetic diversity and fitness in rare species can hinder these processes. Changes in light availability from human activities impact the growth and fitness of broadleaf species like sunflowers (Helianthus spp.). In a garden experiment, we compared the phenotypic plasticity of five Helianthus species representing different geographic ranges. Locally restricted H. longifolius and H. verticillatus showed less plasticity in growth and allocation traits than widespread H. angustifolius and H. maximiliani. Rare species with narrower ranges also displayed less population-level plasticity compared to common species. Geographically restricted rare species may struggle to acclimate to changes in light availability caused by human activities, which could increase extinction vulnerability. Conservation efforts should target limiting invasive and woody species to mitigate reduced light availability in their native habitats."]},{"key":"dc:title","label":"Title","values":["Increased phenotypic plasticity linked to broader geographic range size in sunflower (Helianthus) species"]}]}],"canonical_facts":{"dc:contributor":["Boyd, Jennifer N.","Klug, Hope; Cruse-Sanders, Jennifer M.","College of Arts and Sciences"],"dc:creator":["Wiegand, Thomas"],"dc:date":["2023-12-01T08:00:00Z"],"dc:date.available":["2024-03-01T08:00:00Z"],"dc:description":["Dept. of Biological and Environmental Sciences","M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science."],"dc:description.abstract":["Human activity worsens global biodiversity loss, particularly for vulnerable rare species. Plant species can respond to environmental changes via adaptation and/or acclimation or migration, yet limited genetic diversity and fitness in rare species can hinder these processes. Changes in light availability from human activities impact the growth and fitness of broadleaf species like sunflowers (Helianthus spp.). In a garden experiment, we compared the phenotypic plasticity of five Helianthus species representing different geographic ranges. Locally restricted H. longifolius and H. verticillatus showed less plasticity in growth and allocation traits than widespread H. angustifolius and H. maximiliani. Rare species with narrower ranges also displayed less population-level plasticity compared to common species. Geographically restricted rare species may struggle to acclimate to changes in light availability caused by human activities, which could increase extinction vulnerability. Conservation efforts should target limiting invasive and woody species to mitigate reduced light availability in their native habitats."],"dc:identifier":["https://scholar.utc.edu/theses/836"],"dc:language":["English","eng"],"dc:publisher":["University of Tennessee at Chattanooga","Chattanooga (Tenn.)"],"dc:relation":["Masters Theses and Doctoral Dissertations"],"dc:rights":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["Sunflowers--Effect of light on","Phenotypic plasticity"],"dc:title":["Increased phenotypic plasticity linked to broader geographic range size in sunflower (Helianthus) species"],"dc:type":["Masters theses","Text"]},"updated_at":"2026-07-24T05:47:13Z"}