Ava R Howard

Ava R Howard
Western Oregon University | WOU · Department of Biology

About

18
Publications
3,885
Reads
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474
Citations
Citations since 2016
6 Research Items
368 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
September 2009 - present
Western Oregon University
Position
  • Professor (Assistant)
September 2003 - June 2009
University of Georgia
Position
  • PhD Student

Publications

Publications (18)
Article
Urbanization transforms environments in ways that alter biological evolution. We examined whether urban environmental change drives parallel evolution by sampling 110,019 white clover plants from 6169 populations in 160 cities globally. Plants were assayed for a Mendelian antiherbivore defense that also affects tolerance to abiotic stressors. Urban...
Article
Urbanization transforms environments in ways that alter biological evolution. We examined whether urban environmental change drives parallel evolution by sampling 110,019 white clover plants from 6169 populations in 160 cities globally. Plants were assayed for a Mendelian antiherbivore defense that also affects tolerance to abiotic stressors. Urban...
Article
Full-text available
Species' differences in the stringency of stomatal control of plant water potential represent a continuum of iso- to anisohydric behavior. However, little is known about how quasi-steady state stomatal regulation of water potential may relate to dynamic behavior of stomata and photosynthetic gas exchange in species operating at different positions...
Data
Table S1. Leaf-level anatomical and physiological data for five species of the genus Rubus grown in a greenhouse common garden.
Article
Full-text available
Nighttime transpiration is a substantial portion of ecosystem water budgets, but few studies compare water use of closely related co-occurring species in a phylogenetic context. Nighttime transpiration can range up to 69% of daytime rates and vary between species, ecosystem, and functional type. We examined leaf-level daytime and nighttime gas exch...
Article
Full-text available
Quantitative literacy is essential to biological literacy (and is one of the core concepts in Vision and Change in Undergraduate Biology Education: A Call to Action; AAAS 2009). Building quantitative literacy is a challenging endeavor for biology instructors. Integrating mathematical skills into biological investigations can help build quantitative...
Article
Full-text available
Use of real specimens brings the study of biology to life. This activity brings easily acquired plant specimens into the classroom to tackle common alternative conceptions regarding life, size, complexity, the nature of science, and plants as multicellular organisms. The activity occurs after a discussion of the characteristics of life and engages...
Conference Paper
How do you get a group of passionate biology teachers to agree on how to teach an introductory non-majors course? You show them data! By conducting careful research into teaching and learning, we have united a team of five faculty into an instructional powerhouse. By turning our pedagogical ideas into hypotheses and gathering data we have been able...
Conference Paper
Background/Question/Methods Introductory science coursework often poses great challenges for undergraduate students. The emerging time management and study skills of students in introductory courses coupled with the large amount of information which students must learn, analyze and synthesize often lead to grades that are lower than instructors a...
Conference Paper
Background/Question/Methods Oregon white oak (OWO) is a dominant component of the savannah and woodland habitat that was once a large component of the landscape in western Oregon and Washington. Land use changes over the past century have removed much of this habitat and have threatened or endangered species associated with this ecosystem, includ...
Conference Paper
Full-text available
Background/Question/Methods Invasive plant species often have higher rates of resource use than natives and are major drivers of ecosystem change. Understanding invasive physiology and ecology is key to preserving Earth’s ecological systems. Few studies provide both phylogenetically and ecologically paired comparisons of natives and invasives and...
Article
Full-text available
Nighttime transpirational water loss from C(3) trees occurs without carbon gain and is both common and substantial. However, the magnitude of this water loss varies and a better understanding of the environmental factors driving this variation is needed. We investigated the response of nighttime conductance (g(night)) and transpiration (E(night)) t...
Article
C(3) plants dominate many landscapes and are critically important for ecosystem water cycling. At night, plant water losses can include transpiration (E(night)) from the canopy and hydraulic redistribution (HR) from roots. We tested whether E(night) limits the magnitude of HR in a greenhouse study using Artemisia tridentata, Helianthus anomalus and...
Article
Full-text available
We investigated the response of Helianthus species nighttime conductance (g(night)) and transpiration (E(night)) to soil nutrient and water limitations in nine greenhouse studies. The studies primarily used wild Helianthus annuus, but also included a commercial and early domesticate of H. annuus and three additional wild species (Helianthus petiola...

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