Coastal dunes are dynamic and unique ecosystems. On the Pacific coast, dunes are generally dominated by the beach grasses, Ammophila breviligulata and Ammophila arenaria, two invasive species introduced in the early 1900’s to stabilize sand and create foredunes that serve to protect people who live behind them. Recently, a novel...
Ecological communities are connected in space and time through the transfer of energy, materials, and organisms, together known as ecological subsidies. These ecological subsidies can have substantial effects on community structure, function, and services, especially when the connections are between communities with contrasting productivity. At the ocean-land interface, low productivity...
Non-native ecosystem engineers, which modify the structure and function of their ecosystems, are often a particularly concerning and costly group of invasive species. Such organisms may have substantial impacts on ecosystem services, or the benefits that humans derive from their ecosystems. Many factors play a role in the invasion success...
Biological invasions and climate change represent two preeminent threats to ecological communities and biodiversity, altering the distribution and abundance of species, disrupting existing species interactions and forming unprecedented ones, and creating novel ecological communities. Many of the most successful invasive species are also ecosystem engineers, species that physically modify the...
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Sally D. Hacker
Biological invasions and climate change represent two preeminent
The present study was a part of a larger research project
investigating the relationships between perceived clothing
deprivation and selected social-psychological, socio-economic,
and social participation variables among high school students.
The purpose of the present study was to investigate the
effects of clothing values and selected demographic
characteristics on perceived...
This study examined the relative contribution of parental warmth,
non-authoritarianism, and approval of sex-typed behavior to children's
sex role knowledge and preference. Subjects were 45 married
couples, and their 25 male and 20 female preschool children. Parental
attitudes toward child-rearing and sex role behavior were assessed
with the Parent Attitude...
Foundation species are important components of ecosystems because they provide habitat and ameliorate stressful conditions for residents. This thesis considers the role of surfgrasses (Phyllospadix spp.) as dynamic foundation species on the coast of Oregon in two studies. Chapter 2, which presents an observational survey of two Phyllospadix congeners, investigates...
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Sally D. Hacker
Foundation species are important components of ecosystems because they
Coastal dunes provide many functions and services including coastal protection, recreation, and habitat. Vegetation contributes to dune growth and stability, thereby increasing the coastal protection value of dunes. On the U.S. Pacific Northwest coast, the dominant dune grasses are the introduced non-native American beachgrass (Ammophila breviligulata) and the native American...
This study assessed the differences between
teachers' opinions and students' responses regarding the
influence of clothing on adolescents' decisions to
participate in social activities.
Survey methodology was used with the final samples
consisting of 336 students and 140 teachers who were drawn
from six high schools located in economically depressed...
International development projects aimed at alleviating poverty often fall short when it comes to capacity for operation and maintenance. As a case in point, today it is estimated one-third of all African wells have fallen into disrepair due to lack of effective management, corresponding to as many as 250,000 broken...