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2016

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Articles 931 - 960 of 1105

Full-Text Articles in Ecology and Evolutionary Biology

Synthesis Of Satellite Microwave Observations For Monitoring Global Land-Atmosphere Co2 Exchange, Lucas Alan Jones Jan 2016

Synthesis Of Satellite Microwave Observations For Monitoring Global Land-Atmosphere Co2 Exchange, Lucas Alan Jones

Graduate Student Theses, Dissertations, & Professional Papers

This dissertation describes the estimation, error quantification, and incorporation of land surface information from microwave satellite remote sensing for modeling global ecosystem land-atmosphere net CO2 exchange. Retrieval algorithms were developed for estimating soil moisture, surface water, surface temperature, and vegetation phenology from microwave imagery timeseries. Soil moisture retrievals were merged with model-based soil moisture estimates and incorporated into a light-use efficiency model for vegetation productivity coupled to a soil decomposition model. Results, including state and uncertainty estimates, were evaluated with a global eddy covariance flux tower network and other independent global model- and remote-sensing based products.

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Genetic Structure And Connectivity Of The Endangered Giant Kangaroo Rat (Dipodomys Ingens) In A Heterogeneous Environment, Nathan Alexander Jan 2016

Genetic Structure And Connectivity Of The Endangered Giant Kangaroo Rat (Dipodomys Ingens) In A Heterogeneous Environment, Nathan Alexander

Cal Poly Humboldt theses and projects

Movement ecology and dispersal are important aspects of species’ life histories that can inform conservation and management. Dispersal is often cryptic and difficult to detect, but recent advances genetic technology and applications have provided new approaches to identifying and describing dispersal patterns. Giant kangaroo rats (Dipodomys ingens) are an endangered heteromyid that appear to persist in small subpopulations in a heterogeneous environment of their northern range, the Ciervo-Panoche Natural Area, California. Previous work suggested high levels of genetic diversity between populations with genetic distances not being correlated to geographic distances. Here, I identified landscape population structure through clustering …

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Vegetation Dynamics And Nitrogen Cycling Responses To Simulated Emerald Ash Borer Infestation In Fraxinus Nigra-Dominated Wetlands Of Upper Michigan, Usa, Joshua Davis Jan 2016

Vegetation Dynamics And Nitrogen Cycling Responses To Simulated Emerald Ash Borer Infestation In Fraxinus Nigra-Dominated Wetlands Of Upper Michigan, Usa, Joshua Davis

Dissertations, Master's Theses and Master's Reports

Throughout many North American forests, the invasive emerald ash borer (EAB, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae)) is a significant threat to biodiversity and ecosystem processes. The fate of Fraxinus nigra Marshall (black ash) is of particular concern, as it is frequently a dominant canopy species across much of its range. A multiyear manipulative study was conducted to investigate the potential impacts of EAB on vegetation dynamics and nitrogen (N) cycling in nine F. nigra-dominated wetlands of Upper Michigan, USA. The effects of early- and late-stage infestations were simulated by girdling (‘Girdle’) or felling (‘Ash-Cut’) all ash stems greater than …

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An Investigation Of Juvenile Alewife (Alosa Pseudoharengus) Habitat Use And Growth Using Natural Markers, Gregory Norman Labonte Ms Jan 2016

An Investigation Of Juvenile Alewife (Alosa Pseudoharengus) Habitat Use And Growth Using Natural Markers, Gregory Norman Labonte Ms

All Student Scholarship

This research attempts to connect patterns in growth and migration of an anadromous species. The goal of this research was to understand habitat movements and growth of juvenile alewives (Alosa pseudoharengus) in the Penobscot Estuary and Bay through the use of otolith microchemistry, otolith growth increments, and a laboratory stable isotope turnover study. Understanding the connection between growth and movement of juvenile alewives may lead to more accurate and sophisticated conservation and restoration methods for anadromous species.

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Key Biogeochemical Factors Affecting Soil Carbon Storage In Posidonia Meadows, Oscar Serrano, Aurora M. Ricart, Paul S. Lavery, Miguel-Angel Mateo, Ariane Arias-Ortiz, Pere Masque, Mohammad Rozaimi, Andy D. L. Steven, Carlos Duarte Jan 2016

Key Biogeochemical Factors Affecting Soil Carbon Storage In Posidonia Meadows, Oscar Serrano, Aurora M. Ricart, Paul S. Lavery, Miguel-Angel Mateo, Ariane Arias-Ortiz, Pere Masque, Mohammad Rozaimi, Andy D. L. Steven, Carlos Duarte

Research outputs 2014 to 2021

Biotic and abiotic factors influence the accumulation of organic carbon (Corg) in seagrass ecosystems.We surveyed Posidonia sinuosa meadows growing in different water depths to assess the variability in the sources, stocks and accumulation rates of Corg. We show that over the last 500 years, P. sinuosa meadows closer to the upper limit of distribution (at 2-4m depth) accumulated 3- to 4-fold higher Corg stocks (averaging 6.3 kgCorg m-2) at 3- to 4-fold higher rates (12.8 gCorg m-2 yr-1/ compared to meadows closer to the deep limits of distribution …

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Pollinator Sharing Between Mimulus Ringens And Coflowering Plant Species In Northeastern Ohio, Andrew M. Wuellner Jan 2016

Pollinator Sharing Between Mimulus Ringens And Coflowering Plant Species In Northeastern Ohio, Andrew M. Wuellner

Williams Honors College, Honors Research Projects

Competition between plants for pollinators can have serious impacts on plant reproduction; these impacts depend on many factors, such as plant abundance, plant diversity, floral abundance, pollinator abundance, and pollinator preference. The way pollinators move among and between coflowering species can tell us more about how these factors affect competition. In this study, we examine the movement patterns of flower visitors to Mimulus ringens and coflowering species in Northeastern Ohio through several types of observations. In addition, we measured the density and diversity of floral units with 20-30 meter transects across each study site. There were six total study sites, …

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Ecology Of Coyotes (Canis Latrans) In The Greater Detroit Area Of Southeastern Michigan, William B. Dodge Jan 2016

Ecology Of Coyotes (Canis Latrans) In The Greater Detroit Area Of Southeastern Michigan, William B. Dodge

Wayne State University Dissertations

Coyote distribution and habitat use, diet and foraging behavior and space use patterns were investigated in the greater Detroit area of southeastern Michigan. We found evidence of coyotes on 24 of 30 (80%) suburban and 7 of 11 (64%) urban plots. Overall fifty-eight percent of coyote evidence was found within edge habitats, with den sites and tracks the only types of evidence found strictly in interior habitats. Land cover around evidence points included more wooded land cover than expected in suburban areas, suggesting the importance of tree cover for coyote occupancy, and more open space and wooded land cover than …

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Effective Drug Treatment Induces Drug Resistance Through Rapid Genome Alteration-Mediated Cancer Evolution, Steven Horne Jan 2016

Effective Drug Treatment Induces Drug Resistance Through Rapid Genome Alteration-Mediated Cancer Evolution, Steven Horne

Wayne State University Dissertations

The central paradox associated with current cancer therapeutic strategies is initially effective treatment, which eliminates a high tumor cell count, consistently results in successful drug resistance. Mathematical and evolutionary modeling have previously suggested that therapeutic intervention could provide selective pressure for the expansion of resistant variants. Drug-related stress has been associated with genome chaos, a common phenomenon in cancer characterized as rapid, stochastic genomic fragmentation and reorganization. Since cancer represents an evolutionary process, analysis within the context of genome-mediated cancer evolution can shed light on this key problem of therapeutics. We propose that genomic change is a general response to …

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Preliminary Report: A Survey Of Aggressive Behaviors In The American Coot (Fulica Americana) At Ballona Wetlands, California, Victor D. Carmona-Galindo, Mariele Anne Courtois, Kiara Cerda Jan 2016

Preliminary Report: A Survey Of Aggressive Behaviors In The American Coot (Fulica Americana) At Ballona Wetlands, California, Victor D. Carmona-Galindo, Mariele Anne Courtois, Kiara Cerda

Biology Faculty Works

Understanding interspecific and intraspecific aggression is important for wildlife management and sustainability of populations. The objective of this study was to evaluate whether there is a difference in number of occurrences of interspecific aggression between American coots (Fulica americana) and mallard ducks (Anas platyrhynchos) and intraspecific aggression among American coots in the Ballona wetland habitat of Southern California. Trends in literature describe coots as highly aggressive toward other coots year-round and toward other bird species during the breeding season. Because we conducted observations outside the breeding season, we hypothesized that more instances of intraspecific aggression would …

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Anthropogenic Influence On Blackfin Sucker (Thoburnia Atripinnis) Distribution, In The Upper Barren River System, Kentucky And Tennessee, Christa Rose Hurak Jan 2016

Anthropogenic Influence On Blackfin Sucker (Thoburnia Atripinnis) Distribution, In The Upper Barren River System, Kentucky And Tennessee, Christa Rose Hurak

Online Theses and Dissertations

We evaluated the effects of land use and cover on endemic blackfin sucker (Thoburnia atripinnis) catch per unit effort and abundance within the Upper Barren River (UBR) system, a priority conservation area, in south-central Kentucky. Anthropogenic impacts have rendered T. atripinnis a “species of greatest conservation need” by the Kentucky Department of Fish and Wildlife Resources. This study focused on determining if land use surrounding blackfin sucker sampling sites and certain physicochemical parameters could be impacting their inhabitance at these sites. Data collection and ground truthing occurred between September 2015 and June 2016. ArcGIS was used to extract land use …

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Galápagos Sea Lion (Zalophus Wollekaeki) Play Behaviors On San Cristóbal Island, Ecuador, Mary Ann Kincer Jan 2016

Galápagos Sea Lion (Zalophus Wollekaeki) Play Behaviors On San Cristóbal Island, Ecuador, Mary Ann Kincer

Online Theses and Dissertations

My thesis concerns observations of play activities from videotapes of Galápagos sea lions on San Cristóbal Island from mid-summer of 2008. I begin with a discussion of ideas about play and types of play, elaborate the conceptual system of projects and routines in play, and provide a brief description of sea lion taxonomy and forms of play specific to Galápagos sea lions. Observing approximately 713 minutes of videotapes, I coded approximately 161.5 minutes of play projects and routines. Of the 713 minutes, 241 minutes were used in training, and 472 were coded independently by two coders for reliability. The two …

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Amphibian Community Composition And Disease Susceptibility In Ridge-Top Wetlands Of The Daniel Boone National Forest, Audrey Lauren Mctaggart Jan 2016

Amphibian Community Composition And Disease Susceptibility In Ridge-Top Wetlands Of The Daniel Boone National Forest, Audrey Lauren Mctaggart

Online Theses and Dissertations

Ephemeral wetlands are a natural feature of the ridge-top ecosystem in the Daniel Boone National Forest (DBNF) in eastern Kentucky, and support a diverse amphibian assemblage characterized by species with short larval periods. However, hundreds of hydrologically permanent ponds have been constructed along the ridge-top system in the last 50 years. The results of previous studies suggest that constructed ponds act as sinks for some historic ridge-top species because they provide habitat for amphibian predators with long larval periods or aquatic adult stages. My objectives were to determine (1) if natural wetlands differ from constructed wetlands in amphibian community composition, …

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Factors Influencing Pre-Fledging Mass Recession Of Nestling Tree Swallows, Katrina Deann Reeda Moeller Jan 2016

Factors Influencing Pre-Fledging Mass Recession Of Nestling Tree Swallows, Katrina Deann Reeda Moeller

Online Theses and Dissertations

Fledglings of some aerial insectivores experience pre-fledgling mass recession, possibly to achieve an optimum wing loading by the time of fledging. However, studies of aerial insectivores to date have been limited to two species of swifts (Apodidae), and additional studies of species of aerial insectivores are needed to determine if factors contributing to pre-fledging mass recession vary among species. Thus, my objective was to examine factors contributing to pre-fledging mass recession by nestling Tree Swallows (Tachycineta bicolor). My study was conducted during the 2015 breeding season at the Blue Grass Army Depot in Madison County, Kentucky. Nestling Tree Swallows (n …

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Biotic Assessment Of Two Central Kentucky Streams: Examining The Effects Of Wastewater Treatment And Anthropogenic Disturbance, Daniel John Ratterman Jan 2016

Biotic Assessment Of Two Central Kentucky Streams: Examining The Effects Of Wastewater Treatment And Anthropogenic Disturbance, Daniel John Ratterman

Online Theses and Dissertations

Globally, anthropogenic disturbance has altered many aquatic habitats, including lotic waters. Flowing, fresh water sustains life on Earth yet suffers the resulting waste products. Native, locally adapted ecosystems integrate or eliminate the byproducts of life. However an increase of human population, poor agricultural practices, accelerated overland runoff, a non-point source of pollution, and wastewater treatment plants (WTP), a point source of pollution, have all placed a strain on the world’s flowing, fresh, waters. The de-commissioning of two WTPs in the Kentucky River basin, and the commissioning of a new WTP in an adjacent watershed, provided an opportunity to examine the …

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A Vegetation-Based Index Of Biotic Integrity For Wetlands Of Kentucky, Noelle Newman Smith Jan 2016

A Vegetation-Based Index Of Biotic Integrity For Wetlands Of Kentucky, Noelle Newman Smith

Online Theses and Dissertations

Wetland ecosystems have experienced severe declines across the United States, prompting efforts to assess the status of remaining wetlands and regulate their development. The Clean Water Act and the policy of “No Net Loss” have resulted in a system of permitting and mitigation for impacts to wetlands. Professional judgments of wetland quality are inherent in regulatory decisions related to preservation and mitigation, but many states, and until recently including Kentucky, have no standard, quantifiable means of assessing wetlands to guide the decision process. A rapid assessment method has recently been developed for Kentucky, but there is no intensive assessment method …

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American Kestrels (Falco Sparverius) May Use Tail-Pumping To Maintain Balance, Joshua Suich Jan 2016

American Kestrels (Falco Sparverius) May Use Tail-Pumping To Maintain Balance, Joshua Suich

Online Theses and Dissertations

When perched, several species of small falcons, including American Kestrels (Falco sparverius), often pump their tails, but the possible function of this behavior is unknown. My objective was to use observations and experiments to examine the possible function(s) of tail-pumping by American Kestrels. Fieldwork was conducted from March 2015 to December 2015 at the Blue Grass Army Depot in Madison County, Kentucky. During observations of focal kestrels, I noted their behavior (e.g., landing on a perch, hunting, or consuming prey), including when and how often they pumped their tails (i.e., rapid movement of the tail down, then back up to …

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Movement Patterns Of The Kentucky Arrow Darter (Etheosotma Spilotum), Frecklebelly Darter (Percina Stictogaster), And Southern Redbelly Dace (Chrosomus Erythrogaster) In Elisha Creek And Gilbert's Big Creek, Red Bird River, Kentucky., Colin Arnold Jan 2016

Movement Patterns Of The Kentucky Arrow Darter (Etheosotma Spilotum), Frecklebelly Darter (Percina Stictogaster), And Southern Redbelly Dace (Chrosomus Erythrogaster) In Elisha Creek And Gilbert's Big Creek, Red Bird River, Kentucky., Colin Arnold

Online Theses and Dissertations

The movement patterns of small-bodied fishes in headwater streams are poorly understood. This study was designed to examine the movement patterns of the Kentucky Arrow Darter (Etheosotma spilotum), Frecklebelly Darter (Percine stictogaster), and Southern Redbelly Dace (Chrosomus erythrogaster) in two dynamic headwater streams, Elisha Creek and Gilbert's Big Creek, in the Red Bird River, Kentucky, utilizing Passive Integrated Transponders and an antennae detection system. Etheostoma spilotum is listed as a threatened species under the Endangered Species Act. Percina stictogaster is acknowledged as a species of greatest conservation need in Kentucky by the Kentucky Department of Fish and Wildlife Resources. Over …

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Wetland Condition Matters: Amphibian Richness And Abundance Change Across Wetland Condition Gradient, Kari Dupler Jan 2016

Wetland Condition Matters: Amphibian Richness And Abundance Change Across Wetland Condition Gradient, Kari Dupler

Online Theses and Dissertations

In the past century, Kentucky has lost more than 80% of its wetlands, and because state-wide monitoring was historically minimal, this number is likely underestimated. The Kentucky Division of Water, with Eastern Kentucky University and a technical working group, developed a rapid wetland assessment method (i.e. KY-WRAM) to assess wetland quality and aid in establishing mitigation levels and long-term monitoring. Validation of the KY-WRAM’s ability to reflect wetland condition requires comparison to intensive biotic assessments of amphibian, plant, and bird communities. Wetland and amphibian surveys for the 2014 and 2015 seasons were conducted at 42 riverine wetlands in the Kentucky …

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Using Plant-Soil Feedbacks To Predict Plant Biomass In Diverse Communities, Andrew Kulmatiski, Karen H. Beard, Josephine Grenzer, Leslie E. Forero, Justin Heavilin Jan 2016

Using Plant-Soil Feedbacks To Predict Plant Biomass In Diverse Communities, Andrew Kulmatiski, Karen H. Beard, Josephine Grenzer, Leslie E. Forero, Justin Heavilin

Wildland Resources Faculty Publications

It has become clear that plants can create soils that affect subsequent plant growth. However, because plant-soil feedbacks (PSFs) are typically measured in monoculture experiments, it remains unclear to what extent PSFs affect plant growth in communities. Here we used data from a factorial PSF experiment to predict the biomass of 12 species grown in 162 plant community combinations. Five different plant growth models were parameterized with either monoculture biomass data (Null) or with PSF data (PSF) and model predictions were compared to plant growth observed in communities. For each of the five models, PSF model predictions were closer to …

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Networks And Landscapes: A Framework For Setting Goals And Evaluating Performance At The Large Landscape Scale, R.P. Bixler, S. Johnson, K. Emerson, T. Nabatchi, M. Reuling, C. Curtin, Michele Romolini, J.M. Grove Jan 2016

Networks And Landscapes: A Framework For Setting Goals And Evaluating Performance At The Large Landscape Scale, R.P. Bixler, S. Johnson, K. Emerson, T. Nabatchi, M. Reuling, C. Curtin, Michele Romolini, J.M. Grove

Center for Urban Resilience Scholarship

The objective of large landscape conservation is to mitigate complex ecological problems through interventions at multiple and overlapping scales. Implementation requires coordination among a diverse network of individuals and organizations to integrate local‐scale conservation activities with broad‐scale goals. This requires an understanding of the governance options and how governance regimes achieve objectives or provide performance evaluation across both space and time. However, empirical assessments measuring network‐governance performance in large landscape conservation are limited. We describe a well‐established large landscape conservation network in North America, the Roundtable on the Crown of the Continent, to explore the application of a social–ecological performance …

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Graduate Students Navigating Social-Ecological Research: Insights From The Long-Term Ecological Research Network, S. Record, P. F. B. Ferguson, E. Benveniste, R. A. Graves, V. W. Pfeiffer, Michele Romolini, C. E. Yorke, B. Beardmore Jan 2016

Graduate Students Navigating Social-Ecological Research: Insights From The Long-Term Ecological Research Network, S. Record, P. F. B. Ferguson, E. Benveniste, R. A. Graves, V. W. Pfeiffer, Michele Romolini, C. E. Yorke, B. Beardmore

Center for Urban Resilience Scholarship

Interdisciplinary, collaborative research capable of capturing the feedbacks between biophysical and social systems can improve the capacity for sustainable environmental decision making. Networks of researchers provide unique opportunities to foster social-ecological inquiry. Although insights into interdisciplinary research have been discussed elsewhere, they rarely address the role of networks and often come from the perspectives of more senior scientists. We have provided graduate student perspectives on interdisciplinary degree paths from within the Long-Term Ecological Research (LTER) Network. Focusing on data from a survey of graduate students in the LTER Network and four self-identified successful graduate student research experiences, we examined the …

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Stewardship Mapping And Assessment Project: A Framework For Understanding Community-Based Environmental Stewardship, E. S. Svendsen, L. K. Campbell, D. R. Fisher, J. J. T. Connolly, M. L. Johnson, N. F. Sonti, D. H. Locke, L. M. Westphal, C. Leblanc Fisher, J. M. Grove, Michele Romolini, D. J. Blahna, K. L. Wolf Jan 2016

Stewardship Mapping And Assessment Project: A Framework For Understanding Community-Based Environmental Stewardship, E. S. Svendsen, L. K. Campbell, D. R. Fisher, J. J. T. Connolly, M. L. Johnson, N. F. Sonti, D. H. Locke, L. M. Westphal, C. Leblanc Fisher, J. M. Grove, Michele Romolini, D. J. Blahna, K. L. Wolf

Center for Urban Resilience Scholarship

The Stewardship Mapping and Assessment Project (STEW-MAP) is designed to answer who, where, why, and how environmental stewardship groups are caring for our urbanized landscapes. This report is intended to be a guide for those who wish to start STEW-MAP in their own city. It contains step-by-step directions for how to plan and implement a STEW-MAP project. STEW-MAP is both an empirical study of a city’s or region’s civic environmental stewardship resources and a publicly available online database to help support environmental stewardship broadly in these cities. The project adds a social layer of information to biophysical and urban geographic …

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Density And Diversity Of Bees In The Midwestern Agricultural Landscape: Influence Of Surrounding Agricultural Land Use And Local Plant Community Characteristics, Andrew J. Ridgway Jan 2016

Density And Diversity Of Bees In The Midwestern Agricultural Landscape: Influence Of Surrounding Agricultural Land Use And Local Plant Community Characteristics, Andrew J. Ridgway

Dissertations and Theses @ UNI

After over a century of large-scale agricultural development in the Midwestern corn-belt of the United States, many wild bee pollinator populations are in rapid decline or extirpated from their historic range. Large-bodied species, such as Bombus spp. are especially threatened, but are also valuable as efficient natural pollinators that are capable of effectively pollinating many economically important crops. Bees, therefore, have high conservation value, and pollination research has shifted focus from community inventory to population recovery efforts. These efforts include reducing the effects of habitat fragmentation and destruction using ecological restoration as well as integrating conservation strategies into agricultural land …

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Analyzing Winter Migration Fidelity And Movement Of The Wild Taimyr Reindeer Herd, Rangifer T. Tarandus, Emily T. Francis Jan 2016

Analyzing Winter Migration Fidelity And Movement Of The Wild Taimyr Reindeer Herd, Rangifer T. Tarandus, Emily T. Francis

Dissertations and Theses @ UNI

The Taimyr Reindeer Herd (TRH) is the largest wild reindeer population in the world, and is located in the northern central region of Arctic Russia. Previous detailed research on the spatiotemporal dynamics of this herd have been conducted involving aerial population censuses for two of the three seasons for reindeer: calving (Meerdink, 2012) and summer (Cooney, 2014). The first part of this study continues with the methods of the previous studies, analyzing the spatiotemporal fidelity of the TRH in the winter season. This was completed using geospatial analysis of digitized historical aerial census data of reindeer locations, and analyzing areas …

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Population Genetic Structure Of Necturus Maculosus In Central And Eastern Kentucky, Mason Owen Murphy Jan 2016

Population Genetic Structure Of Necturus Maculosus In Central And Eastern Kentucky, Mason Owen Murphy

Theses and Dissertations--Biology

Population structure is influenced by extrinsic factors, such as landscape architecture and dispersal barriers. Lotic network architecture is known to constrain ecological, demographic and evolutionary processes, including population genetic structure. I assessed the population structure of a widespread aquatic salamander, Necturus maculosus, across three river basins in central and eastern Kentucky. I examined the role of network architecture, anthropogenic barriers, and spatial scale on patterns of population structure. I also provided a review of N. maculosus capture methods and offer an improved trap design. I identified significant structuring between the combined Licking/Kinniconick basin and the Kentucky River basin, with …

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Territoriality And Inter-Pack Aggression In Gray Wolves: Shaping A Social Carnivore's Life History Rudyard Kipling's Law Of The Jungle Meets Yellowstone's Law Of The Mountains, Kira A. Cassidy, Douglas W. Smith, L. David Mech, Daniel R. Macnulty, Daniel R. Stahler, Matthew C. Metz Jan 2016

Territoriality And Inter-Pack Aggression In Gray Wolves: Shaping A Social Carnivore's Life History Rudyard Kipling's Law Of The Jungle Meets Yellowstone's Law Of The Mountains, Kira A. Cassidy, Douglas W. Smith, L. David Mech, Daniel R. Macnulty, Daniel R. Stahler, Matthew C. Metz

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

When Rudyard Kipling wrote The Jungle Book in 1894 and included the famous line "For the strength of the Wolf is the Pack, and the strength of the Pack is the Wolf," he would have had no idea that over a century later, scientific research would back up his poetic phrase. Recent studies in Yellowstone have found that both the individual wolf and the collective pack rely on each other and play important roles in territoriality. At a time when most fairy tales and fables were portraying wolves as demonic killers or, at best, slapstick gluttons, Kipling seemed to have …

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Wolf (Canis Lupus) Generation Time And Proportion Of Current Breeding Females By Age, L. David Mech, Shannon M. Barber-Meyer, John Erb Jan 2016

Wolf (Canis Lupus) Generation Time And Proportion Of Current Breeding Females By Age, L. David Mech, Shannon M. Barber-Meyer, John Erb

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

Information is sparse about aspects of female wolf (Canis lupus) breeding in the wild, including age of first reproduction, mean age of primiparity, generation time, and proportion of each age that breeds in any given year. We studied these subjects in 86 wolves (113 captures) in the Superior National Forest (SNF), Minnesota (MN), during 1972–2013 where wolves were legally protected for most of the period, and in 159 harvested wolves from throughout MN wolf range during 2012–2014. Breeding status of SNF wolves were assessed via nipple measurements, and wolves from throughout MN wolf range, by placental scars. In …

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The Evolution Of Aquatic Mammals Toward A Nearly Universal Large Size? Evidence From Phylogenetics And Fossils, William Gearty, Craig R. Mcclain, Jonathan Payne Jan 2016

The Evolution Of Aquatic Mammals Toward A Nearly Universal Large Size? Evidence From Phylogenetics And Fossils, William Gearty, Craig R. Mcclain, Jonathan Payne

School of Biological Sciences: Presentations

Most mammal species live on land, but the largest mammals live in the oceans. Aquatic and terrestrial habitats clearly impose differing selective pressures on body size. However, the quantitative study of body size evolution in mammals and other major animal clades typically focuses on either terrestrial or marine clades independently, thus failing to capture the dynamics of size evolution associated with the transition between land and water. Consequently, the extent to which the rate, magnitude, and outcome of size change associated with habitat transitions are shared among clades remains unknown, leaving open the question of whether the apparently common phenomenon …

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Amblypygids: Model Organisms For The Study Of Arthropod Navigation Mechanisms In Complex Environments?, Daniel D. Wiegmann, Eileen A. Hebets, Wulfila Gronenberg, Jacob M. Graving, Verner P. Bingman Jan 2016

Amblypygids: Model Organisms For The Study Of Arthropod Navigation Mechanisms In Complex Environments?, Daniel D. Wiegmann, Eileen A. Hebets, Wulfila Gronenberg, Jacob M. Graving, Verner P. Bingman

Eileen Hebets Publications

Navigation is an ideal behavioral model for the study of sensory system integration and the neural substrates associated with complex behavior. For this broader purpose, however, it may be profitable to develop new model systems that are both tractable and sufficiently complex to ensure that information derived from a single sensory modality and path integration are inadequate to locate a goal. Here, we discuss some recent discoveries related to navigation by amblypygids, nocturnal arachnids that inhabit the tropics and sub-tropics. Nocturnal displacement experiments under the cover of a tropical rainforest reveal that these animals possess navigational abilities that are reminiscent, …

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Mate Choice And Consequences For Consanguineous Mating In Drosophila Melanogaster, Emily S. Martin Jan 2016

Mate Choice And Consequences For Consanguineous Mating In Drosophila Melanogaster, Emily S. Martin

Theses and Dissertations (Comprehensive)

The ability to discriminate between prospective mates is potentially important not only for the avoidance of unsuccessful or incompatible matings, but also for the selection of higher “quality” mates. Inbreeding, reproduction between closely related individuals, has long enjoyed the attention of biologists, and has classically been associated with fitness consequences that are primarily negative, termed “inbreeding depression”. Indeed, the costs of mating with a relative are well documented across a wide variety of species. If individuals are capable of kin recognition, it is expected that species should evolve to avoid consanguineous matings. However, a number of recent models suggest circumstances …

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