Other Ecology and Evolutionary Biology Commons^™

An Examination Of The Phylogenetic Diversity Of Green Algae (Chlorophyceae) That Symbiose With Spotted Salamanders (Ambystoma Maculatum) In The Egg Stage., Crystal Xue

Honors Scholar Theses

In 1909, the species Oophila amblystomatis Lambert ex Wille was described for green algae that symbiose with salamanders in the egg stage (Wille). There are two hypotheses about the source of algae: 1) that algae enter from the surrounding water once the egg clutch is laid in a pond, and 2) that they are acquired from the maternal reproductive tract. We developed a third hypothesis developed to account for the salamander reproductive cycle. Male salamanders lay spermatophores, which are protein-filled capsules, on plant matter in and around ponds. Spermatophores are exposed to the environment before use by females in internal …

Diel Patterns Of Foraging Aggression And Antipredator Behavior In The Trashline Orb-Weaving Spider, Cyclosa Turbinata, James C. Watts

Electronic Theses and Dissertations

Few studies have rigorously assessed the adaptive value of diel rhythms in animals. We laid the groundwork for assessing the adaptive rhythm hypothesis by assaying diel rhythms of foraging and antipredator behavior in the orb-weaving spider Cyclosa turbinata. When confronted with a predator stimulus in experimental arenas, C. turbinata exhibited thanatosis behavior more frequently and for longer durations during the day. However, assays of antipredator response within webs revealed more complex diel patterns of avoidance behaviors and no pattern of avoidance behavior duration. Assays of prey capture behavior found that the likelihood of exhibiting prey capture behavior varied significantly …

Influence Of Wildfire Disturbance And Post-Fire Seeding On Vegetation And Insects In Sagebrush Habitats, Ashley T. Rohde

Boise State University Theses and Dissertations

Disturbance events alter community composition and structure because of differences in resistance and resilience of individual taxa, changes in habitat resulting in colonization by new taxa and alteration of biotic interaction patterns. Recent changes in disturbance types, frequencies and intensities caused by anthropogenic activities may further alter community composition and structure if these disturbances exceed the tolerances or adaptations of some taxa. In sagebrush steppe habitats of the western United States, wildfire is the current dominant disturbance type, burning millions of hectares annually. Further, up to 90% of sagebrush-steppe ecosystems are affected by anthropogenic influences such as invasive species. Post-fire …

Usda Forest Service Perspectives On Forest Management In A Changing Climate, Jamie E. Laatsch

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As climate change becomes more problematic for the Forest Service (FS) and other federal land management agencies in the U.S., it has become increasingly important to understand how their employees view climate change and related challenges. This study examined how FS employees in the Intermountain West view forest management in the face of climate change, what barriers and opportunities they see in terms of dealing with climate change, and how different levels of agency management view climate change-related issues differently. This study found that many FS employees believe climate change is an important issue; however, they have not done much …

Mafia Or Farmer? Coevolutionary Consequences Of Retaliation And Farming As Predator Strategies Upon Host Nests By Avian Brood Parasites, Mark E. Hauber

Publications and Research

Many host species of avian brood parasites have evolved to recognize and reject foreign eggs and chicks in the nest. Yet, other hosts accept and care for parasitic young, despite the fitness losses associated with raising non-kin. It has been suggested that nest predation upon host nests by brood parasites could select for coevolved acceptance by hosts, even when their cognitive and motor traits allow for the successful rejection of brood parasitism. Using a modeling approach, I analyzed the conditions that favor the evolution of two predatory strategies by parasites and the acceptance of parasitism in the presence of predatory …

Palynological Evidence For The Paleoenvironmental History Of The Miocene Llanos Basin, Eastern Colombia, Ingrid Carolina Romero Valero

Seton Hall University Dissertations and Theses (ETDs)

The distal Llanos foreland basin was influenced by subsidence events since the Cretaceous until the Pliocene. Although this area has been extensively explored and is considered a potential oil reservoir, few studies of its stratigraphy and depositional environments have been conducted. This basin exhibits a geological section of Miocene age and the core Saltarin-1A, analyzed in this study, is the first and most complete drilling coreof this section with 680 meters. It represents to Carbonera, Leon and Guayabo Formations. Based on palynological data, this work has as its main aims to review the biostratigraphy, to identify the depositional environments, including …

Sex Ratio Bias And Extinction Risk In An Isolated Population Of Tuatara (Sphenodon Punctatus), Kristine L. Grayson, Nicola J. Mitchell, Joanne M. Monks, Susan N. Keall, Joanna N. Wilson, Nicola J. Nelson

Biology Faculty Publications

Understanding the mechanisms underlying population declines is critical for preventing the extinction of endangered populations. Positive feedbacks can hasten the process of collapse and create an ‘extinction vortex,’ particularly in small, isolated populations. We provide a case study of a male-biased sex ratio creating the conditions for extinction in a natural population of tuatara (Sphenodon punctatus) on North Brother Island in the Cook Strait of New Zealand. We combine data from long term mark-recapture surveys, updated model estimates of hatchling sex ratio, and population viability modeling to measure the impacts of sex ratio skew. Results from the mark-recapture …

Ecological Processes Dominate The 13C Land Disequilibrium In A Rocky Mountain Subalpine Forest, D. R. Bowling, Ashley P. Ballantyne, J. B. Miller, S. P. Burns, T. J. Conway, O. Menzer, B. B. Stephens, B. H. Vaughn

Ecosystem and Conservation Sciences Faculty Publications

Fossil fuel combustion has increased atmospheric CO₂ by ≈ 115 µmol mol⁻¹ since 1750 and decreased its carbon isotope composition (δ¹³C) by 1.7–2‰ (the ¹³C Suess effect). Because carbon is stored in the terrestrial biosphere for decades and longer, the δ¹³C of CO₂released by terrestrial ecosystems is expected to differ from the δ¹³C of CO₂ assimilated by land plants during photosynthesis. This isotopic difference between land-atmosphere respiration (δ_R) and photosynthetic assimilation (δ_A) fluxes gives rise to the ¹³C land disequilibrium …

Exposure Of U.S. National Parks To Land Use And Climate Change 1900-2100, Andrew J. Hansen, Cory Davis, Jessica Haas, David M. Theobald, John E. Gross, William B. Monahan, Tom Olliff, Steven W. Running

Ecosystem and Conservation Sciences Faculty Publications

Many protected areas may not be adequately safeguarding biodiversity from human activities on surrounding lands and global change. The magnitude of such change agents and the sensitivity of ecosystems to these agents vary among protected areas. Thus, there is a need to assess vulnerability across networks of protected areas to determine those most at risk and to lay the basis for developing effective adaptation strategies. We conducted an assessment of exposure of U.S. National Parks to climate and land use change and consequences for vegetation communities. We first defined park protected-area centered ecosystems (PACEs) based on ecological principles. We then …

Fear Effects On Pheasant Reproductive Ecology And A Curriculum To Teach Wildlife Habitat Selection, Jessica Laskowski

School of Natural Resources: Dissertations, Theses, and Student Research

Predation risk is an important source of selection that shapes prey density, distribution and abundance. The immediate impacts of predator consumption on prey populations are widespread and well-studied, and a growing body of research demonstrates immediate impacts of predator-induced fear (independent of prey mortality) on prey behavior, physiology and life-history expression. However, predation risk is often seasonally variable and while it is clear that consumption effects often carry over to influence prey population demography for years after predators have disappeared, the temporal carry-over effects of fear on prey populations remain largely unexplored. We assessed effects of fall hunting activity by …

Review: The Rediscovery Of The Wild, Jillian M. Slater

Marian Library Faculty Publications

Copyright (c) 2014, Jillian Slater. This review is available for non-commercial, educational use, provided that the user identify the author and the publication listed as the place of first publication, along with the volume and the year of the work's publication.

Archaeological Data Provide Alternative Hypotheses On Pacific Herring (Clupea Pallasii) Distribution, Abundance, And Variability, Iain Mckechnie, Dana Lepofsky, Madonna L. Moss, Virginia L. Butler, Trevor J. Orchard, Gary Coupland, Frederick Foster, Megan Caldwell, Ken Lertzman

Anthropology Faculty Publications and Presentations

Over the last century, Pacific herring, a forage fish of tremendous cultural, economic, and ecological importance, has declined in abundance over much of its range. We synthesize archaeological fisheries data spanning the past 10,000 y from Puget Sound in Washington to southeast Alaska to extend the ecological baseline for herring and contextualize the dynamics of modern industrial fisheries. While modern herring populations can be erratic and exhibit catastrophic declines, the archaeological record indicates a pattern of consistent abundance, providing an example of long-term sustainability and resilience in a fishery known for its modern variability. The most parsimonious explanation for the …

"Over The River And Through The Woods": An Analysis Of Understory And Canopy Plant Diversity In Urban Riparian Forests, Carlisle R. Evans Peck

Urban Forest Project

As population growth explodes and urban areas expand, studying the ecology of urban areas has become increasingly important. Urban development has been shown to drastically alter native habitats and to severely degrade biodiversity. However, urban landscapes also hold the potential to harbor and support valuable biodiversity especially if managed correctly. We studied the understory herbaceous plant and overstory tree canopy diversity of eight forested ravines in the small cities of Rock Island and Moline IL surrounded by a range of urban development intensity. The goal of the project was to determine whether or not the composition of the plant communities …

Aspects Of The Trophic Ecology Of An Invertivorous Snake Community, Meagan Amanda Thomas

Masters Theses

Understanding the significance of trophic links has been of interest to ecologists for decades, likely because food web studies have the potential to reveal a considerable amount of information in the fields of ecosystem and community ecology. Despite the intrinsic benefits that come from elucidating food web structures, doing so is often problematic because of the complex and dynamic nature of ecological communities. The dietary ecology of small-bodied invertivorous snakes remains relatively understudied compared to other snake species. Many of these species are abundant throughout their range, making them ideal organisms for studying community-level questions. I employed a combination of …

Grassland Sustainability In Kentucky: Case Studies Quantifying The Effects Of Climate Change On Slug Herbivory In Pastures And Different Home Lawn Systems On Turf Greenhouse Gas Emissions, Daniel Adam Weber

Theses and Dissertations--Plant and Soil Sciences

Grasslands comprise the greatest biome by land area, are sensitive to environmental factors affected by climate change, and can impact future climate change through their ability to store and release greenhouse gasses (GHGs). I performed two studies: 1) evaluated the effects of increased temperature and precipitation on slug herbivory/abundance and pasture forage production; 2) quantified different homeowner lawn system effects on soil-to-atmosphere GHG emissions. Climate change will likely affect pasture forage production, with implications for slug herbivory and abundance. I found little evidence that slugs have or will have significant effects on pasture production or plant community. Warming altered the …

Soils Of Temperate Rainforests Of The North American Pacific Coast, Dunbar N. Carpenter, James G. Bockheim, Paul F. Reich

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Temperate rainforests have high conservation and natural resource value, but the soils of this bioregion have not previously been studied as a unit. Here we examine the soils of North America's Pacific coastal temperate rainforests, utilizing databases from the United States Natural Resources Conservation Service and the Canadian Centre for Land and Biological Resources Research to (i) identify the soil taxa, (ii) evaluate the soil properties, and (iii) compare soils in temperate and tropical rainforests. There are strong climate gradientswithin these temperate rainforests,with the mean temperature declining from 11.7 °C to 6.1 °C and the mean annual precipitation increasing from …

A Quantitative Analysis Of The Effect Of Cash-4-Grass Programs On Water Consumption, Cynthia Allen

Walden Dissertations and Doctoral Studies

Water supplies in California are stretched to critical levels as a result of population growth, periodic drought, and climate change. The California legislature recognized that the best way to increase supply is to decrease demand so the Water Use Efficiency Senate Bill 7 (SBx7-7) was signed into law in 2009. The law requires water purveyors to reduce per capita water usage by 20% by the year 2020. To comply, water purveyors are searching for innovative ways to increase water conservation. A review of the literature has shown that many factors influence water consumption. However, the majority of household water consumption …

Statistical And Comparative Phylogeography Of Mexican Freshwater Taxa In Extreme Aquatic Environments, Lyndon M. Coghill

LSU New Orleans Theses and Dissertations

Phylogeography aims to understand the processes that underlie the distribution of genetic variation within and among closely related species. Although the means by which this goal might be achieved differ considerably from those that spawned the field some thirty years ago, the foundation and conceptual breakthroughs made by Avise are nonetheless the same and are as relevant today as they were two decades ago. Namely, patterns of neutral genetic variation among individuals carry the signature of a species’ demographic past, and the spatial and temporal environmental heterogeneity across a species’ geographic range can influence patterns of evolutionary change. Aquatic systems …

First State Record And Interdiction For The Wood Slave, Hemidactylus Mabouia (Moreau De Jonnès 1818) (Gekkonidae), In Maryland, Usa., Louis A. Somma, William L. Grogan Jr.

Papers in Herpetology

The Wood Slave, Hemidactylus mabouia (Moreau de Jonnès 1818; Fig. 1), is indigenous to Africa south of the Sahara, with nonindigenous populations established in Cape Verde, Mexico, much of Central and South America, numerous localities in the Caribbean, perhaps Madagascar, and at least 21 counties in Florida, USA (Carranza and Arnold 2006; Kraus 2009; Krysko et al. 2011a, 2011b; Meshaka 2011; Powell and Henderson 2012). Recently, H. mabouia has successfully invaded temperate regions of southern Africa and northern peninsular Florida (Alexander and Marais 2007, Krysko and Somma 2007).

On 20 December 2012, Brian R. Grogan and Shane Forsythe collected and …

Distribution Of Chinook Salmon (Oncorhynchus Tshawytscha) In Upper-Columbia River Sub-Basins From Environmental Dna Analysis, Matthew Benjamin Laramie

Boise State University Theses and Dissertations

Determining accurate species distribution is crucial to conservation and management strategies for imperiled species, but challenging for small populations that are approaching extinction or being reestablished. We evaluated the efficacy of environmental DNA (eDNA) analysis for improving detection and thus known distribution of Chinook salmon in the Methow and Okanogan Sub-basins of the Upper-Columbia River, Washington, USA. We developed an assay to target a 90 base pair sequence of Chinook DNA and used quantitative polymerase chain reaction (qPCR) to quantify the amount of Chinook eDNA in 1-L water samples collected at 48 sites in the sub-basins. We collected samples once …