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Articles 11431 - 11460 of 19729
Full-Text Articles in Entire DC Network
Temporal Variation In Optical Properties Of Chromophoric Dissolved Organic Matter (Cdom) In Southern California Coastal Waters With Nearshore Kelp And Seagrass, Catherine D. Clark, Warren J. De Bruyn, Paige Aiona
Temporal Variation In Optical Properties Of Chromophoric Dissolved Organic Matter (Cdom) In Southern California Coastal Waters With Nearshore Kelp And Seagrass, Catherine D. Clark, Warren J. De Bruyn, Paige Aiona
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Optical properties of chromophoric dissolved organic matter (CDOM) were measured in surf zone waters in diurnal field studies at a Southern California beach with nearshore kelp and seagrass beds and intertidal plant wrack. Absorption coefficients (aCDOM(300 nm)) ranged from 0.35 m21 to 3.7 m21 with short-term variability<1 h, increases at ebb and flood tides and higher values (6 m21) during an offshore storm event. Spectral slopes (S) ranged from 0.0028 nm21 to 0.017 nm21, with higher values after the storm; S was generally inversely correlated with aCDOM(300 nm). 3-D excitation–emission matrix spectra (EEMs) for samples with lower S values had humic-type peaks associated with terrestrial material (A, C), marine microbial material (M) and protein peaks, characteristic of freshly produced organic material. Samples with high S values had no or reduced protein peaks, consistent with aged material. Fluorescent indexes (f450/f500 >2.5, BIX>1.1) were consistent with microbial aquatic sources. Leachates of senescent kelp and seagrass had protein and humic-type EEM peaks. After solar simulator irradiation (4 h), protein peaks rapidly photochemically degraded, humic-type peak C increased in intensity and peak M disappeared. Optical characteristics of kelp leachates were most similar to field samples, …
Mapping The Movement Of Overwintering Western Monarch Butterflies (Danaus Plexippus) At The Pismo Beach Monarch Butterfly Grove Using Arcgis Software, Brett Johnson, Jesse Wycko, Daniel Goldthwaite, Tyler Brown
Mapping The Movement Of Overwintering Western Monarch Butterflies (Danaus Plexippus) At The Pismo Beach Monarch Butterfly Grove Using Arcgis Software, Brett Johnson, Jesse Wycko, Daniel Goldthwaite, Tyler Brown
Symposium
Dr. Villablanca of the Cal Poly Biology Department commissioned this project with the goal of tracking Monarch Butterfly spatial redistribution in anticipation of or response to severe weather events. We believe that Monarchs cluster non-preferentially on introduced Eucalyptus trees until midwinter when they begin to cluster preferentially on native conifers. Based on the efforts of a previous group of students, it has been deter- mined that, over a two-week time period in mid-winter, Monarchs spend the majority of their time on native conifers. We set out to clearly demonstrate Monarch Butterfly spatial redistribution in either anticipation of or response to …
Métodos Cuantitativos Para La Conservación De Los Vertebrados, Michael J. Conroy, John P. Carroll, Juan Carlos Senar, Jeffrey J. Thompson
Métodos Cuantitativos Para La Conservación De Los Vertebrados, Michael J. Conroy, John P. Carroll, Juan Carlos Senar, Jeffrey J. Thompson
School of Natural Resources: Faculty Publications
Este libro es destinado para el uso por biólogos del campo y otras personas, incluso biólogos de campo en el futuro que podrían estar en un curso de la universidad y trabajando en estudios y conservación de animales. Nuestro objetivo es que los biólogos usen este libro como (haciendo apología a nuestro colega Evan Cooch) una “introducción suave” al campo de la ecología cuantitativa. Esperamos convencer a los lectores que los métodos y aproximaciones del libro no son solo para los matemáticos, estadísticos y programadores de computadoras, sino que de hecho son herramientas esenciales para practicar la conservación en el …
Multi-Scale Environmental Filters And Niche Partitioning Govern The Distributions Of Riparian Vegetation Guilds, Nate Hough-Snee, Brian G. Laub, David M. Merritt, Arin Lexine Long, Lloyd L. Nackley, Brett B. Roper, Joseph Michael Wheaton
Multi-Scale Environmental Filters And Niche Partitioning Govern The Distributions Of Riparian Vegetation Guilds, Nate Hough-Snee, Brian G. Laub, David M. Merritt, Arin Lexine Long, Lloyd L. Nackley, Brett B. Roper, Joseph Michael Wheaton
Watershed Sciences Faculty Publications
Across landscapes, riparian plant communities assemble under varying levels of disturbance, environmental stress, and resource availability, leading to the development of distinct riparian life-history guilds over evolutionary timescales. Identifying the environmental filters that exert selective pressures on specific riparian vegetation guilds is a critical step in setting baseline expectations for how riparian vegetation may respond to environmental conditions anticipated under future global change scenarios. In this study, we ask: (1) What riparian plant guilds exist across the interior Columbia and upper Missouri River basins? (2) What environmental filters shape riparian guild distributions? (3) How does resource partitioning among guilds influence …
Assessment Of Coral Health And Fish Diversity In The Fringing Reefs Of Porvenir Island And Korbisky Island, Guna Yala, Panama, Emily Waddell
Assessment Of Coral Health And Fish Diversity In The Fringing Reefs Of Porvenir Island And Korbisky Island, Guna Yala, Panama, Emily Waddell
Independent Study Project (ISP) Collection
Coral reefs are the most diverse and productive ecosystems on Earth, serving as important habitats to millions of organisms; however, they are disappearing at alarming rates. The major influences causing their decline are the combined effects of global climate change and increased industrialization, urbanization, and agriculture. Previous studies have correlated high coral coverage with high fish diversity; therefore, as coral reefs disappear, so too does fish diversity. This study assesses the health of the fringe reefs of Porvenir Island and Korbisky Island in Guna Yala, Panama by recording the live coral, bleached coral, diseased coral, and algae cover of each …
Promoting Predators And Compassionate Conservation, Arian D. Wallach, Marc Bekoff, Michael Paul Nelson, David Ramp
Promoting Predators And Compassionate Conservation, Arian D. Wallach, Marc Bekoff, Michael Paul Nelson, David Ramp
Conservation Collection
No abstract provided.
Virginia’S Land Mammals: Past And Present, With Some Thoughts About Their Possible Future, John F. Pagels, Nancy D. Moncrief
Virginia’S Land Mammals: Past And Present, With Some Thoughts About Their Possible Future, John F. Pagels, Nancy D. Moncrief
Virginia Journal of Science
Mammals encountered today in Virginia’s forests and fields include native and nonnative species, feral populations, and free-ranging pets. We examine factors that have influenced Virginia’s terrestrial mammal fauna since the arrival of European colonists in the 1600s and some of the factors that are shaping the fauna today. We look in depth at changes since Handley and Patton’s (1947) first complete monograph on Virginia mammals and augment Linzey’s (1998) book, The Mammals of Virginia. We include current nomenclature, baseline information, and references to comprehensive literature. We discuss some of the current and developing anthropogenic factors that have impacted, or that …
Abejas Silvestres (Himenóptera: Apoidea) En La Neblina: Análisis De La Diversidad, Interacciones, Y Potencial Para Miel En Un Remanente De Bosque Nublado, Jen Hayes
Independent Study Project (ISP) Collection
Las abejas (Himenóptera: Apoidea) se encuentran en casi cada una de las bioregiones en el mundo. Su composición es muy diversa en los neotrópicos. Las abejas silvestres (no-Apis) representan casi el 90% de las especies de abejas en todo el mundo (Parra, 2005). Los objetivos principales de este estudio fueron realizar un inventario de las especies de abejas al final de la estación seca, observar sus interacciones intra-específicas, y determinar el potencial de producción de miel medicinal de las abejas sin aguijón (Apidae: Meliponini). El estudio fue realizado en la Reserva Inti Llacta, un remanente de bosque nublado …
Lingcod (Ophiodon Elongatus) Habitat Associations: Implications For Conservation And Management, Megan Bassett
Lingcod (Ophiodon Elongatus) Habitat Associations: Implications For Conservation And Management, Megan Bassett
SNS Master's Theses
Understanding the spatial distribution of marine species and the temporal and spatial scales of the processes that drive those distributions continues to be limited, but is increasingly more critical with the implementation of marine spatial planning. Lingcod (Ophiodon elongatus) are a common demersal fish found from southern Alaska to Baja California, and are exploited both commercially and recreationally across the entirety of their range. Due to stock declines, Lingcod are managed using a variety of fisheries management tools, including spatial management. This study represents a unique in situ investigation of demersal habitat utilization by Lingcod at the southern portion of …
When An Invasive Plant Fails To Invade, Stephen L. Young
When An Invasive Plant Fails To Invade, Stephen L. Young
West Central Research and Extension Center, North Platte
In 2012, much of the US Midwest was gripped in one of the most severe droughts on record. While conducting experimental fieldwork at a site in Nebraska during June of that year, I noticed a single musk thistle (Carduus nutans; Figure 1) that appeared to be in the bolt or early flowering stage, which is typical for the species at that time. Here, however, two things were unusual: this plant was less than 1 meter tall (with adequate moisture and light, musk thistle typically grows to heights of 1–2.5 meters before flowering), and was only 3 months old (the bolt …
Breeding Birds Of Virginia, Bryan D. Watts
Breeding Birds Of Virginia, Bryan D. Watts
Virginia Journal of Science
Virginia supports a diverse community of breeding birds that has been the focus of investigation for more than 400 years. The avifauna reflects the latitudinal position of the state and the fact that the border extends from the Atlantic Ocean to the Appalachian Mountains. A total of 224 species have been recorded breeding in Virginia, 214 of which are extant. Twenty species have colonized the state since 1900 including 14 since 1950. Of all extant species, 102 (48%) are considered common at least somewhere in the state and 64 (30%) are rare to very rare. Diversity varies by physiographic region …
Virginia’S Amphibians: Status, Threats And Conservation, Jennifer Sevin, John D. Kleopfer
Virginia’S Amphibians: Status, Threats And Conservation, Jennifer Sevin, John D. Kleopfer
Virginia Journal of Science
Virginia’s diverse environments support 84 amphibian species (anurans and caudates), making it the third highest state in terms of species richness. However, the Commonwealth matches the global trend in declining amphibian populations with over one-third of its amphibian species in conservation need. The Species of Greatest Conservation Need included in the most recent Virginia Wildlife Action Plan cut across amphibian families and ecoregions. It is challenging to ascertain the exact cause of most of the population declines. In one degree or another, all of the global threats to amphibians exist within Virginia’s borders. While an active research program on amphibians …
Gazetteer And Site-Based History Of The Ornithology Of Sabah. Malaysian Borneo, Frederick H. Sheldon
Gazetteer And Site-Based History Of The Ornithology Of Sabah. Malaysian Borneo, Frederick H. Sheldon
Occasional Papers of the Museum of Natural Science, Louisiana State University
The gazetteer lists sites in the state of Sabah, Malaysia, where birds have been collected, studied, or watched. Its purpose is to identify locations for research and birding in Sabah and to provide a brief scientific history of the more important sites. Each site description includes latitude, longitude, and general information on location. For many sites, elevation, habitat, scientific or birdwatching importance, historical notes, citations of key papers, specimen records, and records of certain species are also included.
Wildfire Disturbance And Productivity As Drivers Of Plant Species Diversity Across Spatial Scales, Laura A. Burkle, Jonathan A. Myers, R Travis Belote
Wildfire Disturbance And Productivity As Drivers Of Plant Species Diversity Across Spatial Scales, Laura A. Burkle, Jonathan A. Myers, R Travis Belote
Biology Faculty Research
Wildfires influence many temperate terrestrial ecosystems worldwide. Historical environmental heterogeneity created by wildfires has been altered by human activities and will be impacted by future climate change. Our ability to predict the impact of wildfire-created heterogeneity on biodiversity is limited because few studies have investigated variation in community composition (beta-diversity) in response to fire. Wildfires may influence beta-diversity through several ecological mechanisms. First, high-severity fires may decrease beta-diversity by homogenizing species composition when they create landscapes dominated by disturbance-tolerant or rapidly colonizing species. In contrast, mixed-severity fires may increase beta-diversity by creating mosaic landscapes containing habitats that support species with …
Essential Questions, Imsa Biology Team
Essential Questions, Imsa Biology Team
Evolution
In order to understand the current state of biological life and how it has changed over time, the following questions must be addressed:
Evidence Of Evolution 1: Structures, Imsa Biology Team
Evidence Of Evolution 1: Structures, Imsa Biology Team
Evolution
In order to investigate linage, evolutionary history, and common ancestry, you need to be familiar with the following structures.
Mechanisms And Speciation 1: The Modern Synthesis, Imsa Biology Team
Mechanisms And Speciation 1: The Modern Synthesis, Imsa Biology Team
Evolution
The Modern Synthesis or Synthetic Theory of Evolution is an explanation of evolution that is based on modern genetic principles. According to the Modern Synthesis (a.k.a. Neo-Darwinism):
Evolution Practice 1, Imsa Biology Team
Evolution Practice 1, Imsa Biology Team
Evolution
Answer the following questions using information from the handouts, and examples from the LAB
Evolution Practice 2, Imsa Biology Team
Common Mistakes In Discussing Evolution, Sarah O'Leary-Driscoll
Common Mistakes In Discussing Evolution, Sarah O'Leary-Driscoll
Evolution
No abstract provided.
Genetic Drift Simulation, Imsa Biology Team
Genetic Drift Simulation, Imsa Biology Team
Evolution
Genetic drift can be defined as a random fluctuation in gene frequency. More specifically, it tells us that different alleles may increase or decrease in a population in proportion to one another over time, just by chance, rather than due to any fitness advantage.
Constraints On The Evolution Of Phenotypic Plasticity: Limits And Costs Of Phenotype And Plasticity, C. J. Murren, Josh R. Auld, H. Callahan, C. K. Ghalambor, C. A. Handelsman, M. A. Heskel, J. G. Kingsolver, H. J. Maclean, J. Masel, H. Maughan, D. W. Pfennig, R. A. Relyea, S. Seiter, E. Snell-Rood, U. K. Steiner, C. D. Schlichting
Constraints On The Evolution Of Phenotypic Plasticity: Limits And Costs Of Phenotype And Plasticity, C. J. Murren, Josh R. Auld, H. Callahan, C. K. Ghalambor, C. A. Handelsman, M. A. Heskel, J. G. Kingsolver, H. J. Maclean, J. Masel, H. Maughan, D. W. Pfennig, R. A. Relyea, S. Seiter, E. Snell-Rood, U. K. Steiner, C. D. Schlichting
Biology Faculty Publications
No abstract provided.
Evidence Of Evolution 3: Evolutionary Evidence And Inferences Lab: A Discussion Guide, Imsa Biology Team
Evidence Of Evolution 3: Evolutionary Evidence And Inferences Lab: A Discussion Guide, Imsa Biology Team
Evolution
This lab activity was designed to provide you with opportunities to make inferences and draw conclusions about evolution and the common ancestry of various animals based on their anatomical characteristics and comparative anatomy. You will be given tasks to accomplish or questions to answer at each of 11 stations. In order to do this successfully, you must make careful observations of the specimens on display.
Evidence Of Evolution 2: Definitions For Evolutionary Evidence Lab, Imsa Biology Team
Evidence Of Evolution 2: Definitions For Evolutionary Evidence Lab, Imsa Biology Team
Evolution
This lab activity was designed to provide you with opportunities to make inferences and draw conclusions about evolution and the common ancestry of various animals based on their anatomical characteristics and comparative anatomy. You will be given tasks to accomplish or questions to answer at each of 11 stations. In order to do this successfully, you must make careful observations of the specimens on display. You must also know the following definitions before beginning this activity:
Mechanisms And Speciation 2: Evolution On The Web Questions, Imsa Biology Team
Mechanisms And Speciation 2: Evolution On The Web Questions, Imsa Biology Team
Evolution
The website below, sponsored by UC Berkeley, is a reliable source for information about evolution. This will give you the introductory information about the mechanisms of Evolution.
Crash Course Evolution Videos Bibliography, Imsa Biology Team
Crash Course Evolution Videos Bibliography, Imsa Biology Team
Evolution
No abstract provided.
Temporal Variability And Cooperative Breeding: Testing The Bet-Hedging Hypothesis In The Acorn Woodpecker, Walter D. Koenig, Eric L. Walters
Temporal Variability And Cooperative Breeding: Testing The Bet-Hedging Hypothesis In The Acorn Woodpecker, Walter D. Koenig, Eric L. Walters
Biological Sciences Faculty Publications
Cooperative breeding is generally considered an adaptation to ecological constraints on dispersal and independent breeding, usually due to limited breeding opportunities. Although benefits of cooperative breeding are typically thought of in terms of increased mean reproductive success, it has recently been proposed that this phenomenonmay be a bet-hedging strategy that reduces variance in reproductive success (fecundity variance) inpopulations living inhighly variable environments. We tested this hypothesis using long-term data on the polygynandrous acorn woodpecker (Melanerpes formicivorus). In general, fecundity variance decreased with increasing sociality, at least when controlling for annual variation in ecological conditions. Nonetheless, decreased fecundity variance …
An Invasive Grass And A Desert Adapted Rodent: Is There An Effect On Locomotory Performance And Is It Modified By Prior Experience Or Familiarization?, Camille D. Boag
An Invasive Grass And A Desert Adapted Rodent: Is There An Effect On Locomotory Performance And Is It Modified By Prior Experience Or Familiarization?, Camille D. Boag
Master's Theses
Kangaroo rats (Dipodomys spp.) are frequently characterized as keystone species for their role in altering soil characteristics, changing habitat structure through seed consumption and dispersal, and being important primary consumers in their ecosystem. They are arid adapted and known to forage in areas with sparse vegetation. Studies suggests densely vegetated habitat to be unsuitable for kangaroo rats because plants are an impediment to their locomotion and predator avoidance behaviors. This study focuses on an invasive grass, South African Veldt (Ehrharta calycina), that converts landscapes with sparse vegetation into dense grassland habitats, and the Lompoc kangaroo rat …
Effects Of Supplemental Hydration On Physiology And Behavior Of Northern Pacific Rattlesnakes (Crotalus Oreganus Oreganus), Griffin D. Capehart
Effects Of Supplemental Hydration On Physiology And Behavior Of Northern Pacific Rattlesnakes (Crotalus Oreganus Oreganus), Griffin D. Capehart
Master's Theses
Hydration is a critical element for many physiological processes in vertebrates, such as protein production, innate immunity, and behavioral processes such as daily activity and thermoregulation. Few studies have directly assessed the effect of hydration on these animals in nature. While it seems intuitive that drought is stressful to animals, studies examining drought are typically observational and fail to assess how the hydration state of these animals influences their physiology and behavior. We tested for an effect of hydration on several physiological and behavioral parameters in Northern Pacific rattlesnakes (Crotalus oreganus oreganus) by experimentally manipulating hydration levels in …
Bleaching, Disease, And Colonization: The Ecology Of Coral Health In Southeastern Nosy Be, Madagascar, Luella Allen-Waller
Bleaching, Disease, And Colonization: The Ecology Of Coral Health In Southeastern Nosy Be, Madagascar, Luella Allen-Waller
Independent Study Project (ISP) Collection
Coral reefs constitute irreplaceable networks of marine biodiversity as well as an important economic resource to many coastal communities in the tropics. Many factors threaten these fragile ecosystems worldwide: overfishing, pollution, ocean acidification, and increasing sea temperatures all interact to diminish reef-building coral health in a variety of ways. This study aims to characterize the taxonomic and spatial patterns of several acute negative health conditions affecting hard corals in and near Lokobe National Park, Nosy Be, Madagascar. Bleaching, coral disease, filamentous algal overgrowth, and soft coral colonization were surveyed at six fringing reef sites representing different ecological zones. While Acropora …