Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Astrophysics and Astronomy (79)
- Physics (26)
- Earth Sciences (25)
- Environmental Sciences (23)
- Life Sciences (18)
-
- Geology (14)
- Natural Resources and Conservation (12)
- Oceanography and Atmospheric Sciences and Meteorology (11)
- Ecology and Evolutionary Biology (9)
- Paleontology (9)
- Social and Behavioral Sciences (9)
- Stars, Interstellar Medium and the Galaxy (8)
- Other Environmental Sciences (7)
- Environmental Monitoring (5)
- Animal Sciences (4)
- Biodiversity (4)
- Climate (4)
- Applied Mathematics (3)
- Arts and Humanities (3)
- Biology (3)
- Chemistry (3)
- Environmental Health and Protection (3)
- External Galaxies (3)
- Geochemistry (3)
- Medicine and Health Sciences (3)
- Natural Resources Management and Policy (3)
- Other Ecology and Evolutionary Biology (3)
- Paleobiology (3)
- Plant Biology (3)
- Institution
-
- University of Kentucky (26)
- Selected Works (17)
- University of Massachusetts Amherst (17)
- University of Nebraska - Lincoln (9)
- University of Louisville (7)
-
- Clemson University (6)
- The University of Maine (6)
- Roger Williams University (5)
- Smith College (5)
- Missouri University of Science and Technology (3)
- Nova Southeastern University (2)
- Old Dominion University (2)
- The University of San Francisco (2)
- TÜBİTAK (2)
- University of Massachusetts Boston (2)
- University of South Florida (2)
- University of Wollongong (2)
- Western Washington University (2)
- Air Force Institute of Technology (1)
- Bellarmine University (1)
- Boise State University (1)
- Cedarville University (1)
- Chapman University (1)
- Claremont Colleges (1)
- Dartmouth College (1)
- Embry-Riddle Aeronautical University (1)
- Macalester College (1)
- Montclair State University (1)
- Munster Technological University (1)
- Rhode Island School of Design (1)
- Publication Year
- Publication
-
- Physics and Astronomy Faculty Publications (22)
- Astronomy Department Faculty Publication Series (10)
- Faculty Scholarship (7)
- Publications (7)
- Arts & Sciences Faculty Publications (5)
-
- Benne Holwerda (5)
- Marine Sciences Faculty Scholarship (5)
- Chemistry Faculty Research & Creative Works (3)
- Daniela Calzetti (3)
- Donald D Clayton (3)
- Geosciences: Faculty Publications (3)
- School of Natural Resources: Faculty Publications (3)
- IGC Proceedings (1997-2023) (2)
- Min S. Yun (2)
- New England Journal of Public Policy (2)
- Physics and Astronomy (2)
- Richard G Roberts (2)
- Steve Webb (2)
- Theses and Dissertations--Physics and Astronomy (2)
- United States Geological Survey: Staff Publications (2)
- All Dissertations (1)
- Animal Studies Journal (1)
- Articles (1)
- Astronomy: Faculty Publications (1)
- Biological Sciences Faculty Publications (1)
- Biological Sciences Theses & Dissertations (1)
- Biological Sciences: Faculty Publications (1)
- Biology, Chemistry, and Environmental Sciences Faculty Articles and Research (1)
- Blackrock Castle Observatory Publications (1)
- C. Martin Gaskell Publications (1)
- Publication Type
- File Type
Articles 1 - 30 of 145
Full-Text Articles in Physical Sciences and Mathematics
Life On The Edge: The Cambrian Marine Realm And Oxygenation, Sara Pruss, Benjamin C. Gill
Life On The Edge: The Cambrian Marine Realm And Oxygenation, Sara Pruss, Benjamin C. Gill
Geosciences: Faculty Publications
The beginning of the Phanerozoic saw two biological events that set the stage for all life that was to come: (a) the Cambrian Explosion (the appearance of most marine invertebrate phyla) and (b) the Great Ordovician Biodiversification Event (GOBE), the subsequent substantial accumulation of marine biodiversity. Here, we examine the current state of understanding of marine environments and ecosystems from the late Ediacaran through the Early Ordovician, which spans this biologically important interval. Through a compilation and review of the existing geochemical, mineralogical, sedimentological, and fossil records, we argue that this interval was one of sustained low and variable marine …
Sarah Pohjola, Senior Art Exhibition Portfolio, Earth's Destruction, Sarah Pohjola
Sarah Pohjola, Senior Art Exhibition Portfolio, Earth's Destruction, Sarah Pohjola
Senior Art Portfolios
This work was created for the Senior Art Exhibition Portfolio 2024. This work includes graphic design and illustration focused on environmental conservation.
After Awhile...Crocodile?: An Assessment Of Crocodylians As Living Fossils, Caleb N. Lepore
After Awhile...Crocodile?: An Assessment Of Crocodylians As Living Fossils, Caleb N. Lepore
Proceedings of the International Conference on Creationism
Crocodylians, which include extant crocodiles, alligators, caimans, the gharial, and the tomistoma, are often considered living fossils. Many evolutionists have argued that the term ‘living fossil’ is inappropriately applied to crocodylians, since past diversity within Crocodylia, as well as within the more inclusive group Crocodylomorpha, implies that they have evolved substantially since their first appearance in the fossil record. In contrast, many creationists argue that the morphological conservativeness of living fossils like crocodylians is unexpected from a gradualistic model of evolution. To clarify this issue, we argue that while the term ‘living fossil’ has varied meanings within the literature, morphological …
A Multidisciplinary Approach To Resolving The End-Guadalupian Extinction, Christopher R. Fielding, Scott E. Bryan, James L. Crowley, Tracy D. Frank, Michael T. Hren, Chris Mays, Stephen Mcloughlin, Jun Shen, Peter J. Wagner, Arne Winguth, Cornelia Winguth
A Multidisciplinary Approach To Resolving The End-Guadalupian Extinction, Christopher R. Fielding, Scott E. Bryan, James L. Crowley, Tracy D. Frank, Michael T. Hren, Chris Mays, Stephen Mcloughlin, Jun Shen, Peter J. Wagner, Arne Winguth, Cornelia Winguth
Geosciences Faculty Publications and Presentations
The transition from the middle to late Permian (Guadalupian–Lopingian) is claimed to record one or more extinction events that rival the ‘Big Five’ in terms of depletion of biological diversity and reorganization of ecosystem structure. Yet many questions remain as to whether the events recorded in separate regions were synchronous, causally related, or were of a magnitude rivaling other major crises in Earth's history. In this paper, we survey some major unresolved issues related to the Guadalupian–Lopingian transition and offer a multidisciplinary approach to advance understanding of this under-appreciated biotic crisis by utilizing records in Southern Hemisphere high-palaeolatitude settings. We …
Delving Deep: A Population Of Extremely Dusty Dwarfs Observed By Jwst, L. Bisigello, G. Gandolfi, A. Grazian, G. Rodighiero, L. Costantin, A. R. Cooray, A. Feltre, C. Gruppioni, N. P. Hathi, Benne W. Holwerda, A. M. Koekemoer, R. A. Lucas, J. A. Newman, P. G. Pérez-González, L. Y. A. Yung, A. De La Vega, P. Arrabal Haro, M. B. Bagley, M. Dickinson, S. L. Finkelstein, J. S. Kartaltepe, C. Papovich, N. Pirzkal, S. Wilkins
Delving Deep: A Population Of Extremely Dusty Dwarfs Observed By Jwst, L. Bisigello, G. Gandolfi, A. Grazian, G. Rodighiero, L. Costantin, A. R. Cooray, A. Feltre, C. Gruppioni, N. P. Hathi, Benne W. Holwerda, A. M. Koekemoer, R. A. Lucas, J. A. Newman, P. G. Pérez-González, L. Y. A. Yung, A. De La Vega, P. Arrabal Haro, M. B. Bagley, M. Dickinson, S. L. Finkelstein, J. S. Kartaltepe, C. Papovich, N. Pirzkal, S. Wilkins
Faculty Scholarship
Aims. We take advantage of the NIRCam photometric observations available as part of the Cosmic Evolution Early Release Science survey (CEERS) to identify and analyse very red sources in an effort to discover very dusty star forming galaxies. Methods. We select red galaxies as objects with a S / N > 3 at 4.4 μm and a S / N < 2 in all JWST and HST filters at λ ≤ 2 μm, which corresponds to [ F 200 W ]−[ F 444 W ]> 1.2 considering CEERS depths. This selection is ideal to identify very dusty ( A V > 1 mag) galaxies with stellar masses between 10 6 and 10 10 M ⊙ at z < 5, more massive dusty galaxies at z = 5 − 18 and galaxies at z > 18 due to the Lyman absorption, independently of their dust …
The Influence Of Local Immigration And Extinction Of Species On Spatial Heterogeneity Of Vegetation In Semi-Natural Grasslands In Japan, Taisuke Yasuda, Masae Shiyomi, T. Egawa, K. Sei, R. Ishikawa, S. Takahashi
The Influence Of Local Immigration And Extinction Of Species On Spatial Heterogeneity Of Vegetation In Semi-Natural Grasslands In Japan, Taisuke Yasuda, Masae Shiyomi, T. Egawa, K. Sei, R. Ishikawa, S. Takahashi
IGC Proceedings (1997-2023)
Spatiotemporal variation in the local immigration and extinction of species in a community may form and change the spatial heterogeneity (SH) of vegetation but few studies have evaluated the influences of these processes on SH. SH often occurs in grassland grazed by cattle and sheep. Understanding the formation and dynamics of SH is important because SH profoundly affects local and regional ecological processes. We propose a new way to quantify the effect of the local immigration and extinction of species on SH, and try to clarify the influence of the processes on SH
Access In Ambiguity, Moritz Lónyay
Access In Ambiguity, Moritz Lónyay
Masters Theses
The wealth of color present in nature has long been a major source of inspiration for works of art and design. Yet as more species become extinct due to habitat loss, climate change and unchecked hunting, will we face a less colorful, more monotonous future? How will this impact art and design and how could either be utilized as tools to counteract the loss of color? This thesis speculates upon such a future by the sixth wave of mass extinction and instigates a movement that celebrates color. Growing up in the Anthropocene, the first geological epoch in which human existence …
Land Use History And The Build-Up And Decline Of Species Richness In Scandinavian Semi-Natural Grasslands, O. Eriksson, S. A. O. Cousins, R. Lindborg
Land Use History And The Build-Up And Decline Of Species Richness In Scandinavian Semi-Natural Grasslands, O. Eriksson, S. A. O. Cousins, R. Lindborg
IGC Proceedings (1997-2023)
Scandinavian semi-natural grasslands have an exceptionally high small-scale species richness. In the past, these grasslands covered extensive areas but they have declined drastically during the last century. How species richness of semi-natural grasslands was built up during history, and how species respond to land use change, are discussed. The agricultural expansion from the late Iron Age was associated with increasing grassland extent and spatial predictability, resulting in accumulation of species at small spatial scales. Although few species directly depend on management, the specific composition of these grasslands is a product of haymaking and grazing. Grassland fragmentation initially has small effects …
The Mystery Of The Missing Megafauna, Maggie Colangelo, Bernard Means
The Mystery Of The Missing Megafauna, Maggie Colangelo, Bernard Means
Virtual Curation Lab's Comic Publications
The creative team behind Founding Monsters and Founding Monsters Tales have created a new comic that takes a more scientific and less historic approach to the giant mammals that once roamed North America. The Mystery of the Missing Megafauna explores how changing climate impacted biodiversity and megafauna populations in North America at the end of the last Ice Age. Particular attention is placed on the extinction of mastodons, mammoths, giant ground sloths and other megafauna whose fossils are found at Saltville in southwestern Virginia. This comic draws a connection to contemporary climate change and the major extinctions happening today. The …
Rhetorics Of Species Revivalism And Biotechnology – A Roundtable Dialogue, Eva Kasprzycka, Charlotte Wrigley, Adam Searle, Richard Twine
Rhetorics Of Species Revivalism And Biotechnology – A Roundtable Dialogue, Eva Kasprzycka, Charlotte Wrigley, Adam Searle, Richard Twine
Animal Studies Journal
This informal dialogue contextualises and explores contemporary practices of nonhuman animal gene-modification in de-extinction projects. Looking at recent developments in biotechnology’s role in de-extinction sciences and industries, these interdisciplinary scholars scrutinise the neoliberal impetus driving ‘species revivalism’ in the wake of the Capitalocene. Critical examinations of species integrity, cryo-preservation, techno-optimism, rewilding initiatives and projects aimed at restoring extinct animals such as the woolly mammoth and bucardo are used to map some of the necessary restructuring of conservation policies and enterprises that could secure viably sustainable – and just – futures for nonhuman animals at risk of extinction. The authors question …
A Miocene Nannofossil Biostratigraphic Case Study: Alaminos Canyon Block 627 And Mississippi Canyon Block 555, And Sedimentation Rates In The Gulf Of Mexico, Bethany L. Cobb Faulk, Murlene W. Clark
A Miocene Nannofossil Biostratigraphic Case Study: Alaminos Canyon Block 627 And Mississippi Canyon Block 555, And Sedimentation Rates In The Gulf Of Mexico, Bethany L. Cobb Faulk, Murlene W. Clark
Gulf and Caribbean Research
The Miocene sediments of 2 deep—water boreholes from the northern Gulf of Mexico, from Alaminos Canyon (AC) Block 627 and Mississippi Canyon (MC) Block 555, have been biostratigraphically analyzed using calcareous nannofossils, revealing changes in sedimentation rates and depositional environments between these 2 areas. High nannofossil abundance values and low sedimentation rates generally recorded in the Alaminos Canyon region suggest a condensed section during much of the Miocene, associated with a basinal environment. Mississippi Canyon exhibits lower nannofossil abundance and higher sedimentation rates compared to Alaminos Canyon during the majority of the Miocene. Increased sediment volumes are largely attributed to …
The Role Of Carbonate Factories And Sea Water Chemistry On Basin-Wide Ramp To High-Relief Carbonate Platform Evolution: Triassic, Nanpanjiang Basin, South China, Daniel J. Lehrmann, Leanne M. Stepchinski, Hannah E. Wolf, Liangzi Li, Xiaowei Li, Marcello Minzoni, Meiyi Yu, Jonathan L. Payne
The Role Of Carbonate Factories And Sea Water Chemistry On Basin-Wide Ramp To High-Relief Carbonate Platform Evolution: Triassic, Nanpanjiang Basin, South China, Daniel J. Lehrmann, Leanne M. Stepchinski, Hannah E. Wolf, Liangzi Li, Xiaowei Li, Marcello Minzoni, Meiyi Yu, Jonathan L. Payne
Geosciences Faculty Research
The end-Permian extinction and its aftermath altered carbonate factories globally for millions of years, but its impact on platform geometries remains poorly understood. Here, the evolution in architecture and composition of two exceptionally exposed platforms in the Nanpanjiang Basin are constrained and compared with geochemical proxies to evaluate controls on platform geometries. Geochemical proxies indicate elevated siliciclastic and nutrient fluxes in the basal Triassic, at the Induan—Olenekian boundary and in the uppermost Olenekian. Cerium/Ce* shifts from high Ce/Ce* values and a lack of Ce anomaly indicating anoxia during the Lower Triassic to a negative Ce anomaly indicating oxygenation in the …
Reconstructing Bison And Mammoth Migration During The Late Pleistocene And Early Holocene Of Central Texas Using Strontium Isotopes, Joshua John Porter
Reconstructing Bison And Mammoth Migration During The Late Pleistocene And Early Holocene Of Central Texas Using Strontium Isotopes, Joshua John Porter
Graduate Theses and Dissertations
During the Late Pleistocene (LP; past 130,000 years), over two-thirds of large mammal (>45kg) species went extinct globally. While the role of humans is hotly debated, the effect of these extinctions is growing clearer; the extinctions resulted in widespread and lasting faunal community reorganization. However, the impact of these extinctions on dietary and migratory behavior within faunal communities is unknown. Our study examines the impact of the megafaunal extinctions on the dietary and migratory behavior of surviving Bison individuals in Texas using carbon, oxygen, and strontium isotopes. Strontium isotopes are incorporated into mammalian enamel during their tooth development and …
Stellar Parameter Determination For The Mastar Stellar Library, Daniel J. Lazarz
Stellar Parameter Determination For The Mastar Stellar Library, Daniel J. Lazarz
Theses and Dissertations--Physics and Astronomy
Empirical libraries of stellar spectra represent a key ingredient needed for modeling the integrated spectra of stellar populations, such as galaxies, through a process called stellar population synthesis (SPS). In order to make use of such libraries, accurate stellar atmospheric parameter estimates are required. Here, I present a methodology that was developed to build a stellar parameter catalog to accompany the MaNGA stellar library (MaStar), a comprehensive collection of empirical, medium-resolution stellar spectra. This parameter catalog was constructed using a multicomponent χ2 fitting approach to match the MaStar spectra to models generated by interpolating the ATLAS9-based BOSZ models. The …
Extinction And Growth On An Inhomogeneous Seascape, Tung Tran, Mehran Kardar
Extinction And Growth On An Inhomogeneous Seascape, Tung Tran, Mehran Kardar
Turkish Journal of Physics
The effects of noise and nonuniformity on dynamics of populations are relevant and timely subjects of investigation. One form of variation is the time dependence of the reproduction rate (fitness), referred to as ?seascape? noise; another is time-independent intrinsic dependencies of fitness on location (in the parlance of statistical physics, corresponding to annealed and quenched disorder, respectively). The former was studied recently and demonstrated to lead to novel universality classes for extinction and growth. To reduce the gap between this theoretical model and reality, we develop a new formalism for seascape noise where growth and migration parameters are inhomogeneous. In …
Overfishing Drives Over One-Third Of All Sharks And Rays Toward A Global Extinction Crisis, Nicholas K. Dulvy, Nathan Pacoureau, Cassandra L. Rigby, Riley A. Pollom, Rima W. Jabado, David A. Ebert, Brittany Finucci, Caroline M. Pollock, Jessica Cheok, Danielle H. Derrick, Katelyn B. Herman, C. Samantha Sherman, Wade J. Vanderwright, Julia M. Lawson, Rachel H.L. Walls, John K. Carlson, Patricia Charvet, Kinattumkara K. Bineesh, Daniel Fernando, Gina M. Ralph, Jay H. Matsushiba, Craig Hilton-Taylor, Sonja V. Fordham, Colin A. Simpfendorfer
Overfishing Drives Over One-Third Of All Sharks And Rays Toward A Global Extinction Crisis, Nicholas K. Dulvy, Nathan Pacoureau, Cassandra L. Rigby, Riley A. Pollom, Rima W. Jabado, David A. Ebert, Brittany Finucci, Caroline M. Pollock, Jessica Cheok, Danielle H. Derrick, Katelyn B. Herman, C. Samantha Sherman, Wade J. Vanderwright, Julia M. Lawson, Rachel H.L. Walls, John K. Carlson, Patricia Charvet, Kinattumkara K. Bineesh, Daniel Fernando, Gina M. Ralph, Jay H. Matsushiba, Craig Hilton-Taylor, Sonja V. Fordham, Colin A. Simpfendorfer
Biological Sciences Faculty Publications
The scale and drivers of marine biodiversity loss are being revealed by the International Union for Conservation of Nature (IUCN) Red List assessment process. We present the first global reassessment of 1,199 species in Class Chondrichthyes-sharks, rays, and chimeras. The first global assessment (in 2014) concluded that one-quarter (24%) of species were threatened. Now, 391 (32.6%) species are threatened with extinction. When this percentage of threat is applied to Data Deficient species, more than one-third (37.5%) of chondrichthyans are estimated to be threatened, with much of this change resulting from new information. Three species are Critically Endangered (Possibly Extinct), representing …
Summer To Autumn Population Of Wild Eumaeus Atala On The Ft. Lauderdale Campus Of Nova Southeastern University, Alexandra M. Lens
Summer To Autumn Population Of Wild Eumaeus Atala On The Ft. Lauderdale Campus Of Nova Southeastern University, Alexandra M. Lens
Mako: NSU Undergraduate Student Journal
Eumaeus atala is an endangered tropical butterfly native to the Caribbean and some parts of Florida, USA. Following population reductions primarily due to habitat loss, E. atala populations are now increasing due to conservation efforts of its cycad host plants, especially Zamia integrifolia (coontie). The purpose of this study was to observe, document, and measure the population of wild E. atala on the Ft. Lauderdale, Florida campus of Nova Southeastern University where landscaping use of host plants supports a natural population of E. atala. Forty-four host plants located in two different sites were observed for 14 weeks. One site …
Comparing Dust In Other Galaxies To Dust In Our Galaxy, Fatima Elkhatib
Comparing Dust In Other Galaxies To Dust In Our Galaxy, Fatima Elkhatib
Senior Theses
Interstellar dust in galaxies has a profound effect on the galaxies’ light output and apparent properties as well as on the physical processes connected to star formation. Therefore, to understand the true properties of the galaxies around us, it is important to understand the dust in those galaxies and compare it to the dust in our galaxy. To do this, we study the effects of dust on background quasars by analyzing interstellar reddening and extinction. It has been shown that many quasars look redder and dimmer than the average quasar when observing them from Earth, due to the dust in …
Investigating Biotic Interactions In Deep Time, Danielle Fraser, Laura C. Soul, Anikó B. Tóth, Meghan A. Balk, Jussi T. Eronen, Silvia Pineda-Munoz, Alexandria B. Shupinski, Amelia Villaseñor, W. Andrew Barr, Anna K. Behrensmeyer, Andrew Du, J. Tyler Faith, Nicholas J. Gotelli, Gary R. Graves, Advait M. Jukar, Cindy V. Looy, Joshua H. Miller, Richard Potts, S. Kathleen Lyons
Investigating Biotic Interactions In Deep Time, Danielle Fraser, Laura C. Soul, Anikó B. Tóth, Meghan A. Balk, Jussi T. Eronen, Silvia Pineda-Munoz, Alexandria B. Shupinski, Amelia Villaseñor, W. Andrew Barr, Anna K. Behrensmeyer, Andrew Du, J. Tyler Faith, Nicholas J. Gotelli, Gary R. Graves, Advait M. Jukar, Cindy V. Looy, Joshua H. Miller, Richard Potts, S. Kathleen Lyons
College of Arts and Sciences Faculty Publications
Recent renewed interest in using fossil data to understand how biotic interactions have shaped the evolution of life is challenging the widely held assumption that long-term climate changes are the primary drivers of biodiversity change. New approaches go beyond traditional richness and co-occurrence studies to explicitly model biotic interactions using data on fossil and modern biodiversity. Important developments in three primary areas of research include analysis of (i) macroevolutionary rates, (ii) the impacts of and recovery from extinction events, and (iii) how humans (Homo sapiens) affected interactions among non-human species. We present multiple lines of evidence for an important and …
Quantifying Extinction Risk In Commercial Marine Species, Rondi Nordal
Quantifying Extinction Risk In Commercial Marine Species, Rondi Nordal
Scholars Week
The sustainability of some species is at risk as a result of anthropogenic influences such as climate change and harvest. This study focused on the combined role of economic and ecological factors that can lead to overharvesting of commercial marine species and aimed to understand the relationship between ecological extinction risk, biological productivity, and economic value. We used existing economic, ecological, and extinction risk data and compiled it for use in the analysis. We focused on maximum sustainable yield as an indicator of productivity, economic data that indicated the landed value of a species, and International Union for the Conservation …
End-Permian (252 Mya) Deforestation, Wildfires And Flooding—An Ancient Biotic Crisis With Lessons For The Present, Vivi Vajda, Stephen Mcloughlin, Chris Mays, Tracy D. Frank, Christopher R. Fielding, Allen Tevyaw, Veiko Lehsten, Malcolm Bocking, Robert S. Nicoll
End-Permian (252 Mya) Deforestation, Wildfires And Flooding—An Ancient Biotic Crisis With Lessons For The Present, Vivi Vajda, Stephen Mcloughlin, Chris Mays, Tracy D. Frank, Christopher R. Fielding, Allen Tevyaw, Veiko Lehsten, Malcolm Bocking, Robert S. Nicoll
Department of Earth and Atmospheric Sciences: Faculty Publications
Current large-scale deforestation poses a threat to ecosystems globally, and imposes substantial and prolonged changes on the hydrological and carbon cycles. The tropical forests of the Amazon and Indonesia are currently undergoing deforestation with catastrophic ecological consequences but widespread deforestation events have occurred several times in Earth’s history and these provide lessons for the future. The end-Permian mass-extinction event (EPE; ∼252 Ma) provides a global, deep-time analogue for modern deforestation and diversity loss. We undertook centimeter-resolution palynological, sedimentological, carbon stable-isotope and paleobotanical investigations of strata spanning the end- Permian event at the Frazer Beach and Snapper Point localities, in the …
Algorithm To Derive Inherent Optical Properties From Remote Sensing Reflectance In Turbid And Eutrophic Lakes, Kun Xue, Emmanuel Boss, Ronghua Ma, Ming Shen
Algorithm To Derive Inherent Optical Properties From Remote Sensing Reflectance In Turbid And Eutrophic Lakes, Kun Xue, Emmanuel Boss, Ronghua Ma, Ming Shen
Marine Sciences Faculty Scholarship
Inherent optical properties play an important role in understanding the biogeochemical processes of lakes by providing proxies for a variety of biogeochemical quantities, including phytoplankton pigments. However, to date, it has been difficult to accurately derive the absorption coefficient of phytoplankton [aph(λ)] in turbid and eutrophic waters from remote sensing. A large dataset of remote sensing of reflectance [ Rrs (λ)] and absorption coefficients was measured for samples collected from lakes in the middle and lower reaches of the Yangtze River and Huai River basin (MLYHR), China. In the process of scattering correction of spectrophotometric measurements, the particulate absorption coefficients …
Global Conservation Status And Threat Patterns Of The World’S Most Prominent Forage Fishes (Teleostei, Clupeiformes), Tiffany L. Birge
Global Conservation Status And Threat Patterns Of The World’S Most Prominent Forage Fishes (Teleostei, Clupeiformes), Tiffany L. Birge
Biological Sciences Theses & Dissertations
Conserving biodiversity is one of the greatest ethical responsibilities and challenges humans face. Understanding the conservation status of taxonomic groups provides a systematic way to prioritize efforts to combat biodiversity loss. The 405 species within the order Clupeiformes are the herrings, shads, sardines, anchovies, menhadens and relatives that include many of the most important marine forage fishes. These small, schooling fishes are economically, ecologically and culturally significant globally. Despite their contribution to global fisheries and our increasing reliance on these fishes for food and industrial commodities, they are generally poorly known with limited information regarding basic biology and population trends. …
A Search For Optical Afterglow From Grb 970828, P. J. Groot, T. J. Galama, J. Van Paradijs, C. Kouveliotou, R. A. M. J. Wijers, J. Bloom, N. Tanvir, R. Vanderspek, J. Greiner, A. J. Castro-Tirado, J. Gorosabel, T. Von Hippel, M. Lehnert, K. Kuijken, H. Hoekstra, N. Metcalfe, C. Howk, C. Conselice, J. Telting, R. G. M. Rutten, J. Rhoads, A. Cole, D. J. Pisano, R. Naber, R. Schwarz
A Search For Optical Afterglow From Grb 970828, P. J. Groot, T. J. Galama, J. Van Paradijs, C. Kouveliotou, R. A. M. J. Wijers, J. Bloom, N. Tanvir, R. Vanderspek, J. Greiner, A. J. Castro-Tirado, J. Gorosabel, T. Von Hippel, M. Lehnert, K. Kuijken, H. Hoekstra, N. Metcalfe, C. Howk, C. Conselice, J. Telting, R. G. M. Rutten, J. Rhoads, A. Cole, D. J. Pisano, R. Naber, R. Schwarz
Ted von Hippel
We report on the results of R-band observations of the error box of the g-ray burst of 1997 August 28 made between 4 hr and 8 days after this burst occurred. No counterpart was found varying by more than 0.2 mag down to R 5 23.8. We discuss the consequences of this nondetection for relativistic blast wave models of g-ray bursts and the possible effect of redshift on the relation between optical absorption and the low-energy cutoff in the X-ray afterglow spectrum.
Using Stable Isotopes To Understand Survival Versus Extinction Of Late Pleistocene Muskoxen, Stephanie Mabee
Using Stable Isotopes To Understand Survival Versus Extinction Of Late Pleistocene Muskoxen, Stephanie Mabee
Electronic Thesis and Dissertation Repository
This thesis uses stable isotopes to investigate the adaptive advantages of Ovibos moschatus, a muskox, relative to now-extinct Pleistocene megafauna in eastern Beringia (Yukon Territory and Alaska), including another muskox Bootherium bombifrons. Ecological niches were defined for Ovibos and Bootherium using stable carbon and nitrogen isotope compositions of bone collagen. Plant remains trapped in modern Ovibos molars were used to determine the carbon and nitrogen isotope collagen-diet discrimination factors, which were then applied to ancient specimens. Ovibos possessed larger isotopic – and hence ecological – niches than Bootherium across eastern Beringian sites. The larger niche suggests that Ovibos …
Mercury Chemostratigraphy Across The Cambrian Series 2 – Series 3 Boundary: Evidence For Increased Volcanic Activity Coincident With Extinction?, L. E. Faggetter, P. B. Wignall, S. B. Pruss, D. S. Jones, S. Grasby, M. Widdowson, R. J. Newton
Mercury Chemostratigraphy Across The Cambrian Series 2 – Series 3 Boundary: Evidence For Increased Volcanic Activity Coincident With Extinction?, L. E. Faggetter, P. B. Wignall, S. B. Pruss, D. S. Jones, S. Grasby, M. Widdowson, R. J. Newton
Geosciences: Faculty Publications
Flood basalt volcanism represented by the Kalkarindji Province (Australia) is temporally associated with a trilobite mass extinction at the Cambrian Series 2 – Series 3 boundary, providing one of the oldest potential links between volcanism and biotic crisis in the Phanerozoic. However, the relative timing of flood basalt volcanism (Kalkarindji Province, Australia) and the trilobite extinctions, first recorded in North America, is not known. Mercury (Hg) enrichment in the sedimentary record provides a potential proxy for volcanism which may facilitate improved chronologies of eruption and extinction. Here we report mercury records for three sections from mid-shelf strata of the Great …
2019 Collaborative Species And Habitat Conservation Efforts In San Diego County: A Systematic Needs Assessment To Guide The San Diego End Extinction Initiative, Tessa Tinkler, Michelle Ahearne, Mary Jo Schumann
2019 Collaborative Species And Habitat Conservation Efforts In San Diego County: A Systematic Needs Assessment To Guide The San Diego End Extinction Initiative, Tessa Tinkler, Michelle Ahearne, Mary Jo Schumann
Environment
This report, prepared by the Caster Family Center for Nonprofit and Philanthropic Research documents the results of a systematic needs assessment prepared for the San Diego End Extinction (SDEE) initiative. The needs assessment was designed to assist SDEE to align its goals and priorities with San Diego County’s existing strengths and gaps in order to proactively prevent the loss of native plants and animals.
On The Brink Of Extinction: The Fate Of The Pacific Northwest's Southern Resident Killer Whales, Sabrina Wilk
On The Brink Of Extinction: The Fate Of The Pacific Northwest's Southern Resident Killer Whales, Sabrina Wilk
Pomona Senior Theses
The killer whales that roam the northeastern Pacific Ocean have been the objects of studies since the 1970s, making them the most well-studied population of orcas in the world. Three distinct ecotypes of killer whales (Orcinus orca), known as residents, transients, and offshores, share these waters. The ecotypes are morphologically and behaviorally distinct to the extent that some scientists consider them separate species, with residents eating salmon, transients specializing on marine mammals, and offshores preferring Pacific sleeper sharks and Pacific halibut. Resident populations have endeared themselves to the region's locals with their striking black and white markings and …
Death-Defying Morphologies: Mass Extinction And Disparity In The Order Harpetida, James Desmond Beech
Death-Defying Morphologies: Mass Extinction And Disparity In The Order Harpetida, James Desmond Beech
Graduate Theses, Dissertations, and Problem Reports
The trilobite order Harpetida has long been easily recognized but poorly understood. This study seeks to better understand the phylogenetic relationships within Harpetida, with a view towards using this group to explore the relationship between extinction intensity and disparity. The harpetid response to the Late Ordovician mass extinction is of particular interest. A discrete morphological character matrix was created from the formal descriptions of harpetids in the published trilobite literature, and refined using first-hand observations of harpetid fossils. The final matrix consists of 76 discrete characters, including 69 cephalic characters, three thoracic characters, and four pygidial characters. This matrix is …
Dust–Gas Scaling Relations And Oh Abundance In The Galactic Ism, Hiep Nguyen, J. R. Dawson, M. -A. Miville-Deschênes, Ningyu Tang, Di Li, Carl Heiles, Claire E. Murray, Snežana Stanimirović, Steven J. Gibson, N. M. Mcclure-Griffiths, Thomas Troland, L. Bronfman, R. Finger
Dust–Gas Scaling Relations And Oh Abundance In The Galactic Ism, Hiep Nguyen, J. R. Dawson, M. -A. Miville-Deschênes, Ningyu Tang, Di Li, Carl Heiles, Claire E. Murray, Snežana Stanimirović, Steven J. Gibson, N. M. Mcclure-Griffiths, Thomas Troland, L. Bronfman, R. Finger
Physics and Astronomy Faculty Publications
Observations of interstellar dust are often used as a proxy for total gas column density NH. By comparing Planck thermal dust data (Release 1.2) and new dust reddening maps from Pan-STARRS 1 and 2MASS, with accurate (opacity-corrected) H I column densities and newly published OH data from the Arecibo Millennium survey and 21-SPONGE, we confirm linear correlations between dust optical depth τ353, reddening E(B − V), and the total proton column density NH in the range (1–30) × 1020 cm−2, along sightlines with no molecular gas detections in emission. …