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Articles 29791 - 29820 of 39388
Full-Text Articles in Entire DC Network
Analysis Of Transcription Factor Promoter Binding In Rat Hepatoma/Fibroblast Hybrids, Jordan C. Angle
Analysis Of Transcription Factor Promoter Binding In Rat Hepatoma/Fibroblast Hybrids, Jordan C. Angle
Masters Theses
When hepatomas (liver cancer cells) are fused with fibroblasts (undifferentiated body cells), there is complete extinguishing of all tissue-specific gene expression. Once it was discovered that many hybrid cell lines do not express needed transcription factors for liver-specific gene transcription, the factors were reintroduced and forced to express through the use of plasmids. Even if the two primary transcription factors were present in the system, downstream tissue-specific gene expression was not rescued. To examine potential mechanisms for the repression of liver-specific gene expression in hepatoma x fibroblast hybrid cells, chromatin immunoprecipitation (ChlP) was used. This procedure allows the liver-specific gene …
Long-Term Assessment Of Predatory Fish Removal On A Pond-Breeding Amphibian Community In Central Illinois, Lee M. Gross
Long-Term Assessment Of Predatory Fish Removal On A Pond-Breeding Amphibian Community In Central Illinois, Lee M. Gross
Masters Theses
Habitat loss and fragmentation are important contributors to population declines in many species, so maintaining suitable habitat has become a priority for wildlife management. Removal of introduced fish can help restore suitable habitats for amphibian populations, although long-term assessments of such removals are lacking at the community level. In 2001, drift fences and pitfall traps were constructed around the majority of four ponds to monitor an amphibian community in a nature preserve in central Illinois. Rotenone™ was applied to ponds containing introduced fish in 2001, and again, in 2003. I collected data from 2005-2007 to determine the long-term impacts of …
Habitat Selection And Niche Partitioning Of Fox And (Sciurus Niger) And Gray (Sciurus Carolinensis) Squirrels In Charleston, Il, Katelyn Marti
Habitat Selection And Niche Partitioning Of Fox And (Sciurus Niger) And Gray (Sciurus Carolinensis) Squirrels In Charleston, Il, Katelyn Marti
Masters Theses
Two species of tree squirrels inhabit Charleston, IL; fox squirrels (Sciurus niger) and gray squirrels (Sciurus caro/inensis). Although these species are sympatric throughout much of the eastern U.S., urban settings are usually occupied by one or the other. In the few localities where they co-occur, little is known about how they partition habitat. Therefore, the objectives of my study were to determine: (1) the relative abundance of each species, (2) whether habitat use differs between species, (3) if habitat use shifts with season, time of day, domestic predator abundance, or mast availability, and (3) observe interspecific and intraspecific interactions. The …
Survival Strategies Of The Endangered Physaria Ludoviciana (Silvery Bladderpod; Brassicaceae), Marissa Catherine Jernegan Grant
Survival Strategies Of The Endangered Physaria Ludoviciana (Silvery Bladderpod; Brassicaceae), Marissa Catherine Jernegan Grant
Masters Theses
Physaria ludoviciana (Nuttal) O'Kane and Al-Shehbaz is an endangered species in Illinois and Minnesota sand prairies, but has many individual populations in western states. Areas where P. ludoviciana occurs have high summer temperatures, a sandy soil with low water holding capacity and high drainage, the frequent disturbance of blowing sand and little canopy vegetation, giving it a full sun environment. This habitat is where few other plants are able to establish, providing P. ludoviciana with little competition. Physaria ludoviciana exists in a niche where it is adapted and able to establish and persist. The focus of this study was to …
(Mis)Interpreting Mathematical Models: Drift As A Physical Process, Roberta L. Millstein, Robert A. Skipper, Michael Dietrich
(Mis)Interpreting Mathematical Models: Drift As A Physical Process, Roberta L. Millstein, Robert A. Skipper, Michael Dietrich
Dartmouth Scholarship
Recently, a number of philosophers of biology (e.g., Matthen and Ariew 2002; Walsh, Lewens, and Ariew 2002; Pigliucci and Kaplan 2006; Walsh 2007) have endorsed views about random drift that, we will argue, rest on an implicit assumption that the meaning of concepts such as drift can be understood through an examination of the mathematical models in which drift appears. They also seem to implicitly assume that ontological questions about the causality (or lack thereof) of terms appearing in the models can be gleaned from the models alone. We will question these general assumptions by showing how the same equation …
Micrornas And Metazoan Macroevolution: Insights Into Canalization, Complexity, And The Cambrian Explosion, Michael Dietrich, Mark Mcpeek, Kevin J. Peterson
Micrornas And Metazoan Macroevolution: Insights Into Canalization, Complexity, And The Cambrian Explosion, Michael Dietrich, Mark Mcpeek, Kevin J. Peterson
Dartmouth Scholarship
One of the most interesting challenges facing paleobiologists is explaining the Cambrian explosion, the dramatic appearance of most metazoan animal phyla in the Early Cambrian, and the subsequent stability of these body plans over the ensuing 530 million years. We propose that because phenotypic variation decreases through geologic time, because microRNAs (miRNAs) increase genic precision, by turning an imprecise number of mRNA transcripts into a more precise number of protein molecules, and because miRNAs are continuously being added to metazoan genomes through geologic time, miRNAs might be instrumental in the canalization of development. Further, miRNAs ultimately allow for natural selection …
Understanding Plant Community Composition In Agricultural Welands: Context Dependent Effects And Plant Interactions, Elizabeth Boughton
Understanding Plant Community Composition In Agricultural Welands: Context Dependent Effects And Plant Interactions, Elizabeth Boughton
Electronic Theses and Dissertations
Community composition results from an integrated combination of random processes, regional habitat spatial structure, local environmental conditions, and species interactions. For example, the outcome of plant interactions can change depending on local environmental conditions such as nutrient availability, land management, or herbivory intensity. In particular, plant interactions may vary between facilitation and competition depending on ecological context, with facilitation expected to be prevalent under stressful conditions. I present the results of four studies that address different aspects of the community assemblage and dynamics emphasizing the synergistic effect of different processes. In the first, I investigated the importance of habitat isolation …
Landcover Change And Population Dynamics Of Florida Scrub-Jays And Florida Grasshopper Sparrows, David Breininger
Landcover Change And Population Dynamics Of Florida Scrub-Jays And Florida Grasshopper Sparrows, David Breininger
Electronic Theses and Dissertations
I confronted empirical habitat data (1994-2004) and population data (1988-2005) with ecological theory on habitat dynamics, recruitment, survival, and dispersal to develop predictive relationships between landcover variation and population dynamics. I focus on Florida Scrub-Jays, although one chapter presents a model for the potential influence of habitat restoration on viability of the Florida Grasshopper Sparrow. Both species are unique to Florida landscapes that are dominated by shrubs and grasses and maintained by frequent fires. Both species are declining, even in protected areas, despite their protected status. I mapped habitat for both species using grid polygon cells to quantify population potential …
Tissue Engineered Myelination And The Stretch Reflex Arc Sensory Circuit: Defined Medium Formulation, Interface Design And Microfabrication, John Rumsey
Electronic Theses and Dissertations
The overall focus of this research project was to develop an in vitro tissue-engineered system that accurately reproduced the physiology of the sensory elements of the stretch reflex arc as well as engineer the myelination of neurons in the systems. In order to achieve this goal we hypothesized that myelinating culture systems, intrafusal muscle fibers and the sensory circuit of the stretch reflex arc could be bioengineered using serum-free medium formulations, growth substrate interface design and microfabrication technology. The monosynaptic stretch reflex arc is formed by a direct synapse between motoneurons and sensory neurons and is one of the fundamental …
Evidence For Multiple Paternity In Broods Of The Green Lynx Spider Peucetia Viridans (Araneae: Oxyopidae), Martina G. Ramirez
Evidence For Multiple Paternity In Broods Of The Green Lynx Spider Peucetia Viridans (Araneae: Oxyopidae), Martina G. Ramirez
Biology Faculty Works
In the green lynx spider Peucetia viridans (Hentz 1832), the two openings of a mated female’s epigynum are often sealed by copulatory plugs, sometimes with the two-pronged distal portion of the paracybium of a male palpus inserted in each opening and embedded in the plugs. The presence of copulatory plugs and paracymbia may prevent further mating by the female. However, not all mated females exhibit these structures, perhaps allowing some P. viridans females to mate with more than one male, despite the assertion of Whitcomb & Eason (1965) that females only mate once. We investigated this possibility by surveying the …
The Evolution Of Photoperiodic Response Systems And Seasonal Gnrh Plasticity In Birds, Heather E. Watts
The Evolution Of Photoperiodic Response Systems And Seasonal Gnrh Plasticity In Birds, Heather E. Watts
Biology Faculty Works
Animals’ lives are typically subdivided into distinct stages, some of which (e.g. breeding) contribute to fitness through enhancing current reproductive success, and some of which (e.g. molting and migration in birds; hibernation in mammals) contribute to fitness through enhancing survival and, therefore, future reproductive opportunities. There is often a trade-off between these two kinds of processes, either because they are temporally incompatible with one another (e.g. migration precludes simultaneous nesting in birds) or because they are energetically incompatible with one another (e.g. successful molting appears to be incompatible with simultaneous nesting in many birds). Consequently, adaptations facilitating appropriate timing and …
Effects Of Pediatric Adiposity On Heart Rate Variability, Angela K. Lucas
Effects Of Pediatric Adiposity On Heart Rate Variability, Angela K. Lucas
Dissertations, Master's Theses and Master's Reports - Open
The relationship between obesity and heart rate variability (HRV) has been studied in adults and adolescents, but is not determined in young pediatrics. The purpose of this study was to assess autonomic activity using HRV in a pediatric population. We hypothesized that obese children would have reduced parasympathetic and increased sympathetic activity compared to age-matched subjects. 42 pediatric subjects (ages 3-5) were classified into 3 groups based on body mass index-for-age; normal, overweight and obese. HRV and respiratory rate were recorded during 3 minute baseline, 2 minute isometric handgrip and 3 minute recovery. HRV was analyzed in the time domain …
Yeast Telomere Capping Protein Stn1 Overrides Dna Replication Control Through The S Phase Checkpoint, Hovik J. Gasparyan
Yeast Telomere Capping Protein Stn1 Overrides Dna Replication Control Through The S Phase Checkpoint, Hovik J. Gasparyan
Biology Faculty Works
Telomere integrity is maintained through end-protection proteins that block nuclease degradation and prevent telomeres from being recognized as DNA breaks. Although less well understood, end protection proteins may also play a role in facilitating telomere replication. Here, we show that overproduction (OP) of the yeast telomere capping protein Stn1 makes cells highly sensitive to the replication inhibitors hydroxyurea (HU) and methyl-methane sulfonate (MMS). Unexpectedly, this sensitivity corresponds with Stn1 OP blocking most, if not all, aspects of the S phase checkpoint. The checkpoint kinase Rad53 is phosphorylated with normal timing in Stn1 OP cells, indicating Stn1 does not interfere with …
Ten1 Is Essential For Cdc13-Mediated Telomere Capping, Hovik J. Gasparyan
Ten1 Is Essential For Cdc13-Mediated Telomere Capping, Hovik J. Gasparyan
Biology Faculty Works
Telomere binding proteins protect chromosome ends from degradation and mask chromosome termini from checkpoint surveillance. In Saccharomyces cerevisiae, Cdc13 binds single-stranded G-rich telomere repeats, maintaining telomere integrity and length. Two additional proteins, Ten1 and Stn1, interact with Cdc13 but their contributions to telomere integrity are not well defined. Ten1 is known to prevent accumulation of aberrant single-stranded telomere DNA; whether this results from defective end protection or defective telomere replication is unclear. Here we report our analysis of a new group of ten1 temperature-sensitive (ts) mutants. At permissive temperatures, ten1-ts strains display greatly elongated telomeres. After shift to nonpermissive conditions, …
Coywolf, Canis Latrans × Lycaon, Pack Density Doubles Following The Death Of A Resident Territorial Male, Eric Strauss
Coywolf, Canis Latrans × Lycaon, Pack Density Doubles Following The Death Of A Resident Territorial Male, Eric Strauss
Biology Faculty Works
We studied a subset of four radio-collared individuals that were a part of a larger study documenting Coywolf (Canis latrans × lycaon; Eastern Coyote) ecology in an urbanized landscape (Cape Cod, Massachusetts), and report on the territory of a typical sized pack that was subdivided roughly in half following the death of the breeding male from the original (" Centerville") pack. The original residents lived in a winter pack size (i.e., after pup/juvenile dispersal) of three or four individuals in a 19.66 km territory and a density of 0.15-0.20 individuals/km , as determined by radio-tracking and direct observations, with their …
An Algorithm For Identifying Novel Targets Of Transcription Factor Families: Application To Hypoxia-Inducible Factor 1 Targets, Yue Jiang, Bojan Cukic, Donald A. Adjeroh, Heath D. Skinner, Jie Lin, Qingxi J. Shen, Bing-Hua Jiang
An Algorithm For Identifying Novel Targets Of Transcription Factor Families: Application To Hypoxia-Inducible Factor 1 Targets, Yue Jiang, Bojan Cukic, Donald A. Adjeroh, Heath D. Skinner, Jie Lin, Qingxi J. Shen, Bing-Hua Jiang
Electrical & Computer Engineering Faculty Research
Efficient and effective analysis of the growing genomic databases requires the development of adequate computational tools. We introduce a fast method based on the suffix tree data structure for predicting novel targets of hypoxia-inducible factor 1 (HIF-1) from huge genome databases. The suffix tree data structure has two powerful applications here: one is to extract unknown patterns from multiple strings/sequences in linear time; the other is to search multiple strings/sequences using multiple patterns in linear time. Using 15 known HIF-1 target gene sequences as a training set, we extracted 105 common patterns that all occur in the 15 training genes …
The Influence Of Fallback Foods On Great Ape Tooth Enamel, Paul J. Constantino, Peter W. Lucas, James J.-W. Lee, Brian R. Lawn
The Influence Of Fallback Foods On Great Ape Tooth Enamel, Paul J. Constantino, Peter W. Lucas, James J.-W. Lee, Brian R. Lawn
Biological Sciences Faculty Research
Lucas and colleagues recently proposed a model based on fracture and deformation concepts to describe how mammalian tooth enamel may be adapted to the mechanical demands of diet (Lucas et al.: Bioessays 30[2008] 374-385). Here we review the applicability of that model by examining existing data on the food mechanical properties and enamel morphology of great apes (Pan, Pongo, and Gorilla). Particular attention is paid to whether the consumption of fallback foods is likely to play a key role in influencing great ape enamel morphology. Our results suggest that this is indeed the case. We also consider the implications of …
Interactive Effects Of Time, Co2, N, And Diversity On Total Belowground Carbon Allocation And Ecosystem Carbon Storage In A Grassland Community, E. Carol Adair, Peter B. Reich, Sarah E. Hobbie, Johannes M.H. Knops
Interactive Effects Of Time, Co2, N, And Diversity On Total Belowground Carbon Allocation And Ecosystem Carbon Storage In A Grassland Community, E. Carol Adair, Peter B. Reich, Sarah E. Hobbie, Johannes M.H. Knops
School of Biological Sciences: Faculty Publications
Predicting if ecosystems will mitigate or exacerbate rising CO2 requires understanding how elevated CO2 will interact with coincident changes in diversity and nitrogen (N) availability to affect ecosystem carbon (C) storage. Yet achieving such understanding has been hampered by the difficulty of quantifying belowground C pools and fluxes. Thus, we used mass balance calculations to quantify the effects of diversity, CO2, and N on both the total amount of C allocated belowground by plants (total belowground C allocation, TBCA) and ecosystem C storage in a periodically burned, 8-year Minnesota grassland biodiversity, CO2, and N experiment …
A Revision Of The Freshwater Crabs Of Mt. Kenya And The Aberdare Mountains , Neil Cumberlidge
A Revision Of The Freshwater Crabs Of Mt. Kenya And The Aberdare Mountains , Neil Cumberlidge
Journal Articles
No abstract provided.
"A New Species Of Foza Reed & Cumberlidge, 2006, From Northern Madagascar" , Neil Cumberlidge, Kirstin S. Meyer
"A New Species Of Foza Reed & Cumberlidge, 2006, From Northern Madagascar" , Neil Cumberlidge, Kirstin S. Meyer
Journal Articles
No abstract provided.
Freshwater Crabs And The Biodiversity Crisis: Importance, Threats, Status, And Conservation Challenges, Neil Cumberlidge, Peter Kl Ng, Darren Cj Yeo, Celio Magalhães, Martha R. Campos, Fernando Alvarez, Tohru Naruse, Savel R. Daniels, Lara J. Esser, Felix Yk Attipoe, France-Lyse Clotilde-Ba, William Darwall, Anna Mcivor, Jonathan Em Baillie, Ben Collen, Mala Ram
Freshwater Crabs And The Biodiversity Crisis: Importance, Threats, Status, And Conservation Challenges, Neil Cumberlidge, Peter Kl Ng, Darren Cj Yeo, Celio Magalhães, Martha R. Campos, Fernando Alvarez, Tohru Naruse, Savel R. Daniels, Lara J. Esser, Felix Yk Attipoe, France-Lyse Clotilde-Ba, William Darwall, Anna Mcivor, Jonathan Em Baillie, Ben Collen, Mala Ram
Journal Articles
No abstract provided.
"A Revision Of The Freshwater Crabs Of Mt Kenya And The Aberdare Mountains, Kenya, East Africa" , Neil Cumberlidge
"A Revision Of The Freshwater Crabs Of Mt Kenya And The Aberdare Mountains, Kenya, East Africa" , Neil Cumberlidge
Journal Articles
No abstract provided.
How Do Animal Mitochondria Tolerate Water Stress?, Michael Menze, Steven Hand
How Do Animal Mitochondria Tolerate Water Stress?, Michael Menze, Steven Hand
Faculty and Staff Scholarship
The vast majority of animal species do not tolerate severe water stress, but the encysted embryo of the brine shrimp Artemia franciscana is an exceptionally useful organism to investigate physiological mechanisms for enduring extreme environmental insults. Any substantial reduction in cellular water poses a threat to survival. Nevertheless anhydrobiotic animals survive virtually complete loss of cellular water. The mechanisms that govern “life without water” (anhydrobiosis) are still not well understood. With certain exceptions, it seems that a recurring strategy for tolerating severe water loss involves the accumulation of both low molecular weight solutes (e.g. trehalose or other polyol) and highly …
The Effect Of Zinc On L-Leucine Transport In Lobster Intestine, Anna Lynn Mullins
The Effect Of Zinc On L-Leucine Transport In Lobster Intestine, Anna Lynn Mullins
UNF Graduate Theses and Dissertations
The current study is a characterization of L-leucine absorption across the American lobster intestine in order to determine the likelihood of a bis-complex formation with zinc ([Leu]-Zn-[Leu]) as a possible substrate for PEPT1. This study required isolated lobster intestines to be mounted in a perfusion chamber in order to quantify 3H-L-leucine transport. It was hypothesized that an apical dipeptide transporter, PEPT1, was responsible for uptake of L-leucine via formation of a bis-complex with zinc ([Leu]-Zn-[Leu]) in the form of molecular mimicry, where the bis-complex mimics the normal dipeptide substrate of the proposed carrier system. It was found that L-leucine transport …
Hydrologic Control Of Nitrogenremoval, Storage And Export In A Mountain Stream, R. O. Hall Jr., Michelle A. Baker, C. D. Arp, B. J. Koch
Hydrologic Control Of Nitrogenremoval, Storage And Export In A Mountain Stream, R. O. Hall Jr., Michelle A. Baker, C. D. Arp, B. J. Koch
Biology Faculty Publications
Nutrient cycling and export in streams and rivers should vary with flow regime, yet most studies of stream nutrient transformation do not include hydrologic variability. We used a stable isotope tracer of nitrogen (15N) to measure nitrate (NO3-) uptake, storage, and export in a mountain stream, Spring Creek, Idaho, U.S.A. We conducted two tracer tests of 2-week duration during snowmelt and baseflow. Dissolved and particulate forms of 15N were monitored over three seasons to test the hypothesis that stream N cycling would be dominated by export during floods, and storage during low flow. Floods …
Changes In A Tropical Forest Support Metabolic Zero-Sum Dynamics, S.K. Morgan Ernest, Ethan P. White, J. H. Brown
Changes In A Tropical Forest Support Metabolic Zero-Sum Dynamics, S.K. Morgan Ernest, Ethan P. White, J. H. Brown
Biology Faculty Publications
Major shifts in many ecosystem-level properties of tropical forests have been observed, but the processes driving these changes are poorly understood. Over the past two decades, the forest on Barro Colorado Island, Panama (BCI) exhibited a 20% decrease in the number of trees and a 10% increase in average tree diameter. Here we show that these changes are consistent with a zero-sum constraint operating in this forest. Zero-sum constraints result when the total resource use of an ecosystem is limited by available resources. This causes increases in resource use by some groups of organisms to be compensated for by decreases …
Taking Species Abundance Distributions Beyond Individuals, H. Morlon, Ethan P. White, R. S. Etienne, J. L. Green, A. Ostling, D. Alonso, B. J. Enquist, F. He, A. H. Hurlbert, A. E. Magurran, B. A. Maurer, B. J. Mcgill, H. Olff, D. Storch, T. Zillio
Taking Species Abundance Distributions Beyond Individuals, H. Morlon, Ethan P. White, R. S. Etienne, J. L. Green, A. Ostling, D. Alonso, B. J. Enquist, F. He, A. H. Hurlbert, A. E. Magurran, B. A. Maurer, B. J. Mcgill, H. Olff, D. Storch, T. Zillio
Biology Faculty Publications
The species abundance distribution is one of the few “universal” patterns in ecology. Research on this fundamental distribution has been focused to the study of numerical counts, irrespective of the traits of individuals. Here we show that considering a set of Generalized Species Abundance Distributions (GSADs) that encompass several abundance measures, specifically numerical abundance, biomass and resource use can provide novel insights into organizational forces at play in ecological communities. We first leverage a comprehensive dataset to investigate the similarity and difference between GSADs. We then use classical probability theory and allometric scaling laws to explore theoretical linkages among GSADs …
Long-Term Monitoring And Experimentalmanipulation Of A Chihuahuan Desert Ecosystem Near Portal, Arizona, Usa, S.K. Morgan Ernest, T. J. Valone, J. H. Brown
Long-Term Monitoring And Experimentalmanipulation Of A Chihuahuan Desert Ecosystem Near Portal, Arizona, Usa, S.K. Morgan Ernest, T. J. Valone, J. H. Brown
Biology Faculty Publications
Desert ecosystems have long served as model systems in the study of ecological concepts (e.g., competition, resource pulses, top-down/bottom-up dynamics). However, the inherent variability of resource availability in deserts, and hence consumer dynamics, can also make them challenging ecosystems to understand. Study of a Chihuahuan desert ecosystem near Portal, Arizona, USA, began in 1977. At this site, 24 experimental plots were established in 1977 and divided among controls and experimental manipulations. Experimental manipulations over the years include removal of all or some rodent species, all or some ants, seed additions, and various alterations of the annual plant community. While some …
Selective Herbivory By The Woodrat (Neotoma Lepida) On Joshua Trees (Yucca Brevifolia), M P. Stanford, Nancy J. Huntly
Selective Herbivory By The Woodrat (Neotoma Lepida) On Joshua Trees (Yucca Brevifolia), M P. Stanford, Nancy J. Huntly
Biology Faculty Publications
We studied herbivory by the desert woodrat (Neotoma lepida) on Joshua trees (Yucca brevifolia) in the Mojave Desert to determine whether N. lepida fed selectively based on leaf nitrogen content. We measured leaf nitrogen content and the location and amount of herbivory by woodrats on Y. brevifolia trees in southwestern Utah, USA. Neotoma lepida removed the outer tips of leaves (1/3 to 2/3 of total leaf length) but left leaf bases, which had lower nitrogen content, uneaten. Herbivory by N. lepida also was concentrated on rosettes that were oriented south, and these had significantly higher nitrogen content than rosettes that …
An Introduction To The Biocomplexity Of Sanak Island, Western Gulf Alaska, Hd G. Maschner, M Betts, J Cornell, B Finney, J A. Dunne, Nancy J. Huntly, J W. Jordan, N Misarti, K L. Reedy-Maschner, R Russell
An Introduction To The Biocomplexity Of Sanak Island, Western Gulf Alaska, Hd G. Maschner, M Betts, J Cornell, B Finney, J A. Dunne, Nancy J. Huntly, J W. Jordan, N Misarti, K L. Reedy-Maschner, R Russell
Biology Faculty Publications
The Sanak Biocomplexity Project is a transdisciplinary research effort focused on a small island archipelago 50 km south of the Alaska Peninsula in the western Gulf of Alaska. This team of archaeologists, terrestrial ecologists, social anthropologists, intertidal ecologists, geologists, oceanographers, paleoecologists, and modelers is seeking to understanding the role of the ancient, historic, and modern Aleut in the structure and functioning of local and regional ecosystems. Using techniques ranging from systematic surveys to stable isotope chemistry, long-term shifts in social dynamics and ecosystem structure are present in the context of changing climatic regimes and human impacts. This paper presents a …