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  • 1
    Call number: 9783319302591 (e-book)
    Description / Table of Contents: This book highlights perspectives, insights, and data in the coupled fields of aquatic microbial ecology and biogeochemistry when viewed through the lens of collaborative duos - dual career couples. Their synergy and collaborative interactions have contributed substantially to our contemporary understanding of pattern, process and dynamics. This is thus a book by dual career couples about dual scientific processes. The papers herein represent wide-ranging topics, from the processes that structure microbial diversity to nitrogen and photosynthesis metabolism, to dynamics of changing ecosystems and processes and dynamics in individual ecosystems. In all, these papers take us from the Arctic to Africa, from the Arabian Sea to Australia, from small lakes in Maine and Yellowstone hot vents to the Sargasso Sea, and in the process provide analyses that make us think about the structure and function of all of these systems in the aquatic realm. This book is useful not only for the depth and breadth of knowledge conveyed in its chapters, but serves to guide dual career couples faced with the great challenges only they face. Great teams do make great science
    Type of Medium: 12
    Pages: 1 Online-Ressource (xvii, 300 Seiten) , Diagremma, Karten
    ISBN: 9783319302591 , 978-3-319-30259-1
    Language: English
    Note: Contents Part I Unraveling Microbial Diversity and Their Processes Phagotrophic Protists: Central Roles in Microbial Food Webs / Evelyn B. Sherr and Barry F. Sherr Overview Protists as Elemental Recyclers Protists as Consumers of Bacteria Protists as Consumers of Phytoplankton Protists in High Latitude Food Webs Looking to the Future References Drivers That Structure Biodiversity in the Plankton / Tatiana A. Rynearson and Susanne Menden-Deuer Plankton Biodiversity Alternate Hypotheses That Explain the Paradox of the Plankton An Organismal Perspective on the Paradox of the Plankton: A Biodiversity Explosion from Within? Linking Individual Level Behaviors with Plankton Ecology Pervasive Intra-specific Variability in the Genetic Diversity, Physiological Capacity, and Behavioral Repertoire of Plankton Evolution: Generating and Structuring Diversity over the Long Term Opportunities for Progress References The Elongated, the Squat and the Spherical: Selective Pressures for Phytoplankton Shape / Lee Karp-Boss and Emmanuel Boss Introduction Effects of Shape on Diffusion Other Selective Pressures References Crossing the Freshwater/Saline Barrier: A Phylogenetic Analysis of Bacteria Inhabiting Both Freshwater and Marine Ecosystems / Mina Bižić-Ionescu and Danny Ionescu Introduction Recent Data on Shared Taxa Synthesis of Published Sequence Data Future Perspectives References Approaches and Challenges for Linking Marine Biogeochemical Models with the “Omics” Revolution / Victoria J. Coles and Raleigh R. Hood Introduction Bridging the Cultural and Structural Divide Relating Existing Omics to Current Biogeochemical Models Near-Term Innovation Conclusions References Part II Viewing Growth and Trophodynamics Through a Stoichiometric Lens Out of Africa and into Stoichiometry / Susan S. Kilham and Peter Kilham References Exploring the Implications of the Stoichiometric Modulation of Planktonic Predation / Aditee Mitra and Kevin J. Flynn Introduction Characterising the Predator–Prey Stoichiometric Link Elemental Stoichiometry and Commercial Microalgal Production Effects of Temperature, Ocean Acidification and Nutrient Excess Avoiding Predation Stoichiometry and Mixotrophy Conclusions References . Part III Understanding the Mysteries of Light and Nitrogen On Saturating Response Curves from the Dual Perspectives of Photosynthesis and Nitrogen Metabolism / Todd M. Kana and Patricia M. Glibert Introduction Static vs. Dynamic Behavior Gradient Signals and Dynamics of Response Curves Overall Perspective on Dynamic Kinetics References Nitrate Reductase: A Nexus of Disciplines, Organisms, and Metabolism / Erica B. Young and John A. Berges Introduction Why Nitrate Reductase? Understanding That Has Emerged from Recent NR Measurements Recent Advances and Emerging Challenges Conclusion References The Ammonium Paradox of an Urban High- Nutrient Low-Growth Estuary / Frances Wilkerson and Richard Dugdale High-Nutrient Low-Growth Estuaries and Oligotrophication Observation of an Ammonium Paradox Ammonium: The Gatekeeper Controlling Access to Nitrate References Why Is Planktonic Nitrogen Fixation So Rare in Coastal Marine Ecosystems? Insights from a Cross-Systems Approach / Roxanne Marino and Robert W. Howarth References Where Light and Nutrients Collide: The Global Distribution and Activity of Subsurface Chlorophyll Maximum Layers / Greg M. Silsbe and Sairah Y. Malkin At the Confluence of Light and Nutrients Distribution of Marine SCMLs Phytoplankton Production in SCMLs Subsurface Chlorophyll Maximum Layers in Lakes References Part IV Looking in the Rear View Mirror: The Long View on Changing Ecosystems An Ecosystem in Transition: The Emergence of Mixotrophy in the Arabian Sea / Joaquim I. Goes and Helga do R. Gomes Introduction Materials and Methods Results and Discussion References The Saint Lawrence Island Polynya: A 25-Year Evaluation of an Analogue for Climate Change in Polar Regions / Jacqueline M. Grebmeier and Lee W. Cooper Introduction Synthesis Results and Discussion The Northern Bering Sea: Interannual Variability and Change Benthivores Overall Summary References Ecological Processes and Nutrient Transfers from Land to Sea: A 25-Year Perspective on Research and Management of the Seine River System / Josette Garnier and Gilles Billen Introduction 1850–1990: Organic Pollution and Oxygen 1990–2000: Eutrophication and Algal Bloom 2000–2015: Agricultural Pollution and Nitrate Contamination Conclusion: From Microbial Ecology to Territorial Biogeochemistry References A Historical Perspective on Eutrophication in the Pensacola Bay Estuary, FL, USA / Jane M. Caffrey and Michael C. Murrell Introduction Pensacola Bay Physical Setting Human Colonization of Pensacola Bay River and Estuarine Water Quality Controls on Primary Production, Organic Matter, and Nutrient Cycling Summary References Unpublished Reports Websites Meeting in the Middle: On the Interactions Between Microalgae and Their Predators or Zooplankton and Their Food / Karen H. Wiltshire and Maarten Boersma Introduction Materials and Methods Results Discussion References Lake Transparency: A Window into Decadal Variations in Dissolved Organic Carbon Concentrations in Lakes of Acadia National Park, Maine / Collin Roesler and Charles Culbertson Introduction Methods Results Discussion References Part V Focusing on Unique Systems, Processes and Dynamics Phytoplankton Biodiversity in the Oligotrophic Northwestern Sargasso Sea / James L. Pinckney and Tammi L. Richardson Introduction Materials and Methods Results Discussion References Biological Oceanography of the Gulf of Carpentaria, Australia: A Review / Peter C. Rothlisberg and Michele A. Burford Introduction Study Area Currents and Hydrography Phytoplankton and the Role of Nutrients Zooplankton Penaeid Prawn Larval Ecology Larval Dispersal Mechanisms Summary Points References Discerning the Causes of Toxic Cyanobacteria (Lyngbya majuscula) Blooms in Moreton Bay, Australia / Judith M. O’Neil and William C. Dennison Introduction Nutrient Interactions Light Interactions Conceptual Model Broader Significance References Copepod, Ctenophore, and Schyphomedusae Control in Structuring the Chesapeake Bay Summer Mesohaline Planktonic Food Web / Kevin G. Sellner and Stella G. Sellner Introduction Methods Results and Discussion References Microbiogeochemical Ecophysiology of Freshwater Hydrothermal Vents in Mary Bay Canyon, Yellowstone Lake, Yellowstone National Park WY / Carmen Aguilar and Russell Cuhel Introduction Methods Big Picture Outcomes Closing Remarks References Index
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  • 2
    Publication Date: 2022-05-26
    Description: From 1967 to 1984 the Matamek Research Station, located near Sept-Iles, Quebec, was the focus of a research program on salmonid production in boreal river ecosystems. Research was conducted under the auspices of Woods Hole Oceanographic Institution and in cooperation with the Ministere du Loisir, de la Chasse et de la Peche du Quebec and representatives of several universities in Canada and the United States. One of the central activities throughout the history of the Station was monitoring of Atlantic salmon (Salmo salar) in the Matamek River. All salmon life history stages were involved, although the greatest effort was spent in estimates of parr population size at select sites and in estimates of population size, age and sex ratios of sea-run adults entering the river to spawn. Effort and methods were not consistent from year to year due to changes in program focus and improvements in techniques. Nonetheless, we believe the data represent the only long-term record for an Atlantic salmon population on the North Shore of the St. Lawrence. Heretofore, information on Atlantic salmon from the Matamek River was available only in published works or in the Matamek Annual Reports published by Woods Hole Oceanographic Institution. Because of the potential value for analyses of salmon population dynamics and life history, we have assembled the raw data, with neither analysis nor interpretation, in this report. During the period of 1980-1984, considerable effort was exerted in collecting data from original sources (field notebooks, scale envelopes, etc.) and in correcting errors in the data. We cannot, of course, guarantee complete accuracy. Nonetheless, this collection of information is the most complete and accurate compilation possible at this time. The data are presented as records for individual fish, and are ordered by date and by life history stage. We include a key to the designations of columns and to conventions used in coding data. All entries are raw data as initially recorded and coded; no analyses are available beyond those used by various individual authors in their preparation of reports or publications. While these data are made available for general use through this compilation, we request that proper acknowledgment be given the Matamek Research Program of Woods Hole Oceanographic Institution, under whose directorship this compilation was accomplished.
    Description: Funding was provided by the Department of Commerce, NOAA National Sea Grant College Program under contract Number NABO-AA-D-00077.
    Keywords: Atlantic salmon ; Fish populations
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 3
    Publication Date: 2019-03-18
    Description: The development of complex cognitive functions during human evolution coincides with pronounced encephalization and expansion of white matter, the brain’s infrastructure for region-to-region communication. We investigated adaptations of the human macroscale brain network by comparing human brain wiring with that of the chimpanzee, one of our closest living primate relatives. White matter connectivity networks were reconstructed using diffusion-weighted MRI in humans (n= 57) and chimpanzees (n= 20) and then analyzed using network neuroscience tools. We demonstrate higher network centrality of connections linking multimodal association areas in humans compared with chimpanzees, together with a more pronounced modular topology of the human connectome. Furthermore, connections observed in humans but not in chimpanzees particularly link multimodal areas of the temporal, lateral parietal, and inferior frontal cortices, including tracts important for language processing. Network analysis demonstrates a particularly high contribution of these connections to global network integration in the human brain. Taken together, our comparative connectome findings suggest an evolutionary shift in the human brain toward investment of neural resources in multimodal connectivity facilitating neural integration, combined with an increase in language-related connectivity supporting functional specialization.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 4
    Publication Date: 2018-05-08
    Description: Humans have the largest cerebral cortex among primates. The question of whether association cortex, particularly prefrontal cortex (PFC), is disproportionately larger in humans compared with nonhuman primates is controversial: Some studies report that human PFC is relatively larger, whereas others report a more uniform PFC scaling. We address this controversy using MRI-derived cortical surfaces of many individual humans, chimpanzees, and macaques. We present two parcellation-based PFC delineations based on cytoarchitecture and function and show that a previously used morphological surrogate (cortex anterior to the genu of the corpus callosum) substantially underestimates PFC extent, especially in humans. We find that the proportion of cortical gray matter occupied by PFC in humans is up to 1.9-fold greater than in macaques and 1.2-fold greater than in chimpanzees. The disparity is even more prominent for the proportion of subcortical white matter underlying the PFC, which is 2.4-fold greater in humans than in macaques and 1.7-fold greater than in chimpanzees.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 5
    Publication Date: 2017-12-28
    Description: Predicting how species’ abundances and ranges will shift in response to climate change requires a mechanistic understanding of how multiple factors interact to limit population growth. Both abiotic stress and species interactions can limit populations and potentially set range boundaries, but we have a poor understanding of when and where each is most critical. A commonly cited hypothesis, first proposed by Darwin, posits that abiotic factors (e.g., temperature, precipitation) are stronger determinants of range boundaries in apparently abiotically stressful areas (“stress” indicates abiotic factors that reduce population growth), including desert, polar, or high-elevation environments, whereas species interactions (e.g., herbivory, competition) play a stronger role in apparently less stressful environments. We tested a core tenet of this hypothesis—that population growth rate is more strongly affected by species interactions in less stressful areas—using experimental manipulations of species interactions affecting a common herbaceous plant, Hibiscus meyeri (Malvaceae), across an aridity gradient in a semiarid African savanna. Population growth was more strongly affected by four distinct species interactions (competition with herbaceous and shrubby neighbors, herbivory, and pollination) in less stressful mesic areas than in more stressful arid sites. However, contrary to common assumptions, this effect did not arise because of greater density or diversity of interacting species in less stressful areas, but rather because aridity reduced sensitivity of population growth to these interactions. Our work supports classic predictions about the relative strength of factors regulating population growth across stress gradients, but suggests that this pattern results from a previously unappreciated mechanism that may apply to many species worldwide.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 6
    Publication Date: 2019-11-11
    Description: Recent discussions of human brain evolution have largely focused on increased neuron numbers and changes in their connectivity and expression. However, it is increasingly appreciated that oligodendrocytes play important roles in cognitive function and disease. Whether both cell types follow similar or distinctive evolutionary trajectories is not known. We examined the transcriptomes of neurons and oligodendrocytes in the frontal cortex of humans, chimpanzees, and rhesus macaques. We identified human-specific trajectories of gene expression in neurons and oligodendrocytes and show that both cell types exhibit human-specific up-regulation. Moreover, oligodendrocytes have undergone more pronounced accelerated gene expression evolution in the human lineage compared to neurons. We highlighted human-specific coexpression networks with specific functions. Our data suggest that oligodendrocyte human-specific networks are enriched for alternative splicing and transcriptional regulation. Oligodendrocyte networks are also enriched for variants associated with schizophrenia and other neuropsychiatric disorders. Such enrichments were not found in neuronal networks. These results offer a glimpse into the molecular mechanisms of oligodendrocytes during evolution and how such mechanisms are associated with neuropsychiatric disorders.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 7
    Publication Date: 2017-02-09
    Electronic ISSN: 2469-990X
    Topics: Physics
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  • 8
    Publication Date: 2019-06-06
    Electronic ISSN: 2469-990X
    Topics: Physics
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  • 9
    Publication Date: 2019-08-01
    Description: Bark beetles in the family Curculionidae present a growing hazard to forests worldwide. Like native bark beetles, introduced exotic species can pose a serious threat to North American forests. Ips typographus (Boerner) and Ips sexdentatus (Linnaeus), both native to Europe, are two such pests that have caused widespread forest loss in their native ranges. International trade has led to increased interceptions of Scolytine beetles at ports of entry to the United States. Most intercepted individuals are not identified to species due to lack of expert identifiers, poor specimen quality, or incomplete taxonomy. These same problems affect identification for domestic surveys. Therefore, development of molecular methods for identification of potentially invasive Ips species is essential. Because of the need to scrutinize large numbers of beetles in an efficient manner, we describe a duplex droplet digital PCR (ddPCR) assay to identify I. typographus and I. sexdentatus simultaneously in bulk trap samples containing 500 Scolytinae specimens using a scalable, two-step DNA extraction. This ddPCR method is highly effective for processing the entire contents of beetle traps and identifying these potentially invasive species in a timely and definitive manner. We also describe a nondestructive DNA extraction technique that preserves specimens for morphological identification.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 10
    Publication Date: 2017-09-01
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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