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Subarctic Crustose Coralline Algae As Recorders Of Past Climatic And Environmental Change
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Book Synopsis Subarctic Crustose Coralline Algae as Recorders of Past Climatic and Environmental Change by : Phoebe Tsz-Wai Chan
Download or read book Subarctic Crustose Coralline Algae as Recorders of Past Climatic and Environmental Change written by Phoebe Tsz-Wai Chan and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: If unabated, the continued anthropogenic release of carbon dioxide is expected to lead to warming and acidification of ocean waters, with widespread and detrimental impacts on marine ecosystems. Proxy records stored in biomineralized shells and skeletons of long-lived paleoclimate archives are essential for understanding long-term climate variability - previously unresolvable based on spatiotemporally limited observations. In this dissertation, geochemical and physical proxies from Clathromorphum spp. crustose coralline algae (CCA) are used for interpreting past climatic and environmental changes in the subarctic North Pacific and North Atlantic Oceans. Micro-computed tomography techniques are used to examine the algal skeleton, and reveal changes in skeletal density in relation to recently observed acidification off the Aleutian Islands, Alaska. Metabolic trade-offs associated with continued growth and calcification in acidifying seawaters may have resulted in the production of weaker (less-dense) skeletons since 1980. However, correlations indicate that in addition to acidification, sunlight availability and temperature stress are also important factors influencing the ability of CCA to calcify. Furthermore, barium-to-calcium (Ba/Ca) ratios are utilized as proxies for phytoplankton productivity in northern Labrador, Canada, such that: Higher (lower) algal Ba/Ca values are interpreted as decreased (increased) productivity coinciding with the expansion (melting) of sea-ice. This multi-centennial record of algal Ba/Ca indicates a long-term increase in North Atlantic productivity that is unprecedented in the last 365 years. Conversely, in mountainous coastal regions surrounding the Gulf of Alaska where high sediment loads are present in seasonal runoff, algal Ba/Ca is used as an indicator for freshwater runoff. Ba/Ca is inversely correlated to instrumental salinity, and indicates a unique period of freshening (2001 â 2006) that is related to increasing glacial melt and precipitation on mainland Alaska. The results presented here illustrate the physiological responses of coralline algae to acidification, and provides much-needed data for future projections of climate and environmental change.
Book Synopsis Coralline Algae: Past, Present, and Future Perspectives by : Laurie Carol Hofmann
Download or read book Coralline Algae: Past, Present, and Future Perspectives written by Laurie Carol Hofmann and published by Frontiers Media SA. This book was released on 2022-12-28 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coral Reefs and Climate Change by : Jonathan Turnbull Phinney
Download or read book Coral Reefs and Climate Change written by Jonathan Turnbull Phinney and published by American Geophysical Union. This book was released on 2006-01-10 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Coastal and Estuarine Studies, Volume 61. The effects of increased atmospheric carbon dioxide and related climate change on shallow coral reefs are gaining considerable attention for scientific and economic reasons worldwide. Although increased scientific research has improved our understanding of the response of coral reefs to climate change, we still lack key information that can help guide reef management. Research and monitoring of coral reef ecosystems over the past few decades have documented two major threats related to increasing concentrations of atmospheric CO2: (1) increased sea surface temperatures and (2) increased seawater acidity (lower pH). Higher atmospheric CO2 levels have resulted in rising sea surface temperatures and proven to be an acute threat to corals and other reef-dwelling organisms. Short periods (days) of elevated sea surface temperatures by as little as 1–2°C above the normal maximum temperature has led to more frequent and more widespread episodes of coral bleaching-the expulsion of symbiotic algae. A more chronic consequence of increasing atmospheric CO2 is the lowering of pH of surface waters, which affects the rate at which corals and other reef organisms secrete and build their calcium carbonate skeletons. Average pH of the surface ocean has already decreased by an estimated 0.1 unit since preindustrial times, and will continue to decline in concert with rising atmospheric CO2. These climate-related Stressors combined with other direct anthropogenic assaults, such as overfishing and pollution, weaken reef organisms and increase their susceptibility to disease.
Book Synopsis Rhodolith/Maërl Beds: A Global Perspective by : Rafael Riosmena-Rodríguez
Download or read book Rhodolith/Maërl Beds: A Global Perspective written by Rafael Riosmena-Rodríguez and published by Springer. This book was released on 2016-10-07 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rhodolith beds are recognized internationally as a unique ecosystem, and they are the focus of this interdisciplinary book. These marine beds occur worldwide, from the tropics to the poles, ranging in depth from intertidal to deep subtidal habitats and they are also represented in extensive fossil deposits. In the light of international interest in rhodoliths and maerl concerning their role in coastal ecosystems and with respect to biodiversity, fisheries, and the production of sediment, this book provides the most comprehensive view possible. As readers will discover, rhodoliths/maerl are fundamental to a range of ecological processes, acting as ecosystem engineers including playing key roles in recruitment and providing nursery habitats. Rhodoliths/maerl have been used commercially in some parts of the world, and they are understood to be vulnerable to coastal modifications and human-induced change, and hence their status may serve as an indicator of ecosystem health. Rhodoliths/maerl contribute to global carbon budgets although the extent remains to be evaluated, as do the potential impacts of changing global climates and ocean acidification.
Book Synopsis Coralline Algae: Globally Distributed Ecosystem Engineers by : Laurie Carol Hofmann
Download or read book Coralline Algae: Globally Distributed Ecosystem Engineers written by Laurie Carol Hofmann and published by Frontiers Media SA. This book was released on 2020-07-08 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Red Coralline Algae and Climate Change by : Maren Isabelle Pauly
Download or read book Red Coralline Algae and Climate Change written by Maren Isabelle Pauly and published by . This book was released on 2015 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Past ocean acidification recorded in the geological record facilitates the understanding of rates and influences of contemporary pCO2 enrichment. High resolution proxies of pCO2 and pH can be used to reconstruct components of the palaeocarbonate system. At present, most pH reconstructions are made using boron isotopes, however, there is some uncertainty associated with vital effects and isotopic fractionation. In addition to contemporary ocean acidification, marine organisms currently experience thermal stress associated with increasing atmospheric temperatures. Here we present a study of the influences of multiple stressors on the growth and structure of a marine carbonate, predicted to occur within this century, and a novel structural proxy for carbonate chemistry; Mg-O bond strength in coralline algae. Free living Lithothamnion glaciale algae were incubated in control (380ppm pCO2), moderate acidification (750ppm pCO2) and high acidification (1000ppm pCO2) at ambient and enhanced (+2°C) temperature conditions for 24 months. Coralline algae growth (linear extension) was highly dependent on temperature, with +2°C samples experiencing significantly reduced growth. No significant correlation was found between pCO2 and growth, indicating L. glaciale's ability to acclimatize. Relative magnesium concentration and Mg-O bond strength within the high-Mg skeleton cyclically over an annual cycle. For all seasons there was a positive linear relationship between pCO2 concentration and bond strength mediated by positional disorder of the calcite lattice. Structural preservation of the carbonate chemistry system in coralline algal high Mg calcite represents an alternative approach to reconstructing marine carbonate chemistry parameters based on skeletal structure rather than chemistry.
Book Synopsis The Effects of Light, Temperature, and Ocean Acidification on the Physiology and Ecology of Tropical Crustose Coralline Algae by : Amy A. Briggs
Download or read book The Effects of Light, Temperature, and Ocean Acidification on the Physiology and Ecology of Tropical Crustose Coralline Algae written by Amy A. Briggs and published by . This book was released on 2016 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crustose coralline red algae frameworks and rhodoliths: Past and present by : Ana Cristina Rebelo
Download or read book Crustose coralline red algae frameworks and rhodoliths: Past and present written by Ana Cristina Rebelo and published by Frontiers Media SA. This book was released on 2023-01-03 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ocean Acidification by : National Research Council
Download or read book Ocean Acidification written by National Research Council and published by National Academies Press. This book was released on 2010-09-14 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ocean has absorbed a significant portion of all human-made carbon dioxide emissions. This benefits human society by moderating the rate of climate change, but also causes unprecedented changes to ocean chemistry. Carbon dioxide taken up by the ocean decreases the pH of the water and leads to a suite of chemical changes collectively known as ocean acidification. The long term consequences of ocean acidification are not known, but are expected to result in changes to many ecosystems and the services they provide to society. Ocean Acidification: A National Strategy to Meet the Challenges of a Changing Ocean reviews the current state of knowledge, explores gaps in understanding, and identifies several key findings. Like climate change, ocean acidification is a growing global problem that will intensify with continued CO2 emissions and has the potential to change marine ecosystems and affect benefits to society. The federal government has taken positive initial steps by developing a national ocean acidification program, but more information is needed to fully understand and address the threat that ocean acidification may pose to marine ecosystems and the services they provide. In addition, a global observation network of chemical and biological sensors is needed to monitor changes in ocean conditions attributable to acidification.
Book Synopsis Coral Reefs and Sea-level Change by :
Download or read book Coral Reefs and Sea-level Change written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Coralline Genus Clathromorphum Foslie Emend Adey by : Walter H. Adey
Download or read book The Coralline Genus Clathromorphum Foslie Emend Adey written by Walter H. Adey and published by . This book was released on 2013 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seaweed Phylogeography by : Zi-Min Hu
Download or read book Seaweed Phylogeography written by Zi-Min Hu and published by Springer. This book was released on 2016-01-04 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides an overview of research on the remarkable diversity, adaptive genetic differentiation, and evolutionary complexity of intertidal macroalgae species. Through incorporating molecular data, ecological niche and model-based phylogeographic inference, this book presents the latest findings and hypotheses on the spatial distribution and evolution of seaweeds in the context of historical climate change (e.g. the Quaternary ice ages), contemporary global warming, and increased anthropogenic influences. The chapters in this book highlight past and current research on seaweed phylogeography and predict the future trends and directions. This book frames a number of research cases to review how biogeographic processes and interactive eco-genetic dynamics shaped the demographic histories of seaweeds, which furthermore enhances our understanding of speciation and diversification in the sea. Dr. Zi-Min Hu is an associate professor at Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China. Dr. Ceridwen Fraser is a senior lecturer at Fenner School of Environment and Society, Australian National University, Canberra, Australia.
Book Synopsis Will Coralline Algae Reef Mitigate Climate Change Effects on Associated Fauna? by :
Download or read book Will Coralline Algae Reef Mitigate Climate Change Effects on Associated Fauna? written by and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Climate Change, Ocean Acidification and Sponges by : José Luis Carballo
Download or read book Climate Change, Ocean Acidification and Sponges written by José Luis Carballo and published by Springer. This book was released on 2017-10-27 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: While sponges represent a very simple group of organisms, which are represented by over 8000 species, there is considerable interest in the increasing role they may play in future marine ecosystems. While we still have a comparatively limited understanding of how sponges will respond to ocean warming and acidification there is evidence that some species may have the ability to acclimate or even adapt to these stressors. This comprehensive collection of articles describes our current understanding of the impacts of ocean acidification and warming on sponges across multiple levels of biological organisation, and from the geological past to the present. With expert contributions from across the world this book represents the most up-to-date view on sponge responses to climate change. This book will be of interest to a wide audience of marine scientists and managers, who are grappling with how to manage, conserve and protect marine ecosystems.
Book Synopsis Interactions in the Marine Benthos by : Stephen J. Hawkins
Download or read book Interactions in the Marine Benthos written by Stephen J. Hawkins and published by Cambridge University Press. This book was released on 2019-08-29 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive account of how abiotic and biotic interactions shape patterns of coastal marine biodiversity and ecosystem processes globally.
Book Synopsis Freshwater Algae by : Edward G. Bellinger
Download or read book Freshwater Algae written by Edward G. Bellinger and published by John Wiley & Sons. This book was released on 2011-09-20 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater Algae: Identification and Use as Bioindicators provides a comprehensive guide to temperate freshwater algae, with additional information on key species in relation to environmental characteristics and implications for aquatic management. The book uniquely combines practical material on techniques and water quality management with basic algal taxonomy and the role of algae as bioindicators. Freshwater Algae: Identification and Use as Bioindicators is divided into two parts. Part I describes techniques for the sampling, measuring and observation of algae and then looks at the role of algae as bioindicators and the implications for aquatic management. Part II provides the identification of major genera and 250 important species. Well illustrated with numerous original illustrations and photographs, this reference work is essential reading for all practitioners and researchers concerned with assessing and managing the aquatic environment.
Book Synopsis Managing Ocean Environments in a Changing Climate by : Kevin J. Noone
Download or read book Managing Ocean Environments in a Changing Climate written by Kevin J. Noone and published by Newnes. This book was released on 2013-06-29 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Managing Ocean Environments in a Changing Climate summarizes the current state of several threats to the global oceans. What distinguishes this book most from previous works is that this book begins with a holistic, global-scale focus for the first several chapters and then provides an example of how this approach can be applied on a regional scale, for the Pacific region. Previous works usually have compiled local studies, which are essentially impossible to properly integrate to the global scale. The editors have engaged leading scientists in a number of areas, such as fisheries and marine ecosystems, ocean chemistry, marine biogeochemical cycling, oceans and climate change, and economics, to examine the threats to the oceans both individually and collectively, provide gross estimates of the economic and societal impacts of these threats, and deliver high-level recommendations. Nominated for a Katerva Award in 2012 in the Economy category State of the science reviews by known marine experts provide a concise, readable presentation written at a level for managers and students Links environmental and economic aspects of ocean threats and provides an economic analysis of action versus inaction Provides recommendations for stakeholders to help stimulate the development of policies that would help move toward sustainable use of marine resources and services
