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  Eastern Pacific Coral Reef Provinces, Coral Community Structure and Composition: An Overview

  Juan J. Alvarado, Stuart Banks, Jorge Cortes, Joshua Feingold, Carlos Jimenez, James E. Maragos, Priscilla Martinez, Juan L. Mate, Diana A. Moanga, Sergio Navarrete, Hector Reyes-Bonilla, Bernhard Riegl, Fernando Rivera, Bernardo Vargas-Angel, Evie A. Wieters, and Fernando A. Zapata

  Advances in our knowledge of eastern tropical Pacific (ETP) coral reef biogeography and ecology during the past two decades are briefly reviewed. Fifteen ETP subregions are recognized, including mainland and island localities from the Gulf of California (Mexico) to Rapa Nui (Easter Island, Chile). Updated species lists reveal a mean increase of 4.2 new species records per locality or an overall increase of 19.2 % in species richness during the past decade. The largest increases occurred in tropical mainland Mexico, and in equatorial Costa Rica and Colombia, due mainly to continuing surveys of these under-studied areas. Newly discovered coral communities are also now known from the southern Nicaraguan coastline. To date 47 zooxanthellate scleractinian species have been recorded in the ETP, of which 33 also occur in the central/south Pacific, and 8 are presumed to be ETP endemics. Usually no more than 20–25 zooxanthellate coral species are present at any given locality, with the principal reef-building genera being Pocillopora, Porites, Pavona, and Gardineroseris. This compares with 62–163 species at four of the nearest central/south Pacific localities. Hydrocorals in the genus Millepora also occur in the ETP and are reviewed in the context of their global distributions. Coral community associates engaged in corallivory, bioerosion, and competition for space are noted for several localities. Reef framework construction in the ETP typically occurs at shallow depths (2–8 m) in sheltered habitats or at greater depths (10–30 m) in more exposed areas such as oceanic island settings with high water column light penetration. Generally, eastern Pacific reefs do not reach sea level with the development of drying reef flats, and instead experience brief periods of exposure during extreme low tides or drops in sea level during La Niña events. High rates of mortality during El Niño disturbances have occurred in many ETP equatorial areas, especially in Panama and the Galápagos Islands during the 1980s and 1990s. Remarkably, however, no loss of resident, zooxanthellate scleractinian species has occurred at these sites, and many ETP coral reefs have demonstrated significant recovery from these disturbances during the past two decades.

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  Mapping and Quantifying Seascape Patterns

  Bryan Costa, Brian K. Walker, and Jennifer Dijkstra

  Seascape Ecology provides a comprehensive look at the state-of-the-science in the application of landscape ecology to the seas and provides guidance for future research priorities. The first book devoted exclusively to this rapidly emerging and increasingly important discipline, it is comprised of contributions from researchers at the forefront of seascape ecology working around the world. It presents the principles, concepts, methodology, and techniques informing seascape ecology and reports on the latest developments in the application of the approach to marine ecology and management.

  A growing number of marine scientists, geographers, and marine managers are asking questions about the marine environment that are best addressed with a landscape ecology perspective. Seascape Ecology represents the first serious effort to fill the gap in the literature on the subject. Key topics and features of interest include:

  • The origins and history of seascape ecology and various approaches to spatial patterning in the sea
  • The links between seascape patterns and ecological processes, with special attention paid to the roles played by seagrasses and salt marshes and animal movements through seascapes
  • Human influences on seascape ecology—includes models for assessing human-seascape interactions
  • A special epilogue in which three eminent scientists who have been instrumental in shaping the course of landscape ecology offer their insights and perspectives

  Seascape Ecology is a must-read for researchers and professionals in an array of disciplines, including marine biology, environmental science, geosciences, marine and coastal management, and environmental protection. It is also an excellent supplementary text for university courses in those fields.

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  Yellow-Band Diseases

  Andrew Bruckner and Bernhard Riegl

  Coral disease is quickly becoming a crisis to the health and management of the world’s coral reefs. There is a great interest from many in preserving coral reefs. Unfortunately, the field of epizootiology is disorganized and lacks a standard vocabulary, methods, and diagnostic techniques, and tropical marine scientists are poorly trained in wildlife pathology, veterinary medicine, and epidemiology. Diseases of Coral will help to rectify this situation.

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  Disentangling Habitat Concepts for Demersal Marine Fish Management

  Sophie A. M. Elliott, Rosanna Milligan, Michael R. Heath, William R. Turrell, and David M. Bailey

  Fishing and other anthropogenic impacts have led to declines in many sh stocks and modication of the seabed. As a result, efforts to restore marine ecosystems have become increasingly focused on spatially explicit management methods to protect sh and the habitats they require for survival. This has led to a proliferation of investigations trying to map ‘habitats’ vulnerable to anthropogenic impacts and identify sh resource requirements to meet conservation and management needs. A wide range of habitat-related concepts, with different uses and understandings of the word ‘habitat’ itself has arisen as a consequence. Inconsistencies in terminology can cause confusion between studies, making it difcult to investigate and understand the ecology of sh and the factors that affect their survival. Ultimately, the inability to discern the relationships between sh and their environment clearly can hinder conservation and management measures for sh populations. This review identies and addresses the present ambiguity surrounding denitions of habitat and habitatrelated concepts currently used in spatial management of demersal marine sh populations. The role of spatial and temporal scales is considered, in addition to examples of how to assess sh habitat for conservation and management purposes.

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  Open Ocean Deep Sea

  Jeroen Ingels, Malcolm Clark, Michael Vecchione, Jose A. A. Perez, Lisa A. Levin, Imants G. Priede, Tracey Sutton, Ashley Rowden, C. R. Smith, Moriaki Yasuhara, Andrew K. Sweetman, Thomas Soltwedel, R. S. Santos, Bhavani Narayanaswamy, Henry A. Ruhl, Katsunori Fujikura, Linda Amaral-Zettler, Daniel Jones, Andrew Gates, P. V. R. Snelgrove, Patricio Bernal, and Saskia van Gaever

  The deep sea comprises the seafloor, water column and biota therein below aspecified depth contour. There are differences in views among experts and agencies regarding the appropriate depth to delineate the “deep sea”. This chapter uses a 200 metre depth contour as a starting point, so that the “deep sea” represents 63 per cent of the Earth’s surface area and about 98.5 per cent of Earth’s habitat volume (96.5 per cent of which is pelagic). However, much of the information presented in this chapter focuses on biodiversity of waters substantially deeper than 200 m. Many of the other regional divisions of Chapter 36 include treatments of shelf and slope biodiversity in continental-shelf and slope areas deeper than 200m. Moreover Chapters 42 and 45 on coldwater corals and vents and seeps, respectively, and 51 on canyons, seamounts and other specialized morphological habitat types address aspects of areas in greater detail. The estimates of global biodiversity of the deep sea in this chapter do include all biodiversity in waters and the seafloor below 200 m. However, in the other sections of this chapter redundancy with the other regional chapters is avoided, so that biodiversity of shelf, slope, reef, vents, and specialized habitats is assessed in the respective regional or thematic chapters.

  AB - The deep sea comprises the seafloor, water column and biota therein below aspecified depth contour. There are differences in views among experts and agencies regarding the appropriate depth to delineate the “deep sea”. This chapter uses a 200 metre depth contour as a starting point, so that the “deep sea” represents 63 per cent of the Earth’s surface area and about 98.5 per cent of Earth’s habitat volume (96.5 per cent of which is pelagic). However, much of the information presented in this chapter focuses on biodiversity of waters substantially deeper than 200 m. Many of the other regional divisions of Chapter 36 include treatments of shelf and slope biodiversity in continental-shelf and slope areas deeper than 200m. Moreover Chapters 42 and 45 on coldwater corals and vents and seeps, respectively, and 51 on canyons, seamounts and other specialized morphological habitat types address aspects of areas in greater detail. The estimates of global biodiversity of the deep sea in this chapter do include all biodiversity in waters and the seafloor below 200 m. However, in the other sections of this chapter redundancy with the other regional chapters is avoided, so that biodiversity of shelf, slope, reef, vents, and specialized habitats is assessed in the respective regional or thematic chapters.

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  Cyanobacterial Associated Colored Band Diseases of the Atlantic/Caribbean

  Laurie L. Richardson, Aaron W. Miller, Patricia Blackwelder, and Husain Al-Sayegh

  Coral disease is quickly becoming a crisis to the health and management of the world’s coral reefs. There is a great interest from many in preserving coral reefs. Unfortunately, the field of epizootiology is disorganized and lacks a standard vocabulary, methods, and diagnostic techniques, and tropical marine scientists are poorly trained in wildlife pathology, veterinary medicine, and epidemiology. Diseases of Coral will help to rectify this situation.

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  Coral Research in the Galapagos Islands, Ecuador

  Joshua Feingold and Peter W. Glynn

  This chapter summarizes the scientific knowledge of scleractinian corals in the Galapagos Archipelago. A general introduction to coral biology is followed by a brief history of coral research in the islands. Subsequent sections discuss responses of corals to broad-scale impacts, anthropogenic stress on Galapagos corals, and recommendations for management of this important resource. Following an initial period (1835-1960s) of cataloging the species present in the Galapagos Islands, research on coral ecology was initiated by Wellington in the 1970s. Glynn and Wellington more thoroughly examined the surprising abundance and distribution of corals and reef frameworks in the 1980s. Glynn and other workers then documented mass mortalities of corals due to the 1982-1983 ENSO disturbance. Subsequent research focused upon this natural phenomenon and its effect on coral distribution, ecology, and physiology. Most recently, resilience and recovery of coral populations were reported. Compared to most other regions, there is little anthropogenic impact to corals in the Galapagos Islands. However, climate change and ocean acidification have effects, and there is evidence of impacts associated with fisheries and tourism. Recommendations for management decisions conclude this chapter.

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  Evaluating Water-Depth Variation and Mapping Depositional Facies on the Great Bahama Bank - a "Flat-Topped" Isolated Carbonate Platform

  Paul Mitch Harris, James Ellis, and Samuel J. Purkis

  Great Bahama Bank (GBB) has long served as a frequently visited and well-studied example of a flat-topped, isolated carbonate platform. As such, GBB stands behind much of our understanding of modern processes and products of carbonate sedimentation. The geological models derived from studies on GBB are commonly used to illustrate depositional facies variations and frequently serve as reservoir analogs.

  We have used Landsat TM and ETM+ imagery and an extensive set of water depth measurements to first critically evaluate the magnitude and patterns of bathymetry across GBB. We then integrated the seafloor sample data of Reijmer et al (2009) along with a small number of additional samples with the Landsat imagery compiled into ArcGIS and analyzed with eCognition to develop a depositional facies map that is more robust than previous versions. The new maps, in our opinion, can serve as a template for better characterizing GBB at all scales, highlight future research areas where "ground-truthing" is needed to further investigate facies patterns, and facilitate better use of this isolated carbonate platform as an analog for both exploration- and reservoir-scale facies analysis. As examples of information that can be extracted from the maps, we analyze the platform margins of GBB with respect to their orientation, examine the relationship between water depth and facies type, interrogate facies position and breadth across the platform top, and relook at the occurences of whitings relative to the distribution of mud on the platform.

  The geospatial data for GBB are compiled into a 3.9 GB GIS database which is included on the DVD of this digital publication. The GIS contains raw data, interpretive products, and visualization examples that were produced during the development of the water depth and facies maps of GBB, including the Landsat TM imagery, DEM, images developed by combining layers in the GIS, and facies and whitings maps. In addition, the Projects folder of the GIS contains files that automatically display images, maps, and DEMs with an appropriate symbology in ArcGIS version 10.1 (.mxd), ArcGIS Explorer version (Build) 1750 and 2500 (.nmf), and GlobalMapper version 14-1 (.wks).

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  The Near-Surface Layer of the Ocean: Structure, Dynamics and Applications

  Alexander Soloviev and Roger Lukas

  • Updating the previous edition of the book due to remarkable results from synthetic aperture radar satellites, from satellites which measure sea surface salinity, and computational fluid dynamic models open new opportunities in understanding the processes in the near-surface layer of the ocean
  • Monitoring short surface waves has significantly progressed due to passive acoustic methods
  • Gives a comprehensive account of the structures and dynamics of the near-surface layer of the ocean
  • Clarifies theoretical concepts that are developed from fundamental physics and thermodynamics
  • Shows results of major air-sea interaction experiments (including those obtained with the participation of the authors), included in the analysis
  • Includes an overview of the results for important oceanographic applications such as remote sensing, climate, hurricane physics, oil spills, marine biology, optics and acoustics

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  Coral Reefs of the Chagos Archipelago, Indian Ocean

  Mebs Ateweberhan, Allen C. Chen, Alasdair Harris, Rachel Jones, Shashank Keshavmurthy, Carl Lundin, David Obura, Samuel J. Purkis, Peter Raines, Bernhard Riegl, Michael H. Schleyer, Anne L. S. Sheppard, Jerker Tamelander, John R. Turner, Shakil Visram, and Sung-Yin Yang

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  Atlas of Saudi Arabian Red Sea Marine Habitats

  Andrew Bruckner, Gwilym Rowlands, Bernhard Riegl, Samuel J. Purkis, A Williams, and Philip Renaud

  The Red Sea is a narrow, but relatively deep, oceanic trough that extends for over 1900 km, between 13º and 28º N latitude. It has a total surface area of roughly 438,000 km², with a width of approximately 180 km in the north, and 354 km at its widest point in the south. The Red Sea narrows to about 29 km in the Strait of Bab el Mandab, where it joins the Gulf of Aden and the Indian Ocean. The maximum depth is over 2200 m, with an average depth of 490 m. The Red Sea is shallowest at the southern end, with depths of only 130 m in the Strait of Bab el Mandab. It is the world’s northernmost tropical sea, with extensive shallow shelves that support complex coral reefs and associated ecosystems.

  The Red Sea is part of the tropical Indo-Pacific Ocean, which encompasses the largest marine ecosystem on earth and also the most diverse. Much of the Saudi Arabian Red Sea coastline is characterized by coastal fringing reefs that are narrow, extending tens of meters from shore before plummeting to deep water. However, several regions in Saudi Arabia contain extensive seagrass beds, offshore reef habitats, mangroves, and algal flats. These areas support a wide range of reef morphologies, such as barrier reefs, patch reefs, ridge reefs, atolls, tower reefs, pinnacles, pillars, and spur and groove structures, as well as diverse coral communities growing on algalderived limestone structures (Sheppard et al. 1992).

  Over a four year period, the Living Oceans Foundation has been involved in a massive scale marine habitat research project in the Red Sea. The results are now published in this first ever atlas of the Red Sea marine habitats of offshore coral reefs. It is available for download in both English and Arabic.

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  Coral Reef Remote Sensing: A Guide for Mapping, Monitoring and Management

  James A. Goodman, Samuel J. Purkis, and Stuart R. Phinn

  Remote sensing stands as the defining technology in our ability to monitor coral reefs, as well as their biophysical properties and associated processes, at regional to global scales. With overwhelming evidence that much of Earth’s reefs are in decline, our need for large-scale, repeatable assessments of reefs has never been so great. Fortunately, the last two decades have seen a rapid expansion in the ability for remote sensing to map and monitor the coral reef ecosystem, its overlying water column, and surrounding environment. Remote sensing is now a fundamental tool for the mapping, monitoring and management of coral reef ecosystems. Remote sensing offers repeatable, quantitative assessments of habitat and environmental characteristics over spatially extensive areas. As the multi-disciplinary field of coral reef remote sensing continues to mature, results demonstrate that the techniques and capabilities continue to improve. New developments allow reef assessments and mapping to be performed with higher accuracy, across greater spatial areas, and with greater temporal frequency. The increased level of information that remote sensing now makes available also allows more complex scientific questions to be addressed. As defined for this book, remote sensing includes the vast array of geospatial data collected from land, water, ship, airborne and satellite platforms. The book is organized by technology, including: visible and infrared sensing using photographic, multispectral and hyperspectral instruments; active sensing using light detection and ranging (LiDAR); acoustic sensing using ship, autonomous underwater vehicle (AUV) and in-water platforms; and thermal and radar instruments.

  Emphasis and Audience This book serves multiple roles. It offers an overview of the current state-of-the-art technologies for reef mapping, provides detailed technical information for coral reef remote sensing specialists, imparts insight on the scientific questions that can be tackled using this technology, and also includes a foundation for those new to reef remote sensing. The individual sections of the book include introductory overviews of four main types of remotely sensed data used to study coral reefs, followed by specific examples demonstrating practical applications of the different technologies being discussed. Guidelines for selecting the most appropriate sensor for particular applications are provided, including an overview of how to utilize remote sensing data as an effective tool in science and management. The text is richly illustrated with examples of each sensing technology applied to a range of scientific, monitoring and management questions in reefs around the world. As such, the book is broadly accessible to a general audience, as well as students, managers, remote sensing specialists and anyone else working with coral reef ecosystems.

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  Analogs for Carbonate Deposition in Early Rift Setting

  Paul Mitch Harris, James Ellis, and Samuel J. Purkis

  Driven by requests to provide carbonate analogs for subsurface hydrocarbon exploration in rift settings, we have identified and described select examples, summarized them from a carbonate perspective, and assembled them into a GIS database. The analogs show a spectrum of sizes, shapes and styles of deposition for lacustrine and marginal marine settings, wherein the types of carbonates inferred from seismic and cores (emphasis on microbialites, tufas, and travertines) can be illustrated.

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  Predator-Prey Interactions

  Michael Heithaus and Jeremy Vaudo

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  Laboratory Exercises in Biology

  Edward O. Keith, Charles Messing, Emily F. Schmitt Lavin, and Joshua Stephen Feingold

  Third edition

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  Coral Reefs of the Gulf: Adaptation to Climatic Extremes in the World’s Hottest Sea

  Bernhard Riegl and Samuel J. Purkis

  This book treats coral reefs in the water body enclosed between Iran and the Arabian peninsula that in this book we refer to as “The Gulf”. The area is variably also known as the Persian or Arabian Gulf, or as the ROPME Inner Sea Area. The Gulf has a long research history and a compilation of present knowledge about its reefs is timely. In 16 chapters, this book guides the reader through environmental and geological determinants of reefbuilding, through the dynamics of reef corals and reef fishes, to the taxonomy of key reef organisms. Also the importance of artificial structures as novel reef substrates is discussed.

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  Schlerochronology

  Kevin P. Helmle and Richard E. Dodge

  Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.

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  Treatise on Invertebrate Paleontology

  Hans Hess, Charles Messing, and William I. Ausich

  This volume is edited by Paul Selden, authors are Hans Hess and Charles G. Messing, coordinating author is William I. Ausich. This is the first volume to be published in an extensive revision of the Class Crinoidea. The present volume deals with the Subclass Articulata that contains all post-Paleozoic and living crinoids. The descriptions are preceded by an introduction, a chapter on the morphology of articulate crinoids, a glossary of important terms, and an overview of classification. The reference list is comprehensive for this volume.

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  Modification of Turbulence at the Air-Sea Interface Due to the Presence of Surfactants and Implications for Gas Exchange. Part II: Numerical Simulations

  Silvia Matt, Atsushi Fujimara, Alexander Soloviev, and Shin Hyung Rhee

  We conducted high-resolution non-hydrostatic numerical simulations to study the effect of surfactants on near-surface turbulence. Laboratory experiments at the UM RSMAS ASIST facility presented in a companion paper report a reduction of turbulence below the air-sea interface and an increase of the surface drift velocity in the presence of surfactants. We implement the effect of surfactants as a rheological, viscoelastic boundary condition at the surface. Our numerical experiments are consistent with the results of the laboratory experiments. We also simulated the effect of surfactants on the temperature difference across the thermal molecular sublayer (cool skin) and on gas transfer velocity. The numerical simulations demonstrate an increase in the temperature difference across the cool skin and reduction of the gas transfer velocity in the presence of surfactant. The results also reveal the effect of surfactants on the different types of molecular sublayers (viscous, thermal and diffusion), which is important for the development of proper parameterization of the interfacial component of air-sea gas exchange under low and moderate wind speed conditions.

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  Remote Sensing and Global Environment Change

  Samuel J. Purkis and Victor V. Klemas

  Remote Sensing plays a key role in monitoring the various manifestations of global climate change. It is used routinely in the assessment and mapping of biodiversity over large areas, in the monitoring of changes to the physical environment, in assessing threats to various components of natural systems, and in the identification of priority areas for conservation.

  This book presents the fundamentals of remote sensing technology, but rather than containing lengthy explanations of sensor specifications and operation, it concentrates instead on the application of the technology to key environmental systems. Each system forms the basis of a separate chapter, and each is illustrated by real world case studies and examples.

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  Coral Reefs in the Mariana Islands

  Bernhard Riegl

  Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.

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  Coral Reefs in the Western Atlantic/Caribbean

  Bernhard Riegl

  Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.

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  Coral Reefs in the Persian/Arabian Gulf

  Bernhard Riegl and Samuel J. Purkis

  Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.

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  Persian/Arabian Gulf Coral Reefs

  Bernhard Riegl and Samuel J. Purkis

  Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.

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  Modification of Turbulence at the Air-Sea Interface Due to the Presence of Surfactants and Implications for Gas Exchange. Part I: Laboratory Experiment

  Alexander Soloviev, S. Matt, Mikhail Gilman, H. Huhnerfuss, Brian K. Haus, D. Jeong, I. Savelyev, and Mark A. Donelan

  The air-sea gas transfer of gases like CO2 is substantiallydetermined bythe properties of the aqueous diffusion sublayer and free-surface turbulent boundarylayer. Little is known about the effect of surfactants on turbulence in the near-surface layer of the ocean. In order to investigate the effect of surfactants on turbulent exchanges below the air-sea interface, we have conducted a series of laboratoryexperiments at the UM RSMAS Air-Sea Interaction Saltwater Tank (ASIST) facility. Results from these experiments demonstrate that the surfactant monolayer suppresses turbulence and reduces drag below the water surface and increases the surface drift velocity. This effect is important for parameterization of the interfacial component of gas exchange under low wind speed conditions. From the theoretical standpoint, the mechanism of the turbulence reduction can be explained bythe modification of the “streaks” in the buffer zone near the interface byvisco-elastic properties of the water surface when surfactants are present. These findings are consistent with results from high-resolution non-hydrostatic numerical simulations presented in a companion paper.