Download or read book Identification and Characterization of Arctic Nearshore Benthic Habitats written by D. H. Thomson and published by . This book was released on 1985 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present study, regional variation in benthic and intertidal biota ofthe central and eastern Canadian Arctic is analyzed. Benthic communities areidentified and the roles of depth, substrate, exposure, food supply andpredation in structuring these communities are identified.
Download or read book A Description of Arctic Nearshore Meiobenthos from Oiled and Unoiled Sediments at Cape Hatt Northern Baffin Island written by C. M. Martin and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study examines the distribution and compostion of subtidalmetobenthos present at the Baffin Island Oil Spill (BIOS) project site atCape Hatt, N.W.T. During 1982 and 1983, samples were collected inuncontaminatied areas and in areas that were treated with oil and dispersedoil during the BIOS experimental oil releases in 1981. The distribution ofmeiofauna was studied in relation to sediment grain size, orgainic carboncontent, temperature, and the distribution of oil in subtidal sediments.
Download or read book Canadian Technical Report of Fisheries and Aquatic Sciences written by and published by . This book was released on 1986 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Sciences and Fisheries Abstracts written by and published by . This book was released on 1994-10 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2013 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation and Integration of Spatial Analyses in Benthic Habitat Mapping with Application to Nearshore Arctic Environments written by Benjamin Misiuk and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of benthic habitat mapping has entered an era of automated statistical methods that have increased the capacity to produce maps as marine management tools. Spurred by a confluence of advances in acoustic remote sensing, open-source statistical tools, GIS, and computing power, these methods facilitate quick and objective mapping of habitats and physical seabed characteristics. Their performance and accessibility have led to widespread uptake, yet key spatial issues associated with these methods have not fully translated into the benthic habitat mapping workflow. Towards establishing "best practices", this thesis explores the application of several spatial concepts to benthic habitat mapping using three Canadian Arctic case studies. Relationships between seabed morphology and benthic habitats are well-established. Though recognized as a critical element in the field of geomorphometry, the scale dependence of these relationships is commonly neglected in habitat mapping. Chapter 2 provides evidence of the scale dependence of benthic terrain variables and demonstrates methods for testing and selecting from among many variables and scales for modelling the distribution of sediment grain size near Qikiqtarjuaq, Nunavut. Given challenges associated with marine data collection that are pronounced in the Arctic, benthic habitat maps commonly utilize multi-year and multisource datasets. Despite apparent advantages, there can be substantial challenges associated with the compatibility and spatial properties of such data. Chapter 3 demonstrates that spatially autocorrelated samples are likely to inflate estimates of predictive performance and uses a spatial resampling strategy to estimate and correct for inflation in a multi-model Arctic clam habitat map near Qikiqtarjuaq, Nunavut. Classified seabed maps are a common requirement for marine management and one of two broad approaches are often selected to produce them. Chapter 4 examines differences between classification and continuous modelling approaches in a spatial context to produce classified seabed sediment maps for inner Frobisher Bay, Nunavut. Non-spatial methods failed to indicate whether models could extrapolate to unsampled areas, which was a requirement for this study. When evaluated in a spatial context, the qualities of the classification approach made it more suitable, which was a function of ground-truth dataset characteristics and the predictive goals of the model. Non-spatial techniques may be appropriate for interpolation, but the ability to extrapolate needs to be examined in a spatial context.
Download or read book The Zoological Record written by and published by . This book was released on 1870 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts with Indexes written by and published by . This book was released on 1987 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Outer Continental Shelf Environmental Assessment Program Final Reports of Principal Investigators written by and published by . This book was released on 1989 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Benthic Biology of Two Near shore Arctic Locations and Potential Impacts of Sea Level Change Coastal Erosion and Climate Change written by Tanya Brown (Marieanne) and published by . This book was released on 2007 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts written by and published by . This book was released on 1997-04 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index de Recherche Du Canada Microlog written by and published by . This book was released on 1986 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: "An index and document delivery service for Canadian report literature".
Download or read book Arctic Research of the United States written by and published by . This book was released on 1991 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seafloor Geomorphology as Benthic Habitat written by Peter Harris and published by Elsevier. This book was released on 2011-11-21 with total page 947 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conservation of marine benthic biodiversity is a recognised goal of a number of national and international programs such as the United Nations Convention on Biodiversity (CBD). In order to attain this goal, information is needed about the distribution of life in the ocean so that spatial conservation measures such as marine protected areas (MPAs) can be designed to maximise protection within boundaries of acceptable dimensions. Ideally, a map would be produced that showed the distribution of benthic biodiversity to enable the efficient design of MPAs. The dilemma is that such maps do not exist for most areas and it is not possible at present to predict the spatial distribution of all marine life using the sparse biological information currently available. Knowledge of the geomorphology and biogeography of the seafloor has improved markedly over the past 10 years. Using multibeam sonar, the benthic ecology of submarine features such as fjords, sand banks, coral reefs, seamounts, canyons, mud volcanoes and spreading ridges has been revealed in unprecedented detail. This book provides a synthesis of seabed geomorphology and benthic habitats based on the most recent, up-to-date information. Introductory chapters explain the drivers that underpin the need for benthic habitat maps, including threats to ocean health, the habitat mapping approach based on principles of biogeography and benthic ecology and seabed (geomorphic) classification schemes. Case studies from around the world are then presented. They represent a range of seabed features where detailed bathymetric maps have been combined with seabed video and sampling to yield an integrated picture of the benthic communities that are associated with different types of benthic habitat. The final chapter examines critical knowledge gaps and future directions for benthic habitat mapping research. - Reviews and compares the different methodologies currently being used - Includes global case studies - Provides geological expertise into what has traditionally been a biological discipline
Download or read book Exploring the North American Arctic Benthos written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chukchi and Beaufort seas benthic habitats are home to a multitude of ecologically and commercially important organisms that are subject to ongoing environmental changes, including the impacts of climate change and increased exposure to contaminants. Benthic bacteria and archaea can be considered biogeochemical engineers. They play a major role in organic matter (OM) degradation and nutrient cycling and their community structure can reflect changes in environmental conditions such as OM composition and quantity, nutrient availability, redox conditions, and natural/anthropogenic contaminants (e.g. petroleum hydrocarbons). Yet, sediment microbial communities have rarely been examined in these marginal seas of North American Arctic. In this dissertation, I characterized marine sediment microbial communities along environmental gradients in the Beaufort (Chapter 2) and Chukchi seas (Chapter 3) and assess Arctic benthic microbial community response to oil exposure (Chapter 4). I assessed diversity, community structure, and environmental correlates of prokaryotic communities via 16S rRNA amplicon sequencing in surface sediments (upper 1 cm) from the Northern Bering Sea to the Amundsen Gulf in the southern Beaufort Sea. On a broad spatial scale encompassing the whole study area, I observed three distinct microbial assemblages. One assemblage was characteristic of the Northern Bering-Chukchi seas shelf, and two distinguished nearshore and offshore sediments in the Beaufort Sea. Within the Beaufort Sea, four assemblages were identified, reflecting habitat heterogeneity with respect to OM loading, water depth, and nearshore/riverine input, including a major influence of the Mackenzie River. Two assemblages were distinguished within the Bering-Chukchi region, including one representative of suboxic sediments and one suggesting influence of phytodetrital OM input as evidenced by the abundance of diatom/particle-associated microbes. These two assemblages may also reflect differences between local versus advective OM inputs. Incubation experiments exposing Arctic marine sediments to fresh and weathered crude oil under anaerobic and aerobic conditions were performed to assess oil biodegradation potential and identify putative oil-degrading microbes in the benthos. Molecular analyses revealed that significant community shifts occurred in the oiled treatments, with distinct communities emerging following exposure to fresh versus weathered oil, and in oxic versus anoxic conditions. The work presented here constitutes the first large-scale survey of benthic microbes in this region of the North American Arctic, including their response to petroleum contamination, generating valuable baseline data for the changes to come.
Download or read book Seascape Ecology from characterization to evaluation of state and change over time written by Monica Montefalcone and published by Frontiers Media SA. This book was released on 2023-08-22 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Landscape ecology has been a discrete, established discipline since at least 1980. Its marine counterpart, seascape ecology, is barely a decade old, its first applications dating from the early 2010s. Lack of perception of the marine environment hampers the adoption of many landscape ecology approaches to the sea. Seascape ecology relies on special technologies such as remote sensing (either acoustic or optical), robotics, and scuba diving. Both disciplines deal with the spatial configuration of ecosystems and consider environmental heterogeneity and dynamics as the main subjects of study and the key for ecosystem functioning and persistence. Seascape is here intended as the totality of natural and anthropogenic characters of a marine region. To the geologist, it is defined by sedimentology and underwater geomorphology, to the biologist by the nature of the living cover of the seafloor, to the ecologist by the relationships among functional processes and the spatial organization of ecosystems. The goal of this research topic is to encourage original research, case studies, reviews, and viewpoints to identify research priority gaps and possibly contribute to filling them in. We will appreciate, in particular, manuscripts dealing with recent advances such as high-resolution habitat mapping; underwater soundscape and biophony; development, application and validation of biotic indices to assess seafloor integrity (as requested, for instance, by recent European Directives). Papers of interest may discuss the multivarious facets of stability and describe resistance and resilience patterns, the role of stress and disturbance, regime shift and phase shift, or may take up the challenge of integrating coastal landscape and seascape analyses. Studies of long-term series are welcome, as well as methodological improvements, and macroecological approaches on the importance of species diversity and connectivity in seascape organization.
