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With no linear cause-and-effect relationship between marine environmental changes and the often human-induced stressors which cause them, the changes to our seas and oceans are complex, uncertain, and arising due to multiple and interconnected issues. Studying environmental changes to the seas and oceans through a variety of perspectives and disciplines, this pioneering book outlines the challenges of researching marine environmental issues.
This book contributes to the current discussion on global environmental changes by discussing modifications in marine ecosystems related to global climate changes. In marine ecosystems, rising atmospheric CO2 and climate changes are associated with shifts in temperature, circulation, stratification, nutrient input, oxygen concentration and ocean acidification, which have significant biological effects on a regional and global scale. Knowing how these changes affect the distribution and abundance of plankton in the ocean currents is crucial to our understanding of how climate change impacts the marine environment. Ocean temperatures, weather and climatic changes greatly influence the amount and location of nutrients in the water column. If temperatures and currents change, the plankton production cycle may not coincide with the reproduction cycle of fish. The above changes are closely related to the changes in radiative forcing, which initiate feedback mechanisms like changes in surface temperature, circulation, and atmospheric chemistry.
Global environmental change (including climate change, biodiversity loss, changes in hydrological and biogeochemical cycles, and intensive exploitation of natural resources) is having significant impacts on the world's oceans. This book advances knowledge of the structure and functioning of marine ecosystems, and their past, present, and future responses to physical and anthropogenic forcing. It illustrates how climate and humans impact marine ecosystems, providing a comprehensive review of the physical and ecological processes that structure marine ecosystems as well as the observation, experimentation, and modelling approaches required for their study. Recognizing the interactive roles played by humans in using marine resources and in responding to global changes in marine systems, the book includes chapters on the human dimensions of marine ecosystem changes and on effective management approaches in this era of rapid change. A final section reviews the state of the art in predicting the responses of marine ecosystems to future global change scenarios with the intention of informing both future research agendas and marine management policy. Marine Ecosystems and Global Change provides a detailed synthesis of the work conducted under the auspices of the Global Ocean Ecosystems Dynamics (GLOBEC) programme. This research spans two decades, and represents the largest, multi-disciplinary, international effort focused on understanding the impacts of external forcing on the structure and dynamics of global marine ecosystems.
Global climate change is a major threat to marine biodiversity worldwide. Average changes in ocean temperature, pH, and oxygenation are re-shaping marine communities, with significant impacts on the critical services that marine ecosystems provide to mankind. As global climate change continues, the frequency, duration, and intensity of extreme weather events are also predicted to increase, with fast and far-reaching consequences on marine species, including mass mortality and disruption of ecological processes. As a result, millions of ocean-dependent livelihoods and jobs are also at risk, with consequent economic impacts. Given the current climate and biodiversity crisis, the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services has emphasized the relevance of (1) increasing knowledge and protection of biodiversity and (2) assessing species climate-driven extinction risks. To achieve these goals, we need to understand organism-environment-ecology-evolution interactions at various levels of the biological hierarchy, from molecules to ecosystems. However, we are still lacking a comprehensive understanding of the molecular mechanisms shaping phenotypic landscapes in the natural environment, and under different global change scenarios. To address such challenges, a new strategic program was also launched by the European Molecular Biology Laboratory (EMBL), “Molecules to Ecosystems”, to study life in context, and provide new research avenues in molecular life sciences. In this context, the emerging disciplines of Marine Omics and Marine Systems Biology will be key to supporting innovative solutions in marine ecosystem conservation and blue bioeconomy (for example uncover molecular traits underlying sensitivity/tolerance to environmental change, supporting assisted evolution approaches; molecular targets that can be used for diagnostics, monitoring and development of biotechnological applications).
Authoritative historical perspectives tracing the contribution of the HMS Challenger expeditions through to modern marine science Ecompasses oceanography, marine biology, marine geology and ocean science
Coastal and estuarine environments at the interface of terrestrial and marine areas are among the most productive in the world. However, since the beginning of the industrial era, these ecosystems have been subjected to strong anthropogenic pressures intensified from the second half of the 20th century, when there was a marked acceleration in the warming (climate change) of the continents, particularly at high latitudes. Coastal ecosystems are highly vulnerable to alteration of their physical, chemical and biological characteristics (marine intrusion, acidification of marine environments, changes in ecosystems, evolution and artificialization of the coastline, etc.).In contact with heavily populated areas, these environments are often the receptacle of a lot of chemical and biological pollution sources that significantly diminish their resilience. In this context of accelerated evolution and degradation of these areas important for food security of many populations around the world, it is necessary to better identify the factors of pressure and understand, at different scales of observation, their effects and impacts on the biodiversity and on the socio-eco-systems, in order to determine the degree of vulnerability of these coastal ecosystems and the risks they face. A transdisciplinary and integrated approach is required to prevent risks. Within this framework, operational coastal oceanography occupies an important place but also the implementation of a true socio-eco-system approach in order to set up an environmentally friendly development.
Marine mammals face a large array of stressors, including loss of habitat, chemical and noise pollution, and bycatch in fishing, which alone kills hundreds of thousands of marine mammals per year globally. To discern the factors contributing to population trends, scientists must consider the full complement of threats faced by marine mammals. Once populations or ecosystems are found to be at risk of adverse impacts, it is critical to decide which combination of stressors to reduce to bring the population or ecosystem into a more favorable state. Assessing all stressors facing a marine mammal population also provides the environmental context for evaluating whether an additional activity could threaten it. Approaches to Understanding the Cumulative Effects of Stressors on Marine Mammals builds upon previous reports to assess current methodologies used for evaluating cumulative effects and identify new approaches that could improve these assessments. This review focuses on ways to quantify exposure-related changes in the behavior, health, or body condition of individual marine mammals and makes recommendations for future research initiatives.