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International audience; This introductory chapter delineates the challenge of formalizing a concept-paradigm and provides specific examples that could be considered as models of socio-ecological viability. We investigate the benefits that the concept of coviability brings to the concept of "sustainable development". Contributions will be given throughout the book and will be summarized in a final chapter, which will define the concept-paradigm through a transdisciplinary approach.

International audience; The concepts for a mathematical approach to coviability, deriving from Aubin's viability theory, as a generalisation of control theory, are introduced and examplified.

Coviability of Social and Ecological Systems: Reconnecting Mankind to the Biosphere in an Era of Global Change comprises two volumes and forty-three chapters totaling about 900 pages. The book is prefaced by an economist and concluded by an ecologist; its postscript is written by a socio-anthropologist. A hundred researchers, belonging to more than twenty disciplines, contributed to its development; and this under the direction, in full interdisciplinarity, of twelve co-editors. Before closing the book, it is necessary to clarify the main point, rather than offer an inaccessible summary. At this stage, it is important to identify the significance of this scientific paradigm of coviability, especially in an international context confronted with an ecological imperative. The book seeks to draw from the set of works an initial definition of the paradigm of coviability. This goal's point of departure is the plural definitions and disciplines, the heterogeneous works giving space for reflection. This new paradigm of socio-ecological coviability offers an ecological transition promoted at the global, national and local scales. An integrative paradigm is suggested to counter the dominant naturalistic paradigm. The goal of this paradigm is "living in harmony with nature," that is, creating harmony between humans and nonhumans. The challenge consists of breaking free from a reductive anthropocentrism in order to integrate an ontology open to a socio-ecological dimension, with the goal of reconnecting humanity to the biosphere. The diversity of the situations approached by the different research teams makes it possible to test a definition of socio-ecological coviability that may be: a property of interactive dependence between humans and nonhumans joined in a relationship that is contained by regulations and constraints. This relationship establishes a link of viability subjected to an integration threshold of the complex human/nonhuman system determining the limits of coviability's elasticity, whose realization remains the coevolution in an integrated socio-ecological system. The legal and political formalization of the coviability paradigm is designed to contribute to the ecological transition by establishing a new general Principle that could reposition the goal of sustainable development in terms of viability.

International audience

This book [2 vol.] considers the principle of 'sustainable development' which is currently facing a growing environmental crisis. A new mode of thinking and positioning the ecological imperative is the major input of this volume. The prism of co-viability is not the economics of political agencies that carry the ideology of the dominant/conventional economic schools, but rather an opening of innovation perspectives through science. This volume, through its four parts, more than 40 chapters and a hundred authors, gives birth to a paradigm which crystallizes within a concept that will support in overcoming the ecological emergency deadlock.

International audience; This book considers the principle of 'sustainable development' which is currently facing a growing environmental crisis. A new mode of thinking and positioning the ecological imperative is the major input of this volume. The prism of co-viability is not the economics of political agencies that carry the ideology of the dominant/conventional economic schools, but rather an opening of innovation perspectives through science. This volume, through its four parts, more than 40 chapters and a hundred authors, gives birth to a paradigm which crystallizes within a concept that will support in overcoming the ecological emergency deadlock.

International audience; I take the reader along for a long and hard-fought journey down the levels of today's society Inferno, leading to a radical interpretation of the contemporary integral crisis through the dual lens of sciences and humanities. As the concepts are built onto one another in the process, be warned that there is no royal road to the passage to transformation that is aimed at, where this historical rewind sheds light on a possible change.

This second volume is the work of more than 55 authors from 15 different disciplines and includes complex systems science which studies the viability of components, and also the study of empirical situations. As readers will discover, the coviability of social and ecological systems is based on the contradiction between humanity, which adopts finalized objectives, and the biosphere, which refers to a ecological functions. We see how concrete situations shed light on the coviability's determinants, and in this book the very nature of the coviability, presented as a concept-paradigm, is defined in a transversal and ontological ways. By adopting a systemic approach, without advocating any economic dogma (such as development) or dichotomizing between humans and nature, while emphasizing what is relevant to humans and what is not, this work neutrally contextualizes man's place in the biosphere. It offers a new mode of thinking and positioning of the ecological imperative, and will appeal to all those working with social and ecological systems.

Les écosystèmes côtiers, qui concentrent actuellement 70 % de la population mondiale, sont particulièrement impactés par le changement climatique et les activités anthropiques. D'où les espoirs placés dans la création d'aires marines protégées (AMP), qui favorisent la résilience des systèmes vivants et la conservation des espèces. Au cours des dernières années, un véritable consensus international s'est progressivement imposé quant à l'intérêt de les multiplier. Cependant, de nombreuses incertitudes demeurent sur leur efficacité réelle et sur les modalités de leur mise en oeuvre. Les enjeux sociétaux qui sont associés à la multiplication des AMP interrogent les scientifiques, notamment en termes d'acceptation sociale, de régulation juridique et de pérennité des dispositifs mis en place. Ainsi, entre soutien au développement des AMP et analyse des controverses dont elles font parfois l'objet, cet ouvrage apporte un éclairage interdisciplinaire sur le développement de ces nouveaux espaces de conservation. Les études présentées ici sont centrées sur l'Afrique du Nord-Ouest (Algérie, Maroc et Sénégal). À travers le regard de juristes, d'écologues, de géographes, d'économistes, elles illustrent le potentiel associé à ce mode de conservation des zones marines et côtières. Elles questionnent par ailleurs l'efficience des AMP, tout en soulignant leur intérêt, bien au-delà des territoires où elles se situent.

International audience; no abstract

International audience; no abstract

At about 20 % of total GHG emissions, land use, land use change and the forestry (LULUCF) sectors contribute significantly to global green house gas (GHG) emissions. This percentage may be significantly higher in countries with huge forest resources, like Indonesia. In Indonesia, forests are increasingly converted to satisfy the growing demand for commercial agricultural products, most notably oil palm (Elaeis guineensis), not only for food but also for biofuels. Although forest losses caused by oil palm expansion are considered to be one of major contributors to land use change (LUC), oil palm expansion has less visible additional indirect effects in accelerating forest transformation. These are hardly studied, as they require an in depth knowledge and understanding of socio-economic changes caused by oil palm expansion at the grass-root level, the household level. These complex indirect effects receive no or only scant attention. This is striking to note, since they may become a major cause of forest conversion in the (near) future. Oil palm production leads to complex population redistribution. Local people are displaced not only by large scale investors, but also sold out by in-migrants. Large numbers of migrants are entering the Indonesia oil palm producing regions, hoping to benefit from the economic opportunities oil palm plantations provide. The search for arable land by a fast growing population puts increasing pressure on remaining (protected) forest areas, when they start investing in land for small scale oil palm plantations. Many of the remaining areas consist of peatlands. GHG emissions are therefore expected to rise tremendously. Analyzing these indirect socio-economic land use effects associated with oil palm expansion is therefore urgently required and is the main objective of this chapter.

Ce papier a pour finalité d'explorer les défis, les acteurs et les dynamiques de la gouvernance mondiale pour l'environnement et le développement durable, d'analyser sa capacité à satisfaire les attentes des pays du Sud en termes de développement et d'équité, et enfin d'identifier les conséquences de l'absence d'interactions entre le Nord et le Sud - dont les priorités et les aspirations sont rarement convergentes - sur le futur de cette gouvernance. Le papier suggère que sans un renforcement cohérent du cadre institutionnel et normatif de cette gouvernance, d'un compromis politique entre le Nord et le Sud sur les responsabilités de mise en oeuvre ainsi qu'une implication effective des acteurs non-étatiques dans les processus engagés, l'atteinte des objectifs escomptés restera une utopie. Cet argument sera défendu par l'évaluation de la gouvernance mondiale du changement climatique et ses retombées sur les pays du Sud en termes de défis et d'opportunités.

Studying the coviability of farming systems implicates three main challenges: (i) ensuring a minimum level of performance on the multiple functions of the system, (ii) ensuring the reproducibility of the system in time and (iii) ensuring adaptability to an uncertain context. The objective of this chapter is to show how the mathematical framework of viability theory is a relevant tool for handling these three issues so as to assess the coviability of farming systems. After briefly presenting the main concepts associated to viability theory, we illustrate (based on three examples), how this framework can be used to consider the three issues mentioned. A first example based on a bio-economic model developed at the national level (France) illustrates how viability theory makes it possible to consider, simultaneously, multiple dimensions of performance (in this case biodiversity and farmers’ income) without having to weight or rank these dimensions. A second example, based on a model linking bird dynamics to grassland management by grazers in a marshland area (Marais Poitevin, France), illustrates how the algorithms associated to viability theory make it possible to find the fine adjustment of grazing sequences, ensuring suitable habitat characteristics for the birds both in the short term and the long term. The last example, based on a model of multi-species livestock farming system (Bolivia), illustrates how management strategies robust to environmental uncertainty and that buffer environmental uncertainty can be found. We conclude on the advantages of viability theory in the search for new solutions in comparison with more classical simulation approaches based on a limited number of scenarios.

Climate change constitutes a new threat to the sustainability of coral ecosystems. The vulnerability of a coral ecosystem to climate-related hazards can greatly increase when it suffers from chronic anthropogenic disturbances (wastewater discharges, eutrophication). These indeed reduce the ability of coral reefs to withstand these hazards (resistance) and their potential to recover their initial condition (resilience) in case of very impacting hazards. Therefore, there is a risk of an amplifier feedback loop snapping in place with an endpoint of a crippling loss of resilience of coral formations and eventually the disappearance of most of them. Reducing such an amplifier feedback loop should be one of the main objectives of the coral coastal management in order to build new human/coral reef societies coviability to face climate change. Reconsidering the strategies of the creation of marine protected areas fits into this framework. This requires a focus on reef connectivity, resistance and resilience of species and species assemblages.

National (State) and international environmental law is based on a scientific dimension that places man at the heart of a normative system founded on a naturalist rationale. However, the dichotomy enacted between societies and ecosystems is questioned by the idea that humankind is part of nature (Stockholm Declaration, 1972; World Charter for Nature 1982), and by the fact that nature is part of a cultural construction (Descola P, Par delà nature et culture. Gallimard, Paris, 2005) leading to the concept of an anthroposystem (Lévêque C, Muxart T, Abbadie L, Weil A, Van der Leeuw S, L'anthroposystème: entité structurelle et fonctionnelle des interactions sociétés-milieux. In: Lévêque C, Van der Leeuw (dir) Quelles natures voulons-nous? pour une approche socio-écologique du champ de l'environnement. Elsevier, Paris, pp 110–129, 2003). The ecological imperative (pressing ecological needs), defined by climate change and biodiversity degradation, raises questions about the desirability of an anthropocentric environmental law, subjected to a neoliberal economic paradigm (we take here the example of French law). Furthermore, this law the vocation of which is to provide a response to the urgent ecological situation, is based on a technical dimension, obliterating the anthropological dimension of human diversity. The ensuing challenge consists of integrating an anthropological dimension to environmental law which is based essentially only on an ecological dimension in an anthropocentric manner, by being open to legal pluralism through accepting a “legal endogeneity” (i.e. law developed by the social body).

Fishery sector viability is usually considered as the combined viability of ecological, technical, social and/or economic subsystems considered as related subparts. This study examines this global viability at a lower level, i.e., as a result of the combination of idiosyncratic traits and activities of heterogeneous agents at the individual level. A multi-agent simulation model of the small-scale fishery sector in Senegal is presented to explore this approach. The aim of the study is to formalize diverse interaction sets between agents at the near individual level (communities) and evaluate their effect on the overall function and possible coordination of the fishery sector. Diverse sets of fishermen, traders, boats, trucks, consumers, fishing zones, markets, landing sites and fish products are formalized based on observations reported from the real sector. The model produces contrasted patterns and histories from one place (port, market) to another. Simulations show that at the integrated level, the fishery system may reach a homeostatic state by itself, where production, wealth, working population size and activity are stable and optimally organized (four indicators are presented in this respect). The homeostatic, steady regime of the simulated system can be deteriorated (e.g., when removing the entry/exit of working communities). The overall viability obtained by simulation is discussed. The role of self-adaptation, diversity, and history in the synchronization and good function of the integrated fishery system is highlighted.

Environmental law, whose purpose is to respond to the ecological urgency, is based on technical aspects, i.e. legal; obliterating the anthropological aspects of human diversity. It is from the assumption of an interweaved society-environment viability within the biosphere, that the legal approach can be revisited and re-established based on the adequacy of (social) usefulness to an (ecological) function, based on field studies. The adoption of a paradigm based on an approach of social viability within the Earth system, i.e. coviability, has resulted in a socio-ecological link being highlight and which needs to be formalized in legal regulation by though an adequacy between human needs and the ecological function.

Climate change, detected in the 1980s, is upsetting the status quo. Its causes, like those of the acidification of the ocean or the loss of biodiversity, are rooted in the way in which humans live and consume since 1950. To safeguard the common future of humanity and ecological systems, the window for taking action is a few decades. Efforts exist, such as those associated with the COP21 in 2015, but their extent remains unambitious given the urgency and stakes. This chapter explores, through a literature review, the brakes and drivers of coviability (respect for others, whether human or non-human, in a relationship of interdependence). The brakes appear rooted in societal references prevalent in the world of today and are the values of sceptics and of those who organize deliberately the doubt. Their roots lie in the interweaved development of capitalism, science and religion in the West and the advent here below of a modernity that would be the expression on earth of a supreme order truth. The identified levers of coviability are multiple: the individual (he develops mainly by exchanging with others); Legislative (climate justice and the legal framing of firms regarding their missions of public interest are under development) or Policy (developing countries are making efforts and have other histories and references). Adding delegations of vital entities, such as atmosphere, land, ocean, biodiversity and coviability, to nation State delegations is a proposition to strengthen the political component.

This chapter is part of a critical debate on the concept of ecosystem service. Since the Millennium Ecosystem Assessment, ecosystem services are seen as the key component of the relationship between nature (ecosystems) and human beings (sociosystems). We assume that this perspective is partly wrong. Ecosystems services are not always provided in a sustainable way. In order to bridge nature and human beings and to reach comprehensive coviability, a feedback loop is required between ecosystem and sociosystem services. The first part is dedicated to a critical presentation of ecosystem services definitions and their input to the viability of human societies. The second part focuses on the identification and the classification of ecosystem services attached to the reef environment of the Reunion Island. The third part focuses on the concept of sociosystem services whose four main types are: the 'sanctuary of habitats' service, the ecological engineering service, the service of 'reduction of the anthropogenic pressure on ecosystems', and the reduction of pollution service.

Vol. 2: Coviability Questioned by a Diversity of Situations Chapitre 40 La version en français sera publiée ultérieurement aux éditions Matériologiques en co-édition avec les éditions IRD; International audience; The babassu palm tree (Attalea speciosa Mart. ex Spreng.) is a species native to the Amazonian rainforest. The invasive nature of this palm tree results in a high density of babassu palm trees with a subsequent decrease in forage crop production. This is a serious problem for local farmers who have tried to resolve it by removing mature palms, seedlings and young individuals. Within these conditions, is coviability between the babassu palm tree and society possible? Our work consisted in developing tools and methods with the aim of producing knowledge and providing answers to this issue within a given territory. To understand the eco-socio-system, we have explored the available knowledge in the literature, produced specific field data, tools and methods such as mathematical modeling (dynamics of the palm tree population) and remote sensing (land use analysis thanks to Landsat high-resolution images and automatic detection of mature palm trees using Pleiades and GeoEye very high-resolution images). This multidisciplinary research in progress has already given us a good overview of the current situation of this eco-socio-system, enabling us to consider the best way to ensure its sustainability.

Protected areas (PA) are a central element of Human/Nature coviability. During the last twenty years, their number has increased dramatically and new, diverse objectives have been set. This diversification is accompanied by an increase in the lack of effectiveness on the conservation of biodiversity and endangered species. The financial shortages and the low social acceptability can also heavily impact the functioning of many PAs Faced with the increasing risk of “paper parks”, this chapter shows that governance of PAs is a critical tool for sustaining this aspect of human/nature coviability. Governance of PAs is proper to a decision-making process and deals with the management of information flow and the monitoring of actions. In the first part, the concept of environmental governance applied to PAs is specified. In the second part, governance is taken as a decision-making process, through the management of information flows. This approach is detailed in a third section. The PAs steering and control module and the social acceptance of PAs are introduced as a central element of their governance.

Our main objective is to elicit (The act of helping experts in constructing their knowledge to allow them to saved/shared) the notions of coviability, viability and perenniality, as they address man's relationship with his environment. The analysis focuses on the Society-Environment relationship, and is based on a systemic approach. This leads us to consider "System Earth" as a whole when the following crucial question is asked: how can we ensure the perenniality of this relationship while also respecting equity for and between peoples? As is the case for knowledge representation and reasoning, we use the notion of "angle" (semantic relativism) in order to better perceive and describe the main concepts and relationships that reside in this complex system. By adopting an angle on a system, a compartment is extracted, which is easier to analyze. It is through this compartmentalization that we base the reasoning about the perenniality of the Society-Environment relationship and the viability of "System Earth." We demonstrate that the term coviability used to relate the Society-Environment relationship, and deriving from a vision of Man vs Nature, is neither a systemic (nor holistic) vision. Other than at the global level, we believe that it is a mistake to take this term as a marker for decision-making and action. The compartmentalization protocol and its accompanying tools are commented upon and illustrated in two cases: the "Ecosystemic Service" angle and the "Territorial" angle. In the course of our study, we put forward a coherent set of concepts and relationships by adopting a systemic approach, which enriches our understanding of "System Earth" and of its viability. We also adopt an approach by compartmentalization that focuses on the “Organizational Function” that Society endows itself with, including that of managing the Society-Environment relationship.

Is there a sense, or a legitimacy, to viewing biodiversity conservation within the terms of coviability? And in this case, what are the long-term objectives that we could establish, and what are the obstacles that face us? Some researchers believe that nature must be "free from any human activity". Such an objective requires getting rid of facilities in order to return to naturalness, which implies drastic changes on an economic level. However, this scenario excludes man as an environmental player making it very difficult to consider coviability in these conditions... Conversely, others believe that biodiversity, in Europe at least, is the product of interactions between spontaneous ecological processes and human activities through the use of natural resources. Most of our supposedly natural systems are actually manmade systems, systems that are managed for particular services. Therefore, one wonders what will become these systems when we abandon certain usages or when the climate changes. Past landscapes may stir a feeling of nostalgia in us, but in this context the real question is what kind of nature do we desire? Which goals do we set for ourselves? We could think of a sustained and landscaped nature in which no nuisances would be allowed! Preserving biodiversity manifests itself through the demonstration that it is useful to humankind, and not through exclusive gestures. Coviability paths are therefore vague when it comes to biodiversity protection, so they require compromises and permanent adjustments between ecological and social systems. In reality, it is neither about imposing one's law on nature nor about liberating it from humankind. Rather, coviability aims at assisting and guiding the trajectory of ecological systems in the direction desired by society without excess and without complacency.

Today civil society have new expectations: scientists must not only measure risks and suggest solutions of mitigation or adaptation, but they also have to monitor and report changes in order to facilitate public decision. Reporting global change nowadays is based on indicators. The main challenge is to find synthetic, and valid indicators for time and space scales relevant to challenges and to mitigation and adaptation policies. Simultaneously, Earth observation has largely evolved. The number of spatial missions has drastically increased, and today we have relatively continuous data in space and in time. This remote sensing evolution causes a shift of paradigm. The richness of data, and the fact that they now cover a wide range of resolutions and temporal frequency, make a "bottom up" approach possible, which develops from the observations to construct a stochastic approach of the environmental and social dynamics at work. This chapter will attempt to give some examples of holistic indicators of changes in the fields of global water resources and biodiversity loss, provoked by human impacts on the Amazonian agricultural frontier. These themes mobilize the concept of coviability between societies and their environment.

The notion of coviability, which highlights the interdependence that exists between every system and its environment, is applied here to tourism systems at a territorial scale (territorialized tourism systems, TTS). TTS correspond to territorial systems whose dominant feature is touristic or recreational (which raises the question of their degree of specialization). Such systems can be described as articulated around a core system that is itself structured around tourism activities, in close interaction with an encompassing tourism system at a different scale (region, state, world, etc.), as well as with an intra-territorial environment conditioned by geophysical and ecological processes, on the one hand, and by other socio-spatial functions (agriculture, livestock farming, industry, residentiality, etc.), on the other. Since it is a medium of interpretation of the territory, a TTS does not directly include the totality of the territory's features, and it should not be confused with the sole sub-system of tourism activities in the strictest sense of the term. The question of its viability leads us to explore a dual form of coviability, which is both intra-territorial (having a potential for synergy and coherence of relationships with other sub-systems identifiable within the territory), and extra-territorial (dependence on the touristic meta-system and on fluctuations in its environment). Numerous case studies linked to ongoing research, mainly concerning mountain areas, are taken to illustrate this dual coviability and explain the factors that influence the time lags between the changes in tourist modalities and those of other territorial modalities.

The oases of Northern Africa, rich and complex but also fragile, have lasted for centuries and thus demonstrated their longevity. Today, how can we position their future in a context of significant environmental and social change? In order to address the notions of viability and coviability, it is necessary to verify the study's systemic context. The hypothesis that an oasis system exists has thereby been tested and the analytical inferences discussed. It uses the systemic approach and relies on reasoning by compartmentalization which is useful in the case of complex systems. Through a dual compartment/system vision, it is possible to address the trajectory of the North African oases, presented here as territorial compartments, to discuss their systemic coherence and thus question their future. This work illustrates a generic approach in order to understand the society-environment relationship. It provides the suitable systemic level for governance targeting systemic viability and coviability.

Ethnoecology attempts to understand how societies interact with their environment by focusing in particular on the processes of ecological knowledge constructions. These processes are part of a particular socio-cultural context, and they are the result of numerous interactions with non-human elements of the environment such as animals, plants, landscapes, artifacts, and so on. Local knowledge, as it is often called, is constantly renewed through daily relations. It constitutes a privileged indicator of environmental changes, and it allows societies to adjust their behavior within ecological and socio-cultural frameworks, which are more or less restrictive but relatively dynamic. Studying ecological knowledge, its dynamism, and the dynamism and implementation of the ecological and socio-cultural frameworks assist in sketching coviability models. The latter are considered as temporary and renewed adjustments of societies and their environment, adjustments that do not compromise the sustainability of their relationship and which emanate essentially from negotiation processes.

In a context of global change, the human relationship to the land - comprising as well a connection to its natural resources - increasingly defines a key challenge to human and environmental security, which pertains to the socio-ecological unit (socio-ecosystem) of man to his environment. Indeed, from this relationship materializes an ecological dimension on which the humanity depends for its existence, well-being, health, and development. In other terms, human societies rely on a life-support, that is the land which forms the "territory" and the natural resources which sustain human lives. Current pressures on land, including the land grabbing phenomenon, that are growing worldwide and particularly in Africa, place the land issue at the heart of the human and environmental security (through many problems such as food insecurity and climate change induced displacements or 'climate refugees'). This issue is even considered as one of the main drivers of many current and potential violent conflicts. The human relationship to the land and its resources, and the resulting consequences, depend on how they are supported by relevant laws. The reason is that land-related laws are not subject to a unique thought since they are plural and diversified worldwide. Based on this, and by perceiving legal systems in 'paradigmatic' terms, this chapter places side by side two exclusive legal perspectives on the human relationship to the land and its resources due to the cultural diversity which is still present and expressed worldwide despite the claims of the dominant discourse: In a first stage, the 'property' paradigm is thoroughly analyzed, allowing its foundations to come to the fore; this leads us to the second stage which deals with a 'territorial' paradigm constructed within a logic of social reproduction relating to the law of utilities (cultural, socio-cognitive, economic and political).

International audience

International audience

International audience

International audience; Présenter les défis scientifiques et les enjeux sociétaux des aires marines protégées a permis de mettre en évidence certaines problématiques inhérentes à la multiplication sans précédent de ces aires marines protégées. L’ambition de cet ouvrage était d’exposer, de la manière la plus objective possible, les avantages,inconvénients et éventuels risques de ce développement d’espaces naturels protégés en mer.À l’instar des aires protégées terrestres, il est toujours tentant de chercher à comparer les zones protégées à celles qui ne le sont pas et de mettre en opposition les zones marines classées avec celles ne bénéficiant d’aucune protection. L’une est-elle systématiquement mieux protégée que l’autre ? Les première sont-elles vocation à servir de laboratoire expérimental pour les secondes (AUBERTIN et RODARY, 2008) ? En tout état de cause, la protection des socio-écosystèmes nécessite à la fois des recherches issues des sciences naturelles et d’analyses en termes de gouvernance. Les travaux présentés dans cet ouvrage ont permis de démontrer que des controverses et difficultés d’application existent, mais qu’elles ne doivent pas diminuer l’importance des aires marines protégées, notamment pour la résilience des écosystèmes face aux pressions anthropiques et au changement climatique. Car, au-delà de l’écosystème concerné par la réglementation de l’AMP, la mise en place d’aires marines protégées a de nombreux autres effets qu’il importe de souligner.

International audience; Sous la pression de nombreuses organisations conservationnistes, le postulat de l’efficacité biologique des aires marines protégées s’est imposé : elles réduisent lamortalité des espèces cibles, améliorent l’abondance et la qualité des peuplements,favorisent la reproduction et le recrutement et vont même jusqu’à repeupler le milieuextérieur. Nombre de ces synthèses globales sur les AMP tendent à comparer dessituations très hétérogènes et sans vouloir remettre en cause l’apport positif des AMP, le chapitre de Laë et al. vise, sur des bases scientifiques rigoureuses, à mieux décrire lesprocessus de restauration, à les resituer dans le temps et dans l’espace

International audience