Historical data reveal power-law dispersal patterns of invasive aquatic species

Understanding how invasive species spread is of particular concern in the current era of globalisation and rapid environmental change. The occurrence of super-diffusive movements within the context of Lévy flights has been discussed with respect to particle physics, human movements, microzooplankton, disease spread in global epidemiology and animal foraging behaviour. Super-diffusive movements provide a theoretical explanation for the rapid spread of organisms and disease, but their applicability to empirical data on the historic spread of organisms has rarely been tested. This study focuses on the role of long-distance dispersal in the invasion dynamics of aquatic invasive species across three contrasting areas and spatial scales: open ocean (north-east Atlantic), enclosed sea (Mediterranean) and an island environment (Ireland). Study species included five freshwater plant species, Azolla filiculoides, Elodea canadensis, Lagarosiphon major, Elodea nuttallii and Lemna minuta; and ten species of marine algae, Asparagopsis armata, Antithamnionella elegans, Antithamnionella ternifolia, Codium fragile, Colpomenia peregrina, Caulerpa taxifolia, Dasysiphonia sp., Sargassum muticum, Undaria pinnatifida and Womersleyella setacea. A simulation model is constructed to show the validity of using historical data to reconstruct dispersal kernels. Lévy movement patterns similar to those previously observed in humans and wild animals are evident in the re-constructed dispersal pattern of invasive aquatic species. Such patterns may be widespread among invasive species and could be exacerbated by further development of trade networks, human travel and environmental change. These findings have implications for our ability to predict and manage future invasions, and improve our understanding of the potential for spread of organisms including infectious diseases, plant pests and genetically modified organisms.

Seeds of growth? Agricultural productivity and the transitional dynamics of the Ramsey model

A two-sector Ramsey-type model of growth is developed to investigate the relationship between agricultural productivity and economy-wide growth. The framework takes into account the peculiarities of agriculture both in production ( reliance on a fixed natural resource base) and in consumption (life-sustaining role and low income elasticity of food demand). The transitional dynamics of the model establish that when preferences respect Engel's law, the level and growth rate of agricultural productivity influence the speed of capital accumulation. A calibration exercise shows that a small difference in agricultural productivity has drastic implications for the rate and pattern of growth of the economy. Hence, low agricultural productivity can form a bottleneck limiting growth, because high food prices result in a low saving rate.

Agricultural tenancies: implied surrender and regrant and the operation of the Agricultural Tenancies Act 1995

Agricultural tenancies arising after 1st September 1995 are mostly governed by the Agricultural Tenancies Act 1995. As such, tenants under this Act do not benefit from the degree of protection conferred on tenancies already in existence, which remain under the Agricultural Holdings Act 1986. Section 4 of the 1995 Act seeks to protect those tenancies which subsequently inadvertently undergo a surrender and regrant and which would otherwise lose the protection of the 1986 Act. This paper seeks to investigate, by relating recent case law and statute to the situation of agricultural tenancies, the occasions where surrender and regrant might occur and whether in such instances the protection of the 1986 Act will be lost.

Commentary on an example of a tenancy agreement for an agricultural holding

This paper sets out an example of a standard agricultural tenancy, being one creating a tenancy from year to year and consequently covered by the agricultural holdings legislation. A facing-page commentary gives a clause-by-clause analysis of the agreement, the implications of each provision being discussed in the light of the law of contract, agricultural holdings legislation and, where appropriate, subsequent caselaw.

Market transparency and collusion: on the UK agricultural tractor registration exchange

We review the decision by the European Commission in the case of the UK Agricultural Registration Exchange. We propose a theoretical model, offering a basis for some of the intuitive arguments used by the Commission on the anti-competitive role of information exchange in the case of price and non price collusion. Market transparency on non price data is shown to be a collusion facilitating device which may achieve stability in otherwise unstable cartels.

Governance, agricultural intensification and land sparing in tropical South America

In this paper we address two topical questions: How do the quality of governance and agricultural intensification impact on spatial expansion of agriculture? Which aspects of governance are more likely to ensure that agricultural intensification allows sparing land for nature? Using data from the Food and Agriculture Organization, the World Bank, the World Database on Protected Areas, and the Yale Center for Environmental Law and Policy, we estimate a panel data model for six South American countries and quantify the effects of major determinants of agricultural land expansion, including various dimensions of governance, over the period 1970–2006. The results indicate that the effect of agricultural intensification on agricultural expansion is conditional on the quality and type of governance. When considering conventional aspects of governance, agricultural intensification leads to an expansion of agricultural area when governance scores are high. When looking specifically at environmental aspects of governance, intensification leads to a spatial contraction of agriculture when governance scores are high, signaling a sustainable intensification process.

Trade Law and Responsible Investment

There is broad international agreement that investment flows to the agricultural sector in developing countries need to be increased. In addition, there is broad agreement that such investments need to be responsible, and that they will only be responsible and beneficial to poor people if they contribute to the prudent development of the agricultural sector. Less studied is the link between responsible investment and trade. In this brief, the assumption is made that responsible investment flows presume a responsible trade regime, i.e. a trade regime that contributes to the prudent development of the agricultural sector in developing countries. Such a prudent, sustainable trade regime will promote investments in the agricultural sector that are responsible to the people involved and to the environment. It builds the “channel” through which investments flow. By contrast, an unsustainable trade framework will create an investment climate that promotes problematic investment practices.

Agricultural land use and biodiversity in the Alps - How cultural tradition and socioeconomically motivated changes are shaping grassland biodiversity in the Swiss Alps

Alpine grasslands are ecosystems with a great diversity of plant species. However, little is known about other levels of biodiversity, such as landscape diversity, diversity of biological interactions of plants with herbivores or fungal pathogens, and genetic diversity. We therefore explored natural and anthropogenic determinants of grassland biodiversity at several levels of biological integration, from the genetic to the landscape level in the Swiss Alps. Differences between cultural traditions (Romanic, Germanic, and Walser) turned out to still affect land use diversity and thus landscape diversity. Increasing land use diversity, in turn, increased plant species diversity per village. However, recent land use changes have reduced this diversity. Within grassland parcels, plant species diversity was higher on unfertilized mown grasslands than on fertilized or grazed ones. Most individual plants were affected by herbivores and fungal leaf pathogens, reflecting that parcels harbored a great diversity of herbivores and pathogens. However, as plant damage by herbivores and pathogens was not severe, conserving these biological interactions among plants is hardly compromising agricultural goals. A common-garden experiment revealed genetic differentiation of the important fodder grass Poa alpina between mown and grazed sites, suggesting adaptation. Per-village genetic diversity of Poa alpina was greater in villages with higher land use diversity, analogous to the higher plant species diversity there. Overall, landscape diversity and biodiversity within grassland parcels are currently declining. As this contradicts the intention of Swiss law and international agreements, financial incentives need to be re-allocated and should focus on promoting high biodiversity at the local and the landscape level. At the same time, this will benefit landscape attractiveness for tourists and help preserve a precious cultural heritage in the Swiss Alps.

A Preliminary Impact Assessment of Doha Round Results on Agricultural Policies in Turkey

Turkish agriculture has been experiencing a period of unique policy experiment over the last couple years. A World Bank-initiated project, called the Agricultural Reform Implementation Project (ARIP), has been at the forefront of policy change. It was initially promoted by the Bank as an exemplary reform package which could also be adopted by other developing countries. It was introduced in 2001 as part of a major International Monetary Fund (IMF)/World Bank-imposed program of “structural adjustment” after the country had been hit by a major financial crisis. The project has finally come to an end in 2009, and there is now an urgent need for a retrospective assessment of its overall impact on the agricultural sector. Has it fulfilled its ambitious objective of reforming and restructuring Turkish agriculture? Or should it be recorded as a failure of the neo-liberal doctrine? This book aims at finding answers to these questions by investigating the legacy of ARIP from a multi-disciplinary perspective.

Market Access in Switzerland and in the European Union for Agricultural Products from Least Developed Countries

The introduction of the so-called “duty free quota free” treatment (DFQF) for all products from least developed countries (LDCs), in particular by the European Communities (EC) and by Switzerland, raised expectations of increased agricultural exports for these 49 countries. Despite the high tariff differential LDCs now enjoy over their competitors, especially for agricultural products and particularly in Switzerland, the results until 2007 are dismal: with the exception of sugar exports to the EC, LDCs have not been able to substantially increase their agricultural exports to Europe. This study analyses the result-ing tariff situation and the remaining non-tariff barriers. In many instances it is not cus-toms duties but the sanitary and phytosanitary barriers which turn out to be the single most important hurdle preventing trade. For instance, almost no LDC-based company can supply animal-based products. Similarly, certain private standards set by proces-sors and retailers prevent imports, particularly from LDCs, far more effectively than tar-iffs. Several gateways into this “European cordon sanitaire” are proposed. Only if offered in the context of a package of various carefully coordinated measures, DFQF could yet have a real impact on trade from LDCs. As it stands, this treatment constitutes only a nice-to-have but still largely ineffective instrument of trade development.

An Enabling Regulatory Environment for Sustainable Investment: The Example of Trade Law

There is broad international agreement that investment flows to the agricultural sector in developing countries need to be increased. But there is also agreement that such investments need to be sustainable. For being sustainable, they must not only be beneficial to the public economy, but also to rural households and to the environment in the short and the long run. Whether sustainable investments take place, not least depends on the legal framework within which these investments are situated. This is true for the domestic legal frameworks of both the home country and of the host country of the investment. But also the international legal frameworks in which home and host states are embedded set either positive or negative incentives for investments to be sustainable. The paper presents an overview on regulatory frameworks which come to focus in this regard. It then elaborates on international agricultural trade regulation, by assuming that sustainable investments in agriculture presume a ‘sustainable trade regime’. By doing so, the paper presents parts of the debate about a sustainable agricultural trade regime, as it has been resumed and further developed by the author in recent years. Key words. Agricultural sector, sustainable investment, regulatory environment, sustainable trade regime.

Sustainable development in international law making and trade: International food governance and trade in agriculture

This timely book provides an accessible insight into how the concept of sustainable development can be made operational through its translation into legal terms. Understood as a multidimensional legal principle, sustainable development facilitates coherent international law making. Using this notion as an analytical lens on the WTO Agreement on Agriculture, the book considers the unresolved question of what a sustainable and coherent agricultural trade agreement could look like.

European Criminal Law and General Principles of Union Law. Research Papers in Law, 5/2005

From the Introduction. The European Court of Justice, partly followed in this by the European legislator, has regulated Community law and policy through a set of general principles of law. For the Community legal order in the first pillar, general legal principles have developed from functional policy areas such as the internal market, the customs union, the monetary union, the common agricultural policy, the European competition policy, etc., which are of great importance for the quality and legitimacy of Community law. The principles in question are not so much general legal principles of an institutional character, such as the priority of Community law, direct effect or Community loyalty, but rather principles of law which shape the fundamental rights and basic rights of the citizen. I refer to the principle of legality, of nulla poena, the inviolability of the home, the nemo tenetur principle, due process, the rights of the defence, etc. Many of these legal principles have been elevated to primary Community law status by the European Court of Justice, often as a result of preliminary questions. Nevertheless, a considerable number of them have also been elaborated in the context of contentious proceedings before the Court of Justice, such as in the framework of European competition law and European public servants law.

A general charter for trade associations. Correspondence between the attorney general and the secretary of commerce. Permissible activities of trade associations. Text of Supreme court decision condemning certain practices. Text of act legalizing agricultural cooperative marketing associations, together with a treatise on the application of these pronouncements.

Mode of access: Internet.

Immigration reform and agricultural labor /

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