Peter Dennis

Peter Dennis
Aberystwyth University | AU · Institute of Biological, Environmental and Rural Sciences

About

147
Publications
26,407
Reads
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3,204
Citations
Additional affiliations
November 2014 - January 2016
Aberystwyth University
Position
  • Reader in Ecology of Grazed Ecosystems

Publications

Publications (147)
Article
Full-text available
Conversion of semi-natural habitats, such as field margins, fallows, hedgerows, grassland, woodlots and forests, to agricultural land could increase agricultural production and help meet rising global food demand. Yet, the extent to which such habitat loss would impact biodiversity and wild species is unknown. Here we survey species richness for fo...
Article
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PurposeInclusion of biodiversity as an indicator in the land use impact pathway of Life Cycle Assessment (LCA) is essential to assess the effects of human activities on the environment. Numerous models have been applied, but validations that use actual data, collected in the field, are scarce. Methods The expert system SALCA-BD (Swiss Agricultural...
Article
Reactive nitrogen (N) deposition can affect ecosystem processes, particularly in oligotrophic upland habitats. Phosphorus (P) addition has been proposed to reduce the effects of N enrichment on N leaching and acidification, since P limitation can reduce biomass production and consequent sequestration of reactive N. However, biodiversity is often re...
Article
Reactive nitrogen (N) deposition can affect many ecosystem processes, particularly in oligotrophic habitats, and is expected to affect soil C storage potential through increases in microbial decomposition rate as a consequence of greater N availability. Increased N availability may also result in changes in the principal limitations on ecosystem pr...
Article
Habitat descriptors are cost effective biodiversity indicators demanded by stakeholders and required for regional and global biodiversity monitoring. We mapped 195 farms of different types in twelve case study regions across Europe and tested 18 habitat descriptors for scientific validity, information content and ease of interpretation. We propose...
Article
Promoting replication of models is unarguably a positive step for agent based modelling, as replication promotes rigorous testing. Model replication remains rare, yet is vital to assessing the repeatability of existing agent based models. Notably, more work is needed to assess cross platform and language replication, which represent potential sourc...
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Farmland is a major land cover type in Europe and Africa and provides habitat for numerous species. The severe decline in farmland biodiversity of the last decades has been attributed to changes in farming practices, and organic and low-input farming are assumed to mitigate detrimental effects of agricultural intensification on biodiversity. Since...
Conference Paper
Reactive nitrogen (N) deposition can significantly affect ecosystem processes, particularly in the oligotrophic upland ecosystem. Phosphorus (P) limitation may significantly constrain ecosystem productivity, yet ecosystem responses to P availability in instances of high N deposition are poorly understood. The release from P limitation can increase...
Book
Wild bees, spiders, earthworms and plants contribute considerably to biodiversity in grasslands and provide valuable services to agriculture, such as pollination, pest control and maintenance of soil quality. We investigated the responses of these four taxa to geographic location, practices and surrounding landscape variables using a dataset of 357...
Article
Summary 1. To evaluate progress on political biodiversity objectives, biodiversity monitoring provides information on whether intended results are being achieved. Despite scientific proof that monitoring and evaluation increase the (cost) efficiency of policy measures, cost estimates for monitoring schemes are seldom available, hampering their inc...
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Climate change has the capacity to alter physical and biological ecosystem processes, jeopardizing the survival of associated species. This is a particular concern in cool, wet northern peatlands that could experience warmer, drier conditions. Here we show that climate, ecosystem processes and food chains combine to influence the population perform...
Article
Full-text available
Climate change has the capacity to alter physical and biological ecosystem processes, jeopardising the survival of associated species. This is a particular concern in cool, wet northern peatlands that could experience warmer, drier conditions. Here we show that climate, ecosystem processes and food chains combine to influence the population perform...
Article
Wild bees, spiders, earthworms and plants contribute considerably to biodiversity in grasslands and fulfil vital ecological functions. They also provide valuable services to agriculture, such as pollination, pest control and maintenance of soil quality. We investigated the responses of wild bees, spiders, earthworms and plants to geographic locatio...
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2015. The cascading impacts of livestock grazing in upland ecosystems: a 10-year experiment. Ecosphere 6(3):42. Abstract. Livestock grazing is a major driver of land-use change, causing significant biodiversity loss globally. Although the short-term effects of livestock grazing on individual species are well studied, a mechanistic understanding of...
Article
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The effect of experimental livestock grazing regimens (4 treatments×6 replicates) on spiders via habitat structure and prey abundance was investigated on sub-montane habitats in the Southern Highlands of Scotland. The study, 2002–2004 included a baseline survey under the prior, commercial sheep grazing regimen and two assessments of spider assembla...
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Forty percent of the EU land area is currently considered to be agriculturally managed (utilised agricultural area - UAA - Eurostat Agricultural Census 2010), and attention to the environmental performance of farming practices is growing. To determine the performance of agricultural practices, farm-scale monitoring programmes are required but their...
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Agrobiodiversity plays a fundamental role in guaranteeing food security. However, still little is known about the diversity within crop and livestock species: the genetic diversity. In this paper we present a set of indicators of crop accession and breed diversity for different farm types at farm-level, which may potentially supply a useful tool to...
Article
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Fourty percent of the EU land area is currently considered to be agriculturally managed, and there is growing attention to the environmental performance of farming practices. This involves the need for farm-scale monitoring programmes for sustainability, but their implementation is ampere by a number of difficulties such as the identification of in...
Article
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Organic farming is promoted to reduce environmental impacts of agriculture, but surprisingly little is known about its effects at the farm level, the primary unit of decision making. Here we report the effects of organic farming on species diversity at the field, farm and regional levels by sampling plants, earthworms, spiders and bees in 1470 fiel...
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About one-third of the world’s land surface is used for farming, a fact that bears important implications for biodiversity. In Europe, for instance, an estimated 50 percent of all wild species are reliant on agricultural habitats, while agricultural productivity often depends on the presence or absence of particular species. Despite this close coup...
Article
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In agricultural landscapes farmers have a large impact on biodiversity through the management decisions they apply on their fields. Farmers? perception on biodiversity and its values is one of the main factors that can influence their willingness to apply biodiversity friendly farming practices. The results of a discourse-based, deliberative biodiv...
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Dans le cadre du projet européen BIOBIO, nous avons comparé entre pays les richesses en habitats et richesses spécifiques cumulées de quatre groupes taxonomiques (plantes, abeilles sauvages, araignées, vers de terre), de 169 exploitations biologiques ou conventionnelles appartenant à 10 pays. Pour le cas d’étude français, Vallées et Coteaux de Gasc...
Article
Full-text available
In Brief About one-third of the world's land surface is used for farming, a fact that bears important implications for biodiversity. In Europe, for instance, an estimated 50 percent of all wild species are reliant on agricultural habitats, while agricultural productivity often depends on the presence or absence of particular species. Despite this c...
Conference Paper
Organic and low-input farming systems provide habitats for wildlife on farmland. The EU FP7 project BIOBIO has identified a core set of 23 indicators relating to the diversity of habitats, of species, of crops and of livestock. Management indicators capturing the pressure on biodiversity are also proposed. The indicators were identified in an itera...
Conference Paper
Full-text available
One of the aims of organic farming is the protection of biodiversity. In the EU FP7 project BioBio, we studied the effect of organic farming on species numbers at farm level on 169 randomly selected organic and non-organic farms with mostly low to medium intensity in ten European regions. Using a preferential sampling scheme based on habitat mappin...
Conference Paper
Genetic variability is the fundament of life. Large genetic variability within species is the basis for adaptation to changing environmental conditions. Farmers and breeders have developed a multitude of crop cultivars and animal breeds to stabilize and increase quality and productivity. This study evaluated genetic diversity within different organ...
Book
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The report that lies before you summarises the lessons learnt from the EU FP7 Research Project BioBio (Biodiversity indicators for organic and low-input farming systems, KBBE- 227161) conducted between 2009 and 2012. The report is aimed at stakeholders and potential users of the indicator set resulting from this research, and is structured as follo...
Article
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This report describes the methods required to measure the direct and indirect indicators of biodiversity in the field or through farmer interviews on organic, low-input and conventional farms.
Technical Report
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This Handbook describes the methods required to measure the direct and indirect indicators of biodiversity in the field or through farmer interviews on organic, low-input and conventional (control) farms during 2010. It is the result of editing and revision of the BIOBIO deliverable D2.2. A total of twelve Case Study regions were selected in eleven...
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Teaching Cycle 1 - Introducing Variation and Active Learning into Lectures of the Wildlife Management Module
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Key Words: Science, IBERS, Formative Assessment, Field Course, Deep Learning, Independent Learning, Shallow Learning
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Key Words: Science, IBERS, Active Learning, Large Group, Effective Engagement, Interactive Quiz, PowerPoint
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The capacity of peatlands in the northern hemisphere to provide carbon storage, maintain water quality and support northern biodiversity is threatened by a combination of climate change and inappropriate land management. Historical drainage and increasing temperatures threaten the maintenance of the high water tables required for effective peatland...
Article
Question: Few long-term studies exist with integrated vegetation and soil composition data, coupled with detailed environmental driver records. Can changes in community composition in an upland grassland be identified by revisitation after a 40-year period and allow the main environmental drivers of change to be identified? Location: Snowdon, Wales...
Article
Farmland biodiversity is an important component of Europe?s biodiversity. More than half the continent is occupied by agricultural lands. They host specific habitats and species, which ? in addition to their conservation values they provide ? perform vital ecological functions. Indicators are needed to enable the monitoring of biodiversity at the f...