Nick J. B. Isaac
University College London
Publications 100
Here, we determine annual estimates of occupancy and species trends for 5,293 UK bryophytes, lichens, and invertebrates, providing national scale information on UK biodiversity change for 31 taxonomic groups for the time period 1970 to 2015. The dataset was produced through the application of a Bayesian occupancy modelling framework to species occurrence records supplied by 29 national recording schemes or societies (n = 24,118,549 records). In the UK, annual measures of species status from fine...
#1Gary D. PowneyH-Index: 11
#2Claire CarvellH-Index: 22
Last.Nick J. B. IsaacH-Index: 35
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Pollination is a critical ecosystem service underpinning the productivity of agricultural systems across the world. Wild insect populations provide a substantial contribution to the productivity of many crops and seed set of wild flowers. However, large-scale evidence on species-specific trends among wild pollinators are lacking. Here we show substantial inter-specific variation in pollinator trends, based on occupancy models for 353 wild bee and hoverfly species in Great Britain between 1980 an...
16 CitationsSource
#2Mark W. LogieH-Index: 1
Last.Tom A. AugustH-Index: 12
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Species records from volunteers are a vast and valuable source of information on biodiversity for a wide range of taxonomic groups. Although these citizen science data are opportunistic and unstructured, occupancy analysis can be used to quantify trends in distribution. However, occupancy analysis of unstructured data can be resource-intensive and requires substantial expertise. It is valuable to have simple 9rules of thumb9 to efficiently assess the suitability of a dataset for occupancy analys...
1 CitationsSource
Abstract Agricultural pesticides are a key component of the toolbox of most agricultural systems and are likely to continue to play a role in meeting the challenge of feeding a growing global population. However, pesticide use has well documented and often significant consequences for populations of native wildlife. Although rigorous, regulatory processes for the approval of new chemicals for agronomic use do have limitations which may fail to identify real-world negative effects of products. He...
#1Rosie J. Lennon (Ebor: University of York)H-Index: 1
#2Nick J. B. IsaacH-Index: 35
Last.Christopher D. Brown (Ebor: University of York)H-Index: 34
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Over the last 20 years, a new group of systemic insecticides–the neonicotinoids—has gained prominence in arable systems, and their application globally has risen year on year. Previous modelling studies using long-term data have suggested that neonicotinoid application has had a detrimental impact on bird populations, but these studies were either limited to a single species or neglected to analyse specific exposure pathways in conjunction with observed population trends. Using bird abundance da...
#1Nick J. B. Isaac (UCL: University College London)H-Index: 35
#2Marta A. Jarzyna (OSU: Ohio State University)H-Index: 10
Last.Robert B. O'Hara (NTNU: Norwegian University of Science and Technology)H-Index: 6
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With the expansion in the quantity and types of biodiversity data being collected, there is a need to find ways to combine these different sources to provide cohesive summaries of species' potential and realized distributions in space and time. Recently, model-based data integration has emerged as a means to achieve this by combining datasets in ways that retain the strengths of each. We describe a flexible approach to data integration using point process models, which provide a convenient way t...
1 CitationsSource
#1Adam BakewellH-Index: 4
#2Katie E. DavisH-Index: 10
Last.Peter J. MayhewH-Index: 28
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Explaining variation in life histories remains a major challenge because they are multi-dimensional and there are many competing explanatory theories and paradigms. An influential concept in life history theory is the ’fast-slow continuum’, exemplified by mammals. Determining the utility of such concepts across taxonomic groups requires comparison of the groups’ life histories in multidimensional space. Insects display enormous species richness and phenotypic diversity, but testing hypotheses li...
#1Seirian Sumner (UCL: University College London)H-Index: 23
#2Peggy Bevan (UCL: University College London)H-Index: 1
Last.Nick J. B. Isaac (UCL: University College London)H-Index: 35
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1. Ecological citizen science initiatives are growing in popularity with the increasing realisation of the potential for occurrence records to contribute information on biodiversity. However, citizen science data are justifiably criticised for misidentification, uneven sampling, incomplete detection or selective reporting. 2. Here, we test the accuracy of citizen science data for UK social wasp (Vespinae) species’ distributions. We compared data collected over two weeks by members of the public ...
1 CitationsSource
#1Nick J. B. IsaacH-Index: 35
#2Tom A. AugustH-Index: 12
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#1Stephen N. FreemanH-Index: 24
#2Nick J. B. IsaacH-Index: 35
Last.Byron J. T. MorganH-Index: 38
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Biodiversity indicators provide a powerful and convenient way to summarise extensive, complex ecological data sets and are important in influencing government policy on biodiversity and conservation. Typically, component data consist of time-varying indices for each of a number of different species. There currently exists a wide range of different biodiversity indicators, but their derivation from these indices varies and they suffer from a range of statistical shortcomings. In this paper we des...