Hugh A. Graham

ORCID: 0000-0001-9451-5010
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About
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Research Areas
  • Ecology and biodiversity studies
  • Botany and Plant Ecology Studies
  • Peatlands and Wetlands Ecology
  • Remote Sensing and LiDAR Applications
  • Remote Sensing in Agriculture
  • 3D Surveying and Cultural Heritage
  • Integrated Water Resources Management
  • Wildlife Ecology and Conservation
  • Forest ecology and management
  • Geochemistry and Geologic Mapping
  • Satellite Image Processing and Photogrammetry

University of Exeter
2016-2025

Beavers are the archetypal keystone species, which can profoundly alter ecosystem structure and function through their engineering activity, most notably building of dams. This have a major impact upon water resource management, flow regimes quality. Previous research has predominantly focused on activities North American beaver (Castor canadensis) located in very different environments, to intensive lowland agricultural landscapes United Kingdom elsewhere Europe. Two Eurasian beavers fiber)...

10.1016/j.scitotenv.2016.10.122 article EN cc-by The Science of The Total Environment 2016-10-26

Abstract Beavers can profoundly alter riparian environments, most conspicuously by creating dams and wetlands. Eurasian beaver ( Castor fiber ) populations are increasing it has been suggested they could play a role in the provision of multiple ecosystem services, including natural flood management. Research at different scales, contrasting ecosystems is required to establish what extent beavers impact on regimes. Therefore, this study determines whether flow regimes responses storm events...

10.1002/hyp.14017 article EN Hydrological Processes 2020-12-21

Beavers, primarily through the building of dams, can deliver significant geomorphic modifications and result in changes to nutrient sediment fluxes. Research is required understand implications possible benefits widespread beaver reintroduction across Europe. This study surveyed depth, extent carbon/nitrogen content a sequence pond dam structures South West England, where pair Eurasian beavers (Castor fiber) were introduced controlled 1.8 ha site 2011. Results showed that 13 ponds...

10.1002/esp.4398 article EN cc-by Earth Surface Processes and Landforms 2018-04-02

Abstract Context: Forest structure is key to understanding the resilience of tropical forests (their ability recover from disturbance) and predicting how these ecosystems will respond future environmental climatic fluctuations. Current studies in Amazon rely on passive active remote sensing forest cover metrics that offer limited insight into nuanced canopy structural changes associated with degradation. The Global Ecosystem Dynamics Investigation (GEDI) spaceborne lidar provides detailed...

10.1088/1748-9326/adc752 article EN cc-by Environmental Research Letters 2025-03-31

Non-forest ecosystems, dominated by shrubs, grasses and herbaceous plants, provide ecosystem services including carbon sequestration forage for grazing, are highly sensitive to climatic changes. Yet these ecosystems poorly represented in remotely sensed biomass products undersampled situ monitoring. Current global change threats emphasize the need new tools capture non-forest at appropriate scales. Here we developed deployed a protocol photogrammetric height using unoccupied aerial vehicle...

10.1002/rse2.228 article EN cc-by Remote Sensing in Ecology and Conservation 2021-07-07

Unoccupied aerial vehicle (UAV) based structure-from-motion (SfM) photogrammetry surveys are becoming a standard tool for ecologists to measure plant structure and biomass in non-forest ecosystems. The reproducibility of SfM survey results under different operational conditions, namely wind speed, sun elevation, cloud condition, is poorly understood. It also unclear what extent commonly applied point-to-grid interpolation derived point clouds affects inference vegetation structure. These...

10.1080/01431161.2024.2377832 article EN cc-by-nc-nd International Journal of Remote Sensing 2024-07-26

Abstract Eurasian beavers, keystone species, have returned to inhabit much of its former range following near extinction. Evidence repeatedly demonstrates that beavers can provide important riparian biotic and abiotic ecosystem services. These abilities modify their surroundings cause conflict, especially in prime agricultural landscapes. Understanding how are utilizing expanding European catchments is therefore essential. This paper presents a methodology by which the spatial extent...

10.1002/rra.3755 article EN cc-by River Research and Applications 2020-12-09

Abstract Eurasian beaver ( Castor fiber ) were nearly hunted to extinction but have recovered occupy much of their former range. Beaver extirpated from Great Britain c. 400 years ago recently been reintroduced. The River Otter catchment, Devon was the site first licensed wild release beavers in England. With further releases being considered, there is a need better understand population dynamics this native, keystone species inform conservation and management. Field signs surveyed 2015 2021....

10.1002/2688-8319.12168 article EN cc-by Ecological Solutions and Evidence 2022-07-01

Beavers influence hydrology by constructing woody dams. Using a Before After Control Impact experimental design, we quantified the effects of beaver dam sequence on flow regime stream in SW England and consider mechanisms that underpin attenuation wetlands. Rainfall-driven hydrological events were extracted between 2009 2020, for impacted (

10.1002/hyp.14735 article EN cc-by Hydrological Processes 2022-10-14

Understanding the resilience of tropical vegetation, its ability to recover from disturbance, is fundamental assess future responses environmental and climatic fluctuations. The Amazon rainforest has been identified as a potential tipping element in Earth’s climate system there mounting concern over persistent degradation. Extreme events continued logging, forest fire fragmentation threaten Amazon’s structural integrity role carbon sink, with remotely sensed data...

10.5194/egusphere-egu24-18581 preprint EN 2024-03-11

Abstract Non-forest ecosystems, dominated by shrubs, grasses and herbaceous plants, provide ecosystem services including carbon sequestration forage for grazing, yet are highly sensitive to climatic changes. Yet these ecosystems poorly represented in remotely-sensed biomass products undersampled in-situ monitoring. Current global change threats emphasise the need new tools capture non-forest at appropriate scales. Here we assess whether canopy height inferred from drone photogrammetry allows...

10.1101/2020.07.16.206011 preprint EN cc-by-nc bioRxiv (Cold Spring Harbor Laboratory) 2020-07-17

<p>The connectivity of landscapes is increasingly recognised as being a key control over their hydrological function and provides valuable conceptual approach for understanding the environmental impacts return beaver to European landscapes.</p><p>Beavers are archetypal keystone species, which can profoundly alter ecosystem structure through engineering activity, most notably building dams. Beaver dams, associated ponds other structures such canals...

10.5194/egusphere-egu2020-2158 article EN 2020-03-09

Water voles (Arvicola amphibius) are critically endangered in Great Britain and there is a pressing need for successful conservation strategies. Meanwhile, another semi-aquatic rodent, the Eurasian beaver (Castor fiber) being restored to much of its native range including Britain. Beavers known as ecosystem engineers keystone species, creating wetland habitats. As part River Otter Beaver Trial South-West England, free-living beavers were reintroduced location where water vole present...

10.59922/gonl2514 article EN Mammal Communications 2023-01-01

Beavers influence hydrology by constructing woody dams. Using a before after control impact experimental design, we quantified the effects of beaver dam sequence on flow regime stream in SW England. Building upon our previous research (Puttock et al., 2021), consider mechanisms that underpin attenuation wetlands. Rainfall-driven hydrological events were extracted between 2009 and 2020, for impacted (n=612) (n=634) catchments, capturing seven years three occupancy, at site. General additive...

10.22541/au.164512384.45527808/v1 preprint EN Authorea (Authorea) 2022-02-17
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