Hedley Grantham

Dr. Hedley Grantham


Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 December 2020 in Nature Communications
Verified
Journal Article
Open access
PDF file
HGHedley Grantham
Hedley Grantham
ADA. Duncan
A. Duncan
TET. D. Evans
T. D. Evans
KJK. R. Jones
K. R. Jones
HBH. L. Beyer
H. L. Beyer
JWJames Watson
James Watson
Many global environmental agendas, including halting biodiversity loss, reversing land degradation, and limiting climate change, depend upon retaining forests with high ecological integrity, yet the scale and degree of forest modification remain poorly quantified and mapped. By integrating data on observed and inferred human pressures and an index of lost connectivity, we generate a globally consistent, continuous index of forest condition as determined by the degree of anthropogenic modification. Globally, only 17.4 million km2 of forest (40.5%) has high landscape-level integrity (mostly found in Canada, Russia, the Amazon, Central Africa, and New Guinea) and only 27% of this area is found in nationally designated protected areas. Of the forest inside protected areas, only 56% has high landscape-level integrity. Ambitious policies that prioritize the retention of forest integrity, especially in the most intact areas, are now urgently needed alongside current efforts aimed at halting deforestation and restoring the integrity of forests globally.

30 October 2021 in Global Change Biology
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Journal Article
Closed access
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PEPaul R. Elsen
Paul R. Elsen
ESEarl C. Saxon
Earl C. Saxon
Blake Alexander SimmonsBlake Alexander Simmons
Blake Alexander Simmons
MWMichelle Ward
Michelle Ward
BWBrooke Williams
Brooke Williams
JWJames Watson
James Watson

1 September 2020 in Environmental Research Letters
Verified
Journal Article
Open access
HGHedley Grantham
Hedley Grantham
Aurelie Camille ShapiroAurelie Camille Shapiro
Aurelie Camille Shapiro
DBD Bonfils
D Bonfils
VGValery Gond
Valery Gond
EGE Goldman
E Goldman
ORO Rickenbach
O Rickenbach

17 January 2025 in Biological Reviews
Verified
Journal Article
Open access
TBTom Bruce
Tom Bruce
ZAZachary Amir
Zachary Amir
BABenjamin Allen
Benjamin Allen
BABrendan F. Alting
Brendan F. Alting
MAMatt Amos
Matt Amos
MLMatthew S. Luskin
Matthew S. Luskin
Camera traps are widely used in wildlife research and monitoring, so it is imperative to understand their strengths, limitations, and potential for increasing impact. We investigated a decade of use of wildlife cameras (2012–2022) with a case study on Australian terrestrial vertebrates using a multifaceted approach. We (i) synthesised information from a literature review; (ii) conducted an online questionnaire of 132 professionals; (iii) hosted an in‐person workshop of 28 leading experts representing academia, non‐governmental organisations (NGOs), and government; and (iv) mapped camera trap usage based on all sources. We predicted that the last decade would have shown: (i) exponentially increasing sampling effort, a continuation of camera usage trends up to 2012; (ii) analytics to have shifted from naive presence/absence and capture rates towards hierarchical modelling that accounts for imperfect detection, thereby improving the quality of outputs and inferences on occupancy, abundance, and density; and (iii) broader research scales in terms of multi‐species, multi‐site and multi‐year studies. However, the results showed that the sampling effort has reached a plateau, with publication rates increasing only modestly. Users reported reaching a saturation point in terms of images that could be processed by humans and time for complex analyses and academic writing. There were strong taxonomic and geographic biases towards medium–large mammals (>500 g) in forests along Australia's southeastern coastlines, reflecting proximity to major cities. Regarding analytical choices, bias‐prone indices still accounted for ~50% of outputs and this was consistent across user groups. Multi‐species, multi‐site and multiple‐year studies were rare, largely driven by hesitancy around collaboration and data sharing. There is no widely used repository for wildlife camera images and the Atlas of Living Australia (ALA) is the dominant repository for sharing tabular occurrence records. However, the ALA is presence‐only and thus is unsuitable for creating detection histories with absences, inhibiting hierarchical modelling. Workshop discussions identified a pressing need for collaboration to enhance the efficiency, quality and scale of research and management outcomes, leading to the proposal of a Wildlife Observatory of Australia (WildObs). To encourage data standards and sharing, WildObs should (i) promote a metadata collection app; (ii) create a tagged image repository to facilitate artificial intelligence/machine learning (AI/ML) computer vision research in this space; (iii) address the image identification bottleneck via the use of AI/ML‐powered image‐processing platforms; (iv) create data commons for detection histories that are suitable for hierarchical modelling; and (v) provide capacity building and tools for hierarchical modelling. Our review highlights that while Australia's investments in monitoring biodiversity with cameras position it to be a global leader in this context, realising that potential requires a paradigm shift towards best practices for collecting, curating, sharing and analysing ‘Big Data’. Our findings and framework have broad applicability outside Australia to enhance camera usage to meet conservation and management objectives ranging from local to global scales. This review articulates a country/continental observatory approach that is also suitable for international collaborative wildlife research networks.

6 September 2021 in Global Change Biology
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Journal Article
Closed access
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LRLeslie Roberson
Leslie Roberson
HBHawthorne L. Beyer
Hawthorne L. Beyer
COCasey O’hara
Casey O’hara
JWJames Watson
James Watson
DDDaniel C. Dunn
Daniel C. Dunn
RRRebecca K. Runting
Rebecca K. Runting

26 November 2019 in Frontiers in Marine Science
Verified
Journal Article
Open access
PDF file
BTBrittany T. Trew
Brittany T. Trew
HGHedley Grantham
Hedley Grantham
CBChristian Barrientos
Christian Barrientos
TCTim Collins
Tim Collins
PDPhilip D. Doherty
Philip D. Doherty
KMKristian Metcalfe
Kristian Metcalfe
Marine biodiversity is under extreme pressure from anthropogenic activity globally, leading to calls to protect at least 10% of the world’s oceans within marine protected areas (MPAs) and other effective area-based conservation measures. Fulfilling such commitments, however, requires a detailed understanding of the distribution of potentially detrimental human activities, and their predicted impacts. One such approach that is being increasingly used to strengthen our understanding of human impacts is cumulative impact mapping; as it can help identify economic sectors with the greatest potential impact on species and ecosystems in order to prioritize conservation management strategies, providing clear direction for intervention. In this paper, we present the first local cumulative utilization impact mapping exercise for the Bioko-Corisco-Continental area of Equatorial Guinea’s Exclusive Economic Zone – situated in the Gulf of Guinea, one of the most important and least studied marine regions in the Eastern Central Atlantic. This study examines the potential impact of ten direct anthropogenic activities on a suite of key marine megafauna species and reveals that the most suitable habitats for these species, located on the continental shelf, are subject to the highest threat scores. However, in some coastal areas, the persistence of highly suitable habitat subject to lower threat scores suggests that there are still several strategic areas that are less impacted by human activity that may be suitable sites for protected area expansion. Highlighting both the areas with potentially the highest impact, and those with lower impact levels, as well as particularly damaging activities can inform the direction of future conservation initiatives in the region.