Grant Humphries

Grant Humphries
HiDef Aerial Surveying

PhD

About

53
Publications
9,880
Reads
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615
Citations
Citations since 2017
36 Research Items
511 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Additional affiliations
September 2014 - August 2015
University of California, Davis
Position
  • PostDoc Position
March 2011 - May 2014
University of Otago
Position
  • PhD Student
May 2008 - May 2010
University of Alaska Fairbanks
Position
  • Master's Student

Publications

Publications (53)
Article
Rakiura M¯aori (New Zealand’s southernmost group of indigenous peoples) have harvested the chicks of burrow-nesting Sooty Shearwaters (T¯ıt¯ı; Puffinus griseus) for generations. As part of the harvest process, some families have maintained annual harvest diaries, some dating back to the 1950s. We used generalized boosted regression models, a machin...
Preprint
1. Animal abundance estimation is increasingly based on drone or aerial survey photography. Manual post-processing has been used extensively, however volumes of such data are increasing, necessitating some level of automation, either for complete counting, or as a labour-saving tool. Any automated processing can be challenging when using the tools...
Article
Full-text available
Gadfly petrels (genus Pterodroma) are one of the most threatened groups of birds. They are exceptionally well adapted to forage over enormous areas to maximize chances of encountering prey. Their wide-ranging travel, extensive use of oceanic habitats beyond national jurisdictions (the high seas), and limited information on their at-sea distribution...
Article
Full-text available
The application of Very-High-Resolution (VHR) satellites to survey cetaceans has gained considerable tractionover the last decade. Large whale species in particular lend themselves to detection by VHR imagery of ~0.50mresolution or less. Processing of satellite images can be manually intensive, and consequently artificial intelligencemethods are un...
Article
Full-text available
As the global environmental crisis grows in scale and complexity, conservation professionals and policymakers are increasingly called upon to make decisions despite high levels of uncertainty, limited resources, and insufficient data. Global efforts to protect biodiversity in areas beyond national jurisdiction require substantial international coop...
Article
Full-text available
Traditional methods to assess population size in seabirds are applicable only to species that nest in visible locations, leaving cryptic nocturnal, burrow-nesting seabirds underrepresented in typical long-term population monitoring programs. Alternative methods to count burrow-nesting birds, however, are extremely labor-intensive and therefore are...
Article
Full-text available
The emergence of very high-resolution (VHR) satellite imagery (less than 1 m spatial resolution) is creating new opportunities within the fields of ecology and conservation biology. The advancement of sub-meter resolution imagery has provided greater confidence in the detection and identification of features on the ground, broadening the realm of p...
Article
Full-text available
Most cetacean species are wide-ranging and highly mobile, creating significant challenges for researchers by limiting the scope of data that can be collected and leaving large areas un-surveyed. Aerial surveys have proven an effective way to locate and study cetacean movements but are costly and limited in spatial extent. Here we present a semi-aut...
Article
Full-text available
Shearwaters and petrels (hereafter petrels) are highly adapted seabirds that occur across all the world’s oceans. Petrels are a threatened seabird group comprising 124 species. They have bet-hedging life histories typified by extended chick rearing periods, low fecundity, high adult survival, strong philopatry, monogamy and long-term mate fidelity...
Data
This webpage is a scientific database where you will find official records of dive depth and duration for most diving species of vertebrates. This project was initiated to answer the questions regularly asked by school teachers, educators, journalists, scientists: "How deep can animals dive?". Such information is compiled here, using references fro...
Article
Population forecasting, in which past dynamics are used to make predictions of future state, has many real-world applications. While time series of animal abundance are often modeled in ways that aim to capture the underlying biological processes involved, doing so is neither necessary nor sufficient for making good predictions. Here we report on a...
Chapter
The application of machine learning algorithms in ecology has surged forward in the past two decades. More and more, we are seeing innovative and interesting uses of these sophisticated algorithms which are driving inference and understanding in natural resource management. The concept behind machine learning is to provide data to a computer and al...
Chapter
Full-text available
Leach’s storm-petrel (Hydrobates leucorhous), a nocturnal seabird that breeds in the Northern hemisphere, has geographically separated populations in the North Atlantic and North Pacific. Although some mixing occurs during the non-breeding season, genetic evidence demonstrates that these populations are diverging. However, genetic information for t...
Book
Ecologists and natural resource managers are charged with making complex management decisions in the face of a rapidly changing environment resulting from climate change, energy development, urban sprawl, invasive species and globalization. Advances in Geographic Information System (GIS) technology, digitization, online data availability, historic...
Chapter
The advent of the internet was arguably the most important development in modern society. It has altered nearly every aspect of modern social behavior and therefore represents one of the (if not ‘THE’) biggest changes humankind has ever experienced. The internet has shifted paradigms in thinking, particularly in science and natural resource managem...
Chapter
Web-based decision support tools that use machine learning algorithms are becoming increasingly important in our technology driven society. This is because fast access to the most recent or best information allows managers to make efficient, fact-driven decisions under certain circumstances. Web-based tools have the potential to allow managers to e...
Chapter
Massive strides have been made in the fields of machine learning and data mining with new algorithms developing at incredible rates. These advances have come along in the past two decades and have vastly changed almost every aspect of our lives. Thus, it is nearly impossible to envision what these algorithms will be like by the year 2100 (a benchma...
Chapter
Previous work has shown that sooty shearwater (Puffinus griseus) harvest data are able to predict shifts in the Southern Oscillation Index (SOI) by approximately 4–14 months. In this study, the mechanisms of this relationship are examined. The oceanographic regions in our study area that best explain variation in SOI from 1 to 12 months after peak...
Chapter
Machine learning (ML) has been established and used in science-based applications since the 1970s. The advent and maturation of mathematical algorithms and concepts like Neural Networks, Entropy, Classification and Regression Trees (CARTs), as well as the enhancement of computational power on personal computers worldwide have allowed for the develo...
Article
Full-text available
Colonially-breeding seabirds have long served as indicator species for the health of the oceans on which they depend. Abundance and breeding data are repeatedly collected at fixed study sites in the hopes that changes in abundance and productivity may be useful for adaptive management of marine resources, but their suitability for this purpose is o...
Article
Full-text available
Indices calculated from “muttonbirding” diaries collected by the Rakiura Māori of New Zealand were correlated with future values of the Southern Oscillation Index (SOI), and the Pacific Decadal Oscillation (PDO) from 1957 to 2010. Spearman correlations showed that La Niña events tended to occur after those harvest seasons with relatively high succe...
Article
The Mapping Application for Penguin Populations and Projected Dynamics (MAPPPD) is a web-based, open access, decision-support tool designed to assist scientists, non-governmental organisations and policy-makers working to meet the management objectives as set forth by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR)...
Article
Full-text available
Conferences allow researchers to present findings, exchange ideas, and develop networks. Unfortunately, they also incur high financial costs for participants and high environmental costs in the form of carbon emissions associated with air and other travel. Twitter—already popular with many
Article
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Despite their long-standing and central role in the dissemination, promotion and defense of science, scientific societies currently face a unique combination of economic, social and technological changes. As a result, one of the most pressing challenges facing many societies is declining membership due to reduced recruitment and a failure to retain...
Article
Full-text available
The at-sea summertime distribution of marine mammals between South Africa and Antarctica was determined along eight transects surveyed between December 2007 and January 2012. During 1930 30-minute transect counts, 1390 marine mammal individuals were attributed to 19 species: eight toothed whales (Odontoceti), six pinnipeds, and five baleen whales (...
Article
Full-text available
It is now understood that the Ross Sea stands as one of the last relatively pristine (ocean) areas. Many decades of international research have been carried out under the Antarctic Treaty System stipulating that data acquired under this scheme must be shared with the global community. In line with Carlson (Nature 469:293, 2011, Polar Research 10.34...
Article
Full-text available
Advances in GPS tracking technologies have allowed for rapid assessment of important oceanographic regions for seabirds. This allows us to understand seabird distributions, and the characteristics which determine the success of populations. In many cases, quality GPS tracking data may not be available; however, long term population monitoring data...
Conference Paper
An organism’s activity is often linked to differences in their life histories. Previous studies have shown that fast-slow life history strategy dichotomies exist between multiple organisms and within communities of Odonate assemblages. Slow species display a sit and wait behaviour, waiting for prey to come to them, while fast species actively hunt....
Article
Full-text available
During the strong El Niños of 1982–83 and 1997–98, studies of marine life provided insight and foresight into the evolution and dissipation of these events. Top marine predators, such as seabirds, are particularly responsive to changes in oceanographic conditions during El Niño (Ainley et al., 1995) and other anomalous ocean conditions (Sydeman et...
Article
Full-text available
About 90% of the global population of Streaked Shearwaters Calonectris leucomelas breed on islands in the seas around Japan. The species’s status and distribution in Japan is fairly well documented, but for the Korean part of the breeding range, only limited information in Korean language sources exists. The species was first described in Korea in...
Article
AimsTo use open access models of predicted seabird distribution data in the Arctic to create rapid assessment biodiversity maps for management purposes and for prioritization of conservation. LocationHigh Arctic, North of 60° latitude. Methods The predicted distributions of 27 species of Arctic seabirds were combined to create a seabird biodiversit...
Article
Full-text available
The common raven (Corvus corax) is an abundant generalist of the northern hemisphere, known to congregate and roost near human-related food sources. Due to a growing human-footprint and associated anthropogenic food subsidies, raven populations have increased dramatically over the past several years throughout the USA. The sub-arctic region has als...
Article
Full-text available
The first aim of our long-term study on the at-sea distribution of the upper trophic levels—seabirds and marine mammals—in polar marine ecosystems is to identify the main factors affecting their distribution: water masses and pack ice, fronts and ice edge as defined on the basis of water temperature, salinity and ice overage. In this study, seabird...
Article
Full-text available
Storm-petrels have been shown to use dimethyl sulfide (DMS) as a foraging cue, suggesting that this compound may be used to predict their distribution. We describe a new distribution model that employs machine learning software and geographic information systems to model storm-petrel distribution. We used environmental predictor variables that incl...
Article
Full-text available
The climatically-important compound dimethylsulfide (DMS) has been reported to be abundant in the Arctic, particularly in the marginal sea ice zone. Due to these high concentrations, it may play an important role in climate control. A DMS monthly climatology for July through October was created employing various ocean characteristics and spatial mo...
Article
Full-text available
A dynamic model is constructed for interactive silicon, nitrogen, sulfur processing in and below Arctic sea ice, by ecosystems residing in the lower few centimeters of the distributed pack. A biogeochemically active bottom layer supporting sources/sinks for the pennate diatoms is appended to thickness categories of a global sea ice code. Nutrients...
Chapter
Full-text available
The Arctic is a delicate and changing ecosystem that is home to a variety of species, many of which are threatened. With the opening of the Northwest Passage as the result of an increasingly iceless Arctic, political and economic pressures will inevitably have impacts directly affecting wildlife and habitats. Seabirds that nest on Arctic islands an...
Article
We present a first compilation, quantification and summary of 27 seabird species presence data for north of the Arctic circle (>66 degrees latitude North) and the ice-free period (summer). For species names, we use several taxonomically valid online databases [Integrated Taxonomic Information System (ITIS), AviBase, 4 letter species codes of the Am...

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Projects (3)