Gianna Minton

Gianna Minton
Independent consultant, Megaptera Marine Conservation

PhD

About

61
Publications
22,097
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1,105
Citations

Publications

Publications (61)
Conference Paper
Full-text available
The Arabian Sea Whale Network (ASWN) is an informal collaboration of researchers and conservation bodies interested in the conservation of whale populations throughout the Northern Indian Ocean
Article
The sub‐population of humpback whales inhabiting the Arabian Sea is a small and genetically distinct population that remains in low latitudes year‐round. Designated as Endangered on the IUCN Red list of Threatened Species, the sub‐population faces a number of threats throughout its range, including entanglement in fishing gear, ship strikes, diseas...
Article
Full-text available
We reviewed Coram et al. (Biodivers Conserv 30:2341–2359, 2021, https://doi.org/10. 1007/s10531-021-02196-6), a paper that highlights the use of social media data to under- stand marine litter and marine mammals in Southeast Asia. While we commend its intent, we find that the methodology used and conclusions drawn portray an incomplete and inac- cu...
Article
Full-text available
Determining which species are at greatest risk, where they are most vulnerable, and what are the trajectories of their communities and populations is critical for conservation and management. Globally distributed, wide-ranging whales and dolphins present a particular challenge in data collection because no single research team can record data over...
Article
Full-text available
The Important Marine Mammal Areas (IMMAs) initiative was launched by the Marine Mammal Protected Areas Task Force of the International Union for the Conservation of Nature in 2016, as a response to a conservation crisis in the protection of marine mammals and wider global ocean biodiversity. IMMAs identify discrete portions of habitat that are impo...
Article
As part of the Post‐2020 Biodiversity Framework, nations are assessing progress over the past decade in addressing the underlying drivers that influence direct pressures on biodiversity and formulating new policies and strategies for the decade to come. For marine conservation, global marine protected area (MPA) coverage is still falling short of t...
Chapter
The Atlantic humpback dolphin has been listed by the IUCN as Critically Endangered since 2017, and is Africa's most imperiled cetacean species. Occurring only along the Atlantic coast of Africa, its restricted geographic range, reliance on nearshore habitat, and naturally low abundance make it highly vulnerable to human activities. Known immediate...
Article
Blue whales Balaenoptera musculus in the Indian Ocean (IO) are currently thought to represent 2 or 3 subspecies ( B. m. intermedia, B. m. brevicauda , B. m. indica ), and believed to be structured into 4 populations, each with a diagnostic song-type. Here we describe a previously unreported song-type that implies the probable existence of a populat...
Article
Full-text available
Speciation is a fundamental process in evolution and crucial to the formation of biodiversity. It is a continuous and complex process, which can involve multiple interacting barriers leading to heterogeneous genomic landscapes with various peaks of divergence among populations. In this study, we used a population genomics approach to gain insights...
Technical Report
Full-text available
During the May 2019-May 2020 period, the Arabian Sea Whale Network (ASWN) has maintained communication between members and with external organisations through a website and an email group. Many ASWN members helped to identify Important Marine Mammal Areas (IMMAs) by writing proposals and participating in the IMMA workshop held in Oman in March 2019...
Article
Full-text available
Marine mammal bycatch poses a particular challenge in developing countries, where data to document bycatch and its effects are often lacking. Using the Bycatch Risk Assessment (ByRA) toolkit, based on InVEST open-source models, we chose 4 field sites in Southeast Asia with varying amounts of data on marine mammals and fishing occurrence: Trat provi...
Conference Paper
Full-text available
Arabian Sea humpback whales have been a subject of conservation concern in the IWC since 1997. Research conducted primarily off the coast of Oman has contributed to understanding the population’s distribution, abundance, and conservation status, whilst information on the population’s health and specific threats is more limited. This study examines...
Article
Full-text available
The four currently recognised species of Sousa are all threatened on the IUCN Red List. To date they have not been included in any of the available software platforms that have been developed for the automated matching of cetaceans from photo-ID data. Because of their unique morphology, existing algorithms are unlikely to be successful and new algo...
Article
Full-text available
Phylogeographic inference has provided extensive insight into the relative roles of geographical isolation and ecological processes during evolutionary radiations. However, the importance of cross-lineage admixture in facilitating adaptive radiations is increasingly being recognised, and suggested as a main cause of phylogenetic uncertainty. In thi...
Article
Abstract Formulating management strategies for mobile marine species is challenging, as knowledge is required of distribution, density, and overlap with putative threats. As a step towards assimilating knowledge, ecological niche models may identify likely suitable habitats for species, but lack the ability to enumerate species densities. Tradition...
Conference Paper
Full-text available
Bycatch is the most significant threat to cetaceans around the world. However, the magnitude of bycatch is still poorly known, particularly in certain ocean basins such as the Indian Ocean. Tuna fisheries, both industrial and small-scale, are of major socioeconomic importance throughout the Indian Ocean. Published information suggests that cetacean...
Article
Phylogeography can provide insight into the potential for speciation and identify geographic regions and evolutionary processes associated with species richness and evolutionary endemism. In the marine environment, highly mobile species sometimes show structured patterns of diversity, but the processes isolating populations and promoting differenti...
Article
Private industry, the Government of Gabon and two international NGOs collaborated to conduct marine surveys off the coast of Gabon, Central Africa. Surveys addressed multiple objectives of surveillance and monitoring, the documentation of the distribution of and threats to the marine megafauna, and capacity-building among government agents and loca...
Article
Full-text available
Understanding the horizontal and vertical habitat of olive ridley sea turtles (Lepidochelys olivacea), a threatened species, is critical for determining regions for protection and relevant gear modifications that may effectively reduce bycatch, the largest threat to this species. Satellite transmitters were used to determine the movement and dive b...
Article
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The description of genetic population structure over a species’ geographic range can provide insights into its evolutionary history and also support effective management efforts. Assessments for globally distributed species are rare, however, requiring significant international coordination and collaboration. The global distribution of demographica...
Article
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Elucidating patterns of population structure for species with complex life histories, and disentangling the processes driving such patterns, remains a significant analytical challenge. Humpback whale (Megaptera novaeangliae) populations display complex genetic structures that have not been fully resolved at all spatial scales. We generated a data s...
Chapter
Irrawaddy dolphins, Orcaella brevirostris, in the Kuching Bay, Sarawak, Malaysia have been subjected to pressure from cetacean-fisheries interactions, dolphin watching tourism and coastal development. However, very little information is known about their ecology and factors driving their habitat preferences. To obtain critical information on the di...
Conference Paper
Full-text available
Cetacean surveys using line-transect and photo-identification methodology were conducted in Kuching Bay, Sarawak, Malaysia from March through September, 2011 and 2012 and from March through May 2013. During surveys fishing vessels and fishing effort were recorded to quantify the scale of artisanal fisheries in the bay. A total of 3670 km and 248 ho...
Article
Full-text available
Indo-Pacific humpback dolphins (Sousa chinensis) are documented from various locations along Borneo's coast, including three sites in Sarawak, Malaysia, three sites in Sabah, Malaysia, three locations in Kalimantan, Indonesia and the limited coastal waters of the Sultanate of Brunei. Observations in all these areas indicate a similar external morph...
Article
Full-text available
(Received 26 August 2014; accepted 21 November 2014) The presence of tattoo-like skin disease is reported in an endangered, non-migratory subpopulation of humpback whales (Megaptera novaeangliae) from Oman. We examined 522 images taken during small-boat surveys in the Gulf of Masirah and in Dhofar in 2000-2006 and in 2010-2011. Tattoo-like lesions...
Article
Full-text available
A clear understanding of population structure is essential for assessing conservation status and implementing management strategies. A small, non-migratory population of humpback whales in the Arabian Sea is classified as “Endangered” on the IUCN Red List of Threatened Species, an assessment constrained by a lack of data, including limited understa...
Article
Full-text available
The presence of cutaneous nodules is reported in vulnerable populations of Irrawaddy dolphins Orcaella brevirostris from Malaysia (Kuching, Bintulu-Similajau, Kinabatangan-Segama and Penang Island), India (Chilika Lagoon) and Bangladesh (Sundarbans). Approximately 5700 images taken for photo-identification studies in 2004 to 2013 were examined for...
Article
Full-text available
The conservation of humpback dolphins, distributed in coastal waters of the Indo-West Pacific and eastern Atlantic Oceans, has been hindered by a lack of understanding about the number of species in the genus (Sousa) and their population structure. To address this issue, we present a combined analysis of genetic and morphologic data collected from...
Article
Full-text available
Both historic whaling data and recent field research confirm the presence of a resident sub-population of humpback whales in the western Arabian Sea (Breeding Stock X). This endangered population is geographically, demographically and genetically isolated and is thought to have been greatly reduced in size by Soviet whaling in 1966; it likely remai...
Article
Full-text available
The 2010 report of the Scientific Committee (IWC/62/Rep 1) expressed grave concern for the resident ‘Arabian Sea humpback whale population’. The Committee made strong recommendations for additional research to monitor the status of this Endangered population which has a restricted range, is reproductively isolated, has a very small population size...
Article
Full-text available
Accurate identification of units for conservation is particularly challenging for marine species as obvious barriers to gene flow are generally lacking. Bryde’s whales (Balaenoptera spp.) are subject to multiple human-mediated stressors, including fisheries bycatch, ship strikes, and scientific whaling by Japan. For effective management, a clear un...
Article
Full-text available
Small boat surveys were conducted in the Kuching Bay area of Sarawak, East Malaysia, in order to determine the distribution and abundance of coastal cetaceans. Photographic data collected from Jul.2007 through Oct.2010 was used to generate mark-recapture abundance estimates of Irrawaddy dolphins in the study area, and provided insights into ranging...
Data
##Assembly-Data-START## Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Article
Full-text available
Small boat surveys were conducted in the Kuching Bay area of Sarawak, East Malaysia, in order to determine the distribution and abundance of coastal cetaceans. Photographic data collected from Jul.2007 through Oct.2010 was used to generate mark-recapture abundance estimates of Irrawaddy dolphins in the study area, and provided insights into ranging...
Data
##Assembly-Data-START## Assembly Method :: Geneious v. 5.3.5. Sequencing Technology :: Sanger dideoxy sequencing ##Assembly-Data-END##
Article
Community workshops were held in coastal locations in Sarawak to raise awareness of cetacean conservation. Interviews were conducted up to 2 years later in four “workshop communities” as well as four villages where workshops were not conducted. Comparison of responses between respondents who had attended workshops (n = 127) versus those who had not...
Article
Full-text available
This study examined the stomach contents of 11 bottlenose dolphins (Tursiops sp.), five Indo-Pacific humpback dolphins (Sousa chinensis) and two spinner dolphins (Stenella longirostris) that were found stranded along the Omani coastline. Across the three species examined, a total of 4796 fish otoliths and 214 cephalopod beaks were found, representi...
Article
Full-text available
Habitat models are tools for understanding the relationship between cetaceans and their environment, from which patterns of the animals space use can be inferred and management strate- gies developed. Can working with space use alone be sufficient for management, when habitat can- not be modeled? Here, we analyzed cetacean sightings data collected...
Article
Full-text available
Genetic analyses of population structure can be placed in explicit environmental contexts if appropriate environmental data are available. Here, we use high-coverage and high-resolution oceanographic and genetic sequence data to assess population structure patterns and their potential environmental influences for humpback dolphins in the Western In...
Article
Full-text available
Between June 2008 and September 2009, 56 days of small boat surveys were conducted off the coast of Sarawak, Malaysia with the aim of recording cetacean distribution. These surveys, which focused on the Miri, Bintulu-Similajau and Kuching regions, comprised 173 hours of survey effort and covered 2851 km of pre-determined systematic tracks. Surveys...
Article
Full-text available
Previously published data on the occurrence of humpback whales (Megaptera novaeangliae) in the Arabian Sea suggests that the region hosts a non-migratory population that adheres to a Northern Hemisphere breeding cycle. In order to investigate the distribution and abundance of this population, twelve small boat surveys were conducted in three main l...
Article
Small boat surveys were conducted between 2000 and 2003 in three main regions of Oman's coastal waters: Muscat, the Gulf of Masirah and Dhofar. Survey data were analysed to calculate relative abundances of the seven most frequently encountered species in these areas. These include (in order of frequency) bottlenose dolphins (Tursiops sp.), long-bea...
Article
Full-text available
The photo-identification catalogue of humpback whale tail flukes from Oman was compared with those from Antongil Bay, Madagascar and study sites in South Africa and Mozambique collectively termed the 'East African Mainland'. No matches were found, supporting other lines of evidence that the humpback whales studied off the coast of Oman form part of...
Article
Full-text available
Although humpback whales are among the best-studied of the large whales, population boundaries in the Southern Hemisphere (SH) have remained largely untested. We assess population structure of SH humpback whales using 1,527 samples collected from whales at fourteen sampling sites within the Southwestern and Southeastern Atlantic, the Southwestern I...
Article
Full-text available
Certain populations of killer whales Orcinus orca feed primarily or exclusively on marine mammals. However, whether or not baleen whales represent an important prey source for killer whales is debatable. A hypothesis by Springer et al. (2003) suggested that overexploitation of large whales by industrial whaling forced killer whales to prey-switch f...
Article
Full-text available
Certain populations of killer whales (Orcinus orca) feed primarily or exclusively on marine mammals. However, whether baleen whales represent an important prey source for killer whales is debatable. A hypothesis by Springer et al. (2003) suggested that overexploitation of large whales by industrial whaling forced killer whales to prey-switch from b...
Article
Full-text available
Records of Indo-Pacific humpback dolphin sightings, strandings, and museum specimens in the Arabian region were compiled and used to review the distribution and status of this species. Nominal usage of Sousa chinensis (Osbeck, 1765) has been retained as a pragmatic measure, although the species present in the region resembles Sousa plumbea (Cuvier,...
Conference Paper
Full-text available
Data are presented on beach cast cetaceans recorded in central and southern Oman between January 1999 and February 2000 during systematic beach surveys. Crude encounter rates of cetacean specimens are comparable with previous published data and indicate relatively high levels of mortality of Tursiops sp. and Sousa plumbea. Over two-thirds of specim...
Article
Full-text available
Humpback whales in the Arabian Sea present a possibly unique exception to the seasonal migrations typical of this species. Early sightings were thought to be Southern Hemisphere whales extending their migration north of the equator. Several sources of evidence have questioned this hypothesis, suggesting that at least some whales may be year-round r...

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Projects (4)
Project
To support research and conservation projects that I was directly involved with in the past, through assistance with data analysis, report writing, grant applications, project development and awareness-raising materials.