Andrea D. Marshall
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View article: A 15‐Year Time Series Shows Major Declines in Whale Sharks in Southern Mozambique
A 15‐Year Time Series Shows Major Declines in Whale Sharks in Southern Mozambique Open
A 15‐year dataset (2005–2019) of 706 photo‐identified whale sharks ( Rhincodon typus ) off Praia do Tofo in Mozambique allowed us to assess the local abundance trend, and size‐ and sex‐specific sighting and abundance trends, using both gen…
View article: Preliminary insights into manta ray (Mobula alfredi and M. birostris) population demographics and distribution in South Africa
Preliminary insights into manta ray (Mobula alfredi and M. birostris) population demographics and distribution in South Africa Open
Both the reef manta ray, Mobula alfredi and oceanic manta ray M. birostris , are repeatedly observed in South Africa, yet little is known about the distributions of either species. In this study, we collated citizen science observations si…
View article: Killer Whale Predation on a Giant Manta Ray (<i>Mobula birostris</i>), a Sicklefin Devil Ray (<i>Mobula tarapacana</i>) and a Tiger Shark (<i>Galeocerdo cuvier</i>) in the Southwest Indian Ocean
Killer Whale Predation on a Giant Manta Ray (<i>Mobula birostris</i>), a Sicklefin Devil Ray (<i>Mobula tarapacana</i>) and a Tiger Shark (<i>Galeocerdo cuvier</i>) in the Southwest Indian Ocean Open
Knowledge of killer whale ( Orcinus orca ) feeding ecology in tropical waters is scarce. In the southwest Indian Ocean, opportunistic sightings provide a valuable source of information to better understand their behaviour, diet and distrib…
View article: Correction to: Persistent declines in sightings of manta and devil rays (mobulidae) at a global hotspot in southern mozambique
Correction to: Persistent declines in sightings of manta and devil rays (mobulidae) at a global hotspot in southern mozambique Open
View article: Persistent declines in sightings of manta and devil rays (Mobulidae) at a global hotspot in southern Mozambique
Persistent declines in sightings of manta and devil rays (Mobulidae) at a global hotspot in southern Mozambique Open
Mobulid rays are among the most vulnerable of chondrichthyans to overexploitation by fisheries due to their low population growth rates. In locations where catch data are lacking, long-term sightings data can provide valuable insight to in…
View article: Directed conservation of the world’s reef sharks and rays
Directed conservation of the world’s reef sharks and rays Open
View article: Behavior, site use and demographics of shortfin devil rays, Mobula kuhlii, at a newly-discovered cleaning area in South Africa
Behavior, site use and demographics of shortfin devil rays, Mobula kuhlii, at a newly-discovered cleaning area in South Africa Open
Many shark and ray species show affinity to specific sites, making these areas critical for their survival. These include cleaning stations: locations on reefs where cleaner fish remove parasites and clean wounds, which is important for ma…
View article: Widespread diversity deficits of coral reef sharks and rays
Widespread diversity deficits of coral reef sharks and rays Open
A global survey of coral reefs reveals that overfishing is driving resident shark species toward extinction, causing diversity deficits in reef elasmobranch (shark and ray) assemblages. Our species-level analysis revealed global declines o…
View article: Demographics and dynamics of the world’s largest known population of oceanic manta rays Mobula birostris in coastal Ecuador
Demographics and dynamics of the world’s largest known population of oceanic manta rays Mobula birostris in coastal Ecuador Open
Information on the life history and demographics of oceanic manta rays Mobula birostris remains scarce. Using photo-ID data, we describe the demographic structure, population size, and possible environmental drivers of the seasonal occurre…
View article: Evidence of Závora Bay as a critical site for reef manta rays, <i>Mobula alfredi</i>, in southern Mozambique
Evidence of Závora Bay as a critical site for reef manta rays, <i>Mobula alfredi</i>, in southern Mozambique Open
The largest known reef manta ray ( Mobula alfredi ) population in Africa has been monitored for more than 20 years at several locations on the coast of the Inhambane Province in southern Mozambique. Nonetheless, before this study, little h…
View article: Residency, movement patterns, behavior and demographics of reef manta rays in Komodo National Park
Residency, movement patterns, behavior and demographics of reef manta rays in Komodo National Park Open
Background The reef manta ray ( Mobula alfredi ) is a globally threatened species and an iconic tourist attraction for visitors to Indonesia’s Komodo National Park (NP). In 2013, manta ray fishing was banned in Komodo NP and its surroundin…
View article: The fisheries Aspects of North West Water AuthoritySchemes to Increase Water Abstraction in West Cumbria
The fisheries Aspects of North West Water AuthoritySchemes to Increase Water Abstraction in West Cumbria Open
This is the report on the Fisheries Aspects of North West Water Authority Schemes to Increase Water Abstraction in West Cumbria by the Egremont and District Anglers’ Association. Existing river pollution and water abstraction in the Ennerd…
View article: Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil
Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil Open
Despite substantial progress in mobulid research over the past decade, knowledge gaps in manta ray ecology and behaviour remain, particularly in the South Atlantic Ocean. Opportunistic photographic and video records of manta rays collected…
View article: Additional file 1 of Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil
Additional file 1 of Sightings trends and behaviour of manta rays in Fernando de Noronha Archipelago, Brazil Open
Additional file 1: Table S1. FNA dataset. Database of manta ray sightings at FNA (January 2002 to November 2019). An auxiliary spreadsheet with detailed description of manta ray sightings, organized by date, species, pigmentation, gender, …
View article: Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays
Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays Open
Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays. Available at www.sharkipedia.org.
View article: Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays
Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays Open
Data used in the Living Planet Index analysis in Pacoureau et al. 2020 - Half a century of global decline in oceanic sharks and rays. Available at www.sharkipedia.org.
View article: Genome-wide SNPs detect no evidence of genetic population structure for reef manta rays (Mobula alfredi) in southern Mozambique
Genome-wide SNPs detect no evidence of genetic population structure for reef manta rays (Mobula alfredi) in southern Mozambique Open
View article: Global status and conservation potential of reef sharks
Global status and conservation potential of reef sharks Open
View article: Urban manta rays: potential manta ray nursery habitat along a highly developed Florida coastline
Urban manta rays: potential manta ray nursery habitat along a highly developed Florida coastline Open
The giant oceanic manta ray Mobula birostris was listed in the US Endangered Species Act as a threatened species in 2018, yet insufficient data exist on manta populations throughout US waters to designate critical habitat. Taxonomic and ge…
View article: Microplastics on the Menu: Plastics Pollute Indonesian Manta Ray and Whale Shark Feeding Grounds
Microplastics on the Menu: Plastics Pollute Indonesian Manta Ray and Whale Shark Feeding Grounds Open
The implications of plastic pollution, including microplastics, on marine ecosystems and species are increasingly seen as an environmental disaster. Yet few reports focus on filter-feeding megafauna in regions heavily impacted by plastic p…
View article: It's not all black and white: investigating colour polymorphism in manta rays across Indo-Pacific populations
It's not all black and white: investigating colour polymorphism in manta rays across Indo-Pacific populations Open
Intraspecific colour polymorphisms have been the focus of numerous studies, yet processes affecting melanism in the marine environment remain poorly understood. Arguably, the most prominent example of melanism in marine species occurs in m…
View article: Spotting the “small eyes”: using photo-ID methodology to study a wild population of smalleye stingrays (<i>Megatrygon microps)</i> in southern Mozambique
Spotting the “small eyes”: using photo-ID methodology to study a wild population of smalleye stingrays (<i>Megatrygon microps)</i> in southern Mozambique Open
Background The smalleye stingray ( Megatrygon microps ) is a large and rare dasyatid ray, patchily distributed across the Indo-West Pacific. Free-swimming individuals have regularly been recorded in Southern Mozambican coastal waters utili…
View article: Contrasting Habitat Use and Population Dynamics of Reef Manta Rays Within the Nusa Penida Marine Protected Area, Indonesia
Contrasting Habitat Use and Population Dynamics of Reef Manta Rays Within the Nusa Penida Marine Protected Area, Indonesia Open
Manta rays (Mobula spp.) are highly valued in nature-based tourism globally. In Indonesia, although manta rays are protected, critical information is lacking on their habitat use, population dynamics and movements. We investigate the popul…
View article: First record of the reef manta ray, Mobula alfredi, from the eastern Pacific
First record of the reef manta ray, Mobula alfredi, from the eastern Pacific Open
An opportunistic sighting of a reef manta ray (Mobula alfredi) along the northeastern corner of Cocos Island, Costa Rica, represents the first sighting of this species nearly 6000 km from the nearest confirmed sighting location in the Marq…
View article: Supplementary material from "It's not all black and white: investigating colour polymorphism in manta rays across Indo-Pacific populations"
Supplementary material from "It's not all black and white: investigating colour polymorphism in manta rays across Indo-Pacific populations" Open
Intraspecific colour polymorphisms have been the focus of numerous studies, yet processes affecting melanism in the marine environment remain poorly understood. Arguably, the most prominent example of melanism in marine species occurs in m…
View article: Research Priorities to Support Effective Manta and Devil Ray Conservation
Research Priorities to Support Effective Manta and Devil Ray Conservation Open
Manta and devil rays are filter-feeding elasmobranchs that are found circumglobally in tropical and subtropical waters. Although relatively understudied for most of the Twentieth century, public awareness and scientific research on these s…
View article: Novel signature fatty acid profile of the giant manta ray suggests reliance on an uncharacterised mesopelagic food source low in polyunsaturated fatty acids
Novel signature fatty acid profile of the giant manta ray suggests reliance on an uncharacterised mesopelagic food source low in polyunsaturated fatty acids Open
Traditionally, large planktivorous elasmobranchs have been thought to predominantly feed on surface zooplankton during daytime hours. However, the recent application of molecular methods to examine long-term assimilated diets, has revealed…
View article: Steep declines in sightings of manta rays and devilrays (Mobulidae) in southern Mozambique
Steep declines in sightings of manta rays and devilrays (Mobulidae) in southern Mozambique Open
Mobulid rays are one of the most vulnerable chondrichthyan groups due to their low population growth rates and high susceptibility to fisheries. While estimates of human-induced mortality are lacking, sighting trend data can provide an ind…
View article: Steep declines in sightings of manta rays and devilrays (Mobulidae) in southern Mozambique
Steep declines in sightings of manta rays and devilrays (Mobulidae) in southern Mozambique Open
Mobulid rays are one of the most vulnerable chondrichthyan groups due to their low population growth rates and high susceptibility to fisheries. While estimates of human-induced mortality are lacking, sighting trend data can provide an ind…
View article: <i>Manta birostris</i>, predator of the deep? Insight into the diet of the giant manta ray through stable isotope analysis
<i>Manta birostris</i>, predator of the deep? Insight into the diet of the giant manta ray through stable isotope analysis Open
The characterization of diet for the giant manta ray Manta birostris has been problematic given their large-scale movement patterns and the difficulty in obtaining stomach contents from this species. The large majority of existing informat…