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Manta Rays

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lightbulbAbout this topic
Manta rays are large, pelagic cartilaginous fish belonging to the family Mobulidae, characterized by their flattened bodies, wide wingspans, and distinctive cephalic lobes. They are filter feeders, primarily consuming plankton, and are known for their complex behaviors and social structures, making them a subject of interest in marine biology and conservation studies.
lightbulbAbout this topic
Manta rays are large, pelagic cartilaginous fish belonging to the family Mobulidae, characterized by their flattened bodies, wide wingspans, and distinctive cephalic lobes. They are filter feeders, primarily consuming plankton, and are known for their complex behaviors and social structures, making them a subject of interest in marine biology and conservation studies.

Key research themes

1. What are the patterns and drivers of residential behavior, spatial ecology, and habitat use of reef manta rays (Mobula alfredi)?

This research area focuses on understanding the fine-scale spatial ecology, site fidelity, residency, nursery habitats, and environmental factors that influence the aggregation and movement patterns of reef manta rays. Insight into these behavioral and ecological aspects is crucial for delineating critical habitats, designing effective marine protected areas, and conserving vulnerable populations exhibiting high site fidelity and limited dispersal.

Key finding: Through long-term photo-identification, acoustic, and satellite telemetry from 2013 to 2021, this study revealed high residency and site fidelity of juvenile Mobula alfredi in the Wayag lagoon, with individuals repeatedly... Read more
Key finding: Utilizing a 16-year photo-identification dataset supplemented with acoustic telemetry, the authors found considerable site fidelity of M. alfredi populations within the Bird’s Head Seascape, with evidence of subpopulation... Read more
Key finding: Satellite telemetry of 23 reef manta rays in New Caledonia revealed a preference for shallow coastal habitats and high site fidelity to cleaning stations and aggregation sites within fragmented reef environments. The study... Read more
Key finding: This study employed diving surveys and autonomous cameras to analyze environmental predictors affecting visitation patterns of manta rays at cleaning stations in the Philippines. Results demonstrated that variables such as... Read more

2. How do population genetics and connectivity vary between oceanic (M. birostris) and reef (M. alfredi) manta rays, and what are the implications for global and regional management?

Research here investigates genetic diversity, population structure, and connectivity of manta rays across global and regional scales using genome-wide data. Understanding these patterns informs population resilience against exploitation, delineates management units, and helps clarify taxonomic uncertainties in species with complex distributions and recent divergence.

Key finding: Genome-wide SNP analyses of 173 individuals across 12 locations demonstrated that Mobula birostris exhibits significantly higher genetic diversity and global connectivity than the more resident Mobula alfredi. Historical... Read more
Key finding: The study applied high-throughput sequencing to assess species delimitation and genetic diversity among Mobulidae, emphasizing the challenges posed by morphological similarity and taxonomic ambiguities. Inclusion of global... Read more

3. What are the causes and conservation implications of sublethal injuries and physical abnormalities in manta ray populations?

This area examines the prevalence, origin, and fitness costs of sublethal injuries in manta rays, distinguishing between anthropogenic sources (e.g., fishing gear entanglement, boat strikes) and natural causes (e.g., predation attempts, disease). Insights inform the assessment of human impacts on health and behavior, which affect population viability and guide management interventions to mitigate ongoing threats.

Key finding: By analyzing over 73,000 photo-ID sightings from 1987 to 2019, this study quantified the frequency and types of injuries in Maldives manta rays and distinguished natural from anthropogenic origins. Anthropogenic injuries... Read more
Key finding: The review highlights that unregulated tourism can inflict sublethal and lethal injuries on manta rays, contributing to population risk. It synthesizes existing evidence on boat strikes and tourist disturbance, emphasizing... Read more

All papers in Manta Rays

Raja Ampat, located in West Papua-Indonesia, is renowned as a favoured tourist destination for manta ray tourism. In the years following the pandemic, there has been a noticeable increase in the number of visitors. Despite the benefits... more
Many shark bites to humans, including fatalities, have involved surfers. Various personal shark deterrents are commercially available to surfers, including Rpela v2, which is a battery-powered device fitted to a surfboard. It produces an... more
Attacks on humans by predators occur worldwide. This paper analyzes several documented and reported attacks in the available literature and discusses the causes and consequences of this type of human-wildlife conflict. We make a... more
Seagrass meadows are an important component of coastal ecosystems globally, and they capture and store organic carbon in living biomass and sediments. Geographical estimates of blue carbon in seagrass habitats are regionally biased, with... more
The research reported in this document was conducted by a group of researchers within the Marine and Tropical Sciences Research Facility (MTSRF) Program 8 (led by Dr Colin Simpfendorfer), under Project 4.8.6 (led by Professor Bruce... more
The resources of Baluran National Park have been used for marine and coastal ecotourism. The increasing number of visitors has led to the increasing of tourists and its related activities. This condition will cause the degradation of... more
The provision of the whale shark (Rhincodon typus) protection status imposed us to formulate an effective interception Standard Operational Procedure (SOP) for the visitor as an effort to manage sustainable fisheries resources. The... more
Responses to unprovoked shark bite involve public policies and management approaches that contend with the needs of public safety and the responsibility to protect threatened species. In Australia (Queensland and New South Wales) and... more
Many shark bites to humans, including fatalities, have involved surfers. Various personal shark deterrents are commercially available to surfers, including Rpela v2, which is a battery-powered device fitted to a surfboard. It produces an... more
This study examines the approach patterns of sharks in the vicinity of human divers, focusing on the diver's body orientation and a shark's distance from the sea bed when approaching the diver. A standardized video method was used to... more
Through the perspective of partnership for Sustainable Development Goals (SDGs 17th), this study aims to identify and describe the information gaps among stakeholders of the dive tourism industry of Komodo National Park as one of the... more
Abstract: Coastal and Marine Tourism (CMT), as part of the oceans economy, offers significant development opportunities that can contribute to job creation and sustainability. However, there are limited national and international best... more
Cage diving is the most important activity for the sustainable use of white sharks (Carcharodon carcharias). However, information related to their behaviour during ecotourism is scarce. This study provides useful information for... more
International tourism market competition is forcing each country to diversify tourism products that uniqueness of each country. Tourism market has shifted from "product driven" go to"market driven". It means, consumers... more
Responses to unprovoked shark bite involve public policies and management approaches that contend with the needs of public safety and the responsibility to protect threatened species. In Australia (Queensland and New South Wales) and... more
Many shark bites to humans, including fatalities, have involved surfers. Various personal shark deterrents are commercially available to surfers, including Rpela v2, which is a battery-powered device fitted to a surfboard. It produces an... more
Responses to unprovoked shark bite involve public policies and management approaches that contend with the needs of public safety and the responsibility to protect threatened species. In Australia (Queensland and New South Wales) and... more
The provision of the whale shark (Rhincodon typus) protection status imposed us to formulate an effective interception Standard Operational Procedure (SOP) for the visitor as an effort to manage sustainable fisheries resources. The... more
Many reports have categorized the frequency, circumstances, and causes for interactions between sharks and humans, often using the behaviorally inaccurate term "attack." The California Department of Fish and Wildlife (Department) instead... more
The provision of the whale shark (Rhincodon typus) protection status imposed us to formulate an effective interception Standard Operational Procedure (SOP) for the visitor as an effort to manage sustainable fisheries resources. The... more
How animals use a set of physical characteristics and resources in a habitat, together with the time over which they use them, is known as habitat use (Hall et al., 1997). Energy is the most precious asset in an ecosystem (Lawson et al.,... more
One recurring factor seemingly causing an increase in shark attacks is lunar cycles, especially the full moon. However, the potential association between shark attacks and lunar cycles has never been verified. Our results show that a... more
Shark attacks are a global phenomenon that attracts widespread attention and publicity, often with negative outcomes for shark populations. Despite the widespread perceptions of shark attacks, trends in human water activities and shark... more
A large reef manta ray (Manta alfredi) aggregation has been observed off the north Sudanese Red Sea coast since the 1950s. Sightings have been predominantly within the boundaries of a marine protected area (MPA), which was designated a... more
Global coral reef related tourism is one of the most significant examples of nature-based tourism from a single ecosystem. Coral reefs attract foreign and domestic visitors and generate revenues, including foreign exchange earnings, in... more
A detailed understanding of the dynamics of small-scale (10s km) habitat use by the reef manta ray (Mobula alfredi) in the Maldives Archipelago is required to develop an effective national conservation management plan for this... more
A large reef manta ray (Manta alfredi) aggregation has been observed off the north Sudanese Red Sea coast since the 1950s. Sightings have been predominantly within the boundaries of a marine protected area (MPA), which was designated a... more
There is increasing concern about the conservation status of sharks. However, the presence of numerous different (and potentially mutually exclusive) policies complicates management implementation and public understanding of the process.... more
Conflict between humans and large predators is a longstanding challenge that can present negative consequences for humans and wildlife. Sharks have a global distribution and are considered to pose a potential threat to humans;... more
The transformation of the fishing industry into tourism has become a global trend. Due to the continuous crisis on the field, professional fishermen turn to maritime tourism activities, providing a memorable tourism experience to... more
Despite the low chance of a person being bitten by a shark, there are serious associated costs. Electronic deterrents are currently the only types of personal deterrent with empirical evidence of a substantial reduction in the probability... more
Manta rays are flagship species for marine conservation because of a number of threats including anthropogenic, overfishing, plastics (microplastics), over tourism, commercial trade (gills for medicine), and chaotic shipping lines where... more
Coastal resources are an important component for recreational activities. With increasing tourism activities in the world, beaches in several parts of the world are getting each time much crowded with the resulting threats to local... more
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