Alex Hearn
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View article: Correction to: Short‑term fluctuations in hammerhead shark numbers at an aggregation site based on visual census and telemetry data
Correction to: Short‑term fluctuations in hammerhead shark numbers at an aggregation site based on visual census and telemetry data Open
View article: Inter-specific relationships and their ecological role in an oceanic elasmobranch community
Inter-specific relationships and their ecological role in an oceanic elasmobranch community Open
Marine ecosystems support a diverse array of co-occurring species, whose presence and abundance influence the behavior, population dynamics, and distribution of interacting organisms. Elasmobranchs play a central role in marine ecological …
View article: Mapping Important Shark and Ray Areas (ISRAs) in the Central and South American Pacific: Existing knowledge and data needs
Mapping Important Shark and Ray Areas (ISRAs) in the Central and South American Pacific: Existing knowledge and data needs Open
Identifying critical habitats is key to the conservation and recovery of threatened species. A third of chondrichthyans (sharks, rays, and chimaeras) are threatened with extinction but robust biological and ecological information to deline…
View article: Random swims: an evaluation of acoustic telemetry thresholds for shark behavior and residency
Random swims: an evaluation of acoustic telemetry thresholds for shark behavior and residency Open
Background Passive acoustic telemetry is a method used to quantify residency within an array of receivers, but this technology has limitations for capturing complex behaviors in sharks: pulse delays and detection range drop-offs in near-sh…
View article: Commentary: Addressing illegal longlining and ghost fishing in the Galapagos marine reserve: an overview of challenges and potential solutions
Commentary: Addressing illegal longlining and ghost fishing in the Galapagos marine reserve: an overview of challenges and potential solutions Open
View article: Random swims: An evaluation of acoustic telemetry thresholds for reef-shark behavior and residency
Random swims: An evaluation of acoustic telemetry thresholds for reef-shark behavior and residency Open
Background Passive acoustic telemetry (AT) is a method used to quantify residency within an array of receivers, but this technology has limitations for capturing complex behaviors in reef sharks: pulse intervals and detection range drop-of…
View article: Characterizing juvenile blacktip shark (<scp><i>Carcharhinus limbatus</i></scp>) nursery areas in the Galapagos: new methods and understandings
Characterizing juvenile blacktip shark (<span><i>Carcharhinus limbatus</i></span>) nursery areas in the Galapagos: new methods and understandings Open
New approaches to abundance surveying utilizing unoccupied aerial vehicles (UAVs) are proving to be effective tools in marine and terrestrial environments. We explored UAV efficacy for surveys in the Galapagos Marine Reserve (GMR), where r…
View article: Multidecadal underwater surveys reveal declines in marine turtles
Multidecadal underwater surveys reveal declines in marine turtles Open
Marine turtles are a group of imperiled marine megafauna particularly vulnerable to anthropogenic stressors. Most long‐term studies of marine turtles are based on nesting surveys which focus on numbers of eggs, hatchlings, and nesting fema…
View article: Climate-driven global redistribution of an ocean giant predicts increased threat from shipping
Climate-driven global redistribution of an ocean giant predicts increased threat from shipping Open
View article: Vulnerability of Eastern Tropical Pacific chondrichthyan fish to climate change
Vulnerability of Eastern Tropical Pacific chondrichthyan fish to climate change Open
Climate change is an environmental emergency threatening species and ecosystems globally. Oceans have absorbed about 90% of anthropogenic heat and 20%–30% of the carbon emissions, resulting in ocean warming, acidification, deoxygenation, c…
View article: Identifying priority sites for whale shark ship collision management globally
Identifying priority sites for whale shark ship collision management globally Open
View article: Fishing effort dynamics around the Galápagos Marine Reserve as depicted by AIS data
Fishing effort dynamics around the Galápagos Marine Reserve as depicted by AIS data Open
The waters around the Galápagos Marine Reserve (GMR) are important fishing grounds for authorized artisanal vessels fishing within the reserve as well as for national and foreign industrial fleets operating in the wider Ecuadorian Insular …
View article: Fine-scale oceanographic processes shape marine biodiversity patterns in the Galápagos Islands
Fine-scale oceanographic processes shape marine biodiversity patterns in the Galápagos Islands Open
Uncovering the drivers that shape biodiversity patterns is critical to understand ecological and evolutionary dynamics. Despite evidence that biodiversity composition is influenced by processes at different spatial scales, little is known …
View article: Divergent responses of pelagic and benthic fish body-size structure to remoteness and protection from humans
Divergent responses of pelagic and benthic fish body-size structure to remoteness and protection from humans Open
Animal body-size variation influences multiple processes in marine ecosystems, but habitat heterogeneity has prevented a comprehensive assessment of size across pelagic (midwater) and benthic (seabed) systems along anthropic gradients. In …
View article: A Blueprint for Marine Spatial Planning of Ecuador’s Exclusive Economic Zone around the Galápagos Marine Reserve
A Blueprint for Marine Spatial Planning of Ecuador’s Exclusive Economic Zone around the Galápagos Marine Reserve Open
The goal of this report is to provide Ecuador with a blueprint for spatial management and conservation of the open waters in the Exclusive Economic Zone (EEZ) surrounding the unique Galapagos Archipelago and Marine Reserve. It responds to …
View article: Industrial fishing compliance with a new marine corridor near the Galapagos Islands
Industrial fishing compliance with a new marine corridor near the Galapagos Islands Open
Examining fishing pressure in under-resourced marine regions still presents a challenge to understanding patterns of fishing pressure. These issues are compounded in areas with complex marine zoning regulations or those that have changed o…
View article: Advisory Editor profile: Alex Hearn
Advisory Editor profile: Alex Hearn Open
View article: Movement and vertical habitat use of yellowfin tuna <scp><i>Thunnus albacares</i></scp> in a vertically compressed habitat: the Galápagos Marine Reserve
Movement and vertical habitat use of yellowfin tuna <span><i>Thunnus albacares</i></span> in a vertically compressed habitat: the Galápagos Marine Reserve Open
Tropical pelagic predators are exploited by fisheries and their movements are influenced by factors including prey availability, temperature, and dissolved oxygen levels. As the biophysical parameters vary greatly within the range of circu…
View article: Global human footprint on fish size-spectra across marine ecosystems
Global human footprint on fish size-spectra across marine ecosystems Open
Human exploitation has profoundly depleted animal populations in the ocean, leading to declines in ecosystem productivity, resilience, and contributions to people1,2. However, it remains unclear how size structure of fish popula…
View article: Species associated with whale sharks Rhincodon typus (Orectolobiformes, Rhincodontidae) in the Galapagos Archipelago
Species associated with whale sharks Rhincodon typus (Orectolobiformes, Rhincodontidae) in the Galapagos Archipelago Open
Whale sharks Rhincodon typus frequently appear to interact or associate with other species, which vary depending on the community structure and the demographic of the whale sharks at each location globally. Here, we present the species sig…
View article: Underwater ultrasonography and blood sampling provide the first observations of reproductive biology in free-swimming whale sharks
Underwater ultrasonography and blood sampling provide the first observations of reproductive biology in free-swimming whale sharks Open
We report on a non-invasive technique for observing the reproductive states of wild, free-swimming whale sharks Rhincodon typus for the first time. Female whale sharks (n = 22) were assessed using underwater ultrasonography and a novel blo…
View article: Species associated with whale sharks (Rhincodon typus) in the Galapagos Archipelago
Species associated with whale sharks (Rhincodon typus) in the Galapagos Archipelago Open
Whale sharks ( Rhincodon typus ) frequently appear to interact or associate with other species, which vary depending on the community structure and the demographic of the whale sharks at each location globally. Here, we present the species…
View article: Diving into the vertical dimension of elasmobranch movement ecology
Diving into the vertical dimension of elasmobranch movement ecology Open
Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understand their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on…
View article: Improving sightings-derived residency estimation for whale shark aggregations: A novel metric applied to a global data set
Improving sightings-derived residency estimation for whale shark aggregations: A novel metric applied to a global data set Open
The world’s largest extant fish, the whale shark Rhincodon typus , is one of the most-studied species of sharks globally. The discovery of predictable aggregation sites where these animals gather seasonally or are sighted year-round – most…
View article: Global collision-risk hotspots of marine traffic and the world’s largest fish, the whale shark
Global collision-risk hotspots of marine traffic and the world’s largest fish, the whale shark Open
Significance Global vessel traffic is increasing alongside world economic growth. The potential for rising lethal ship strikes on endangered species of marine megafauna, such as the plankton-feeding whale shark, remains poorly understood s…
View article: Correction to: Studies of the movement ecology of sharks justify the existence and expansion of marine protected areas in the Eastern Pacific Ocean
Correction to: Studies of the movement ecology of sharks justify the existence and expansion of marine protected areas in the Eastern Pacific Ocean Open
View article: Diving into the vertical dimension of elasmobranch movement ecology
Diving into the vertical dimension of elasmobranch movement ecology Open
Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understanding their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused…
View article: Diving into the vertical dimension of elasmobranch movement ecology
Diving into the vertical dimension of elasmobranch movement ecology Open
Knowledge of the three-dimensional movement patterns of elasmobranchs is vital to understanding their ecological roles and exposure to anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused…
View article: A first assessment of the distribution and abundance of large pelagic species at Cocos Ridge seamounts (Eastern Tropical Pacific) using drifting pelagic baited remote cameras
A first assessment of the distribution and abundance of large pelagic species at Cocos Ridge seamounts (Eastern Tropical Pacific) using drifting pelagic baited remote cameras Open
Understanding the link between seamounts and large pelagic species (LPS) may provide important insights for the conservation of these species in open water ecosystems. The seamounts along the Cocos Ridge in the Eastern Tropical Pacific (ET…
View article: A first assessment of the distribution and abundance of large pelagic species at Cocos Ridge seamounts (Eastern Tropical Pacific) using drifting pelagic baited remote cameras
A first assessment of the distribution and abundance of large pelagic species at Cocos Ridge seamounts (Eastern Tropical Pacific) using drifting pelagic baited remote cameras Open
Understanding the link between seamounts and large pelagic species (LPS) may provide important insights for the conservation of these species in open water ecosystems. The seamounts along the Cocos Ridge in the Eastern Tropical Pacific (ET…