Natacha Aguilar de Soto

Natacha Aguilar de Soto
Universidad de La Laguna | ULL

PhD

About

124
Publications
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4,441
Citations

Publications

Publications (124)
Poster
Full-text available
The steep bathymetry of the volcanic archipelago of the Canary Islands favors finding an exceptional deep-water fauna near the coast. The Deep Scattering Layer (DSL) is considered the largest biomass of the planet but it is still largely unknown. Here we contribute quantification methods. The DSL occurs in the mesopelagic domain (200-1000 m) and pe...
Article
Large predators typically feed on proportionally sized prey but the world's largest animals, baleen whales, bulk feed on plankton and small fishes. While most baleen whales migrate to feed on polar aggregations of nutritious zooplankton prey, Bryde's whales (Balaenoptera edeni brydei and B. e. edeni) inhabit less productive warm‐temperate waters wi...
Article
Full-text available
The number and size of whale-watching and swim-with-cetacean vessels are increasing worldwide, but the noise impact on targeted species depends on vessel source characteristics, which remain largely unquantified. Here, we report the acoustic characteristics from 13 whale-watching vessels from Australia and Canary Islands. Acoustic recorders were de...
Article
Full-text available
Abstract available in English, Spanish and Portuguese. The deep sea has been described as the last major ecological frontier, as much of its biodiversity is yet to be discovered and described. Beaked whales (ziphiids) are among the most visible inhabitants of the deep sea, due to their large size and worldwide distribution, and their taxonomic div...
Article
Full-text available
Acceleration‐based proxies for activity and energy expenditure are widely used in bio‐logging studies of animal movement and locomotion to explore biomechanical strategies, energetic costs of behaviour, habitat use and the impact of anthropogenic disturbance. The foremost such proxy is Overall Dynamic Body Acceleration (ODBA) along with variants Ve...
Article
Full-text available
Visual predators rely on fast-acting optokinetic responses to track and capture agile prey. Most toothed whales, however, rely on echolocation for hunting and have converged on biosonar clicking rates reaching 500/s during prey pursuits. If echoes are processed on a click-by-click basis, as assumed, neural responses 100× faster than those in vision...
Article
Full-text available
Wide-ranging connectivity patterns of common bottlenose dolphins (Tursiops trunca-tus) are generally poorly known worldwide and more so within the oceanic archipelagos of Macaronesia in the North East (NE) Atlantic. This study aimed to identify long-range movements between the archipelagos of Macaronesia that lie between 500 and 1,500 km apart, and...
Article
Short-finned pilot whales (Globicephala macrorhynchus) are large, deep-diving predators with diverse foraging strategies, but little is known about their echolocation. To quantify the source properties of short-finned pilot whale clicks, we made 15 deployments off the coast of Tenerife of a deep-water hydrophone array consisting of seven autonomous...
Article
Echolocating animals that forage in social groups can potentially benefit from eavesdropping on other group members, cooperative foraging or social defence, but may also face problems of acoustic interference and intra-group competition for prey. Here, we investigate these potential trade-offs of sociality for extreme deep-diving Blainville′s and C...
Article
Full-text available
Fear of predation can induce profound changes in the behaviour and physiology of prey species even if predator encounters are infrequent. For echolocating toothed whales, the use of sound to forage exposes them to detection by eavesdropping predators, but while some species exploit social defences or produce cryptic acoustic signals, deep-diving be...
Article
For vocal animals with distinctive calls, passive acoustic monitoring can be used to infer presence, distribution, and abundance provided that the calls and calling behaviour are known. Key to enabling quantitative acoustic surveys are calibrated recordings of identified species from which the source parameters of the sounds can be estimated. Obtai...
Conference Paper
Deep-diving whales must meet their energetic requirements by foraging efficiently in time-limited dives. Pilot whales are active hunters that sprint to catch few prey items while beaked whales target more low-caloric prey. Within depth-stratified pelagic habitats, the mesopelagic deep scattering layer constitutes the highest biomass concentration i...
Poster
Full-text available
Sperm whales (Physeter macrocephalus) produce powerful clicks that allow them to echolocate prey at long ranges in the darkness of the deep ocean. They use information gleaned by echolocation to choose dynamically the foraging habitat targeted in each dive. At high latitudes they exploit epi-, meso-, and benthopelagic prey with highly variable divi...
Article
Full-text available
Echolocating toothed whales produce powerful clicks pneumatically to detect prey in the deep sea where this long-range sensory channel makes them formidable top predators. However, air supplies for sound production compress with depth following Boyle’s law suggesting that deep-diving whales must use very small air volumes per echolocation click to...
Article
Full-text available
Mass stranding events (MSEs) of beaked whales (BWs) were extremely rare prior to the 1960s but increased markedly after the development of naval mid-frequency active sonar (MFAS). The temporal and spatial associations between atypical BW MSEs and naval exercises were first observed in the Canary Islands, Spain, in the mid-1980s. Further research on...
Article
Full-text available
Aim The knowledge of a species biogeographical patterns greatly enhances our understanding of geographical ecology, which can improve identifying key conservation needs. Yet, this knowledge is still scarce for many marine top predators. Here, we aim to analyse movement patterns and spatial structuring of a large predator, the short‐finned pilot wha...
Article
Full-text available
Until the 1990s, beaked whales were one of the least understood groups of large mammals. Information on northern bottlenose whales (Hyperoodon ampullatus) and Baird’s beaked whales (Berardius bairdii) was available from data collected during whaling, however, little information existed on the smaller species other than occasional data gleaned from...
Presentation
Full-text available
The distribution of non-commercial large cephalopods is still largely unknown in spite of their important ecological role as top-predators in the oceans. Here we compile a large dataset of opportunistic findings of more than fifty giant/large cephalopods in the Canary Islands showing that the archipelago holds one of the highest rates of occurrence...
Article
Full-text available
Many animals require intervals of rest or sleep in which their vigilance level is reduced. For marine fauna, including large baleen whales, resting potentially increases the risk of predation and vessel-strike. However, there is scarce information about how, and how often, whales rest which makes it difficult to assess the severity of this risk. He...
Article
This work investigates whether a submarine volcanic eruption off El Hierro (Canary Islands) in October 2011 influenced the metal contents of two deep water cephalopod species: Abraliopsis morisii and Pyroteuthis margaritifera. This was assessed by comparing metal contents in specimens collected off the island of El Hierro and in the neighbouring is...
Technical Report
Full-text available
El objetivo principal del proyecto “Physico-chemical, biological and geological study of an underwater volcano in a degassing stage: island of El Hierro”, (VULCANO-II, CTM2014-51837-R) es estudiar, desde un punto de vista totalmente multidisciplinar, la fase de desgasificación activa del único volcán submarino monitoreado desde su nacimiento en agu...
Poster
Full-text available
Se estudiaron 180 muestras de dos especies de cefalópodos (Abraliopsis morisii y Pyroteuthis maragaritifera) de las islas de El Hierro, La Palma y Tenerife pescados en la campaña oceanográfica CETOBAPH. De las muestras se analizaron 20 metales pesados y se elaboró un estudio estadístico para comprobar si habían diferencias de concentraciones de met...
Conference Paper
Full-text available
Blainville’s beaked whales (Mesoplodon densirostris) perform long deep foraging dives in which they use echolocation to hunt individual prey. Although social groups of Blainville's synchronize their dives, it is unknown if group size may affect their echolocation behaviour and specifically their vocal production, as has been proposed for bottlenose...
Article
Full-text available
Passive acoustic monitoring has become an increasingly prevalent tool for estimating density of marine mammals, such as beaked whales, which vocalize often but are difficult to survey visually. Counts of acoustic cues (e.g., vocalizations), when corrected for detection probability, can be translated into animal density estimates by applying an indi...
Article
Full-text available
The True’s beaked whale (Mesoplodon mirus, True 1913) is a poorly known member of the Ziphiidae family. Its distribution in the northern hemisphere is thought to be restricted to the temperate or warm temperate waters of the North Atlantic, while a few stranding records from the southern hemisphere suggest a wider and antitropical distribution, ext...
Data
Gervais’ beaked whales in a group of four whales breaching repetitively in the Canary Islands, recorded by Roland Gockel (MEER)
Data
Underwater video of True’ beaked whales recorded off the Azores by R Edler within the Master Mint program (report 8 Table 1)
Conference Paper
The development of guidelines for mitigating noise impacts on marine fauna requires data about the biological relevance of noise effects and about the practicality of mitigation options. Recent expansion of scientific knowledge has shown that noise effects vary among animals with different behavioral ecophysiology. Beaked whales exemplify that some...
Conference Paper
Full-text available
The Araguaian boto (Inia araguaiaensis), a newly described species of river dolphin, is also one of the most threatened cetaceans as it inhabits the most modified riverine system in the Amazon. To enable passive acoustic surveys of this species, we conducted a pilot study of a population associated with the municipal market of Mocajuba, Pará State,...
Conference Paper
Full-text available
Los zifios presentan comportamientos de buceo y acústico que los distinguen de otros odontocetos, destacando su característico silencio cerca de superficie, a pesar de la cohesión de los grupos observados en emersión. Para comprobar si esta cohesión se traduce en coordinación en los perfiles de inmersión y sincronía de la actividad acústica durante...
Article
Toothed whales use a pneumatic sound generator to produce echolocation and communication sounds. Increasing hydrostatic pressure at depth influences the amplitude and duration of calls but not of echolocation clicks. Here we test the hypothesis that information transfer at depth might be facilitated by click-based communication signals. Wild short-...
Article
Full-text available
The sperm whale carries a hypertrophied nose that generates powerful clicks for long-range echolocation. However, it remains a conundrum how this bizarrely shaped apex predator catches its prey. Several hypotheses have been advanced to propose both active and passive means to acquire prey, including acoustic debilitation of prey with very powerful...
Technical Report
Full-text available
Restriction site-associated DNA (RAD) sequencing has become a popular approach to genotyping non-model organisms for ecological and evolutionary studies. However, there is difficulty in predicting how many variable loci will be recovered for a given protocol, combination of restriction enzymes and/or size selection criteria. Here we undertake a pil...
Article
Full-text available
Studies of locomotion kinematics require high-resolution information about body movements and the specific acceleration (SA) that these generate. On-animal accelerometers measure both orientation and SA but an additional orientation sensor is needed to accurately separate these. Although gyroscopes can perform this function, their power consumption...
Article
Full-text available
Sperm whales are present in the Canary Islands year-round, suggesting that the archipelago is an important area for this species in the North Atlantic. However, the area experiences one of the highest reported rates of sperm whale ship-strike in the world. Here we investigate if the number of sperm whales found in the archipelago can sustain the cu...
Poster
Full-text available
Systematic data collection of cetacean and seabird distribution in offshore waters is challenging due to the high costs of performing oceanic surveys. Opportunistic platforms such as ferries have proven to be effective in gathering consistent data in local areas and in large offshore routes. Data are used to study the spatial and temporal distribut...
Poster
Systematic data collection of cetacean and seabird distribution in offshore waters is challenging due to the high costs of performing oceanic surveys. Opportunistic platforms such as ferries have proven to be effective in gathering consistent data in local areas and in large offshore routes. Data are used to study the spatial and temporal distribut...
Poster
Systematic data collection of cetacean and seabird distribution in offshore waters is challenging due to the high costs of performing oceanic surveys. Opportunistic platforms such as ferries have proven to be effective in gathering consistent data in local areas and in large offshore routes. Data are used to study the spatial and temporal distribut...
Poster
Systematic data collection of cetacean and seabird distribution in offshore waters is challenging due to the high costs of performing oceanic surveys. Opportunistic platforms such as ferries have proven to be effective in gathering consistent data in local areas and in large offshore routes. Data are used to study the spatial and temporal distribut...
Poster
Systematic data collection of cetacean and seabird distribution in offshore waters is challenging due to the high costs of performing oceanic surveys. Opportunistic platforms such as ferries have proven to be effective in gathering consistent data in local areas and in large offshore routes. Data are used to study the spatial and temporal distribut...
Conference Paper
Full-text available
Passive acoustic monitoring has become an increasingly prevalent tool for estimating the density of marine mammals, such as beaked whales, which vocalise often but are difficult to survey visually. Acoustic cue counts, when corrected for detection probability, can be translated into an estimate of animal density by applying an individual cue produc...
Preprint
Full-text available
The True´s beaked whale (Mesoplodon mirus, True 1913) is a poorly studied member of the speciose Ziphiidae family. Its distribution in the North Hemisphere is thought to be restricted to the temperate or warm temperate waters of the North Atlantic, while a small number of stranding records from the Southern Hemisphere suggest a wider distribution,...
Preprint
Full-text available
The True´s beaked whale (Mesoplodon mirus, True 1913) is a poorly studied member of the speciose Ziphiidae family. Its distribution in the North Hemisphere is thought to be restricted to the temperate or warm temperate waters of the North Atlantic, while a small number of stranding records from the Southern Hemisphere suggest a wider distribution,...
Chapter
1: Effects of salinity as a stressor to aquatic invertebrates 2: Respiratory responses of marine animals to environmental hypoxia 3: Physiological effects of ocean acidification on animal calcifiers 4: Physiological responses of marine invertebrates to thermal stress 5: Physiological impacts of chemical pollutants in marine animals 6: Nitrogen stre...
Article
Diel vertical migration (DVM) facilitates biogeochemical exchanges between shallow waters and the deep ocean. An effective way of monitoring the migrant biota is by acoustic observations although the interpretation of the scattering layers poses challenges. Here we combine results from acoustic observations at 18 and 38 kHz with limited net samplin...
Article
Marine invertebrates at the base of oceanic trophic webs play important ecological and economical roles supporting worldwide fisheries worth millions. There is an increasing concern about the effects of anthropogenic noise on marine fauna but little is known about its effects on invertebrates. Here the current peer-reviewed literature on this subje...
Poster
Once considered abundant, the short-beaked common dolphin (Delphinus delphis) in the Mediterranean Sea has been subject to a large-scale decline during the last few decades. Despite considerable efforts in the conservation of this species, to date, only a few conservation measures have been implemented. Furthermore, although Malta is recognized as...
Article
Full-text available
Diving animals modulate their swimming gaits to promote locomotor efficiency and so enable longer, more productive dives. Beaked whales perform extremely long and deep foraging dives that probably exceed aerobic capacities for some species. Here, we use biomechanical data from suction-cup tags attached to three species of beaked whales (Mesoplodon...
Article
Full-text available
Predators make foraging decisions based upon sensory information about resource availability, but little is known about how large, air-breathing predators collect and use such information to maximize energy returns when foraging in the deep sea. Here, we used archival tags to study how echolocating sperm whales (Physeter macrocephalus) use their lo...
Article
Echolocating animals exercise an extensive control over the spectral and temporal properties of their biosonar signals to facilitate perception of their actively generated auditory scene when homing in on prey. The intensity and directionality of the biosonar beam defines the field of view of echolocating animals by affecting the acoustic detection...
Conference Paper
Full-text available
Fine-scale studies of kinematics and energetics of locomotion require estimates of the specific acceleration (SA) generated by animal movements. Accelerometers measure SA and orientation which can vary widely and continuously in aquatic animals. In steady swimming, overall body posture varies slowly in comparison with stroking rate and so this comp...
Article
Peter Madsen and colleagues provide a quick introduction into the beaked whales.