Mariano A Coscarella

Mariano A Coscarella
Centro Nacional Patagonico · Laboratorio de Mamíferos Marinos

Dr. de la Universidad de Buenos Aires - Ciencias Biológicas
Investigador del CONICET Prof. Universidad Nacional de la Patagonia San Juan Bosco

About

77
Publications
16,844
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,025
Citations
Additional affiliations
November 2013 - present
Centro Nacional Patagonico
Position
  • Senior Researcher
March 2012 - present
National University of Patagonia San Juan Bosco
Position
  • Professor (Associate)
Description
  • I teach a course on Conservation Biology
September 2000 - present
Centro Nacional Patagonico
Position
  • Researcher

Publications

Publications (77)
Article
Full-text available
Red Knots (Calidris canutus rufa) are long-distance migratory shorebirds that fly from the Arctic to the southern tip of South America. They stop over in a few places with high concentrations of trophic resources that act like population bottlenecks. At a population level, unavailable resources during a stopover can have catastrophic consequences....
Article
Red Knots (Calidris canutus rufa) are long-distance migratory shorebirds that fly from the Arctic to the southern tip of South America. They stop over in a few places with high concentrations of trophic resources that act like population bottlenecks. At a population level, unavailable resources during a stopover can have catastrophic consequences....
Article
Full-text available
Understanding the recovery of whale populations is critical for developing population-management and conservation strategies. The southern right whale (SRW) Eubalena australis was one of the baleen whale species that has experienced centuries of exploitation. We assess here for the first time the population dynamics of the SRW from the southwestern...
Article
Full-text available
Abundance estimation by means of aerial surveys is prone to errors related to the observer’s performance. We developed a monitoring method based on aerial surveys off the coastline for the Southern Right Whale (Eubalaena australis) in the breeding grounds of the Southwestern Atlantic. These surveys have been taking place since 1999, and whales have...
Article
Kylie is a solitary common dolphin who inhabits a restricted area within the Firth of Clyde (Scotland). She spends most of her time around navigational buoys in the Hunterston/Fairlie channel, where she has been seen interacting with harbour porpoises. Recordings from 2016 and 2017 were used to study her acoustic behaviour when seen alone and with...
Article
Vertebral morphology has profound biomechanical implications and plays an important role in adaptation to different habitats and foraging strategies for cetaceans. Extant porpoise species (Phocoenidae) display analogous evolutionary patterns in both hemispheres associated with convergent evolution to coastal versus oceanic environments. We employed...
Presentation
Full-text available
Particular vertebral morphologies have been reported for coastal and oceanic cetaceans. Dall’s porpoise (Phocoenoides dalli) vertebral column is considered one of the most derived among cetaceans. Total vertebral count exceeds greatly that of any other porpoise species, having strongly compressed vertebrae with exceptionally long processes. We empl...
Article
Reactions of southern right whales (SRWs) related to whale-watching boats have been reported in Patagonia, but there are no quantitative data showing how these whales react to boats not preforming whale-watching trips. The objective of this study was to investigate the reaction of SRWs to transiting vessels. Data were collected off the coast of Pue...
Article
Southern right whale-kelp gull biological interaction has been the focus of debates in Península Valdés, Argentina, not only within the academia but also in the public domain. This interaction is perceived as an important and imminent threat to whale conservation and thus to the whale watching activity. When stake-holders complain, sometimes the ma...
Conference Paper
The situation of Tursiops truncatus gephyreus is reviewed and it is concluded that an IWC "Task Team” is now critically needed to help initiate, guide and coordinate - 1) the implementation of conservation strategies set for the subpopulations in southern Brazil/Uruguay and 2) further research into the possible causes of the population declines i...
Article
Full-text available
In cetaceans, increased body flexibility is associated with increased maneuverability, this affects the animal's swimming speed and foraging behavior. A more stable body form is associated with fast swimming and wide turns. One factor that affects the flexibility of a cetacean's body is the structure and interaction of its vertebrae. Differences in...
Article
Full-text available
La foto-identificación de especies silvestres es un recurso base para la obtención de información necesaria para diversas tareas de investigaciones biológicas. Hoy en día el crowdsourcing y la ciencia ciudadana están comenzando a desempeñar un rol importante en la recopilación de datos científicos. Esta fuente de datos permite aumentar considerable...
Article
Overexploitation of marine communities can lead to modifications in the structure of the food web, and can force organisms like elasmobranchs, for example, to change their feeding habits. In order to evaluate the impact that fisheries have on food webs and on the interactions between species, it is necessary to describe and quantify the diet of the...
Article
Full-text available
Successful conservation strategies require an accurate estimation of population size, and this parameter is one of the most important factors that determine the rate of various evolutionary processes. In this study, we integrated information from genetic, photo-identification, and aerial surveys of dusky dolphins to determine the effective populati...
Article
Full-text available
JUSTIFICATION Lahille’s Bottlenose Dolphin, a subspecies of the Common Bottlenose Dolphin (Tursiops truncatus), occurs in low numbers only in southern Brazil, Uruguay and Argentina. Lahille’s Bottlenose Dolphins are mainly resident to localized areas and restricted to coastal habitat resulting in a vulnerability to increasing pressures from human a...
Article
Whale watching in Patagonia began in 1973, with the southern right whale (Eubalaena australis) as a target. Thus far, only short-term effects of whale watching on behaviour have been evaluated. The southern right whale population is increasing locally and expanding to adjacent areas. We evaluated boat effects on the biological system through the an...
Conference Paper
Full-text available
We report on the investigation of a mass stranding of 68 short-beaked common dolphins (Delphinus delphis) that occurred in Golfo Nuevo, Península Valdés, Argentina in March 2018. Twenty-one of the stranded dolphins were returned alive to the sea, while 47 animals died. Dead dolphins included all ages, with more males than females (29 males and 18 f...
Article
Social network analysis provides a powerful tool for understanding social organisation of animals. However, in free-ranging populations, it is almost impossible to monitor exhaustively the individuals of a population and to track their associations. Ignoring the issue of imperfect and possibly heterogeneous individual detection can lead to substant...
Thesis
Full-text available
En el Área Natural Protegida Punta Loma de la provincia del Chubut existe un apostadero de lobos marinos de un pelo (Otaria flavescens). Aquí se realiza la actividad turística de buceo y snorkeling dónde los visitantes entran en contacto con los animales. Para otras actividades de turismo de naturaleza con fauna silvestre se ha propuesto que estas...
Article
Full-text available
Since the 1980s, the distribution range of the southern right whale (Eubalaena australis) in Argentina was mostly located in the winter calving grounds around Península Valdés. After the international moratorium that forbade the commercial hunting, southern right whales have shown signs of recovery during the last few decades. Nowadays, it is thoug...
Data
Position of the whales recorded during the zig-zag aerial survey. Latitude, longitude, number of individuals and angle measured with the clinometer. (XLSX)
Data
Change in group composition throughout the season. Type and size (number of individuals) of group recorded during the coastal aerial surveys in Golfo San Matías in the different months. Group: Mother calf pair, Solitary animal, Breeding group; Month: August, September, October. (XLSX)
Data
Change in the distribution of right whales on the coast of Golfo San Matías. Group types and number of whales recorded per segment on the flight in which the highest number of whales was recorded each year. Group: Mother calf pair, Solitary animal, Breeding group; Segment: 1–69; Year: 2007, 2013, 2014, 2015, 2016. (XLSX)
Data
Number of right whales recorded on each coastal aerial survey between Islote Lobos and Caleta de los Loros. Data set used to estimate the population trend in Golfo San Matías, including the year and day (Julian day) in which the flight was made, the number of individuals recorded and the sea state (Beaufort scale). (XLSX)
Data
Group composition in the different hotspots. Group types and total number of whales recorded per segment in each hotspot. The data were extracted from 11 flights performed in Golfo San Matías and 11 flights performed in Península Valdés. Hotspots: Golfo Nuevo, Golfo San José, Golfo San Matías; Group: Mother calf pair, Solitary animal, Breeding grou...
Data
Relative abundance of whales in each hotspot. Total number of whales recorded and kilometres survey in each hotspot in the 11 flights performed in Golfo San Matías that were compared with the 11 flights performed in Península Valdés. Hotspots: Golfo Nuevo, Golfo San José, Golfo San Matías. (XLSX)
Article
Full-text available
Background The Southern Right Whale ( Eubalaena australis ) population of the South–western Atlantic Ocean is recovering. In the breeding ground of Peninsula Valdés, as a consequence of the population growth, expansion to new areas by some types of groups and a change in the habitat use patterns at the coastal area were recorded. Methods We analys...
Article
Full-text available
We inspected dusky dolphin (Lagenorhynchus obscurus) group dynamics in Golfo Nuevo and found differences in social organization between cold and warm seasons. Surveys were conducted onboard a research vessel, from which we collected behavioral observations and group fission‐fusion data from 2001 to 2008; we also collected photo‐identification data...
Article
This paper reports on aerial surveys conducted to estimate the relative abundance and trend in growth of the southern right whale (Eubalaena australis) population from Península Valdés. The number of whales counted tripled from 1999 to 2016. We modeled the number of whales, the number of calves, the number of solitary individuals and the number of...
Conference Paper
Full-text available
Historically, the distribution range of the Southern Right Whale in Argentina included winter calving grounds around Península Valdés. After the commercial whaling, Southern Right Whales have shown signs of recovery during the last few decades. They seem to be experiencing a density-dependent process and are expanding their distribution range in Pa...
Conference Paper
Full-text available
This paper reports on aerial surveys conducted to estimate the relative abundance and trend in growth of the southern right whale (Eubalaena australis) population from Península Valdés. The number of whales counted tripled from 1999 to 2016. We modelled number of whales, number of calves, number of Solitary Individuals and number of individuals in...
Article
Full-text available
Background Site fidelity is considered as an animal’s tendency to return to a previously occupied place; this is a component of animal behaviour that allows us to understand movement patterns and aspects related to the animal’s life history. Although there are many site fidelity metrics, the lack of standardisation presents a considerable challenge...
Data
Data S1. Example of application of the indicators IO, IT, It.
Data
Data S2. Index confidence intervals for real populations.
Article
Full-text available
Identification of individuals in marine species, especially in Cetacea, is a critical task in several biological and ecological endeavours. Most of the times this is performed through human-assisted matching within a set of pictures taken in different campaigns during several years and spread around wide geographical regions. This requires that the...
Article
Whale-watching began informally at Península Valdés in 1973. The activity primarily targeted southern right whales (Eubalaena australis). Since the early 1970s the number of people sailing out on whale-watching trips increased from several tourists a year to more than 100,000 in 2014. In this paper the fluctuations in the number of passengers, the b...
Article
The aim of the present study was to describe the type of interaction between swimmers and sea lions, during tourist trips, at a small colony in Northern Patagonia, Argentina. Particularly we explored if sea lions would show agonistic behaviors towards people, or behaviors that potentially poses a danger, and to detect which interaction may produce...
Presentation
Full-text available
Desde el año 2012 se desarrolla un programa experimental de avistajes de ballena franca austral Eubalaena australis en el Área Natural Protegida, Bahía de San Antonio, Río Negro, Argentina. Este estudio tuvo por objetivo caracterizar la reacción de las ballenas frente a las embarcaciones de turismo como base para la evaluación del impacto de la act...
Article
Full-text available
We analysed the fishermen’s perceptions on the South American sea lions (Otaria flavescens) and its interactions with the local fishery close to the Wildlife Refuge of Ilha dos Lobos, a marine protected area in southern Brazil. Sea lions prey upon the same resources targeted by the fishermen. They repeatedly hunt on the nets and consequently damage...
Article
Full-text available
In the last 30 years, whale watching tours in Patagonia, which are primarily based on viewing pods of Southern right whale, have become increasingly popular. The aim of this study was to evaluate the impact of whale watching boat trips on the behavior of whales. Data were analyzed by means of a Generalized Linear Model using a log-link function for...
Article
Full-text available
Commerson's dolphins, Cephalorhynchus commersonii, suffer bycatch in fisheries and are target of dolphin-watching activities along Patagonia. Here we described dolphins' habitat use and behavioural pattern at the estuary of Santa Cruz River. Behavioural observations were made from vantage points using a spotting scope. Boat surveys were conducted r...
Article
Full-text available
Commerson’s dolphins, Cephalorhynchus commersonii, suffer bycatch in fisheries and are target of dolphin-watching activities along Patagonia. Here we described dolphins’ habitat use and behavioural pattern at the estuary of Santa Cruz River. Behavioural observations were made from vantage points using a spotting scope. Boat surveys were conducted r...
Article
Full-text available
The management scheme of Marine Protected Areas (MPAs) includes monitoring protocols but such activities are not always carried out. This is the case for Golfo San José, a MPA in northern Patagonia, Argentina. It was created in 1975 for the protection of the southern right whale (Eubalaena australis) breeding grounds. Other components of the system...
Article
Full-text available
We investigated the association patterns of 48 identifiable Commerson's dolphins (Cephalorhynchus commersonii) photographed 2 or more times over a 2-year period in Bahía Engaño, Chubut, Argentina. The associations among them were not different from random for short time periods (7 days) but were significantly different from random for longer period...
Article
In animal behaviour studies, association indices estimate the proportion of time two individuals (i.e. a dyad) spend in association. In terms of dyads, all association indices can be interpreted as estimators of the probability that a dyad is associated. However, traditional indices rely on the assumptions that the probability to detect a particula...
Article
Full-text available
Commerson’s dolphins (Cephalorhynchus commersonii) along the Patagonian coast of South America suffer incidental mortality in fisheries and are the target of a dolphin-watching industry. We describe the daily activity patterns and assess the variation in the relative abundance of the species near the northern boundary of its range. Information was...