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Marcos Rossi-Santos

Marcos Rossi-Santos
Universidade Federal do Recôncavo da Bahia / Curtin Universtity · Centro de Ciencias Agrarias Ambientais e Biologicas / Centre for Marine Science and Technology

PhD

About

65
Publications
14,200
Reads
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1,295
Citations
Citations since 2016
24 Research Items
701 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
My research interests are focused on vertebrate behavioural ecology, mostly marine mammals, and on the Anthropogenic impacts on natural habitats. I have been employing observational and technological methods, such as acoustics and imaging, to better understand animal behaviour and how human impacts may affect their ecology.

Publications

Publications (65)
Article
Full-text available
The Antarctic minke whale ( Balaenoptera bonaerensis ) (AMW) is one of the smallest species among baleen whales, occurring in the southern hemisphere from Antarctica to near the equator, and performing seasonal migrations from polar to tropical waters. Information about (AMW) occurrence in the winter breeding grounds is scarce, mostly coming from o...
Article
Full-text available
The Atlantic sector of the Southern Ocean (ASSO) has one of the highest densities of Antarctic krill ( Euphausia superba ) compared to other polar and subpolar regions, which attracts migratory baleen whale species to aggregate in this area for feeding. Humpback whales ( Megaptera novaeangliae ) also sing extensively while on the Southern Ocean fee...
Article
Cetaceans depend highly on acoustic signals, such as whistles, for social communication. Mixed-species associations (MSAs), temporary or long-term encounters between different species, may play an important role on the acoustic dynamics of the species involved. Because of whistles’ communication function, we used these sounds to investigate the aco...
Book
O objetivo foi reunir resultados importantes de pesquisas realizadas no Brasil, que contribuíram de forma significativa para aumentar o conhecimento sobre sua biologia e seu grau de ameaça, auxiliando na identificação de medidas que possam diminuir sua mortalidade, seja em Planos de Ação, ou nas ações institucionais das diversas universidades e ONG...
Article
Understanding the relative performance of data collection methods is critical for the production of robust results in any biological field study. This is particularly relevant for monitoring studies of rare and inconspicuous species, such as some cetaceans. Here, we compared how passive acoustic and visual survey methods performed when surveying a...
Preprint
Full-text available
Acoustic methods can provide important data on the occurrence and distribution of migratory species. Information about Antarctic Minke whale (Balaenoptera bonaerensis) occurrence in the winter breeding grounds is scarce, mostly limited to old records from whaling stations before 1960’s international moratory, such as Costinha Station in Northeaster...
Article
Full-text available
The vocal repertoire of the pantropical spotted dolphin (Stenella attenuata) is poorly documented, with no published information about acoustic signals from South Atlantic Ocean populations. We conducted passive acoustic monitoring and recording of S. attenuata population in the Santos Basin, Brazil, using a towed hydrophone array during line-trans...
Article
Full-text available
Brazilian government is about to approve new policies to increase ship cargo traffic among Brazilian ports. The Brazilian Infrastructure Ministry estimates an increase of 40 % in the ship traffic traveling the Brazilian coast until the next year. Herein, we point out negative consequences based on this scenario and discuss possible solutions for a...
Book
Full-text available
Este livro teve o objetivo de reunir resultados importantes de pesquisas realizadas no Brasil, que contribuíram de forma significativa para aumentar o conhecimento sobre sua biologia e seu grau de ameaça, auxiliando na identificação de medidas que possam diminuir sua mortalidade, seja em Planos de Ação, ou nas ações institucionais das diversas univ...
Poster
Full-text available
South America hosts two stocks of humpback whales (Megaptera novaeangliae), stock A occupying southwest waters of the Atlantic, and stock G, located in the Southeast Pacific. After breeding in these locations in the austral winter and spring, both stocks travel in the austral summer to the feeding areas located in the Magellan Strait, Corcovado Gul...
Poster
Full-text available
The rough-toothed dolphin (Steno bredanensis) occurs throughout tropical and warm-temperate waters worldwide. However, there are few descriptions of the echolocation clicks of the species, and most studies are concentrated in the Pacific Ocean. In Brazil, all previous works on their acoustic signals were recorded generally near the coast and report...
Chapter
Full-text available
O uso de embarcação a vela em seus diversos usos (educação, logística, ecoeficiência e apoio a pesquisa científica) é, portanto, uma excelente ferramenta de conservação marinha e uma solução alternativa concreta para o desafio energético e mudança climática devido a sua baixa emissão de dióxido de carbono na atmosfera, redução do consumo de combust...
Conference Paper
Full-text available
Marine soundscapes are being dominated by anthropogenic sounds, influencing important aspects of animal ecology such as finding a mate. Cetaceans are ecologically important for marine habitats as natural regulators in their web-chains and impacting them may result in a major ecological concern. This work attempts to describe the occurrence of anthr...
Chapter
Full-text available
The Sotalia guianensis dolphin occurs in the western Atlantic Ocean, from the south of Brazil to Central America. It is a coastal species, much susceptible to human impacts, as anthropogenic noises, which in general causes potential impacts in marine mammals’ populations, because the emission and reception of sound signals plays a complex and vital...
Chapter
Full-text available
Whale-watching tourism has been growing in recent years in Praia do Forte, northeastern Brazil and to manage this activity in a sustainable manner it is important to determine its carrying capacity. However, an assessment of whale-watching carrying capacity requires an understanding of the biological, social and economic dimensions, as well as cons...
Chapter
Full-text available
In this chapter, the song behavior and acoustic ecology of humpback whales (Megaptera novaeangliae) in the Brazilian breeding ground are documented, between 2005 and 2010 (July to October). Behavioral and ecological aspects such as group composition, spatial distribution, depth, tides and moon were analyzed, through boat surveys. We sighted 370 wha...
Chapter
Full-text available
Using opportunistic platforms to study humpback whales (Megaptera novaeangliae) during their breeding season, from July to November, we analyzed the distribution of dolphin sightings in a poorly studied area, the north coast of Bahia State, Brazil. Between 2001 and 2006, more than 500 days of surveys were performed (2360 h of effort), in which 93 g...
Book
This book gathers the most recent research findings on ecology and conservation of marine vertebrates in Latin America, making use of high technological methods to show readers the diversity of the marine research that has been conducted in these countries over the last decades. The book brings authors from more than 23 institutions of 7 different...
Article
Full-text available
This study investigated the emission of subaquatic noise from recreational tourism motorboats, schooners and a sea-bottom mounted water pump. Analyses demonstrated alterations in several whistle (IF: t = 2.42, P = 0.015; FF: t = −2.22, P = 0.025) and calls patterns (MIF: t = −3.13, P = 0.001; MAF: t = −3.49, P = 0.0005; FD: t = −2.21, P = 0.027; D:...
Conference Paper
Whale-watching tourism is growing in the world, mostly due to the charisma that cetaceans exert on humans as well as the constant conservationist appeal that shows a strong argument for no return of commercial whaling. Nevertheless, this activity may harm cetacean populations, in the form of behavioral changes, acoustic masking, or physiological im...
Chapter
This chapter will introduce readers to the marine soundscape ecology through a cetacean study perspective. Unravelling the behavioral ecology of whales and dolphins in the southwestern Atlantic Ocean provides information about the marine habitat in which they live, in this case, the continental shelf. The study also describes methods for underwater...
Article
Full-text available
Acoustic parameters for the spinner dolphins' bioacoustic sounds have previously been described. However, the dolphins in the Southwest Atlantic Ocean were only recently studied near the Fernando de Noronha Archipelago. Therefore, to contribute to additional knowledge of this cosmopolitan species, this study compares previous results with a Br...
Conference Paper
Full-text available
Spinner dolphins bioacoustics were study only in Fernando de Noronha Archipelago region in the Western South Atlantic Ocean. Our study aimed to describe the acoustic parameters of this species recorded approximately 3500 km south of Fernando de Noronha Archipelago. An one-element hydrophone was towed 250 m behind the vessel R/V Atlântico Sul over t...
Article
Full-text available
The present work aims to assess acoustic overlapping between the humpback whale song and anthropogenic sounds around oil and gas platforms through spectral description and frequency comparison. Whales were monitored systematically in northeastern Brazil (11° S, 37° W to 14° S, 38° W). Acoustic and behavioral data were collected from 2007 to 2009, f...
Data
Full-text available
Rossi-Santos, M.R., 0000. Oil industry and noise pollution in the humpback whale (Megaptera novaeangliae) soundscape ecology of the southwestern Atlantic breeding ground. Journal of Coastal Research, 00(0), 000–000. Coconut Creek (Florida), ISSN 0749-0208. The present work aims to assess acoustic overlapping between the humpback whale song and anth...
Article
Full-text available
Oceanic waters are difficult to assess, and there are many gaps in knowledge regarding cetacean occurrence. To fill some of these gaps, this article provides important cetacean records obtained in the winter of 2010 during a dedicated expedition to collect visual and acoustic information in the Vitória-Trindade seamounts. We observed 19 groups of c...
Article
Although it is largely assumed that shark predation and predation risk are unimportant to large cetaceans, whales can make up large portions of the diets of some shark species. We investigated interactions between sharks and cetaceans in the Abrolhos Bank (16°40′ to 19°40′S), off the eastern coast of Brazil, including scavenging and predation attem...
Article
Full-text available
Humpback whales (Megaptera novaeangliae) migrate between their feeding grounds, located in high latitudes, and their breeding grounds, located in low latitudes, exhibiting certain levels of site fidelity to their migratory destinations. The residence time, also known as occupancy rate, can be defined as the minimum number of days that those individ...
Article
Social networks are static illustrations of dynamic societies, within which social interactions are constantly changing. Fundamental sources of variation include ranging behaviour and temporal demographic changes. Spatiotemporal dynamics can favour or limit opportunities for individuals to interact, and then a network may not essentially represent...
Article
Full-text available
The present work brings information about the first sightings of the bottlenose dolphin, Tursiops truncatus, in the oceanic island of Trindade, 1140 km off the Brazilian coast. Nine days of opportunistic boat surveys were performed between December 2009 and March 2010, totalling 54 hours of sampling effort. Three sightings were obtained of the bott...
Article
Full-text available
Dolphins of the genus Sotalia (Delphinidae) occur along the Atlantic and Caribbean coasts of South and Central America and in the Amazon and Orinoco River basins (Flores and Da Silva, 2009; da Silva et al., 2010 this volume; Gómez-Salazar et al., 2010 this volume). The genus has been divided into two species based on skull morphology (Monteiro Filh...
Article
Full-text available
Genes of the major histocompatibility complex (MHC) play a key role in the initiation of immune response in jawed vertebrates. Variation at MHC loci can be used as an indicator of the genetic ‘health’ of natural populations and offer insight into potential susceptibility to epizootics. Here we present the first characterization of the sequence vari...
Article
Full-text available
Habitat use patterns of the Guiana dolphin ( Sotalia guianensis) were assessed in the Caravelas River Estuary, eastern Brazilian coast (17°54’S, 39°21’W). During 191 surveys (2002-2004), 187 groups were sighted. The Arcview 3.1 software was used to create a GIS environment that included the distribution of dolphin sightings, a 5x5km quadrats grid,...
Article
Full-text available
Here we consider the phylogeography and population structure of the South American coastal and riverine dolphins, Sotalia guianensis and Sotalia fluviatilis, based on samples (n = 76) collected across more than 9000km of the species distribution. Phylogenetic reconstruction of 31 distinct haplotypes based on a combined analysis of two mitochondrial...
Article
Site fidelity and movements were studied for humpback whales photo-identified from 1989 to 2006 in the Abrolhos Bank, southwestern Atlantic, Brazil. A total of 2,612 individuals were identified, 374 of which were observed on more than one occasion. The cumulative number of identified whales has increased since 1989. Recapture rate was low and varie...
Article
This study represents the first attempt to study the population dynamics of Guiana dolphins (Sotalia guianensis), by evaluating a set of demographic parameters. The population of the Caravelas River estuary, eastern Brazil, was systematically monitored through a long-term mark-recapture experiment (2002–2009). Abundance estimates revealed a small p...
Article
Full-text available
The large majority of cetacean interspecific studies report only on dolphin interactions, while studies on interactions between odontocete and mysticete are less common. The present work aims to report on sightings of cetacean interactions, during the breeding season of humpback whales (Megaptera novaeangliae), along 370 km of the Bahia State, nort...
Article
Full-text available
Commensal associations between Guiana dolphins Sotalia guianensis and sea birds, Larus dominicanus, Sula leucogaster, Sterna sp. and Fregata magnificens have been frequently observed during the feeding behavior of the dolphins in the North Bay of Santa Catarina, (26°00'-28°25'S, 48°30'-48°49'W), Southern Brazil. Boat and land surveys were performed...
Article
Full-text available
The aim of this study was to characterize the feeding behavior of the Guiana dolphin, S. guianensis, through description and quantification of the strategies used by the dolphins, and possibly to apply this patterns to other areas in its distribution. Data were collected during systematic boat surveys, between November/1996 and May/1997, with 120 h...
Article
Full-text available
Aiming to verify the movements of the bottlenose dolphin (Tursiops truncatus) at Rio de Janeiro State coast, southeastern Brazil, we performed a photoidentification comparison between the catalogued individuals of the Cagarras Archipelago (23° 02' S and 43° 12' W) in 2004 and 2006 (n = 26) and the images obtained (n = 179) during the Southeastern C...
Article
Full-text available
The ecology of the bottlenose dolphin (Tursiops truncatus) is scarcely documented in Brazil. The objective of this article is to present information about the distribution, group size and behavior of T. truncatus collected oportunistically around the Island of Santa Catarina. Locality, date and time, group size and behavior were registered after ea...
Article
Full-text available
The aim of this work is to describe the repertoire of calls utilized by the spinner dolphins (Stenella longirostris) in the southern Atlantic Ocean. We measured four acoustic parameters of the fundamental frequency of each call: (i) duration; (ii) frequency amplitude; (iii) minimum frequency; and (iv) maximum frequency. We also classified calls by...
Article
Full-text available
The Abrolhos Bank off Brazil is considered the main breeding ground for the humpback whale (Megaptera novaeangliae) in the Southwest Atlantic. However, owing to an increase in the occurrence of the species along the north coast of the State of Bahia, it has been suggested that the species is reoccupying that region, which was probably utilized by t...
Article
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Pygmy killer whales, Feresa attenuata were sighted for the first time off the Brazilian coast, SW Atlantic Ocean.
Article
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We report the occurrence of a lone humpback whale (Megaptera novaeangliae) calf inside Baía de Todos os Santos, north-eastern Brazil, encountered swimming near the shore at a busy beach of the city of Salvador. The calf was monitored for over six hours during which time it was photographed performing an unusual behaviour, interpreted by the authors...
Article
Full-text available
The information about cetacean occurrence around the Island of South Georgia is scarce. With the main goal of gathering information on a feeding ground of humpback whales (Megaptera novaeangliae) that winter in Brazilian waters, we conducted an expedition to South Georgia. We present here the information regarding cetacean sightings during the expe...
Article
Full-text available
The behavioral patterns of the estuarine dolphin, Sotalia guianensis (P. J. van Bénéden, 1864), were compared between two populations along the Brazilian coast: Caravelas (Bahia), along the eastern coast, and Norte Bay (Santa Catarina), along the southern coast. Applying the focal-group sampling in both areas, information such as the geographic pos...
Article
Dolphins of the genus Sotalia are found along the Caribbean and Atlantic coasts of Central and South America and in the Amazon River and most of its tributaries. At present, the taxonomy of these dolphins remains unresolved. Although five species were described in the late 1800s, only one species is recognized currently (Sotalia fluviatilis) with t...
Article
Full-text available
Otters are opportunistic feeders in that they feed upon whatever available prey. Sightings of live otters in their natural environment are uncommon, mainly because otters are known to have shy habits, avoiding human presence. Despite the fact that reptiles are listed in the neotropical otter´s diet, they just constitute a small part of it. This pap...
Article
Full-text available
Between April 2002 and April 2005, 210 estuarine dolphin groups were sighted, with 58 animals individually identified. Fifteen dolphins were photo-identified just once, while only two animals were sighted in 15 different months. Some individuals showed long-term residence (more than 3 y). Residence rates showed heterogeneity in the dolphin's perman...
Article
Full-text available
Dolphins of the genus Sotalia are found along the Caribbean and Atlantic coasts of Central and South America and in the Amazon River and most of its tributaries. At present, the taxonomy of these dolphins remains unresolved. Although five species were described in the late 1800s, only one species is recognized currently (Sotalia fluviatilis) with t...
Article
Full-text available
We present herein the first records of evidence of bottom contact behavior by Sotalia guianensis. From April 2002 to December 2004, boat cruises were conducted along a 135-km stretch of coast on the Abrolhos Bank, eastern coast of Brazil. Evidence of bottom contact behavior was observed directly or through photographs on 25 occasions during the stu...