Science topic

Cetacea - Science topic

An order of wholly aquatic MAMMALS occurring in all the OCEANS and adjoining seas of the world, as well as in certain river systems. They feed generally on FISHES, cephalopods, and crustaceans. Most are gregarious and most have a relatively long period of parental care and maturation. Included are DOLPHINS; PORPOISES; and WHALES. (From Walker's Mammals of the World, 5th ed, pp969-70)
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Publications related to Cetacea (2,338)
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Indonesia is an archipelagic country that includes at least 17,000 islands.. Of the various islands, Indonesia has an island called Lembata which belongs to East Nusa Tenggara Province. In Lembata itself precisely in Lamalera known as the culture or tradition of Leva Nuang or Lewa, which is the tradition of hunting whales, rays, sharks, or those in...
Article
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Narwhals and belugas are toothed whales belonging to the Monodontidae. Belugas have a circumpolar Arctic and sub-Artic distribution while narwhals are restricted to the Atlantic Arctic. Their geographical ranges overlap during winter migrations in the Baffin Bay area (Canada/West Greenland) and successful interbreeding may occur. Here, we employed...
Article
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Parasite biodiversity in cetaceans represents a neglected component of the marine ecosystem. This study aimed to investigate the distribution and genetic diversity of anisakid nematodes of the genus Anisakis sampled in cetaceans from the Northeast Atlantic Ocean and the Mediterranean Sea. A total of 478 adults and pre-adults of Anisakis spp. was id...
Article
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The transition in Mysticeti (Cetacea) from capture of individual prey using teeth to bulk filtering batches of small prey using baleen ranks among the most dramatic evolutionary transformations in mammalian history. We review phylogenetic work on the homology of mysticete feeding structures from anatomical, ontogenetic, and genomic perspectives. Si...
Article
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The present work has been undertaken for predicting evolutionary relationship of marine mammals employing 16s rRNA mitochondrial genes of 63 species of Marine mammals of three Orders viz. Cetaceae (38 species), Carnivora (23 Species) and Sirenia (2 Species), downloaded from NCBI Genbank database revealed interesting results. To accomplish the task,...
Article
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Episodic memory involves the conscious recollection of personally experienced events, which has often been argued to be a uniquely human ability.1, 2, 3, 4, 5 However, evidence for conscious episodic recall in humans is centered around language-based reports. With no agreed upon non-linguistic behavioral makers of consciousness,⁶ episodic-like memo...
Article
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Sounds from down-the-hole pile installation contain both impulsive and non-impulsive components. Kurtosis values ( β) were determined for two datasets to investigate the impulsiveness of piling sounds. When the hammer struck the pile(s), β was 21–30 at 10 m and approximately 10 at 200 m. When the hammer was used for drilling without contacting the...
Preprint
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Extreme asymmetry of the skull is one of the most distinctive traits that characterizes toothed whales (Odontoceti, Cetacea). The origin and function of cranial asymmetry are connected to the evolution of echolocation, the ability to use high frequency sounds to navigate the surrounding environment. Although this novel phenotype must arise through...
Article
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The Humboldt Current Ecosystem (HCE) is one of the most productive marine ecosystems, sustaining one of the largest fishing industries in the world. Although several species of cetaceans are known to inhabit these productive waters, quantitative assessments of their abundance and distribution patterns are scarce and patchy. Here, we present the fir...
Article
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Nasopulmonary mites (NPMs) of the family Halarachnidae are obligate endoparasites that colonize the respiratory tracts of mammals. NPMs damage surface epithelium resulting in mucosal irritation, respiratory illness, and secondary infection, yet the role of NPMs in facilitating pathogen invasion or dissemination between hosts remains unclear. Using...
Article
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Eomysticetids are an extinct basal taxon of baleen whales (Mysticeti: Chaeomysticeti - ‘true whales’), which appeared during the Oligocene and reflected a transitional stage between the origin of baleen and the loss of teeth, a trait that characterizes extant baleen whales. The eomysticetids are recognized as a diverse and widely distributed lineag...
Article
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Ganges River dolphins echolocate, but this mechanism is inadequate for poor sonar-echoing objects such as the monofilament gillnets, causing considerable net entanglement related mortalities. Net entanglement related deaths are one of the major causes of cetacean population decline around the world. Experiments were carried out to understand the us...
Article
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Cetacean neuropathology is a developing field that aims to assess structural and neurochemical changes involved in neurodegenerative, infectious and traumatic processes, however markers used previously in cetaceans have rarely undergone systematic validation. This is a prerequisite to investigating the potential damage inflicted on the cetacean aud...
Article
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In the northern hemisphere, humpback whales ( Megaptera novaeangliae) typically migrate between summer/autumn feeding grounds at high latitudes, and specific winter/spring breeding grounds at low latitudes. Northeast Atlantic (NEA) humpback whales for instance forage in the Barents Sea and breed either in the West Indies, or the Cape Verde Islands,...
Article
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The Swiss Upper Marine Molasse (OMM) documents a transgression event dated to around 21 to 17 million years in which dolphin and other vertebrate remains have been reported. We revised the whole cetacean (whales and dolphins) OMM assemblage available in main collections, focusing on the identification and interpretation of periotics (bone that cont...
Article
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As an Arctic gateway, the Norwegian Sea sustains a rich diversity of seasonal and resident species of soniferous animals, vulnerable to the effects of climate change and anthropogenic activities. We show the occurrence of seasonal patterns of acoustic signals in a small canyon off Northern Norway, and investigate cetacean vocal behavior, human-made...
Article
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Humpback whales ( Megaptera novaeangliae ) perform seasonal migrations from high latitude feeding grounds to low latitude breeding and calving grounds. Feeding grounds at polar regions are currently experiencing major ecosystem modifications, therefore, quantitatively assessing species responses to habitat characteristics is crucial for understandi...
Article
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Twenty-three species and four subspecies of odontocete belonging to five families (Delphinidae, Physeteridae, Kogiidae, Phocoenidae, and Ziphiidae) are distributed along the Pacific coast of northern Mexico. The morphological variability of these species has been studied extensively and a number of taxonomic studies have focused on cranial characte...
Article
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Erysipelas, caused by Erysipelothrix rhusiopathiae, is considered one of the most serious infectious diseases of captive and free-ranging cetaceans worldwide, as these animals are known to be highly susceptible to the bacterial infections. The potential diversity between E. rhusiopathiae isolates from captive cetaceans has been previously described...
Article
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A notable diversity of marine mammals inhabits the Atlantic and Pacific waters of South America. For decades, South American countries have been producing scientific research focused on these species. However, still, there is no systematic assessment of the magnitude and main subjects on which this research has been focused. This study analyzes the...
Article
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Passive acoustic monitoring (PAM) has proven a powerful tool for the study of marine mammals, allowing for documentation of biologically relevant factors such as movement patterns or animal behaviors while remaining largely non-invasive and cost effective. From 2008–2019, a set of PAM recordings covering the frequency band of most toothed whale (od...
Article
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Many studies have revealed that animal vocalizations, including those from mammals, are individually distinctive. Therefore, acoustic identification of individuals (AIID) has been repeatedly suggested as a non-invasive and labor efficient alternative to mark-recapture identification methods. We present a pipeline of steps for successful AIID in a g...
Article
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Significance Acoustic signals travel efficiently in the marine environment, allowing soniferous predators and prey to eavesdrop on each other. Our results with four cetacean species indicate that they use acoustic information to assess predation risk and have evolved mechanisms to reduce predation risk by ceasing foraging. Species that more readily...
Article
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A review of the morphological patterns exhibited by all the main radiations of mysticete (baleen whale) cetaceans provided a broad assessment of the fundamental morphological transformations that occurred in the transition to the Mysticeti clade. Skull and postcranial characters were illustrated, described and compared, and their distribution was m...
Preprint
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The transition in Mysticeti (Cetacea) from capture of individual prey using teeth to bulk filtering batches of small prey using baleen ranks among the most dramatic evolutionary transformations in mammalian history. We review phylogenetic work on the homology of mysticete feeding structures from anatomical, ontogenetic, and genomic perspectives. Si...
Article
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An incomplete cranium, three cervicals (including the axis) and two likely lumbars of a monodontid cetacean are here described from lower Pliocene (ca. 5.1-4.5 Ma) marine sandstones cropping out at Arcille (Grosseto Province, Tuscany, Italy). This fossil find comes from the same locality as the holotype of Casatia thermophila, which it resembles in...
Article
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Irrawaddy Dolphin, Orcaella brevirostris (Owen in Gray, 1866), has been reported in the waters of Berbak Sembilang National Park, Indonesia, since 1990. We used interview techniques, direct observations, and secondary data from the literature to show that this dolphin occurs on the east coast of South Sumatra from October to February. An Irrawaddy...
Preprint
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LOCUS XP_004283886 669 aa linear MAM 15-APR-2020 DEFINITION LIM domain-containing protein 1 isoform X1 [Orcinus orca]. ACCESSION XP_004283886 VERSION XP_004283886.1 DBLINK BioProject: PRJNA189949 DBSOURCE REFSEQ: accession XM_004283838.3 KEYWORDS RefSeq. SOURCE Orcinus orca (killer whale) ORGANISM Orcinus orca Eukaryota; Metazoa; Chordata; Craniata...
Article
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In recent years, a series of discoveries of a diverse early Eocene (~54.5 Ma) terrestrial mammal fauna from the open-cast lignite mines of western India (District Surat, Gujarat) have attracted global attention. The principal early Eocene mammal-bearing horizon in India occurs in the Cambay Shale, and is sandwiched between the two main hyperthermal...
Conference Paper
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The Republic of Croatia is one of the top European countries in terms of the number of mammal species. Out of total of 101 species, 90 are autochthonous, which position Croatia among 8 European countries with the highest mammal biodiversity. According to total number of mammal species in Europe (231 species), the fauna of Croatia makes up 44% of th...
Article
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In all mammals, the superior olivary complex (SOC) comprises a group of auditory brainstem nuclei that are important for sound localization. Its principal nuclei, the lateral superior olive (LSO) and the medial superior olive (MSO) process interaural time and intensity differences, which are the main cues for sound localization in the horizontal pl...
Article
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The adaptation of vertebrates to different environments was associated with changes in the molecular composition and regulation of epithelia. Whales and dolphins, together forming the clade cetaceans, have lost multiple epithelial keratins during or after their evolutionary transition from life on land to life in water. It is unknown whether the ch...
Article
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The domestic pig (Sus scrofa) is a species representative of the Suina, one of the four suborders within Cetartiodactyla. In this paper, we reported our analysis of the pig TRG locus in comparison with the loci of species representative of the Ruminantia, Tylopoda, and Cetacea suborders. The pig TRG genomic structure reiterates the peculiarity of t...
Article
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Two lumbar vertebrae, an isolated lumbar vertebra, and two endplates, possibly a thoracic (?) vertebra of the of a cetacean from the Basilosauridae family, found in 2020 and 2021 in the Upper Eocene light green clays of the Beloglinskaya Formation near the village of Gorny Luch, Apsheron District, Krasnodar Territory are described. In the shape and...
Article
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Large baleen and toothed whales play crucial ecological roles in oceans; nonetheless, very little is known about their intestinal microbiomes. Based on striking differences in natural history and thus in feeding behaviours, it can be expected that intestinal microbiomes of large baleen whales and toothed whales are different. To test this hypothesi...
Article
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Background Plesiosaurs, diapsid crown-group Sauropterygia, inhabited the oceans from the Late Triassic to the Late Cretaceous. Their most exceptional characteristic are four hydrofoil-like flippers. The question whether plesiosaurs employed their four flippers in underwater flight, rowing flight, or rowing has not been settled yet. Plesiosaur locom...
Article
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Body condition is a crucial and indicative measure of an animal’s fitness, reflecting overall foraging success, habitat quality, and balance between energy intake and energetic investment toward growth, maintenance, and reproduction. Recently, drone-based photogrammetry has provided new opportunities to obtain body condition estimates of baleen wha...
Research
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Perairan Indonesia memiliki lebih dari sepertiga jenis paus dan lumba-lumba dunia, termasuk juga beberapa jenis yang dikategorikan langka dan terancam punah. Beberapa jenis Cetacea yang menggunakan jalur migrasi melalui perairan Indonesia bagian Timur, antara lain Samudera Hindia dan Pasifik melalui perairan Kepulauan Komodo, Solor-Lembata (NTT), L...
Technical Report
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Las aves constituyen el grupo de vertebrados más estudiado. Cuentan con más de 9,000 especies que se distribuyen por todo el planeta, siendo este el grupo de vertebrados más numeroso, únicamente por detrás de los peces. Las aves habitan bosques, desiertos, montañas, praderas y océanos, siendo este último el que más habitan. Las aves presentan adapt...
Preprint
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1. Three-dimensional measurements of morphology are key to gaining an understanding of a species’ biology and to answering subsequent questions regarding the processes of ecology (or palaeoecology), function, and evolution. However, the collection of morphometric data is often focused on methods designed to produce data on bilaterally symmetric mor...
Article
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Groups of pelagic dolphins and whales (order Cetacea) regularly strand on beaches throughout the world. These strandings are referred to as mass stranding events (MSEs). MSEs have been observed for centuries, however the underlying causes remain unclear. In Cape Cod, Massachusetts, USA, MSEs usually involve only a few species of cetaceans. We inves...
Article
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The northward-flowing Humboldt Current hosts perpetually high levels of productivity along the western coast of South America. Here, we aim to elucidate the deep-time history of this globally important ecosystem based on a detailed palaeoecological analysis of the exceptionally preserved middle–upper Miocene vertebrate assemblages of the Pisco Form...
Article
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In mammals, the photopigment melanopsin (Opn4) is found in a subset of retinal ganglion cells that serve light detection for circadian photoentrainment and pupil constriction (i.e., mydriasis). For a given species, the efficiency of photoentrainment and length of time that mydriasis occurs is determined by the spectral sensitivity and deactivation...
Article
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Vestigial organs are historical echoes of past phenotypes. Determining whether a specific organ constitutes a functional or vestigial structure can be a challenging task, given that distinct levels of atrophy may arise between and within lineages. The mammalian pineal gland, an endocrine organ involved in melatonin biorhythmicity, represents a clas...
Article
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Córdoba es uno de los departamentos de la región Caribe colombiana con mayor atención en el estudio de los mamíferos, lo cual ha permitido ampliar el listado previo que incluía 117 especies. Gracias al desarrollo de nuevos trabajos de campo en zonas no exploradas, revisión de colecciones biológicas y los cambios taxonómicos, la diversidad de mamífe...
Article
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The present review assesses the potential neural impact of impoverished, captive environments on large-brained mammals, with a focus on elephants and cetaceans. These species share several characteristics, including being large, wide-ranging, long-lived, cognitively sophisticated, highly social, and large-brained mammals. Although the impact of the...
Article
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(300 mots) We present the first description of the endocranial cast of the small raoellid artiodactyl Indohyus indirae. Raoellidae are sister group to Cetacea and the new morphological observations allow for outlining some of the early steps of the evolutionary history of the cetacean brain. The combination of primitive artiodactyl features and typ...
Article
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In the Amazon, mercury (Hg) contamination comes from ASGM operations along with soil remobilization processes associated with deforestation. The objective of this study was to evaluate the exposure to methylmercury (MeHg) and total mercury (THg) in 88 samples of skin and blubber tissue obtained from live captured river dolphins (Inia boliviensis, I...
Article
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Lysozyme enzymes provide classic examples of molecular adaptation and parallel evolution, however, nearly all insights to date come from c-type lysozymes. G-type lysozymes occur in diverse vertebrates, with multiple independent duplications reported. Most mammals possess two g-type lysozyme genes (Lyg1 and Lyg2), the result of an early duplication,...
Article
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Cetacea is a clade well-adapted to the aquatic lifestyle, with diverse adaptations and physiological responses, as well as a robust antioxidant defense system. Serious injuries caused by boats and fishing nets are common in bottlenose dolphins (Tursiops truncatus); however, these animals do not show signs of serious infections. Evidence suggests an...
Article
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Harbor porpoises (Cetacea) are present in the North Sea throughout the year but periodically enter adjacent estuaries, which due to human activities are among the planet's most threatened aquatic systems. However, the occurrence of harbor porpoises in estuaries has rarely been studied. In this work, harbor porpoise occurrence at two stations in the...
Article
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The Miocene Pisco Formation, broadly exposed in the Ica Desert of southern Peru, is among the most outstanding Cenozoic marine Fossil-Lagerstätten worldwide. It is renowned for its exceptional preservation and abundance of vertebrate fossils, including a rich assemblage of whales and dolphins (Cetacea). Here, we integrate taphonomic data on 890 mar...
Article
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Most cetaceans are born with vibrissae but they can be lost or reduced in adulthood, especially in odontocetes. Despite this, some species of odontocetes have been found to have functioning vibrissal follicles (including the follicle itself and any remaining vibrissal hair shaft) that play a role in mechanoreception, proprioception and electrorecep...
Article
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A new analysis of the "type" Plesiocetus collection established by Van Beneden in the 19 th century is performed to provide an updated taxonomy of this genus. Plesiocetus was established based on isolated finds that were assembled together to reconstruct almost complete skeletons of four species: P. brialmontii, P. dubius, P. hupschii, and P. burti...
Article
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Dolphins are rarely observed in the Baltic Sea, making only sporadic appearances as a result of their migrations. The study included six specimens: four white-beaked dolphins Lagenorhynchus albirostris and two striped dolphins Stenella coeruleoalba. Their gastrointestinal tracts were found to contain the nematodes Anisakis simplex (in both species)...
Chapter
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Cetaceans are aquatic mammals, large-headed, hairless, and torpedo-shaped mammals with a complex stomach comprising of at least four chambers. There are 90 species belonging to the order Cetacea; examples include dolphins, porpoises, and whales (Smith et al. 2003). Cetacean health encompasses the sum of all biological, social, and environmental in...