Humberto Luis Cappozzo

Humberto Luis Cappozzo
Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" · Laboratorio de Ecología, Comportamiento y Mamíferos Marinos

Doctor en Ciencias Biológicas

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100
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Introduction
Skills and Expertise

Publications

Publications (100)
Article
Full-text available
Macro-elements such as potassium (K), sodium (Na), chlorine (Cl), magnesium (Mg), and calcium (Ca) are essential in marine mammals’ nutrition. These elements are involved in physiological processes. Upon consumption, they are assimilated and accumulate in tissues. For the first time, they were detected in lung, spleen, liver, kidney, muscle, uterus...
Conference Paper
Full-text available
La ballena jorobada solía tener una presencia esporádica a lo largo de la costa de la Provincia de Buenos Aires (PBA), Argentina. A partir del año 2018 los avistamientos y varamientos han aumentado notablemente. El objetivo del presente trabajo es realizar una recopilación de los registros de ballena jorobada en la PBA, identificando: tendencias, e...
Article
Full-text available
On a global scale, cetaceans are recognized well indicators of marine ecosystem health. Trace elements accumulate in their bodies and potentially constitute a toxicological threat. Here, the concentrations of essential Se; unknown physiological elements Br, Rb, Cs, Ni, and Sr; and pollutants arsenic, Cd, Hg, and Ag were assessed in the skin of fals...
Article
The Pleistocene glacial period shaped the current genetic structure of numerous species. The last glacial dynamics has been proposed to have split the South American sea lion, Otaria flavescens, into two Evolutionarily Significant Units (ESUs), one on each side of the continent. However, previous studies have not provided genetic information on col...
Article
The main aim of this work was to evaluate historical changes in the foraging ecology of Lahille's bottlenose dolphin (Tursiops truncatus gephyreus) along its distributional range. Stable isotopes of carbon (δ¹³C) and nitrogen (δ¹⁵N) were analyzed in bone samples from specimens deposited in scientific institutions from Brazil (BR), Uruguay (UY) and...
Article
Cetacean populations are vulnerable to decline due to anthropogenic threats and life history traits. The Franciscana dolphin (Pontoporia blainvillei) has been considered the most affected small dolphin in the Southwestern Atlantic Ocean. In this study a method is presented for estimating the growth rate of the Franciscana dolphin affected by incide...
Article
The choice of sampling method is essential in the development of a population genetic study. This choice influences the type of samples that can be obtained and, therefore, the quality of the extracted DNA. Sampling methods can be classified into invasive, non-invasive, and minimally invasive. This last category is preferred, as it minimizes handli...
Article
Silver (Ag) is a non-essential metal known to bioaccumulate in aquatic organisms. We determined Ag concentrations in five false killer whales stranded in South America. Silver concentrations (in dry weight basis) range as 6.62-10.78 μg g −1 in liver, 0.008-7.41 μg g −1 in spleen, 0.004-5.71 μg g −1 in testis, 0.757-1.69 μg g −1 in kidney, 0.011-0.0...
Article
Metals accumulated in the tissues of organisms inhabiting marine ecosystems generally reflect their bioavailable levels within that environment. The aim of this work was to study the presence and concentration of metals (Cd, Cr, Cu, Fe, Ni, Pb and Zn) and its bioaccumulation in liver-ink sac (n = 12) and muscle (n = 12) tissues of loliginid squids,...
Article
The study was carried out to determine Hg and Se concentrations in false killer whales stranded on the Estrecho de Magallanes, Chile, South America. Tissue samples of five mature specimens were analyzed (two females and three males). Mean Hg concentration in liver 1068 (234) μg g−1 dry weight (DW) (standard deviation in parenthesis) was markedly hi...
Article
Full-text available
The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ13C and δ15N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of differences between sample locations. The results...
Article
The franciscana dolphin Pontoporia blainvillei is the most endangered small endemic cetacean species of the southwestern South Atlantic Ocean. We assessed intra-specific variation in the diet of franciscana regarding biological parameters (sex, total body length, age class and sexual maturity) and between distinct environments (open marine area vs....
Article
Full-text available
The skin of cetaceans is the most accessible tissue, and its sampling has been proposed as a noninvasive method to evaluate trace element concentrations in free-ranging populations. In the present work, concentrations of essential (Cl, Na, K, Mg, Fe, Zn, Mn and Co), nonessential (As and Ag), and of unknown essentiality (Br, Rb and Cs) elements were...
Conference Paper
Disentangling the intricacies governing prey selection and dietary breadth in wild predators are important for understanding their role in structuring ecological communities and provides critical information for the management and conservation of ecologically threatened species. Here, we combined dietary analysis, nutritional composition analysis o...
Article
Comparisons of skull shape between closely related species can provide information on the role that phylogeny and function play in cranial evolution. We used 3D-anatomical landmarks in order to study the skull ontogeny of two closely related species, Lagenorhynchus obscurus and Lagenorhynchus australis, with a total sample of 52 skulls. We found sh...
Article
Full-text available
The franciscana dolphin, Pontorporia blainvillei, is an endemic cetacean of the Atlantic coast of South America. Its coastal distribution and restricted movement patterns make this species vulnerable to anthropogenic factors, particularly to incidental bycatch. We used mitochondrial DNA control region sequences, 10 microsatellites, and sex data to...
Article
Full-text available
The South American fur seal (SAFS) is distributed from Peru (Pacific Ocean) to Uruguay (Atlantic Ocean). However, there is a section of coastline of about 2,300 km along the Chilean coast where no SAFS are recorded. Based on morphological comparisons 3 geographic forms have been reported (Peruvian, South Chilean, Atlantic), whereas preliminary gene...
Article
Full-text available
The Franciscana dolphin Pontoporia blainvillei is characterized by a long rostrum, a feature that is shared with the families formerly classified as river dolphins (Pontoporiidae, Platanistidae, Iniidae, Lipotidae). Although there are occasional reports on the existence of beak deformations, very little published information exists describing this...
Article
Including a multi-year collection of samples (2004–2011) the present research fills 20 years of an information gap regarding the PCB burden in south-west Atlantic franciscana dolphins (Pontoporia blainvillei) while aiming to test the null hypothesis that PCBs congeners are increasingly bioaccumulating in south-west Atlantic specimens in relation to...
Article
The franciscana dolphin, Pontoporia blainvillei, is endemic to the coastal waters of the southwestern Atlantic Ocean and the most endangered dolphin in the area. Four Franciscana Management Areas (FMAs) are currently recognised; however, results of genetic studies suggest the requirement for additional FMAs and highlight the need for more detailed...
Article
Full-text available
We explored the potential of using energy-dispersive X-ray analysis (EDX), a non-destructive technique, to assess elemental contents in dolphin bones. Specimens were deposited in museum collections, and prepared by different methodologies. Fifty eight Commerson’s dolphins (Cephalorhynchus c. commersonii) chevron bones and 24 Franciscana dolphins (P...
Article
Full-text available
We explored the potential of using energy-dispersive X-ray analysis (EDX), a non-destructive technique, to assess elemental contents in dolphin bones. Specimens were deposited in museum collections, and prepared by different methodologies. Fifty eight Commerson’s dolphins (Cephalorhynchus c. commersonii) chevron bones and 24 Franciscana dolphins (P...
Conference Paper
Full-text available
Several cetaceans’ species are subjected to anthropogenic threats and posses life history traits that make them vulnerable to population declination. The Franciscana dolphin is a small dolphin in the Southwestern Atlantic Ocean, critically affected by incidental fishery mortality (or bycatch) along their coastal distribution from Argentina to Brazi...
Article
Full-text available
Due to anthropogenic factors, the franciscana dolphin, Pontoporia blainvillei, is the most threatened small cetacean on the Atlantic coast of South America. Four Franciscana Management Areas have been proposed: Espiritu Santo to Rio de Janeiro (FMA I), São Paulo to Santa Catarina (FMA II), Rio Grande do Sul to Uruguay (FMA III), and Argentina (FMA...
Article
Full-text available
The ovaries of 31-franciscana dolphins (19 immature and 12 mature) by-caught in coastal waters of Argentina were examined to describe the reproductive biology. No ovarian polarity was found, both ovaries were functional and showed similar amount of corpora. A positive trend was observed between the number of corpora and age (3–8 yr old), indicating...
Article
Full-text available
Including a multi-year collection of samples (2004–2011) the present research fills 20 years of an information gap regarding the PCB burden in south-west Atlantic franciscana dolphins (Pontoporia blainvillei) while aiming to test the null hypothesis that PCBs congeners are increasingly bioaccumulating in south-west Atlantic specimens in relation to...
Article
Full-text available
Including a multi-year collection of samples (2004–2011) the present research fills 20 years of an information gap regarding the PCB burden in south-west Atlantic franciscana dolphins (Pontoporia blainvillei) while aiming to test the null hypothesis that PCBs congeners are increasingly bioaccumulating in south-west Atlantic specimens in relation to...
Article
Full-text available
Cranial suture closure and its bilateral asymmetry in the franciscana dolphin, Pontoporia blainvil-lei, were studied. Our results showed that the closure of cranial sutures exhibit low variability associated to total body size, with the exception of the premaxilla-maxilla suture which showed some correlation with body size. The cranial sutures of f...
Chapter
Full-text available
La plataforma submarina y la costa atlántica argentina durante los últimos 22.000 años El ascenso del nivel del mar en la costa de la provincia de Buenos Aires La corriente de Malvinas.Ramas y frentes oceánicos en el mar patagónico El impacto del Plata sobre el océano Atlántico Efecto de la radiación ultravioleta sobre los ecosistemas acuáticos Atr...
Article
The aim of this work was to study the postnatal ontogenetic development of Pontoporia blainvillei skull, identifying major changes on shape, and relating them to relevant factors in the life history of the species. We analyzed a complete ontogenetic series (73♂, 83♀) with three-dimensional geometric morphometric techniques. Immature dolphins showed...
Article
We analysed the cranial ontogeny of male Arctocephalus australis (Zimmermann, 1783) (N = 116), Arctocephalus gazella (Peters, 1875) (N = 69), and Arctocephalus tropicalis (Gray, 1872) (N = 51) to study skull growth and its allometric patterns in the genus. We used 15 metric variables with bivariate and multivariate approaches to detect interspecifi...
Conference Paper
Full-text available
El delfín franciscana es una especie endémica de la costa Atlántica de América del Sur. Se distribuye desde Espíritu Santo (Brasil) hasta Río Negro (Argentina). Está clasificada como " Vulnerable " por la IUCN desde 2008. En base a distintas características de la especie, incluyendo análisis genéticos, su área de distribución se dividió en cuatro u...
Article
Full-text available
The present study provides information about the diet composition of franciscana dolphin, Pontoporia blainvillei, from southern Buenos Aires coast, Argentina. From 2003 to 2011 we collected 66 franciscana dolphins that were incidentally entangled in artisanal fishing nets. We analyzed the stomach contents and estimated the prey size in order to eva...
Article
Pectoral flippers of cetaceans function to provide stability and maneuverability during locomotion. Directional asymmetry (DA) is a common feature among odontocete cetaceans, as well as sexual dimorphism (SD). For the first time DA, allometry, physical maturity, and SD of the flipper skeleton—by X-ray technique—of Pontoporia blainvillei were analyz...
Article
Full-text available
The franciscana dolphin (Pontoporia blainvillei) is a small coastal dolphin endemic to the Southwestern Atlantic Ocean. Incidental captures in fishing gillnets is possibly the greatest conservation concern for this species and occurs within most of its geographical distribution. The aim of this paper was to determine the biological parameters o...
Chapter
Planet Earth is the most unusual one among the known planets since 71% of its surface is covered by oceans full of life. Life originated and diversified in the oceans along millions of years. At present, the oceans are largely responsible for sustaining planet life and in regulating the climate (IUCN 2009, Hoegh-Guldberg and Bruno 2010).
Article
Full-text available
Analysing a 529 bp segment of the mitochondrial control region, we evaluated the role that Pleistocene glaciations may have had in shaping the genetic structure currently found in the two southernmost breedingareas of the South American fur seal, Arctocephalus australis. Additionally, we analysed if these two breedingareas correspond to different c...
Conference Paper
Full-text available
Los calamares del género Loligo cumplen un rol ecológico y económico significativo en los ecosistemas marinos costeros del planeta ya que muchas especies son blancos de las pesquerías y representan un eslabón clave en las redes tróficas marinas. En particular, Loligo sanpaulensis es una especie nerítica que habita aguas costeras de hasta 60 mt de p...
Conference Paper
Full-text available
El delfín franciscana es endémico de la costa Atlántica de América del Sur. Se distribuye desde Espíritu Santo (Brasil) hasta Río Negro (Argentina). Esta especie está clasificada como " Vulnerable " por la IUCN. En base a distintas características de la especie, incluyendo análisis genéticos, su área de distribución se dividió en cuatro unidades de...
Chapter
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https://www.taylorfrancis.com/books/e/9780429073854
Conference Paper
Full-text available
Introducción Los cetáceos son un grupo de mamíferos completamente adaptado a la vida acuática. Las extremidades anteriores son amplias aletas con un borde fino que minimizan la resistencia durante el nado, y cumplen un rol fundamental en la locomoción, particularmente en la estabilidad y maniobrabilidad (Fish, 1996). El delfín franciscana, Pontopor...
Article
Total mercury (THg) and selenium (Se) concentrations were determined in hepatic, renal, and muscle tissues of seven specimens of Commerson’s dolphins incidentally captured in artisanal fisheries of Tierra del Fuego, Argentina, by instrumental neutron activation analysis. Liver yielded the mean highest concentration of THg 9.40 (9.92) μg g−1 dry wei...
Article
Full-text available
Franciscana dolphin,Pontoporia blainvillei, is a small and ‘vulnerable’ cetacean, which exhibits coastal marine habits according to the IUCN (2008). The aim of this work was to determine the presence of essential (Zn and Cu) and non-essential (Cd, Pb, Cr and Ni) heavy metals in skin (n=33) and muscle (n=36) tissues of franciscana dolphins from sout...
Article
Full-text available
Pontoporia blainvillei (Gervais and d'Orbigny, 1844) is an endangered small cetacean endemic to South America with four Franciscana Management Areas (FMA) recognized as different population stocks. The role of the intestinal parasite Synthesium pontoporiae (Digenea: Brachycladiidae) as a possible biological marker to differentiate P. blainvillei st...
Article
Full-text available
In Argentina, the franciscana dolphin is one of the most vulnerable cetaceans regularly entangled in coastal artisanal fishery nets. The aim of this paper is to estimate the species' incidental mortality on the Southern coast of Buenos Aires province through interviews with the captains of artisanal fishing vessels, in the period 2006-2009. Francis...
Article
Full-text available
The present study shows the considerable concentrations of heavy metals found in the liver of franciscana dolphins (n=24) by-caught between 2001 and 2007 in four localities of Buenos Aires province. Concentration of heavy metals such as Zn, Cu, Pb, Cd and Ni were manifested in the four assessed localities, yet Cr was only detected in one of them, N...
Conference Paper
Full-text available
Resumen El delfín franciscana, Pontoporia blainvillei es un cetáceo de hábitos marino-costeros endémico del Océano Atlántico Sudoccidental cuyo estado de conservación es "Vulnerable". El objetivo fue determinar la presencia de metales pesados (Cd, Pb, Zn, Cu, Cr y Ni) en los tejidos epitelial (n= 33) y muscular (n= 36) en el sur de la costa bonaere...
Article
As the first study to investigate reproductive aspects of male franciscana dolphin -Pontoporia blainvillei - in Argentine waters, the aim of this paper was to assess sexual maturity by using histological and morphometric methods. P. blainvillei was labeled as "Vulnerable" by the IUCN in 2008. The specimens analyzed were either incidentally caught i...
Article
Full-text available
RESUMEN. En este estudio se determinó los niveles de metales pesados (Cd, Pb, Zn, Cu, Cr y Ni) en el tejido renal del delfín franciscana, Pontoporia blainvillei, y se estableció la influencia de los parámetros ecológicos y biológicos sobre la bioacumulación de estos elementos. Se analizaron muestras de 38 ejemplares colectados entre 2004 y 2010 en...
Article
Full-text available
Heavy metal (Cd, Pb, Zn, Cu, Cr,Ni) concentrations were determined in the kidney tissue of the Franciscana dolphin, Pontoporia blainvillei, and the influence of ecological and biological parameters on the bioaccumulation of these elements was established. Samples from 38 specimens, collected between 2004 and 2010 off southern Buenos Aires, Argentin...
Article
Full-text available
The mating system of the Mediterranean monk seal was studied combining the use of diverse technologies. Sexual dimorphism in size was limited. Sexual activity was only observed to occur in the water. The different segments of the population segregated spatially: females, pups, and juveniles aggregated inside two main caves, whose entrances were con...
Article
Full-text available
In this paper we report an investigation of the utility of coprological analysis as an alternative technique to study parasite specificity whenever host sampling is problematic; acanthocephalans from marine mammals were used as a model. A total of 252 scats from the South American sea lion, Otaria flavescens, and rectal faeces from 43 franciscanas,...