A5107876343- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Marine animal studies overview
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Ichthyology and Marine Biology
- Coral and Marine Ecosystems Studies
- Marine and fisheries research
- Aquaculture disease management and microbiota
- Fish biology, ecology, and behavior
- Identification and Quantification in Food
- Marine and coastal plant biology
- Turtle Biology and Conservation
- Cosmology and Gravitation Theories
- Isotope Analysis in Ecology
- Cephalopods and Marine Biology
- Neutrino Physics Research
- Avian ecology and behavior
- Fish Biology and Ecology Studies
- Wildlife Ecology and Conservation
- Toxoplasma gondii Research Studies
- Animal Vocal Communication and Behavior
- Marine Ecology and Invasive Species
Heidelberg University
2020-2023
Universidade Estadual do Rio Grande do Sul
2014-2023
Kyushu University
2023
The University of Adelaide
2019-2022
University of Rio Grande and Rio Grande Community College
2022
Migration Institute of Australia
2021
Governo do Estado do Rio Grande do Sul
2013-2021
University of Massachusetts Amherst
2020
University of Chicago
2020
Fermi National Accelerator Laboratory
2020
The franciscana, Pontoporia blainvillei, is endemic to the western South Atlantic Ocean and perhaps one of most threatened small cetacean species in this region. This paper presents a first abundance estimate for coastal waters Rio Grande do Sul State (southern Brazil) Uruguay. In March 1996, an aerial survey was conducted along coast. Thirty-four franciscanas (29 groups) were recorded leading mean density 0.657 individuals/km2 (95% CI: 0.516 0.836) study area (435km2 ) after applying...
We succinctly review and document new cases of diseases the skin skeletal system external traumata in cetaceans from Ecuador, Colombia, Peru, Chile, Argentina, Uruguay, Brazil, Venezuela. The survey revealed 590 diagnosed with a significant pathology, injury or malformation on total 7635 specimens 12 odontocete species examined observed 1984-2007. Tattoo disease (TSD), lobomycosis-like (LLD) cutaneous unknown aetiology seem to be emerging several populations. TSD was confirmed eight SE...
Mortality of franciscana in fishing operations has been observed for almost sixty years. Reports on by-catch shark gillnet fisheries off Uruguay date back to the early forties (Van Erp, 1969). Although gillneting Argentina and southern Brazil also emerged as a consequence Second World War demands cheap protein vitamins (De Buen, 1950, 1952; Popovici Angelescu, 1954; Crespo et al., 1994; Haimovici 1997), no record exists those areas. Gillnet bottomdwelling fish became major conservation...
The patterns of habitat use by the franciscana dolphins ( Pontoporia blainvillei ) along its distribution are poorly known. This study investigates with respect to depth for 181 individuals different age, size, gender and reproductive condition off Rio Grande do Sul, southern Brazil. results reveal that franciscanas very homogeneously distributed according depth. Individuals from all lengths utilize nearly entire range depths surveyed area. Larger or older animals not deeper waters than...
The Dalitz decays eta -> e^+e^-g and omega pi^0 e^+e^- have been measured in the g p reactions, respectively, with A2 tagged-photon facility at Mainz Microtron, MAMI. value obtained for slope parameter of electromagnetic transition form factor eta, Lambda^{-2}_eta=(1.97+/-0.11_tot) GeV^{-2}, is good agreement previous measurements mu^+mu^-g decays. uncertainty Lambda^{-2}_eta lower than results based on decay. parameter, Lambda^{-2}_omega_pi^0 = (1.99+/-0.21_tot) somewhat mu^+mu^-, but are...
The franciscana dolphin has been considered the most threatened small cetacean in south-western Atlantic Ocean due to gillnet by-catch. estimation of species' abundance recommended as highest research priority. A line transect aerial survey estimate Rio Grande do Sul, southern Brazil, was carried out February 2004. overall surveyed area comprised 13,341 km 2 and at least 20 lines. Abundance estimated using distance sampling methods assuming g(0) = 0.304. corrected density is 0.51...
We report on the epidemiology of lobomycosis-like disease (LLD), a cutaneous disorder evoking lobomycosis, in 658 common bottlenose dolphins Tursiops truncatus from South America and 94 Indo-Pacific T. aduncus southern Africa. Photographs stranding records 387 inshore residents, 60 non-residents 305 specimens undetermined origin (inshore offshore) were examined for presence LLD lesions 2004 to 2015. Seventeen 3 1 dolphin unknown residence status positive. appeared as single or multiple,...
Abstract This study describes operational interactions between coastal gillnet fishing and South American sea lions ( Otaria flavescens ) off the southern Brazilian coast. In total, 263 onboard surveys were carried out during three periods 1992 2012 in boats from two harbours on northern coast of Rio Grande do Sul State: Passo de Torres (29°19'S; 49°43'W) Imbé (29°58'S; 50°07'W). Interactions observed 116 (24.0%) 484 operations. These more frequent (frequency occurrence FO = 42.8%) than...
As species recover from exploitation, continued assessments of connectivity and population structure are warranted to provide information for conservation management. This is particularly true in with high dispersal capacity, such as migratory whales, where patterns could change rapidly. Here we build on a previous long-term, large-scale collaboration southern right whales (Eubalaena australis) combine new (nnew) published (npub) mitochondrial (mtDNA) microsatellite genetic data all major...
Growth The asymptotic lengths of individuals the southern form P. blainvillei (distributed south 32oS) vary between 129.8cm and 136.4cm for males, 146.4cm 161.9cm females (Kasuya Brownell, 1979; Walter, 1997; Barreto et al., 2000). northern species north 27oS), has that 113.3cm 117.1cm 128.9cm 144.7cm (Rosas, 2000; Ramos 2000a; 2000b). These results corroborate populational differences in body size (smaller individuals) forms (larger based on osteological data (Pinedo, 1991) those from...
(Montagu 1821), is of worldwide distribution in tropical and temperate regions both coastal oceanic waters (WELLS; SCOTT, 2009). In the Southwestern Atlantic Ocean (SWA), species occurs from northern Brazilian coast (SICILIANO et al., 2008) to Tierra del Fuego, Argentina (GOODALL 2011).Despite wide SWA, information on bottlenose dolphin’s feeding habits this region relatively sparse. Only a comparatively small number specimens thus far been analyzed few studies published date, mainly...
The South American sea lion (Otaria flavescens) is widely distributed along the southern Atlantic and Pacific coasts of America with a history significant commercial exploitation. We aimed to evaluate population genetic structure evolutionary its distribution by analyses mitochondrial DNA (mtDNA) 10 nuclear microsatellites loci. analyzed 147 sequences mtDNA control region genotyped 111 individuals for microsatellite loci, representing six populations (Peru, Northern Chile, Southern Uruguay...
The genetic structure of bottlenose dolphin communities found along the southern Brazilian coast is reported in this study. Genetic analysis using biopsy samples from free ranging dolphins and tissue stranded revealed a fine-scale population among three distinct groups. first genetically group was composed resident Laguna with high degree site fidelity. second one photo-identified dolphin, previously recognised by its interaction fishermen, that near mouth Tramandaí Lagoon. Moderate nuclear...
We assessed the level of genetic variability and population structure common bottlenose dolphin (Tursiops truncatus) in tropical subtropical portions southwestern Atlantic Ocean compared results with previous morphological findings. analyzed 109 samples dolphins that were sequenced for control region mtDNA genotyped seven polymorphic microsatellite loci. The suggested species this can be separated two major biological units, northern southern, an area parapatry at southern Brazil. unit seems...
Marine mammals and humans are apex predators both may compete for fish in ecosystems under continuous fishing pressure. We assessed the degree of trophic overlap between prey species found diet 5 marine (39 specimens sea lion Otaria flavescens , 61 fur seals Arctocephalus australis 76 franciscana dolphins Pontoporia blainvillei 25 bottlenose Tursiops truncatus 28 Lahille’s T. gephyreus ) catches 6 main commercial gears used southern Brazil (coastal gillnets, oceanic purse seine, demersal...
Assessing environmental changes in Southern Ocean ecosystems is difficult due to its remoteness and data sparsity. Monitoring marine predators that respond rapidly variation may enable us track anthropogenic effects on ecosystems. Yet, many long-term datasets of are incomplete because they spatially constrained and/or already modified by industrial fishing whaling the latter half 20th century. Here, we assess contemporary offshore distribution a wide-ranging predator, southern right whale...
This study reports the first occurrence of partial albinism in two species Ariidae: Genidens barbus and planifrons from an estuary Southern Brazil. Possible causes simultaneous three specimens with are discussed, including random genetic alterations, chronic contamination effects small effective population size, which may favor expression recessive albino gene.
The occurrence of common bottlenose dolphins (Tursiops truncatus) in Tramandaí Estuary, southern Brazil, is described based on a photo-identification study conducted between January 2009 and February 2010. A total 128 survey days were with an average observation effort 2.6 hours per day (SD = 0.6). Approximately 2050 photographs taken from shore land location at the mouth estuary. nine identified, including three calves. observed during all seasons, greater frequency fall (79.3% days) winter...
Resumen.-Un análisis genético basado en secuencias de la región control del ADN mitocondrial fue realizado para investigar tanto identidad especie como estructura genética poblacional ballenas Bryde Sudamericanas.El se basó muestras históricas, biopsias y varamientos Chile (n= 10) Brasil 8).Para fines comparación, publicadas diferentes localidades los océanos Índico Pacífico (incluyendo Perú, n= 24) fueron incorporadas análisis.El filogenético identificó las América Sur Balaenoptera...