Relevant bibliographies by topics / La Plata dolphin

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'La Plata dolphin'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "La Plata dolphin"

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Laporta, Paula, Pedro Fruet, and Eduardo Secchi. "First estimate of common bottlenose dolphin (Tursiops truncatus) (Cetacea, Delphinidae) abundance off Uruguayan Atlantic coast." Latin American Journal of Aquatic Mammals 11, no. 1-2 (January 8, 2017): 144–54. http://dx.doi.org/10.5597/00223.

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The common bottlenose dolphin Tursiops truncatus is often observed throughout the oceanic coast of Uruguay. Historically, its distribution was wider, including the estuary of the Río de la Plata, but currently its occurrence seems to be restricted mainly to the Uruguayan Atlantic coast (Rocha Department). Conflicting interests and tradeoffs between conservation and development are being generated in Uruguay. On one hand, the establishment of protected areas, responsible tourism and sustainable fisheries are promoted, while on the other hand, foreign exploitation of natural resources and development of mega-infrastructure in coastal zone are facilitated. In this work, we provide the first estimate of bottlenose dolphin’s abundance along the Uruguayan Atlantic coast. These results can be used as baseline information for monitoring population trends and guiding conservation actions for bottlenose dolphins in Uruguay. Mark-recapture models were applied to data of photoidentified animals with long-lasting natural marks. Total population size estimates of 63 individuals (95% CI = 54–74) and 61 (95% CI = 53–73) were obtained from closed and open population models, respectively. Although the estimates are within the range of values obtained for other coastal bottlenose dolphin populations in the Southwest Atlantic Ocean, as well as other regions of the world, it is lower than the values reported for populations inhabiting open habitats. This small population is probably vulnerable to non-natural removals, environmental and demographic stochasticity. Therefore, precautionary actions are recommended given the planned development for this coastal region.
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Fung, Christian, A. Schleicher, T. Kowalski, and H. H. A. Oelschläger. "Mapping auditory cortex in the La Plata dolphin (Pontoporia blainvillei)." Brain Research Bulletin 66, no. 4-6 (September 2005): 353–56. http://dx.doi.org/10.1016/j.brainresbull.2005.02.019.

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Huggenberger, Stefan, Thomas J. Vogl, and Helmut H. A. Oelschläger. "Epicranial complex of the La Plata dolphin (Pontoporia blainvillei): Topographical and functional implications." Marine Mammal Science 26, no. 2 (April 2010): 471–81. http://dx.doi.org/10.1111/j.1748-7692.2009.00349.x.

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Waterbolk, Maurits, Jasper Tump, Rianne Klaver, Rosalie van der Woude, Daniel Velleman, Joost Zuidema, Thomas Koch, and Elenna Dugundji. "Detection of Ships at Mooring Dolphins with Hidden Markov Models." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 4 (March 22, 2019): 439–47. http://dx.doi.org/10.1177/0361198119837495.

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IJpalen near the lock in IJmuiden are of great economic value to the Port of Amsterdam. These mooring dolphins have to endure a considerable amount of kinetic forces which can have an impact on the condition of the dolphins. These forces are created by either mooring or already moored ships. Any irregularities taking place at the IJpalen can have disastrous results unless timely addressed. The Port of Amsterdam has attached sensors to the poles and the plates, which measure changes in the dimensions regarding the dolphins. This report explores whether combining sensor data from the IJpalen and automatic identification system (AIS) data can produce beneficial insights into the dolphins’ states. We have used the sensor dataset to build a hidden Markov model (HMM) which predicts whether a ship is moored. We evaluated these results using the AIS data, in which can be discovered when a ship was moored at the IJpalen, producing remarkable results. We analyzed the sensor values using descriptive statistics to discover the normal and problem values. This research has obtained the following findings. First, descriptive statistics indicate a normal value range for the sensor values. Whenever a value out of this range is observed, it could be a problem case. Finally, it is possible to detect whether a ship is moored in the sensor data. An HMM on the z-angle of the plate of the east dolphin produces the best prediction, i.e., the highest accuracy of 90.2% according to the evaluation method, of a moored ship at the IJpalen.
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Artecona, Florencia, Maite De María, Leandro Bergamino, and Diana Szteren. "A historical perspective of niche differentiation between two top predators in the Uruguayan coastal area." Wildlife Research 46, no. 2 (2019): 136. http://dx.doi.org/10.1071/wr17188.

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Context As top predators, marine mammals play a key role consuming in different trophic levels and the trophic niche characterization may help to understand how species utilize and share resources . On the coast of the Río de la Plata and the South-west Atlantic, the South American sea lion (Otaria flavescens) and the franciscana dolphin (Pontoporia blainvillei) are two important predators. Aims The present study investigated potential trophic overlap of both species by measuring stable carbon (δ13C) and nitrogen (δ15N) isotopes over two periods: historical (1959–79) and recent (2002–15) on the Uruguayan coast. Methods Bone samples of P. blainvillei and O. flavescens were used to determine the isotopic niche using the Stable Isotope Bayesian Ellipses in R (SIBER) analysis. Key results The isotopic niche did not overlap between species in any period. δ15N was higher in O. flavescens in both periods (20.29‰±0.73 in the historical and 19.95‰±1.0 in the recent period), indicating that it feeds at a higher trophic level than P. blainvillei. The δ13C was also significantly higher in O. flavescens than in P. blainvillei during the two periods (O. flavescens: –11.43±0.6‰ historic, –12.72±0.4‰ recent, and P. blainvillei: –12.69±1.1‰ historic, –13.84±1.3‰ recent). The isotopic niche areas of P. blainvillei in recent and historic periods confirmed they forage in 2 distinct environments, marine and estuarine, with low isotopic overlap. This overlap was higher in the recent period. Conclusions and Implications O. flavescens and both P. blainvillei groups were segregated in both periods, with a higher overlap in the recent. These species appear to reduce competition by using different resources in the same coastal habitat. O. flavescens preferentially feeds on benthic fish and showed wider trophic amplitude in both periods, whereas P. blainvillei has a more coastal–pelagic diet and included a greater variability of resources in its diet. The differences between species trophic niches can still be detected after both marine mammals species abundance has declined and after the development of fisheries.
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Kylin, Henrik. "Birds and mammals off the northern coast of Argentina: first report of an association between birds and a feeding Pygmy Right Whale Caprea marginata." Ornis Svecica 23, no. 3–4 (October 1, 2013): 117–22. http://dx.doi.org/10.34080/os.v23.22572.

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When the icebreaker Oden passed between 39°36'S, 57°46'W and 39°59'S, 58°11'W on 20 November 2007, an extraordinary observation was made. A feeding Pygmy Right Whale Caprea marginata, a species rarely seen, was attended by eight Grey Phalaropes Phalaropus fulicarius, two Slender-billed Prions Pachyptila belcheri, and four Wilson’s Storm Petrels Oceanites oceanicus. The birds returned to feed around the head of the whale every time it surfaced, presumably copepod plankton straining out between the baleen. The site is off Rio de la Plata estuary where nutrient rich freshwater meets cold water of the Malvinas (Falkland) Current, creating a hotspot with high levels of plankton food. The conditions were extraordinarily favourable for observation with a calm sea, no wind and only a very weak swell. Six multispecies feeding groups were seen with a total of 42 species of birds, eleven species of whales, dolphins and porpoises, and three species of seals. Dusky Dolphins Lagenorhynchus obscurus and Great Shearwaters Puffinus gravis were predominant in the groups.
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Barbosa, Ana Paula Moreno, Paula Méndez-Fernandez, Patrick Simões Dias, Marcos César Oliveira Santos, Satie Taniguchi, and Rosalinda Carmela Montone. "Transplacental transfer of persistent organic pollutants in La Plata dolphins (Pontoporia blainvillei; Cetartiodactyla, Pontoporiidae)." Science of The Total Environment 631-632 (August 2018): 239–45. http://dx.doi.org/10.1016/j.scitotenv.2018.02.325.

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Trieu, Dung C., Ryosuke Yamasaki, and Yoshimichi Hagiwara. "Drags Acting on a Wavy Plate with Symmetrical Ridgelines Simulating Folded Skins of Dolphins." Journal of Aero Aqua Bio-mechanisms 3, no. 1 (2013): 29–35. http://dx.doi.org/10.5226/jabmech.3.29.

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Ibiapina, Deolino J., Paula V. Oltramari-Navarro, Ricardo L. Navarro, Marcio R. Almeida, Daniela L. Mendonça, and Ana CCF Conti. "Assessment of Dental Arch Changes and Buccal Bone Thickness in Patients treated with Self-ligating Brackets." Journal of Contemporary Dental Practice 17, no. 6 (2016): 434–39. http://dx.doi.org/10.5005/jp-journals-10024-1868.

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ABSTRACT Aims To evaluate changes in transverse dimensions of upper arch and thickness of the buccal bone plate in patients undergoing orthodontic treatment during the leveling phase. Materials and methods Sixteen patients aged between 11 and 30 years, presenting with class I and II malocclusion, with minimum of 2 mm crowding treated without extraction, were divided into two groups: GI (n = 8), self-ligating brackets (Easyclip Aditek), and GII (n = 8), conventional preadjusted brackets (3M Unitek). The intercanines, interpremolar, and intermolar widths were measured in dental casts using a digital caliper, before (T1) and after 6 months of treatment (T2). Measurements of the thickness of the bone plate were performed by using cone-beam computed tomography (CBCT) scans and Dolphin three-dimensional program. Paired and nonpaired t tests were applied to analyze the results in and between the groups for the changes in the transversal arch dimensions and buccal bone thickness. Results In all statistical tests, the significance level was set at 5%. A nonsignificant increase in transverse dimensions and a slight reduction on thickness of the buccal bone plate were observed in both groups. Conclusion The dimensional changes of transverse and thickness of the bone plate during the initial phase of treatment were similar, regardless of the bracket design. Clinical significance It should be noted that the bracket design does not influence the treatment course regarding transversal dimensions and buccal bone thickness. How to cite this article Ibiapina DJ, Oltramari-Navarro PV, Navarro RL, Almeida MR, Mendonça DL, Conti ACCF. Assessment of Dental Arch Changes and Buccal Bone Thickness in Patients treated with Self-ligating Brackets. J Contemp Dent Pract 2016;17(6):434-439.
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Garcia-Garin, Odei, Asunción Borrell, Morgana Vighi, Alex Aguilar, Meica Valdivia, Enrique M. González, and Massimiliano Drago. "Long-term assessment of trace elements in franciscana dolphins from the Río de la Plata estuary and adjacent Atlantic waters." Science of The Total Environment 788 (September 2021): 147797. http://dx.doi.org/10.1016/j.scitotenv.2021.147797.

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Dissertations / Theses on the topic "La Plata dolphin"

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Secchi, Eduardo Resende, and n/a. "Modelling the population dynamics and viability analysis of franciscana (Pontoporia blainvillei) and Hector�s dolphins (Cephalorhynchus hectori) under the effects of bycatch in fisheries, parameter uncertainty and stochasticity." University of Otago. Department of Zoology, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070118.162020.

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Incidental mortality in fisheries, especially gillnets, is one of the most important causes of decline of many species of cetaceans around the globe. Local populations of franciscana, Pontoporia blainvillei, and Hector�s dolphins, Cephalorhynchus hectori, have been subject to high levels of mortality in gillnets for several decades. This is due to a combination of extensive overlap in distribution of these coastal dolphins and large numbers of fishing nets. Stage-specific population dynamic models (without environmental stochasticity) suggest that both species have a low potential for population growth of approximately 0.2% (95% CI: -3.7% to 4.2%) to 3.4% (95% CI: 1.6% to 6.4%) for franciscana and 0.85% (95% CI: -1.0% to 2.6%) for Hector�s dolphins. Although the two species have similar population growth rates, they result from different life history strategies. Franciscana has a relatively low adult survival rate (0.86; SD = 0.016) which is compensated by a relatively high reproductive potential. The latter is a combination of early reproduction and high fecundity. Hector�s dolphin has a low reproductive potential, which is a combination of late reproduction and low fecundity, which is probably compensated by a relatively high adult survival rate (0.92; SD = 0.02) Apparent differences in growth rate among franciscana populations are possibly due to a combination of varying population-specific reproductive potential and, in some populations, inaccuracy in parameter estimates. Inaccuracy in estimating natural survival rates is also a cause for the low growth rate of Hector�s dolphins. The estimated low population growth rates of these species are insufficient to compensate for current levels of fishing-related mortality in some local populations, especially when environmental and/or demographic stochasticity is considered. Under these circumstances Banks Peninsula population would have a negative mean population growth rate of 0.54% (95% CI: -2.2% to 0.9%) and would decrease below its initial size in approximately 74% of the simulations. Stochasticity alone would decrease considerably the probability of the Banks Peninsula population to grow and recover from past and current high bycatch levels. Effects of stochasticity were also high for one of the franciscana stocks (i.e. stock from Franciscana Management Area II). In other areas (e.g. West Coast of the South Island; franciscana stock from FMA I) fishing effort and bycatch mortality rate seem not to be impeding population growth. Even in a stochastic environment and under current levels of fishing effort, the West Coast population and the franciscana stock from FMA I would grow at a positive rate of 0.32% (95% CI: -1.2% to 1.8%) and 3.1% (95% CI: 2.2 to 7.2%), respectively. Parameter uncertainty does not change the conclusion that immediate and extreme limitations on fishing practice and effort are necessary to increase the chances of recovery for some local populations/stocks. Fishing effort in New Zealand is regulated by a quota system. The quota system, the low number of fishing boats and the relatively low overlap between fishing nets and dolphins are probably the reasons for the positive population growth of Hector�s dolphins from the West Coast of the South Island. On the other hand, not even the Marine Mammal Sanctuary is sufficient to avoid negative mean population growth rate of Hector�s dolphins under current levels of fishing effort off Banks Peninsula. In Brazil, Uruguay and Argentina, where franciscana occurs, gillnet fisheries are not regulated. In some areas, faced with a declining fish stocks, fishermen have increased fishing effort to compensate for reduced catches, and the bycatch of franciscana has increased as a consequence. Strategies aiming at the conservation of these two species are likely to benefit other components of the ecosystem. Especially in the case of franciscana, reducing fishing effort is likely to promote the recovery of depleted fish stocks.
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Books on the topic "La Plata dolphin"

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Anson, August. Marine Biology and Ocean Science. Balaena Books Inc, 1991.

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Anson, August. Marine Biology and Ocean Science. Balaena Books, 1990.

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Book chapters on the topic "La Plata dolphin"

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Warhol, Andy, and Kurt Benirschke. "La Plata River Dolphin." In Vanishing Animals, 16–21. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4684-6333-0_3.

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Conference papers on the topic "La Plata dolphin"

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Watanabe, Yoshiyasu. "Behaviors of a Very Large Floating Structure Supported With Dolphins Under Earthquake Loading." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37160.

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In recent years, tremendous research efforts have been directed toward developing very large floating structures (VLFSs) for the purposes of airports, terminals etc. on the sea to utilize ocean space. There is a VLFS which has a pontoon type structure supported with many dolphins and it is important to investigate sufficiently the behaviors of such VLFSs under earthquake loading, because large reaction forces will be exerted on the dolphins and fenders that connect the dolphins and the floating structure. This paper reports the results of the time history response analyses of a VLFS supported with dolphins with varying the period and velocity of the applied sinusoidal waves as an earthquake loading when gaps between fenders and dolphins are equal to zero. In the analyses, the floating structure supported with dolphins is modeled as a horizontally elastic plate and a rigid plate both supported with springs and dashpots through gap elements.
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Watanabe, Yoshiyasu. "Behaviors of a Very Large Floating Structure Supported With Dolphins Under Earthquake Loading: The Second Report — In Cases of Actual Earthquake Wave and Existence of Gaps Between Fenders and Dolphins." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92065.

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In recent years, tremendous research efforts have been directed toward developing very large floating structures (VLFSs) for the purposes of airports, terminals etc. on the sea to utilize ocean space. There is a VLFS which has a pontoon type structure supported with many dolphins and it is important to investigate sufficiently the behaviors of such VLFS under earthquake loading, because large reaction forces will be exerted on the dolphins and fenders that connect the dolphins and the floating structure. The preceding paper reported the behaviors of the floating structure, fenders and dolphins obtained from the time history response analyses of the structure with varying the period and velocity of the sinusoidal earthquake wave, when the horizontal rigidity of the floating structure was elastic and rigid and when the gaps between the fenders and dolphins were assumed to be zero. This paper reports, succeeding to the preceding paper, the results of the time history response analyses of a VLFS supported with 49 dolphins with varying the period and velocity of the applied actual earthquake wave in both cases where gaps between the fenders and dolphins are equal to zero and non-zero. In the analyses, the floating structure supported with dolphins is modeled as both a horizontally elastic and rigid plate supported with linear springs and dashpots through gap elements.
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Zhang, Luzeng, Dong H. Lee, Juan Yin, and Hee Koo Moon. "The Effect of Axisymmetric Profile on Turbine Blade Platform Heat Transfer Distribution." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94335.

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Flow field near the turbine blade platform is very complex due to the secondary flow motions such as horseshoe vortices, passage vortices and endwall cross flows. It is therefore extremely difficult to predict the platform heat transfer distribution. As the secondary flows are largely affected by platform profile/shape, a number of investigators have studied different platform profiles to minimize aerodynamic loss and heat load. Understanding of the platform heat transfer has become especially critical in recent years, because of firing temperature increase and low NOx combustion requirement, as it is directly related to turbine durability. Three different axisymmetric platform profiles were designed and experimentally studied: flat profile, dolphin nose profile and shark nose profile. All of them were based on the existing engine hardware designs. The measurements were conducted in a high-speed linear cascade, which consisted of five blades and six flow passages. The test platforms were made of FR4 material and painted with Thermo-chromic Liquid Crystal (TLC). The test article was kept in the plenum located under the cascade at the pre-test condition. At the start of each test, the test blade/article was inserted into the cascade rapidly and then two CCD cameras recorded the color changes of the TLC on the platform surface. Engine representative Reynolds numbers were studied from 300,000 to 600,000 and the corresponding inlet Mach numbers were ranged from 0.12 to 0.24. The upstream section of the flat profile platform showed a typical flat plate heat transfer pattern with boundary layer development. The shark-nose and dolphin-nose platforms resulted in lower heat transfer coefficients on the upstream region compared to that for the flat profile, and the peak values moved slightly downstream from the leading edge due to possibly different secondary flow patterns. The heat transfer rate increased with increased Reynolds number for all three platform shapes, while the flat profile showed a higher increase rate. Zone averaged heat transfer distributions in addition to local values were also presented to show the effect of platform profile. In general, the flat profile platform resulted in a higher overall heat transfer rate than that for the other two profile platforms, which suggested that a good design of contoured profile platform could reduce the heat load and aerodynamic loss in gas turbine blade.
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