scholarly journals Growth of the skull of the bottlenose dolphin, Tursiops truncatus, in the Southwest Atlantic Ocean

10.5597/00229 ◽  
2017 ◽  
Vol 11 (1-2) ◽  
pp. 199-211 ◽  
Author(s):  
André Silva Barreto
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Growth Equation ◽  
Growth Layer ◽  
Southwest Atlantic ◽  
Development Patterns ◽  
Skull Measurements ◽  
The One ◽  
Layer Groups ◽  
Mature Size

Defining the age of attainment of physical maturity is important for many studies, including identification of stocks, populations or species. In order to identify the age when the skull of the bottlenose dolphin, Tursiops truncatus, reaches maturity, skulls of fifty-three specimens found stranded along the coasts of southern Brazil, Uruguay and northern Argentina (27o35’S, 48o34’W-36o49’S, 55o19’W) were analyzed. Sixty skull measurements were taken to compare the growth rate of the different functional apparatuses. Age was estimated by counts of growth layer groups in the dentine of decalcified, stained longitudinal sections of teeth. Von Bertalanffy’s equation was applied to assess the growth and determine the age at maturity of each apparatus. Generally the maturation of skull starts at age two and stabilizes at age five, and the age of reaching the mature size varies amongst different characters. The braincase is the most precocious apparatus, while the feeding is the one that last stabilizes. The development patterns observed for the hearing, vision and breathing apparatuses were similar. Statistic analysis revealed significant differences among the ages at maturity, but not for von Bertalanffy’s growth equation parameters for each functional apparatus. For the studied population it is suggested that skulls can be considered mature in animals with more than five years. 

Comparison of local knowledge about the bottlenose dolphin (Tursiops truncatus Montagu, 1821) in the Southwest Atlantic Ocean: New research needed to develop conservation management strategies

2014 ◽  
Vol 98 ◽  
pp. 120-129 ◽  
Author(s):  
Camilah Antunes Zappes ◽  
Carlos Eduardo Novo Gatts ◽  
Liliane Ferreira Lodi ◽  
Paulo César Simões-Lopes ◽  
Paula Laporta ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Local Knowledge ◽  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Conservation Management ◽  
Management Strategies ◽  
Southwest Atlantic ◽  
New Research

scholarly journals First estimate of common bottlenose dolphin (Tursiops truncatus) (Cetacea, Delphinidae) abundance off Uruguayan Atlantic coast

10.5597/00223 ◽  
2017 ◽  
Vol 11 (1-2) ◽  
pp. 144-154 ◽  
Author(s):  
Paula Laporta ◽  
Pedro Fruet ◽  
Eduardo Secchi
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Atlantic Coast ◽  
Coastal Region ◽  
Demographic Stochasticity ◽  
Southwest Atlantic ◽  
Open Population ◽  
Common Bottlenose Dolphin ◽  
Population Size Estimates

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.

scholarly journals Report of the Working Group on the Biology and Ecology of Tursiops truncatus in the Southwest Atlantic Ocean

10.5597/00216 ◽  
2017 ◽  
Vol 11 (1-2) ◽  
pp. 62-70 ◽  
Author(s):  
Paula Laporta ◽  
Pedro Fruet ◽  
Salvatore Siciliano ◽  
Paulo A. Flores ◽  
Julio D. Loureiro
Keyword(s):  
Atlantic Ocean ◽  
Feeding Ecology ◽  
Working Group ◽  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Southwest Atlantic ◽  
Common Bottlenose Dolphin

We review information on the biology and ecology of common bottlenose dolphin (Tursiops truncatus) in the Southwest Atlantic Ocean (SWAO) with emphasis on growth, feeding ecology, epizootics and parasites, predation and pathologies.

Variability of Dentin Deposits in Tursiops truncatus

1980 ◽  
Vol 37 (4) ◽  
pp. 712-716 ◽  
Author(s):  
Clifford A. Hui
Keyword(s):  
Tursiops Truncatus ◽  
Age Determination ◽  
Growth Layer ◽  
Posterior Teeth ◽  
Annual Cycles ◽  
Left And Right ◽  
Layer Groups

Dentin is deposited in approximately annual cycles in Tursiops truncatus for at least the first 11 yr. There were no consistent differences in the dentinal layer count between the left and right sides nor between the mandible and maxilla in the teeth of nine animals studied. The posterior teeth, however, have a greater number of growth layer groups (GLGs). The differences in the number of GLGs among teeth of the same individual increase unpredictably when there are more than about 15 GLGs in the posterior teeth. Only minimal age may be determined using dentinal counts.Key words: age determination, dentin, dolphins, odontocetes, teeth, Tursiops

Bottlenose dolphin (Tursiops truncatus) whistles vary by context

2009 ◽  
Author(s):  
Wendi Fellner ◽  
Heidi E. Harley
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus

Persistent Effects of Begging on Common Bottlenose Dolphin (Tursiops truncatus) Behavior in an Estuarine Population

2016 ◽  
Vol 42 (4) ◽  
pp. 531-541 ◽  
Author(s):  
Rebeccah A. Hazelkorn ◽  
Bruce A. Schulte ◽  
Tara M. Cox
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Common Bottlenose Dolphin

First Leucistic Bottlenose Dolphin (Tursiops truncatus) Sighting Registered in the Gulf of California, Mexico

2019 ◽  
Vol 45 (5) ◽  
pp. 507-512
Author(s):  
Héctor Pérez-Puig ◽  
Gisela Heckel ◽  
Lorayne Meltzer
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Gulf Of California

Anatomical Description of an Infant Bottlenose Dolphin (Tursiops truncatus) Brain from Magnetic Resonance Images

2004 ◽  
Vol 30 (2) ◽  
pp. 315-326 ◽  
Author(s):  
Lori Marino ◽  
Keith Sudheimer ◽  
D. Ann Pabst ◽  
William A. Mclellan ◽  
Saima Arshad ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Magnetic Resonance Images
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