Estimation of the Abundance of the Spinner Dolphin Stenella Longirostris Using Photo Identification Technique in Samadai Reef , Red Sea , Egypt

2015 ◽  
Vol 10 (1) ◽  
pp. 61-73 ◽  
Author(s):  
Ahmed M. Shawky ◽  
Magdy A. Alwany ◽  
Saad Zakaria ◽  
Salah El-Etreby
Keyword(s):  
Red Sea ◽  
Photo Identification ◽  
Stenella Longirostris ◽  
Spinner Dolphin ◽  
Identification Technique

Spinner dolphin (Stenella longirostris) resting habitat in Samadai Reef (Egypt, Red Sea) protected through tourism management

2008 ◽  
Vol 89 (1) ◽  
pp. 211-216 ◽  
Author(s):  
Giuseppe Notarbartolo-di-Sciara ◽  
Mahmoud H. Hanafy ◽  
Moustafa M. Fouda ◽  
Ayman Afifi ◽  
Marina Costa
Keyword(s):  
Red Sea ◽  
Core Habitat ◽  
Tourism Management ◽  
Stenella Longirostris ◽  
Spinner Dolphin ◽  
The Mean ◽  
Red Sea Coast ◽  
Spinner Dolphins ◽  
Governmental Management ◽  
Sea Coast

The daily presence of spinner dolphins,Stenella longirostris, inside a small reef offshore the Red Sea coast of southern Egypt was monitored from January 2004 to January 2006. Observations indicated marked seasonal and daily variations in the use of the reef as a resting and socializing area by the dolphins, consistent during the two years of monitoring. Overall, the mean number of dolphins present in the reef at any day was 39.2 (SD = 39.34, range 0–210), with the lowest presence in February to April and the highest in June. Similar to other populations of this species in other oceans, dolphins entered the reef between daybreak and mid-morning, and started exiting during the afternoon hours. Although calves were seen in all seasons, a sharp peak was observed in June. Monitoring data provided indications relevant to governmental management efforts, which were implemented in 2004 to ensure that the dolphins could continue using the reef for their resting needs while a sustainable, respectful tourist activity is allowed in a designated zone of the reef adjacent to the dolphins' core habitat.

scholarly journals Predictive Modeling of Spinner Dolphin (Stenella longirostris) Resting Habitat in the Main Hawaiian Islands

PLoS ONE ◽  
2012 ◽  
Vol 7 (8) ◽  
pp. e43167 ◽  
Author(s):  
Lesley H. Thorne ◽  
David W. Johnston ◽  
Dean L. Urban ◽  
Julian Tyne ◽  
Lars Bejder ◽  
...  
Keyword(s):  
Predictive Modeling ◽  
Hawaiian Islands ◽  
Stenella Longirostris ◽  
Spinner Dolphin

Intestinal Coccidiosis in a Spinner Dolphin (Stenella longirostris)

2002 ◽  
Vol 88 (3) ◽  
pp. 634
Author(s):  
J. P. Dubey ◽  
J. S. Eggers ◽  
T. P. Lipscomb
Keyword(s):  
Stenella Longirostris ◽  
Spinner Dolphin

scholarly journals Structure and phylogeography of two tropical predators, spinner ( Stenella longirostris ) and pantropical spotted ( S. attenuata ) dolphins, from SNP data

2018 ◽  
Vol 5 (4) ◽  
pp. 171615 ◽  
Author(s):  
Matthew S. Leslie ◽  
Phillip A. Morin
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
Nuclear Dna ◽  
Population Level ◽  
Genetic Connectivity ◽  
Nucleotide Polymorphisms ◽  
Stenella Longirostris ◽  
Spinner Dolphin ◽  
Spinner Dolphins ◽  
Almost All

Little is known about global patterns of genetic connectivity in pelagic dolphins, including how circumtropical pelagic dolphins spread globally following the rapid and recent radiation of the subfamily delphininae. In this study, we tested phylogeographic hypotheses for two circumtropical species, the spinner dolphin ( Stenella longirostris ) and the pantropical spotted dolphin ( Stenella attenuata ), using more than 3000 nuclear DNA single nucleotide polymorphisms (SNPs) in each species. Analyses for population structure indicated significant genetic differentiation between almost all subspecies and populations in both species. Bayesian phylogeographic analyses of spinner dolphins showed deep divergence between Indo-Pacific, Atlantic and eastern tropical Pacific Ocean (ETP) lineages. Despite high morphological variation, our results show very close relationships between endemic ETP spinner subspecies in relation to global diversity. The dwarf spinner dolphin is a monophyletic subspecies nested within a major clade of pantropical spinner dolphins from the Indian and western Pacific Ocean populations. Population-level division among the dwarf spinner dolphins was detected—with the northern Australia population being very different from that in Indonesia. In contrast to spinner dolphins, the major boundary for spotted dolphins is between offshore and coastal habitats in the ETP, supporting the current subspecies-level taxonomy. Comparing these species underscores the different scale at which population structure can arise, even in species that are similar in habitat (i.e. pelagic) and distribution.

Degrees of residence of Guiana dolphins (Sotalia guianensis) in Ilha Grande Bay, south-eastern Brazil: a preliminary assessment

2010 ◽  
Vol 90 (8) ◽  
pp. 1633-1639 ◽  
Author(s):  
Mariana de A. Espécie ◽  
Rodrigo H.O. Tardin ◽  
Sheila M. Simão
Keyword(s):  
Resource Availability ◽  
Southern Brazil ◽  
Preliminary Assessment ◽  
Photo Identification ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Low Degree ◽  
Identification Technique ◽  
Over Time

The Guiana dolphin, Sotalia guianensis, is a small delphinid found in coastal areas from northern Honduras to southern Brazil. Little is known about the ecology of this species in several areas of its geographical distribution. In this paper, we present new data about the residency of Guiana dolphins in Ilha Grande Bay, south-eastern Brazil. Boat surveys were conducted at the study area from May 2007 to March 2008. Applying the photo-identification technique, we took pictures of dolphins' dorsal fins, looking for natural markings on them. A total of 17,969 photographs were taken, from which was created a databank of 462 distinct dolphins. Individuals showed different degrees of residency in the bay. More than 50% of the catalogued dolphins were considered non-residents and/or showed a low degree of residence. The average interval between resightings was 35 ± 27.4 days. Animals without markings (calves and juveniles) accounted for 45% (N = 2917) of photographs taken. These results indicate that this population has a fluid structure including different individuals over time. We suggest a possible relationship between the presence of some individuals and local resource availability, such as prey and protected areas.

Broadband characteristics of spinner dolphin (Stenella longirostris) social acoustic signals

1997 ◽  
Vol 102 (5) ◽  
pp. 3122-3122 ◽  
Author(s):  
Marc O. Lammers ◽  
Whitlow W. L. Au ◽  
Roland Aubauer
Keyword(s):  
Acoustic Signals ◽  
Stenella Longirostris ◽  
Spinner Dolphin
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