scholarly journals Population structure and residency patterns of whale sharks,Rhincodon typus, at a provisioning site in Cebu, Philippines

PeerJ ◽  
2014 ◽  
Vol 2 ◽  
pp. e543 ◽  
Author(s):  
Gonzalo Araujo ◽  
Anna Lucey ◽  
Jessica Labaja ◽  
Catherine Lee So ◽  
Sally Snow ◽  
...  
Keyword(s):  
Population Structure ◽  
Rhincodon Typus ◽  
Whale Sharks

scholarly journals Describing the population structure of Rhincodon typus occurring in the waters of Oslob– Cebu, Philippines– between March 2012 and June 2013, during the provisioning interaction hours.

2013 ◽  
Author(s):  
Gonzalo Araujo ◽  
Alessandro Ponzo ◽  
Daniel Geary ◽  
Samantha Craven ◽  
Sally J Snow ◽  
...  
Keyword(s):  
Population Structure ◽  
The Philippines ◽  
First Year ◽  
Systematic Data ◽  
Rhincodon Typus ◽  
Non Invasive ◽  
Monthly Average ◽  
Whale Sharks ◽  
The Impact ◽  
Systematic Data Collection

Background: Prior to this study, the aggregation of whale sharks in the waters of Oslob had never been described. Provisioning (Orams, 2002) activities started in late 2011, and systematic data collection in March 2012, attracting over 100,000 tourists in the first year, and is currently the most reliable aggregation of R. typus in the Philippines. Methods: Daily in-­‐water photographic identification was used as a non-­‐invasive means to describe the population throughout the study period. A total of 135 sharks were identified, and IDs were independently matched by three researchers to minimize error. Photogrammetry (Rohner, 2011) was adopted to complement population description. Results: Daily sightings ranged from 2 to 23 different animals in the interaction area (mean=11.14). A total of 109 males, 15 females and 11 R. typus of undetermined sex were described. The size was estimated for 73.3% of the population, with an average of 5.36m ±1.3m. Photogrammetry posed a mean of 5.63m ±0.59m on 14 sharks, 6.75% >than researchers’ estimates. Resighting (>1d) was observed in 66.7% of the population. Five individuals were present for >300d (n=443) in the interaction area, with a maximum of 420d. Nine individuals were successfully matched across regional hotspots including Donsol and Southern Leyte. Conclusion: Despite the presence of animals in Oslob year round and the influence of the provisioning, there appears to be a seasonal influx of animals, with a maximum of 46 different animals present in the month of June 2012 and again in May 2013, contrasting with a monthly average of 28.9. It appears these waters are important to the species and it’s paramount to fully investigate the impact of the provisioning on the population of R. typus in the Philippines.

scholarly journals Describing the population structure of Rhincodon typus occurring in the waters of Oslob– Cebu, Philippines– between March 2012 and June 2013, during the provisioning interaction hours.

2013 ◽  
Author(s):  
Gonzalo Araujo ◽  
Alessandro Ponzo ◽  
Daniel Geary ◽  
Samantha Craven ◽  
Sally J Snow ◽  
...  
Keyword(s):  
Population Structure ◽  
The Philippines ◽  
First Year ◽  
Systematic Data ◽  
Rhincodon Typus ◽  
Non Invasive ◽  
Monthly Average ◽  
Whale Sharks ◽  
The Impact ◽  
Systematic Data Collection

Background: Prior to this study, the aggregation of whale sharks in the waters of Oslob had never been described. Provisioning (Orams, 2002) activities started in late 2011, and systematic data collection in March 2012, attracting over 100,000 tourists in the first year, and is currently the most reliable aggregation of R. typus in the Philippines. Methods: Daily in-­‐water photographic identification was used as a non-­‐invasive means to describe the population throughout the study period. A total of 135 sharks were identified, and IDs were independently matched by three researchers to minimize error. Photogrammetry (Rohner, 2011) was adopted to complement population description. Results: Daily sightings ranged from 2 to 23 different animals in the interaction area (mean=11.14). A total of 109 males, 15 females and 11 R. typus of undetermined sex were described. The size was estimated for 73.3% of the population, with an average of 5.36m ±1.3m. Photogrammetry posed a mean of 5.63m ±0.59m on 14 sharks, 6.75% >than researchers’ estimates. Resighting (>1d) was observed in 66.7% of the population. Five individuals were present for >300d (n=443) in the interaction area, with a maximum of 420d. Nine individuals were successfully matched across regional hotspots including Donsol and Southern Leyte. Conclusion: Despite the presence of animals in Oslob year round and the influence of the provisioning, there appears to be a seasonal influx of animals, with a maximum of 46 different animals present in the month of June 2012 and again in May 2013, contrasting with a monthly average of 28.9. It appears these waters are important to the species and it’s paramount to fully investigate the impact of the provisioning on the population of R. typus in the Philippines.

Population structure and residency of whale sharks Rhincodon typus at Utila, Bay Islands, Honduras

2013 ◽  
Vol 83 (3) ◽  
pp. 574-587 ◽  
Author(s):  
S. Fox ◽  
I. Foisy ◽  
R. De La Parra Venegas ◽  
B. E. Galván Pastoriza ◽  
R. T. Graham ◽  
...  
Keyword(s):  
Population Structure ◽  
Rhincodon Typus ◽  
Whale Sharks ◽  
Bay Islands

scholarly journals Regional movements of satellite‐tagged whale sharks Rhincodon typus in the Gulf of Aden

2021 ◽  
Author(s):  
Samantha Andrzejaczek ◽  
Michel Vély ◽  
Daniel Jouannet ◽  
David Rowat ◽  
Sabrina Fossette
Keyword(s):  
Gulf Of Aden ◽  
Rhincodon Typus ◽  
Whale Sharks

scholarly journals Diet of whale sharks Rhincodon typus inferred from stomach content and signature fatty acid analyses

2013 ◽  
Vol 493 ◽  
pp. 219-235 ◽  
Author(s):  
CA Rohner ◽  
LIE Couturier ◽  
AJ Richardson ◽  
SJ Pierce ◽  
CEM Prebble ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Stomach Content ◽  
Rhincodon Typus ◽  
Whale Sharks

scholarly journals Spatial and temporal patterns of nature-based tourism interactions with whale sharks (Rhincodon typus) at Ningaloo Reef, Western Australia

2014 ◽  
Vol 148 ◽  
pp. 109-119 ◽  
Author(s):  
Douglas J. Anderson ◽  
Halina T. Kobryn ◽  
Brad M. Norman ◽  
Lars Bejder ◽  
Julian A. Tyne ◽  
...  
Keyword(s):  
Western Australia ◽  
Temporal Patterns ◽  
Spatial And Temporal Patterns ◽  
Rhincodon Typus ◽  
Ningaloo Reef ◽  
Whale Sharks

scholarly journals Sizing and scarring of whale shark (Rhincodon typus Smith, 1828) in the Cenderawasih Bay National Park

2021 ◽  
Vol 21 (3) ◽  
pp. 199-213
Author(s):  
Yusup A Jentewo ◽  
Roni Bawole ◽  
Tresia S Tururaja ◽  
Mudjirahayu Mudjirahayu ◽  
Zeth Parinding ◽  
...  
Keyword(s):  
National Park ◽  
The Body ◽  
Whale Shark ◽  
Gill Slit ◽  
Rhincodon Typus ◽  
Photo Identification ◽  
Dorsal Fin ◽  
Total Length ◽  
Whale Sharks ◽  
Photo Collection

This study aims to determine the total length and scar condition of the body of whale sharks (Rhincodon typus) in Cendrawasih Bay National Park (TNTC), Papua-Indonesia. Photo-identification was used to identify individuals of the whale shark R. typus based on spot patterns behind the last gill slit of each individual. Photo-identification was also used to determine the scar of the whale shark. The total length of whale sharks were estimated based on the length of a snorkeller (assumed to be 1.6 m) swimming alongside the whale shark. We identified 21 individuals of R. typus. Of these 21 individuals, 14 were new sightings and seven were re-sightings that have been recorded in the previous photo collection database. R. typus ranged in size from 2 to 5 m total length (average 3.78 m, ±0,86, N= 21). Based on their size, all individuals of whale shark were categorized as juvenile. 52% of R. typus identified had scars and 38 % were not and 10% were unknown. The majority of whale sharks had amputation (12 individuals) and abrasion (7 individuals) scars. Scars occurred most often on the caudal fin and dorsal fin, five and four individuals respectively. This information is useful for understanding potential threats and designing better management programmes for R. typus conservation in TNTC.

Evidence of continued hunting of whale sharks Rhincodon typus in the Maldives

2009 ◽  
Vol 86 (3) ◽  
pp. 371-374 ◽  
Author(s):  
Morgan J. Riley ◽  
Adam Harman ◽  
Richard G. Rees
Keyword(s):  
Rhincodon Typus ◽  
Whale Sharks
Sign in / Sign up

Export Citation Format

Share Document