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https://www.readbyqxmd.com/read/29900072/does-bathymetry-drive-coastal-whale-shark-rhincodon-typus-aggregations
#1
Joshua P Copping, Bryce D Stewart, Colin J McClean, James Hancock, Richard Rees
Background: The whale shark ( Rhincodon typus ) is known to aggregate in a number of coastal locations globally, however what causes these aggregations to form where they do is largely unknown. This study examines whether bathymetry is an important driver of coastal aggregation locations for R. typus through bathymetry's effect on primary productivity and prey availability. This is a global study taking into account all coastal areas within R. typus' range. Methods: R...
2018: PeerJ
https://www.readbyqxmd.com/read/29728679/whale-shark-makes-record-setting-swim
#2
(no author information available yet)
No abstract text is available yet for this article.
May 2018: Nature
https://www.readbyqxmd.com/read/29684074/correction-association-of-whale-sharks-rhincodon-typus-with-thermo-biological-frontal-systems-of-the-eastern-tropical-pacific
#3
John P Ryan, Jonathan R Green, Eduardo Espinoza, Alex R Hearn
[This corrects the article DOI: 10.1371/journal.pone.0182599.].
2018: PloS One
https://www.readbyqxmd.com/read/29523545/microbiome-dynamics-in-a-large-artificial-seawater-aquarium
#4
Nastassia V Patin, Zoe A Pratte, Matthew Regensburger, Eric Hall, Kailen Gilde, Alistair D M Dove, Frank J Stewart
Artificial habitats for animals have high commercial and societal value. Microbial communities (microbiomes) in such habitats may play ecological roles similar to those in nature. However, this hypothesis remains largely untested. Georgia Aquarium's Ocean Voyager (OV) exhibit is a closed-system aquatic habitat that mimics the oligotrophic open ocean and houses thousands of large marine animals, including fish, sea turtles, and whale sharks. We present a 14-month time series characterizing the OV water column microbiome...
May 15, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29426206/first-results-on-zooplankton-community-composition-and-contamination-by-some-persistent-organic-pollutants-in-the-gulf-of-tadjoura-djibouti
#5
G Boldrocchi, Y Moussa Omar, D Rowat, R Bettinetti
The Gulf of Tadjoura is located in the Horn of Africa and is widely recognized as an important site where the zooplanktivorous whale sharks seasonally aggregate from October to February. The surface zooplankton community (0-3m) was weekly sampled from November 2016 to February 2017 in two sites during the whale shark aggregation period. A total of 12 phyla were identified. Copepoda represented the most abundant and diverse group with 29 different genera, and contributed with an average of 82% of the mean zooplankton density of approximately 6600indm-3 ...
June 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29422348/microplastics-no-small-problem-for-filter-feeding-megafauna
#6
Elitza S Germanov, Andrea D Marshall, Lars Bejder, Maria Cristina Fossi, Neil R Loneragan
Microplastic pollution can impact filter-feeding marine megafauna, namely mobulid rays, filter-feeding sharks, and baleen whales. Emerging research on these flagship species highlights potential exposure to microplastic contamination and plastic-associated toxins. Research and its wide communication are needed to understand the magnitude of the issue and improve marine stewardship.
April 2018: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/29312815/satellite-tagging-highlights-the-importance-of-productive-mozambican-coastal-waters-to-the-ecology-and-conservation-of-whale-sharks
#7
Christoph A Rohner, Anthony J Richardson, Fabrice R A Jaine, Michael B Bennett, Scarla J Weeks, Geremy Cliff, David P Robinson, Katie E Reeve-Arnold, Simon J Pierce
The whale shark Rhincodon typus is an endangered, highly migratory species with a wide, albeit patchy, distribution through tropical oceans. Ten aerial survey flights along the southern Mozambican coast, conducted between 2004-2008, documented a relatively high density of whale sharks along a 200 km stretch of the Inhambane Province, with a pronounced hotspot adjacent to Praia do Tofo. To examine the residency and movement of whale sharks in coastal areas around Praia do Tofo, where they may be more susceptible to gill net entanglement, we tagged 15 juveniles with SPOT5 satellite tags and tracked them for 2-88 days (mean = 27 days) as they dispersed from this area...
2018: PeerJ
https://www.readbyqxmd.com/read/29023767/do-they-stay-or-do-they-go-acoustic-monitoring-of-whale-sharks-at-ningaloo-marine-park-western-australia
#8
B M Norman, J M Whitty, S J Beatty, S D Reynolds, D L Morgan
Whale sharks Rhincodon typus were monitored via acoustic transmitters at the northern end of Western Australia's Ningaloo Marine Park to establish the extent to which the species inhabits the region beyond the whale-shark ecotourism industry season, which usually extends from March to August in each year. Despite the vast majority (c. 98%) of photographic submissions of R. typus from Ningaloo Reef being between March and August, acoustic detections from the tagged R. typus at Ningaloo were recorded in all months of the year, but do not preclude the occurrence of extended absences...
October 10, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28989750/feeding-the-world-s-largest-fish-highly-variable-whale-shark-residency-patterns-at-a-provisioning-site-in-the-philippines
#9
Jordan A Thomson, Gonzalo Araujo, Jessica Labaja, Emer McCoy, Ryan Murray, Alessandro Ponzo
Provisioning wildlife for tourism is a controversial yet widespread practice. We analysed the residency patterns of juvenile whale sharks (Rhincodon typus) in Oslob, Philippines, where provisioning has facilitated a large shark-watching operation since 2011. We identified 208 individual sharks over three years, with an average of 18.6 (s.d. = 7.8, range = 6-43) individuals sighted per week. Weekly shark abundance varied seasonally and peak-season abundance (approx. May-November) increased across years...
September 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28946861/erratum-to-draft-sequencing-and-assembly-of-the-genome-of-the-world-s-largest-fish-the-whale-shark-rhincodon-typus-smith-1828
#10
Timothy D Read, Robert A Petit, Sandeep J Joseph, Tauqeer Alam, M Ryan Weil, Maida Ahmad, Ravila Bhimani, Jocelyn S Vuong, Chad P Haase, D Harry Webb, Milton Tan, Alistair D M Dove
No abstract text is available yet for this article.
September 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28934371/some-like-it-hot-repeat-migration-and-residency-of-whale-sharks-within-an-extreme-natural-environment
#11
David P Robinson, Mohammed Y Jaidah, Steffen S Bach, Christoph A Rohner, Rima W Jabado, Rupert Ormond, Simon J Pierce
The Arabian Gulf is the warmest sea in the world and is host to a globally significant population of the whale shark Rhincodon typus. To investigate regional whale shark behaviour and movements, 59 satellite-linked tags were deployed on whale sharks in the Al Shaheen area off Qatar from 2011-14. Four different models of tag were used throughout the study, each model able to collect differing data or quantities of data. Retention varied from one to 227 days. While all tagged sharks crossed international maritime boundaries, they typically stayed within the Arabian Gulf...
2017: PloS One
https://www.readbyqxmd.com/read/28882212/diet-composition-and-trophic-ecology-of-northeast-pacific-ocean-sharks
#12
REVIEW
Joseph J Bizzarro, Aaron B Carlisle, Wade D Smith, Enric Cortés
Although there is a general perception of sharks as large pelagic, apex predators, most sharks are smaller, meso- and upper-trophic level predators that are associated with the seafloor. Among 73 shark species documented in the eastern North Pacific (ENP), less than half reach maximum lengths >200cm, and 78% occur in demersal or benthic regions of the continental shelf or slope. Most small (≤200cm) species (e.g., houndsharks) and demersal, nearshore juveniles of larger species (e.g., requiem sharks) consume small teleosts and decapod crustaceans, whereas large species in pelagic coastal and oceanic environments feed on large teleosts and squids...
2017: Advances in Marine Biology
https://www.readbyqxmd.com/read/28854201/association-of-whale-sharks-rhincodon-typus-with-thermo-biological-frontal-systems-of-the-eastern-tropical-pacific
#13
John P Ryan, Jonathan R Green, Eduardo Espinoza, Alex R Hearn
Satellite tracking of 27 whale sharks in the eastern tropical Pacific, examined in relation to environmental data, indicates preferential occupancy of thermo-biological frontal systems. In these systems, thermal gradients are caused by wind-forced circulation and mixing, and biological gradients are caused by associated nutrient enrichment and enhanced primary productivity. Two of the frontal systems result from upwelling, driven by divergence in the current systems along the equator and the west coast of South America; the third results from wind jet dynamics off Central America...
2017: PloS One
https://www.readbyqxmd.com/read/28842669/dna-analysis-of-traded-shark-fins-and-mobulid-gill-plates-reveals-a-high-proportion-of-species-of-conservation-concern
#14
Dirk Steinke, Andrea M Bernard, Rebekah L Horn, Paul Hilton, Robert Hanner, Mahmood S Shivji
Continuously increasing demand for plant and animal products causes unsustainable depletion of biological resources. It is estimated that one-quarter of sharks and rays are threatened worldwide and although the global fin trade is widely recognized as a major driver, demand for meat, liver oil, and gill plates also represents a significant threat. This study used DNA barcoding and 16 S rRNA sequencing as a method to identify shark and ray species from dried fins and gill plates, obtained in Canada, China, and Sri Lanka...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817569/long-term-assessment-of-whale-shark-population-demography-and-connectivity-using-photo-identification-in-the-western-atlantic-ocean
#15
Jennifer A McKinney, Eric R Hoffmayer, Jason Holmberg, Rachel T Graham, William B Driggers, Rafael de la Parra-Venegas, Beatriz E Galván-Pastoriza, Steve Fox, Simon J Pierce, Alistair D M Dove
The predictable occurrence of whale sharks, Rhincodon typus, has been well documented in several areas. However, information relating to their migratory patterns, residency times and connectivity across broad spatial scales is limited. In the present study photo-identification data is used to describe whale shark population structure and connectivity among known aggregation sites within the Western Central Atlantic Ocean (WCA). From 1999 to 2015, 1,361 individuals were identified from four distinct areas: the Yucatan Peninsula, Mexico (n = 1,115); Honduras (n = 146); northern Gulf of Mexico, United States (n = 112), and Belize (n = 49)...
2017: PloS One
https://www.readbyqxmd.com/read/28812572/population-characteristics-of-a-large-whale-shark-aggregation-inferred-from-seawater-environmental-dna
#16
Eva Egelyng Sigsgaard, Ida Broman Nielsen, Steffen Sanvig Bach, Eline D Lorenzen, David Philip Robinson, Steen Wilhelm Knudsen, Mikkel Winther Pedersen, Mohammed Al Jaidah, Ludovic Orlando, Eske Willerslev, Peter Rask Møller, Philip Francis Thomsen
Population genetics is essential for understanding and managing marine ecosystems, but sampling remains challenging. We demonstrate that high-throughput sequencing of seawater environmental DNA can provide useful estimates of genetic diversity in a whale shark (Rhincodon typus) aggregation. We recover similar mitochondrial haplotype frequencies in seawater compared to tissue samples, reliably placing the studied aggregation in a global genetic context and expanding the applications of environmental DNA to encompass population genetics of aquatic organisms...
November 21, 2016: Nature Ecology & Evolution
https://www.readbyqxmd.com/read/28795217/animals-living-in-polluted-environments-are-a-potential-source-of-anti-tumor-molecule-s
#17
REVIEW
Shareni Jeyamogan, Naveed Ahmed Khan, Ruqaiyyah Siddiqui
Despite advances in therapeutic interventions and supportive care, the morbidity and mortality associated with cancer have remained significant. Thus, there is a need for newer and more powerful anti-tumor agents. The search for new anti-tumor compounds originating from natural resources is a promising research area. Animals living in polluted environments are a potent source of anti-tumor agents. Under polluted milieus, species such as crocodiles, feed on rotten meat, are exposed to heavy metals, endure high levels of radiation, and are among the very few species to survive the catastrophic Cretaceous-Tertiary extinction event with a prolonged lifespan...
November 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28709399/draft-sequencing-and-assembly-of-the-genome-of-the-world-s-largest-fish-the-whale-shark-rhincodon-typus-smith-1828
#18
Timothy D Read, Robert A Petit, Sandeep J Joseph, Md Tauqeer Alam, M Ryan Weil, Maida Ahmad, Ravila Bhimani, Jocelyn S Vuong, Chad P Haase, D Harry Webb, Milton Tan, Alistair D M Dove
BACKGROUND: The whale shark (Rhincodon typus) has by far the largest body size of any elasmobranch (shark or ray) species. Therefore, it is also the largest extant species of the paraphyletic assemblage commonly referred to as fishes. As both a phenotypic extreme and a member of the group Chondrichthyes - the sister group to the remaining gnathostomes, which includes all tetrapods and therefore also humans - its genome is of substantial comparative interest. Whale sharks are also listed as an endangered species on the International Union for Conservation of Nature's Red List of threatened species and are of growing popularity as both a target of ecotourism and as a charismatic conservation ambassador for the pelagic ecosystem...
July 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28484673/oceanic-adults-coastal-juveniles-tracking-the-habitat-use-of-whale-sharks-off-the-pacific-coast-of-mexico
#19
Dení Ramírez-Macías, Nuno Queiroz, Simon J Pierce, Nicolas E Humphries, David W Sims, Juerg M Brunnschweiler
Eight whale sharks tagged with pop-up satellite archival tags off the Gulf of California, Mexico, were tracked for periods of 14-134 days. Five of these sharks were adults, with four females visually assessed to be pregnant. At least for the periods they were tracked, juveniles remained in the Gulf of California while adults moved offshore into the eastern Pacific Ocean. We propose that parturition occurs in these offshore waters. Excluding two juveniles that remained in the shallow tagging area for the duration of tracking, all sharks spent 65 ± 20...
2017: PeerJ
https://www.readbyqxmd.com/read/28274762/are-whale-sharks-exposed-to-persistent-organic-pollutants-and-plastic-pollution-in-the-gulf-of-california-mexico-first-ecotoxicological-investigation-using-skin-biopsies
#20
Maria Cristina Fossi, Matteo Baini, Cristina Panti, Matteo Galli, Begoña Jiménez, Juan Muñoz-Arnanz, Letizia Marsili, Maria Grazia Finoia, Dení Ramírez-Macías
The whale shark (Rhincodon typus) is an endangered species that may be exposed to micro- and macro-plastic ingestion as a result of their filter-feeding activity, particularly on the sea surface. In this pilot project we perform the first ecotoxicological investigation on whale sharks sampled in the Gulf of California exploring the potential interaction of this species with plastic debris (macro-, micro-plastics and related sorbed contaminants). Due to the difficulty in obtaining stranded specimens of this endangered species, an indirect approach, by skin biopsies was used for the evaluation of the whale shark ecotoxicological status...
September 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
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