scholarly journals How to Kill Another Shark: A First Inside Look at a Potential Hunting Strategy of the Galapagos Shark

2018 ◽  
Vol 11 (1) ◽  
pp. 46-51
Author(s):  
Erich K. Ritter ◽  
Alberto Munoz
Keyword(s):  
Behavioral Characteristics ◽  
Reef Shark ◽  
Entire Duration ◽  
Depth Analysis ◽  
Triaenodon Obesus ◽  
Hunting Strategy

Background: Close-up videos of sharks foraging on other live sharks are rare, especially when it comes to footage of the entire duration of an event. Objective: Our goal was to present an in-depth analysis involving a Galapagos shark, Carcharhinus galapagensis, foraging on a whitetip reef shark, Triaenodon obesus. Method: A frame by frame video examination was used to highlight the different aspects of this bout. Results: Several behavioral characteristics, including the somewhat cryptic approach, the extensive shaking once the Galapagos shark had the whitetip reef shark between its jaws, and devouring tail-first, stand out in this event. Conclusion: The entire act appeared very smooth, indicating that this bout, or at least parts thereof, may represent a common hunting strategy for Galapagos sharks.

Parthenogenesis in a whitetip reef shark Triaenodon obesus involves a reduction in ploidy

2014 ◽  
Vol 85 (2) ◽  
pp. 502-508 ◽  
Author(s):  
D. S. Portnoy ◽  
C. M. Hollenbeck ◽  
J. S. Johnston ◽  
H. M. Casman ◽  
J. R. Gold
Keyword(s):  
Reef Shark ◽  
Triaenodon Obesus

Occurrence of the whitetip reef shark Triaenodon obesus at the Kermadec Islands, Southwest Pacific Ocean

2017 ◽  
Vol 44 (4) ◽  
pp. 354-360 ◽  
Author(s):  
C. A. J. Duffy ◽  
N. D. Forrester ◽  
T. K. Gibson ◽  
S. Hathaway
Keyword(s):  
Pacific Ocean ◽  
Reef Shark ◽  
Southwest Pacific ◽  
Triaenodon Obesus

scholarly journals Relationship between the biomass of reef shark and fish in South Morotai Waters, North Maluku, Indonesia

2020 ◽  
Vol 21 (12) ◽  
Author(s):  
JIBRIEL FIRMAN SOFYAN ◽  
AMBARIYANTO AMBARIYANTO ◽  
KEN SUWARTIMAH ◽  
Abdul Hamid A. Toha
Keyword(s):  
Regression Analysis ◽  
Positive Relationship ◽  
Biomass Estimation ◽  
Functional Composition ◽  
Visual Census ◽  
Underwater Visual Census ◽  
Reef Shark ◽  
Triaenodon Obesus ◽  
Reef Sharks ◽  
Carcharhinus Melanopterus

Abstract. Sofyan JF, Ambariyanto A, Suwartimah K, Toha AHA. 2020. Relationship between the biomass of reef shark and fish in South Morotai Waters, North Maluku, Indonesia. Biodiversitas 21: 5605-5613. This study aims to determine the biomass of reef shark and fish in South Morotai Waters in North Maluku, Indonesia. The Audible Stationary Count and Underwater Visual Census method were used to collect the data of reef sharks and fish. Seven and one site locations of coral reef and shark ecosystems were surveyed and, the data were analyzed using regression analysis to obtain a correlation between the variables. The three reef sharks found were Carcharhinus melanopterus, Triaenodon obesus, and Carcharhinus amblyrhynchos. Biomass estimation of reef sharks and fish ranged from 0.59 to 19.97 kg/ha and 30.95 kg/ha to 49.92 kg/ha, consisting of 8 families. In the area of aggregations, both species were found in 7 sites, and the population of reef shark amounted to 86.96 kg/ha and fish was around 55.705 kg/ha, consisting of 9 families. There was a positive relationship between the biomass of reef shark and fish in South Morotai waters, and the index of determination was 0.8043, showing that the biomass of reef shark was influenced by that of fish. These results indicated the importance of biomass in determining the functional composition and diversity of reef shark and fish.

Group courtship, mating behaviour and siphon sac function in the whitetip reef shark, Triaenodon obesus

2004 ◽  
Vol 68 (6) ◽  
pp. 1435-1442 ◽  
Author(s):  
Nicholas M. Whitney ◽  
Harold L. Pratt ◽  
Jeffrey C. Carrier
Keyword(s):  
Mating Behaviour ◽  
Reef Shark ◽  
Triaenodon Obesus

Oceanic dispersal in a sedentary reef shark (Triaenodon obesus): genetic evidence for extensive connectivity without a pelagic larval stage

2011 ◽  
Vol 39 (6) ◽  
pp. 1144-1156 ◽  
Author(s):  
Nicholas M. Whitney ◽  
William D. Robbins ◽  
Jennifer K. Schultz ◽  
Brian W. Bowen ◽  
Kim N. Holland
Keyword(s):  
Larval Stage ◽  
Genetic Evidence ◽  
Reef Shark ◽  
Triaenodon Obesus ◽  
Pelagic Larval Stage

scholarly journals Complete mitochondrial genome of the whitetip reef shark Triaenodon obesus from the British Indian Ocean Territory Marine Protected Area

2020 ◽  
Vol 5 (3) ◽  
pp. 2347-2349
Author(s):  
Shaili Johri ◽  
Taylor K. Chapple ◽  
Robert Schallert ◽  
Elizabeth A. Dinsdale ◽  
Barbara A. Block
Keyword(s):  
Indian Ocean ◽  
Mitochondrial Genome ◽  
Protected Area ◽  
Marine Protected Area ◽  
Complete Mitochondrial Genome ◽  
Reef Shark ◽  
Triaenodon Obesus

TEM/AEM characterization of fine-grained clay minerals in very-low-grade rocks: Evaluation of contamination by empa involving celadonite family minerals

1996 ◽  
Vol 54 ◽  
pp. 694-695
Author(s):  
Gejing Li ◽  
D. R. Peacor ◽  
D. S. Coombs ◽  
Y. Kawachi
Keyword(s):  
Electron Microscopy ◽  
Volcanic Rocks ◽  
Analytical Electron Microscopy ◽  
Metamorphic Rocks ◽  
New Mineral ◽  
Chemical Compositions ◽  
Low Grade ◽  
Fine Grained ◽  
Depth Analysis ◽  
Mineral Aggregates

Recent advances in transmission electron microscopy (TEM) and analytical electron microscopy (AEM) have led to many new insights into the structural and chemical characteristics of very finegrained, optically homogeneous mineral aggregates in sedimentary and very low-grade metamorphic rocks. Chemical compositions obtained by electron microprobe analysis (EMPA) on such materials have been shown by TEM/AEM to result from beam overlap on contaminant phases on a scale below resolution of EMPA, which in turn can lead to errors in interpretation and determination of formation conditions. Here we present an in-depth analysis of the relation between AEM and EMPA data, which leads also to the definition of new mineral phases, and demonstrate the resolution power of AEM relative to EMPA in investigations of very fine-grained mineral aggregates in sedimentary and very low-grade metamorphic rocks.Celadonite, having end-member composition KMgFe3+Si4O10(OH)2, and with minor substitution of Fe2+ for Mg and Al for Fe3+ on octahedral sites, is a fine-grained mica widespread in volcanic rocks and volcaniclastic sediments which have undergone low-temperature alteration in the oceanic crust and in burial metamorphic sequences.

Doping effects on the geometric and electronic structure of tin clusters

2019 ◽  
Vol 21 (44) ◽  
pp. 24478-24488 ◽  
Author(s):  
Martin Gleditzsch ◽  
Marc Jäger ◽  
Lukáš F. Pašteka ◽  
Armin Shayeghi ◽  
Rolf Schäfer
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Density Functional ◽  
Beam Deflection ◽  
Functional Theory ◽  
Doping Effects ◽  
Depth Analysis ◽  
Trajectory Simulations

In depth analysis of doping effects on the geometric and electronic structure of tin clusters via electric beam deflection, numerical trajectory simulations and density functional theory.

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