Diel movement patterns of the scalloped hammerhead shark (Sphyrna lewini) in relation to El Bajo Espiritu Santo: a refuging central-position social system

1984 ◽  
Vol 15 (1) ◽  
pp. 45-54 ◽  
Author(s):  
A. Peter Klimley ◽  
Donald R. Nelson
Keyword(s):  
Social System ◽  
Movement Patterns ◽  
Central Position ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Diel Movement

Residency and diel movement patterns of the endangered scalloped hammerhead Sphyrna lewini in the Revillagigedo National Park

2020 ◽  
Vol 96 (2) ◽  
pp. 543-548 ◽  
Author(s):  
Alejandro Aldana‐Moreno ◽  
E. Mauricio Hoyos‐Padilla ◽  
Rogelio González‐Armas ◽  
Felipe Galván‐Magaña ◽  
Alex Hearn ◽  
...  
Keyword(s):  
National Park ◽  
Movement Patterns ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
Diel Movement

Global phylogeography of the scalloped hammerhead shark ( Sphyrna lewini )

2006 ◽  
Vol 15 (8) ◽  
pp. 2239-2251 ◽  
Author(s):  
K. M. DUNCAN ◽  
A. P. MARTIN ◽  
B. W. BOWEN ◽  
H. G. DE COUET
Keyword(s):  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead

New microsatellite loci for the endangered scalloped hammerhead shark,Sphyrna lewini

2009 ◽  
Vol 9 (3) ◽  
pp. 955-957 ◽  
Author(s):  
HOLLY A. NANCE ◽  
TOBY S. DALY-ENGEL ◽  
PETER B. MARKO
Keyword(s):  
Microsatellite Loci ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead

Residency of the scalloped hammerhead shark (Sphyrna lewini) at Malpelo Island and evidence of migration to other islands in the Eastern Tropical Pacific

2011 ◽  
Vol 91 (2) ◽  
pp. 165-176 ◽  
Author(s):  
Sandra Bessudo ◽  
German Andres Soler ◽  
A. Peter Klimley ◽  
James T. Ketchum ◽  
Alex Hearn ◽  
...  
Keyword(s):  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Malpelo Island

scholarly journals VERTICAL AND HORIZONTAL MOVEMENTS OF THE SCALLOPED HAMMERHEAD SHARK (SPHYRNA LEWINI) AROUND MALPELO AND COCOS ISLANDS (TROPICAL EASTERN PACIFIC) USING SATELLITE TELEMETRY

2016 ◽  
Vol 40 ◽  
Author(s):  
Sandra Bessudo ◽  
Germán A. Soler ◽  
Peter A. Klimley ◽  
James Ketchum ◽  
Randall Arauz ◽  
...  
Keyword(s):  
Satellite Telemetry ◽  
Movement Patterns ◽  
Eastern Pacific ◽  
Depth Range ◽  
Tropical Eastern Pacific ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
Distribution Ranges ◽  
Cocos Island ◽  
Hammerhead Sharks

Understanding distribution ranges and the daily movement patterns of pelagic fishes are key aspects for the establishment and planning of protected areas for their conservation. In this study the vertical and horizontal movements of scalloped hammerhead sharks, Sphyrna lewini, were recorded in Malpelo and Cocos Island using satellite telemetry. Nine sharks were tagged with satellite transmitters during March 2006, 2007 and 2008 at Malpelo Island, and three hammerhead sharks were tagged at Cocos Island in June 2008. The sharks moved between islands in the Tropical Eastern Pacific and made regional movements from Malpelo to the south of Cocos and around the Malpelo ridge. When away from the island, sharks made infrequent nocturnal short dives down to 1000 m where temperatures were as low as 4 °C. For a shark that was tracked for five months, results indicated significant differences between the time spent at different depth ranges, as well as an interaction between depth, water layers, and the time of the day. The shark swam mostly at surface waters (0-10 m) during the cold water season, and spent more time at the deepest depth range (>100 m) during nigh time. Further long-term studies on shark movement patterns are required for a better management of this highly mobile and vulnerable species.

scholarly journals Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil

2009 ◽  
Vol 57 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Teodoro Vaske Júnior ◽  
Carolus Maria Vooren ◽  
Rosangela Paula Lessa
Keyword(s):  
Food Web ◽  
Deep Water ◽  
Feeding Strategy ◽  
Northeastern Brazil ◽  
Sphyrna Lewini ◽  
Marine Food Web ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Marine Food

A total of 425 stomachs of night shark (Carcharhinus signatus), and 98 stomachs of scalloped hammerhead shark (Sphyrna lewini), from longline and surface gillneters near seamounts off northeastern Brazil, were analysed between 1992 and 1999. Both predators prey upon reef and benthopelagic fishes, migrant cephalopods and deep water crustaceans, showing similar feeding niches (Schoener Index T=0.75). The great prey richness of the diets may reflect the fact that the marine food web for these species is very extensive in this region. Due to the concentration for feeding of both predators in the seamounts, intense fisheries should be monitored to avoid localised depletions.

scholarly journals Age and growth of the Scalloped Hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834), from the southern Brazilian coast

2011 ◽  
Vol 71 (3) ◽  
pp. 755-761 ◽  
Author(s):  
JE. Kotas ◽  
V. Mastrochirico ◽  
M. Petrere Junior
Keyword(s):  
Growth Parameters ◽  
Growth Models ◽  
Calculated Data ◽  
Age And Growth ◽  
Brazilian Coast ◽  
Sphyrna Lewini ◽  
Hammerhead Shark ◽  
Scalloped Hammerhead ◽  
Marginal Increment ◽  
Best Fit

Age and growth studies for the scalloped hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834) caught along the southern Brazilian coast, were based on ring measurements of vertebrae sections of 115 males, 116 females and 14 unknown sexed sharks between 48 and 344 cm total length (TL). The von Bertalanffy growth models were best fit using back-calculated data. The growth parameters obtained for males, were L∞ = 266 cm; K = 0.05/year; L0 = 47 cm. For females, L∞ = 300 cm; K = 0.05/year; L0 = 51 cm. An adult female reached 217 cm TL and was 31.5 years old. On the other hand, an adult male was 29.5 years old and measured 234 cm TL. Longevity estimate for males and females was 55 years. Therefore, S. lewini is a long-lived fish. Ageing precision, based on the IAPE index, was 5.6%. Marginal Increment analysis based on MIR index from hammerheads smaller than 105 cm, compared with the percentual of opaque and hyaline bands found per month ageing whole vertebrae, showed an annual ring formation, i.e., in winter.

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