Use of Photo Identi¢cation to Describe a White Shark Aggregation at Guadalupe Island, Mexico

2012 ◽  
pp. 406-417 ◽  
Keyword(s):  
White Shark ◽  
Guadalupe Island

Unraveling the white shark observation tourism at Guadalupe Island, Mexico: Actors, needs and sustainability

Marine Policy ◽  
2020 ◽  
Vol 119 ◽  
pp. 104056 ◽  
Author(s):  
Mercedes I. Meza-Arce ◽  
Luis Malpica-Cruz ◽  
Mauricio E. Hoyos-Padilla ◽  
Francisco J. Mojica ◽  
María Concepción Arredondo-García ◽  
...  
Keyword(s):  
White Shark ◽  
Guadalupe Island

Statistical modelling reveals spatial, temporal, and environmental preferences for white sharks at an oceanic aggregation site

2020 ◽  
Vol 655 ◽  
pp. 171-183
Author(s):  
EE Becerril-García ◽  
RO Martínez-Rincón ◽  
F Galván-Magaña ◽  
O Santana-Morales ◽  
EM Hoyos-Padilla
Keyword(s):  
Feeding Habits ◽  
Generalized Additive Models ◽  
Statistical Modelling ◽  
Time Of Day ◽  
White Shark ◽  
Additive Models ◽  
Environmental Preferences ◽  
Data Set ◽  
Aggregation Site ◽  
Guadalupe Island

Guadalupe Island, Mexico, is one of the most important white shark (Carcharodon carcharias) aggregation sites in the Eastern Pacific. In the waters surrounding Guadalupe Island, cage diving has been carried out since 2001 during August-November; however, there is scarce information regarding the factors associated with this seasonal aggregation. The purpose of this study was to describe the probability of occurrence of white sharks relative to spatial, temporal, and environmental factors in Guadalupe Island. Generalized additive models (GAMs) were used to describe the effect of sea surface temperature, water visibility, tide, moon phase, cloud cover, time of day, and location on white shark occurrence. GAMs were generated from a data set of 6266 sightings of white sharks, classified as immature males, mature males, immature females, and mature females. A sexual segregation related to month was observed, where females arrived after males during late September. GAMs evidenced a segregation of white sharks according to the analysed variables, which is consistent with previous observations in this locality. Environmental preferences for each white shark category are potentially influenced by feeding habits, sexual maturation, and reproduction. This study constitutes a baseline of the effect of the environment on the occurrence of white sharks in Guadalupe Island, which can be used in further studies regarding management and conservation in future climatic and anthropogenic scenarios. Its relevance is related to the understanding of its ecology in oceanic environments and the presence of this threatened species during the ecotourism season.

How much is too much? A carrying capacity study of white shark cage diving in Guadalupe Island, Mexico

Marine Policy ◽  
2021 ◽  
Vol 131 ◽  
pp. 104588
Author(s):  
Omar Santana-Morales ◽  
E. Mauricio Hoyos-Padilla ◽  
Alfonso Medellín-Ortíz ◽  
Chugey Sepulveda ◽  
Rodrigo Beas-Luna ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
White Shark ◽  
Guadalupe Island

An exploration of the population characteristics and behaviours of the white shark in Guadalupe Island, Mexico (2014–2019): Observational data from cage diving vessels

2021 ◽  
Author(s):  
Omar Santana‐Morales ◽  
Rebeca Zertuche‐Chanes ◽  
Edgar M. Hoyos‐Padilla ◽  
Chugey Sepúlveda ◽  
Edgar E. Becerril‐García ◽  
...  
Keyword(s):  
Observational Data ◽  
White Shark ◽  
Population Characteristics ◽  
Guadalupe Island

scholarly journals Diving deeper into the underlying white shark behaviors at Guadalupe Island, Mexico

2021 ◽  
Author(s):  
Marc Aquino‐Baleytó ◽  
Vianey Leos‐Barajas ◽  
Timo Adam ◽  
Mauricio Hoyos‐Padilla ◽  
Omar Santana‐Morales ◽  
...  
Keyword(s):  
White Shark ◽  
Guadalupe Island

scholarly journals A first estimate of white shark, Carcharodon carcharias , abundance off Central California

2011 ◽  
Vol 7 (4) ◽  
pp. 581-583 ◽  
Author(s):  
Taylor K. Chapple ◽  
Salvador J. Jorgensen ◽  
Scot D. Anderson ◽  
Paul E. Kanive ◽  
A. Peter Klimley ◽  
...  
Keyword(s):  
Conservation Status ◽  
White Shark ◽  
Carcharodon Carcharias ◽  
Central California ◽  
Photo Identification ◽  
Marine Predators ◽  
Northeastern Pacific ◽  
The Status ◽  
Credible Intervals ◽  
Guadalupe Island

The decline of sharks in the global oceans underscores the need for careful assessment and monitoring of remaining populations. The northeastern Pacific is the home range for a genetically distinct clade of white sharks ( Carcharodon carcharias ). Little is known about the conservation status of this demographically isolated population, concentrated seasonally at two discrete aggregation sites: Central California (CCA) and Guadalupe Island, Mexico. We used photo-identification of dorsal fins in a sequential Bayesian mark–recapture algorithm to estimate white shark abundance off CCA. We collected 321 photographs identifying 130 unique individuals, and estimated the abundance off CCA to be 219 mature and sub-adult individuals ((130, 275) 95% credible intervals), substantially smaller than populations of other large marine predators. Our methods can be readily expanded to estimate shark population abundance at other locations, and over time, to monitor the status, population trends and protection needs of these globally distributed predators.

Trophic Variation Between the Two Existing Guadalupe Fur Seal Colonies on Guadalupe Island and the San Benito Archipelago, Mexico

2017 ◽  
Vol 43 (1) ◽  
pp. 14-25 ◽  
Author(s):  
María José Amador-Capitanachi ◽  
Xchel G. Moreno-Sánchez ◽  
Ariadna Juárez-Ruiz ◽  
Giulia Ferretto ◽  
Fernando R. Elorriaga-Verplancken
Keyword(s):  
Fur Seal ◽  
Guadalupe Island

What Values Do Tourists Place on a Marine Protected Area? White Shark Cage-Dive Tourists and the Neptune Islands

2019 ◽  
Vol 14 (1) ◽  
pp. 19-30 ◽  
Author(s):  
Kirin Apps ◽  
Kay Dimmock ◽  
David J. Lloyd ◽  
Charlie Huveneers
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
White Shark
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