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Papers by Rogelio Gonzalez Armas

Research paper thumbnail of The use of machine learning to detect foraging behaviour in whale sharks: a new tool in conservation

Journal of Fish Biology, 2020

In this study we present the first attempt at modelling the feeding behaviour of whale sharks usi... more In this study we present the first attempt at modelling the feeding behaviour of whale sharks using a machine learning analytical method. A total of eight sharks were monitored with tri‐axial accelerometers and their foraging behaviours were visually observed. Our results highlight that the random forest model is a valid and robust approach to predict the feeding behaviour of the whale shark. In conclusion this novel approach exposes the practicality of this method to serve as a conservation tool and the capability it offers in monitoring potential disturbances of the species.

Research paper thumbnail of Confirmation of the spawning area of the striped marlin, <i>Tetrapturus audax</i> , in the so‐called core area of the eastern tropical Pacific off Mexico

Fisheries Oceanography, Sep 1, 1999

Research paper thumbnail of Ampliaciones de ámbito Vol.41 (3B)

Revista De Biologia Tropical, 1993

Research paper thumbnail of First record of the dinoflagellate Prorocentrum panamense (Prorocentrales, dinophyceae) in the Mexican Pacific from the Archipiélago de Revillagigedo

CICIMAR Oceánides, 2017

The dinoflagellate Prorocentrum panamense is reported for the first time on the Pacific coast of ... more The dinoflagellate Prorocentrum panamense is reported for the first time on the Pacific coast of Mexico. Ten cells of P. panamense were found in network samples from surface waters in three islands of the Revillagigedo Archipelago where samples were collected in March 2017. The sampling sites They had a depth of approximately 60-70 m and the surface temperature of the water was between 21 and 23 ºC.

Research paper thumbnail of Trace elements in the whale shark Rhincodon typus liver: an indicator of the health status of the ecosystem base (plankton)

Latin American Journal of Aquatic Research, 2021

Research paper thumbnail of Diving deeper into the underlying white shark behaviors at Guadalupe Island, Mexico

Ecology and Evolution, 2021

Research paper thumbnail of Description of first nursery area for a pygmy devil ray species (Mobula munkiana) in the Gulf of California, Mexico

Scientific Reports, 2021

Munk’s pygmy devil rays (Mobula munkiana) are medium-size, zooplanktivorous filter feeding, elasm... more Munk’s pygmy devil rays (Mobula munkiana) are medium-size, zooplanktivorous filter feeding, elasmobranchs characterized by aggregative behavior, low fecundity and delayed reproduction. These traits make them susceptible to targeted and by-catch fisheries and are listed as Vulnerable on the IUCN Red List. Multiple studies have examined fisheries impacts, but nursery areas or foraging neonate and juvenile concentrations have not been examined. This study describes the first nursery area for M. munkiana at Espiritu Santo Archipelago, Mexico. We examined spatial use of a shallow bay during 22 consecutive months in relation to environmental patterns using traditional tagging (n = 95) and acoustic telemetry (n = 7). Neonates and juveniles comprised 84% of tagged individuals and their residency index was significantly greater inside than outside the bay; spending a maximum of 145 consecutive days within the bay. Observations of near-term pregnant females, mating behavior, and neonates indi...

Research paper thumbnail of Characterizing Behaviors of the Worlds Largest Shark Though the Application of Machine Learning Algorithms

Research paper thumbnail of Primer registro de albinismo en Cephaloscyllium ventriosum

Research paper thumbnail of Pelagic fish assembleges at the Espiritu Santo seamount in the Gulf of California during El Niño 1997-1998 and non-El NIño conditions

3 CICESE, La Paz, B.C.S., Mexico 4 ABSTRACT Plankton samples and visual census from December 1995... more 3 CICESE, La Paz, B.C.S., Mexico 4 ABSTRACT Plankton samples and visual census from December 1995 to December 1998 were obtained to study adult and larvae assemblages of fish at El Bajo Espiritu Santo (EBES) seamount. Tagging experiments of yellow fin tuna were carried out from April to September 1998. Records of tagged fish at EBES were registered until February 2000. Five oceanographic cruises were also carried out. Visual census of adult fish suggest that El Nino conditions favor migration of tropical species to EBES. Diversity index showed higher values of 4.5 compared to non-El Nino years of 3.5 in 1996. An increased number of species, 85, in 1998 was observed in comparison to 53 of 1996. Larval fish assemblages indicate a decreased diversity index values during El Nino condi- tions. However, more than 50% of larval fishes during El Nino conditions belong to mesopelagic species of tropical affinity. Rarefaction curves of larval fish showed higher than expected number of species...

Research paper thumbnail of Seasonal trends in whale shark Rhincodon typus sightings in an established tourism site in the Gulf of California, Mexico

Journal of Fish Biology

The number of individual whale shark Rhincodon typus sightings registered October 2015-March 2018... more The number of individual whale shark Rhincodon typus sightings registered October 2015-March 2018 in Bahia de La Paz, Mexico, ranged from 73 to 129 animals per season (total 1662), with the majority of them identified as males. Density plot maps showed high correlations in sightings between sample seasons and revealed potential hotspot areas. Our study provides an essential baseline of information for the management of whale shark conservation and the associated touristic activities in the region. This article is protected by copyright. All rights reserved.

Research paper thumbnail of Interannual variability in the trophic status and water quality of Bahía Magdalena, Mexico, during the 2015–2018 period: TRIX

Regional Studies in Marine Science

Research paper thumbnail of Bioaccumulation and trophic transfer of potentially toxic elements in the pelagic thresher shark Alopias pelagicus in Baja California Sur, Mexico

Marine Pollution Bulletin

Research paper thumbnail of The influence of zooplankton communities on the feeding behavior of whale shark in Bahia de La Paz, Gulf of California

Revista Mexicana de Biodiversidad

Research paper thumbnail of Larval fish community structure in a seamount of the Gulf of California

Larval fish community structure in El Bajo Espíritu Santo seamount from the southern part of the ... more Larval fish community structure in El Bajo Espíritu Santo seamount from the southern part of the Gulf of California was studied. Fish larvae were identified and grouped in 48 families, 84 genera and 76 species. Their biological richness constitutes about 30% of the actual Gulf of California fishes. Numerically dominant taxa were represented by individuals whose adults belong to the

Research paper thumbnail of Occurrence of Pyrodinium bahamense var. compressum along the southern coast of the Baja California Peninsula

Marine Pollution Bulletin, 2011

Research paper thumbnail of Diurnal vertical motions over a seamount of the southern Gulf of California

Journal of Marine Systems, 2004

Research paper thumbnail of Confirmation of the spawning area of the striped marlin, Tetrapturus audax, in the so-called core area of the eastern tropical Pacific off Mexico

Fisheries Oceanography, 1999

Research paper thumbnail of A new regional record for the pandarid copepod, Dinemoura producta (Müller, 1785), parasitic on the shortfin mako shark captured off Cabo San Lucas, Mexico

Research paper thumbnail of Pelagic fish assemblages at the Espíritu Santo seamount in the Gulf of California during El Niño 1997-1998 and non-El Niño conditions

Research paper thumbnail of The use of machine learning to detect foraging behaviour in whale sharks: a new tool in conservation

Journal of Fish Biology, 2020

In this study we present the first attempt at modelling the feeding behaviour of whale sharks usi... more In this study we present the first attempt at modelling the feeding behaviour of whale sharks using a machine learning analytical method. A total of eight sharks were monitored with tri‐axial accelerometers and their foraging behaviours were visually observed. Our results highlight that the random forest model is a valid and robust approach to predict the feeding behaviour of the whale shark. In conclusion this novel approach exposes the practicality of this method to serve as a conservation tool and the capability it offers in monitoring potential disturbances of the species.

Research paper thumbnail of Confirmation of the spawning area of the striped marlin, <i>Tetrapturus audax</i> , in the so‐called core area of the eastern tropical Pacific off Mexico

Fisheries Oceanography, Sep 1, 1999

Research paper thumbnail of Ampliaciones de ámbito Vol.41 (3B)

Revista De Biologia Tropical, 1993

Research paper thumbnail of First record of the dinoflagellate Prorocentrum panamense (Prorocentrales, dinophyceae) in the Mexican Pacific from the Archipiélago de Revillagigedo

CICIMAR Oceánides, 2017

The dinoflagellate Prorocentrum panamense is reported for the first time on the Pacific coast of ... more The dinoflagellate Prorocentrum panamense is reported for the first time on the Pacific coast of Mexico. Ten cells of P. panamense were found in network samples from surface waters in three islands of the Revillagigedo Archipelago where samples were collected in March 2017. The sampling sites They had a depth of approximately 60-70 m and the surface temperature of the water was between 21 and 23 ºC.

Research paper thumbnail of Trace elements in the whale shark Rhincodon typus liver: an indicator of the health status of the ecosystem base (plankton)

Latin American Journal of Aquatic Research, 2021

Research paper thumbnail of Diving deeper into the underlying white shark behaviors at Guadalupe Island, Mexico

Ecology and Evolution, 2021

Research paper thumbnail of Description of first nursery area for a pygmy devil ray species (Mobula munkiana) in the Gulf of California, Mexico

Scientific Reports, 2021

Munk’s pygmy devil rays (Mobula munkiana) are medium-size, zooplanktivorous filter feeding, elasm... more Munk’s pygmy devil rays (Mobula munkiana) are medium-size, zooplanktivorous filter feeding, elasmobranchs characterized by aggregative behavior, low fecundity and delayed reproduction. These traits make them susceptible to targeted and by-catch fisheries and are listed as Vulnerable on the IUCN Red List. Multiple studies have examined fisheries impacts, but nursery areas or foraging neonate and juvenile concentrations have not been examined. This study describes the first nursery area for M. munkiana at Espiritu Santo Archipelago, Mexico. We examined spatial use of a shallow bay during 22 consecutive months in relation to environmental patterns using traditional tagging (n = 95) and acoustic telemetry (n = 7). Neonates and juveniles comprised 84% of tagged individuals and their residency index was significantly greater inside than outside the bay; spending a maximum of 145 consecutive days within the bay. Observations of near-term pregnant females, mating behavior, and neonates indi...

Research paper thumbnail of Characterizing Behaviors of the Worlds Largest Shark Though the Application of Machine Learning Algorithms

Research paper thumbnail of Primer registro de albinismo en Cephaloscyllium ventriosum

Research paper thumbnail of Pelagic fish assembleges at the Espiritu Santo seamount in the Gulf of California during El Niño 1997-1998 and non-El NIño conditions

3 CICESE, La Paz, B.C.S., Mexico 4 ABSTRACT Plankton samples and visual census from December 1995... more 3 CICESE, La Paz, B.C.S., Mexico 4 ABSTRACT Plankton samples and visual census from December 1995 to December 1998 were obtained to study adult and larvae assemblages of fish at El Bajo Espiritu Santo (EBES) seamount. Tagging experiments of yellow fin tuna were carried out from April to September 1998. Records of tagged fish at EBES were registered until February 2000. Five oceanographic cruises were also carried out. Visual census of adult fish suggest that El Nino conditions favor migration of tropical species to EBES. Diversity index showed higher values of 4.5 compared to non-El Nino years of 3.5 in 1996. An increased number of species, 85, in 1998 was observed in comparison to 53 of 1996. Larval fish assemblages indicate a decreased diversity index values during El Nino condi- tions. However, more than 50% of larval fishes during El Nino conditions belong to mesopelagic species of tropical affinity. Rarefaction curves of larval fish showed higher than expected number of species...

Research paper thumbnail of Seasonal trends in whale shark Rhincodon typus sightings in an established tourism site in the Gulf of California, Mexico

Journal of Fish Biology

The number of individual whale shark Rhincodon typus sightings registered October 2015-March 2018... more The number of individual whale shark Rhincodon typus sightings registered October 2015-March 2018 in Bahia de La Paz, Mexico, ranged from 73 to 129 animals per season (total 1662), with the majority of them identified as males. Density plot maps showed high correlations in sightings between sample seasons and revealed potential hotspot areas. Our study provides an essential baseline of information for the management of whale shark conservation and the associated touristic activities in the region. This article is protected by copyright. All rights reserved.

Research paper thumbnail of Interannual variability in the trophic status and water quality of Bahía Magdalena, Mexico, during the 2015–2018 period: TRIX

Regional Studies in Marine Science

Research paper thumbnail of Bioaccumulation and trophic transfer of potentially toxic elements in the pelagic thresher shark Alopias pelagicus in Baja California Sur, Mexico

Marine Pollution Bulletin

Research paper thumbnail of The influence of zooplankton communities on the feeding behavior of whale shark in Bahia de La Paz, Gulf of California

Revista Mexicana de Biodiversidad

Research paper thumbnail of Larval fish community structure in a seamount of the Gulf of California

Larval fish community structure in El Bajo Espíritu Santo seamount from the southern part of the ... more Larval fish community structure in El Bajo Espíritu Santo seamount from the southern part of the Gulf of California was studied. Fish larvae were identified and grouped in 48 families, 84 genera and 76 species. Their biological richness constitutes about 30% of the actual Gulf of California fishes. Numerically dominant taxa were represented by individuals whose adults belong to the

Research paper thumbnail of Occurrence of Pyrodinium bahamense var. compressum along the southern coast of the Baja California Peninsula

Marine Pollution Bulletin, 2011

Research paper thumbnail of Diurnal vertical motions over a seamount of the southern Gulf of California

Journal of Marine Systems, 2004

Research paper thumbnail of Confirmation of the spawning area of the striped marlin, Tetrapturus audax, in the so-called core area of the eastern tropical Pacific off Mexico

Fisheries Oceanography, 1999

Research paper thumbnail of A new regional record for the pandarid copepod, Dinemoura producta (Müller, 1785), parasitic on the shortfin mako shark captured off Cabo San Lucas, Mexico

Research paper thumbnail of Pelagic fish assemblages at the Espíritu Santo seamount in the Gulf of California during El Niño 1997-1998 and non-El Niño conditions