Short term variations of the anticyclonic circulation in Bahía Sebastián Vizcaíno, BC

Amador-Buenrostro, Alberto; Argote-Espinosa, M.L.; Mancilla-Peraza, M.; Figueroa-Rodríguez, Manuel

doi:10.7773/cm.v21i2.987

Cited by 7 publications

(6 citation statements)

References 4 publications

(12 reference statements)

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“…In comparison with all other sampling areas, the PB region is characterized by the occurrence of a strong coastal southward current 35 and eddies 26,32,48 . Such distinctive oceanographic features in this area allow year‐round upwelling, and high primary production (up to 8 mg/m 3 of chlorophyll‐a 33,48 ).…”

Section: Discussionmentioning

confidence: 95%

“…Near the southern limit of the species, the PE sites showed a homogeneous haplotype frequency. This protruding point, the largest on the entire peninsula of Baja California, has connectivity with the California Current through the anticyclone eddy of San Sebastian in Vizcaino Bay 35 . This eddy brings large amounts of water from the north through the California Current.…”

Section: Discussionmentioning

confidence: 96%

“…This protruding point, the largest on the entire peninsula of Baja California, has connectivity with the California Current through the anticyclone eddy of San Sebastian in Vizcaino Bay. 35 This eddy brings large amounts of water from the north through the California Current. However, in contrast to the PB area, PE would not have any recirculation current to trap and self-recruit unique haplotypes as they occur on the open coast near a deep shelf where the California Current comes very close to shore.…”

Section: Fisheries Sciencementioning

confidence: 99%

“…Along this coast there are particular sites, such as Ensenada and Punta Eugenia, where oceanographic features show seasonal patterns such as eddies and upwellings. 32,33 In contrast, there are other areas that are continuously dominated by more persistent strong upwelling (and the resultant upwelling shadows down-current), such as in Campo Kenedy 34 and Punta Baja, where these features are present all year round; 35 these features could affect larval dispersal or retention, and could result in population structure differences at different temporal and spatial scales. 36 In Mexico, S. purpuratus is the second most important resource for the sea urchin fishery (S. franciscanus is the first 37 ), yet remains unregulated.…”

Section: Introductionmentioning

confidence: 99%

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Population structure of purple sea urchinStrongylocentrotus purpuratusalong the Baja California peninsula

et al. 2008

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Purple sea urchin Strongylocentrotus purpuratus is fished from British Columbia, Canada to Punta Baja, Mexico. The North American population has been divided into northern and southern fishery stocks at the break of Point Conception, but little is known about its southernmost distribution along the Mexican Pacific coast of the Baja California peninsula. In this study purple sea urchin populations in six sites along the Baja California peninsula were analyzed using mitochondrial deoxyribonucleic acid restriction fragment length polymorphism (mtDNA RFLP). A homogeneous distribution of three common haplotypes among all sites was observed. A significant FST value, however, indicated genetic structure mainly due to the haplotype array in San Miguel, Isla Todos Santos and Punta Baja sites, which were characterized by having high haplotype diversity and several unique haplotypes. Homogeneous distribution of haplotypes along the peninsula could have been influenced by the unidirectional California Current system, flowing north to south. Unique haplotypes in Punta Baja and the structure found could be the result of local oceanographic features specific to this major upwelling zone. It may be necessary to consider the Punta Baja populations individually when managing the purple sea urchin fishery in Baja California, as they show signs of being a unique stock.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 96%

Section: Fisheries Sciencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population structure of purple sea urchinStrongylocentrotus purpuratusalong the Baja California peninsula

et al. 2008

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“…patterns that can lead to intense regional upwelling (Mancilla-Peraza et al 1993;Amador-Buenrostro et al 1995;Dailey et al 2021). However, the BSV ecosystem experiences weaker regional upwelling compared to the SCB, both due to BSV being located further south away from the California Current system as well as seasonal cyclonic circulation within the bay (Amador- Buenrostro et al 1995). These factors contribute to a decrease in upwelling intensity at times (Huyer 1983), which is not observed in the SCB.…”

Section: Chemical Variation Between Nursery Regionsmentioning

confidence: 99%

Vertebral Chemistry Distinguishes Nursery Habitats of Juvenile Shortfin Mako in the Eastern North Pacific Ocean

et al. 2023

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Shortfin Mako Isurus oxyrinchus are ecologically and economically important apex predators throughout the global oceans. The eastern North Pacific Ocean contains several coastal nurseries for this species, where juveniles can forage and grow until venturing into offshore pelagic habitats, where seasonal migration and reproduction occurs. Opportunistically sampled vertebrae from both male and female juvenile Shortfin Mako (65.5-134.4 cm total length, neonate to age 2) were sourced from two distinct nurseries in the eastern North Pacific: the Southern California Bight (n = 12), USA, and Bahía Sebastián Vizcaíno (n = 11), Mexico. Mineralized vertebral cartilage was analyzed to determine concentrations of selected elements (Li, Mg, Mn, Zn, Sr, Ba, standardized to Ca) using laser ablation inductively coupled plasma mass spectrometry, targeting growth bands at specific life stages,

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Artisanal fishing activities and their documented interactions with juvenile white sharks inside a nursery area

García‐Rodríguez

2020

Aquatic Conservation

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Juvenile white sharks distribute in coastal nursery areas, which are essential for population growth. Bahía Sebastián Vizcaíno (BSV), Mexico, is a white shark nursery area in the north‐eastern Pacific. Despite existing regulations forbidding the capture of white sharks, incidental catches still occur in some areas. Artisanal fisheries constitute one of the most important economic activities in BSV, yet no formal description of either these fisheries or the incidental catch of juvenile white sharks exists due to the poor data reporting system, thus preventing a clear understanding of the implications of these catches for the white shark population of the north‐eastern Pacific. Artisanal fishing activities and their interactions with juvenile white sharks in BSV are described based on fishermen's knowledge. Artisanal fisheries in BSV are multi‐specific, targeting mostly bottom‐related species (e.g. white seabass and California halibut) that are also common prey for juvenile white sharks. These activities are the only source of income for the majority of fishermen in BSV and are conducted throughout the year, with gillnets being the main fishing gear. White sharks are incidentally caught in bottom gillnets mainly during the summer, although another peak in incidental catch was recorded during winter, possibly related to the presence of juvenile white sharks from California, USA. The most common size of juvenile white sharks incidentally caught was <2 m in the nearshore areas close to the mouth of the Ojo de Liebre Lagoon; larger juveniles (~3 m) were caught in areas near Cedros, Natividad, and San Benito Islands. The multi‐specific nature of BSV artisanal fisheries and their socio‐economic value, and the high post‐release survival of juvenile white sharks suggest that future regulatory actions should focus on the release of incidentally caught live juvenile white sharks and the involvement of the BSV fishing community to increase the effectiveness of management efforts.

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Short term variations of the anticyclonic circulation in Bahía Sebastián Vizcaíno, BC

Cited by 7 publications

References 4 publications

Population structure of purple sea urchinStrongylocentrotus purpuratusalong the Baja California peninsula

Population structure of purple sea urchinStrongylocentrotus purpuratusalong the Baja California peninsula

Vertebral Chemistry Distinguishes Nursery Habitats of Juvenile Shortfin Mako in the Eastern North Pacific Ocean

Artisanal fishing activities and their documented interactions with juvenile white sharks inside a nursery area

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