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11 resultados encontrados para: AUTOR: Sosa Nishizaki, Óscar
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1.
- Tesis
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Distribución potencial de las especies de batoideos de mayor importancia pesquera en el golfo de México / Felipe Ignacio Rocha González
Rocha González, Felipe Ignacio ; Sosa Nishizaki, Óscar (codirector) ; Pérez Jiménez, Juan Carlos (codirector) ;
Ensenada, Baja California, México : Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California , 2018
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2.
- Tesis
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Distribución potencial de tiburones martillo (Género Sphyrna) y su traslapo con el esfuerzo de la pesca artesanal en la costa norte de Campeche, México / Mercedes Yamily Chi Chan
Chi Chan, Mercedes Yamily ; Sosa Nishizaki, Óscar (codirector) ; Pérez Jiménez, Juan Carlos (codirector) ;
Ensenada, Baja California, México : Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California , 2018
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3.
- Artículo con arbitraje
Growth, productivity, and relative extinction risk of a data-sparse devil ray
Pardo, Sebastián A. (coaut.) ; Kindsvater, Holly K. (coaut.) ; Cuevas Zimbrón, Elizabeth (coaut.) ; Sosa Nishizaki, Óscar (coaut.) ; Pérez Jiménez, Juan Carlos (coaut.) ; Dulvy, Nicholas K. (coaut.) ;
Contenido en: Scientific Reports Vol. 6, no. 33745 (September 2016), p. 1-10 ISSN: 2045-2322
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Resumen en: Inglés |
Resumen en inglés

Devil rays (Mobula spp.) face intensifying fishing pressure to meet the ongoing international demand for gill plates. The paucity of information on growth, mortality, and fishing effort for devil rays make quantifying population growth rates and extinction risk challenging. Furthermore, unlike manta rays (Manta spp.), devil rays have not been listed on CITES. Here, we use a published size-at-age dataset for the Spinetail Devil Ray (Mobula japanica), to estimate somatic growth rates, age at maturity, maximum age, and natural and fishing mortality. We then estimate a plausible distribution of the maximum intrinsic population growth rate (rmax) and compare it to 95 other chondrichthyans. We find evidence that larger devil ray species have low somatic growth rate, low annual reproductive output, and low maximum population growth rates, suggesting they have low productivity. Fishing rates of a small-scale artisanal Mexican fishery were comparable to our estimate of rmax, and therefore probably unsustainable. Devil ray rmax is very similar to that of manta rays, indicating devil rays can potentially be driven to local extinction at low levels of fishing mortality and that a similar degree of protection for both groups is warranted.


4.
- Artículo con arbitraje
An analysis of the feasibility of using caudal vertebrae for ageing the spinetail devilray, Mobula japanica (Müller and Henle, 1841)
Cuevas Zimbrón, Elizabeth ; Sosa Nishizaki, Óscar (coaut.) ; Pérez Jiménez, Juan Carlos (coaut.) ; O’Sullivan, John B. (coaut.) ;
Contenido en: Environmental Biology of Fishes DOI: 10.1007/s10641-012-0086-2 (2012) ISSN: 0378-1909
Resumen en: Inglés |
Resumen en inglés

Age assessment of Mobula japanica may be possible using the caudal vertebrae, below the origin of the dorsal fin. This is supported by the significant linear relationship found between disc width (DW) and centrum radius (CR, n055), the continuous record of growth bands in the vertebrae, the clarity to distinguish and count growth bands, and the precision of the band counts. Assuming an annual band formation, the preliminary assessment of the age suggests that M. japanica lives at least 14 years and has a low growth rate (K00.28 year−1). The minimum number of growth bands was one for spinetail devilrays with a 1,210–1,390 mm DW, while the maximum was 14 for a 2,300 mm DW devilray. While age validation is still required, results indicate the feasibility of the use of caudal vertebrae for age estimation. To provide robust estimates of validated age and growth for the spinetail devilray, the sampling coverage needed might imply an international cooperation.


5.
- Artículo con arbitraje
Morphological and molecular differentiation of smooth-hound sharks (Genus Mustelus, Family Triakidae) from the Gulf of California
Pérez Jiménez, Juan Carlos ; Rocha Olivares, A. (coaut.) ; Sosa Nishizaki, Óscar (coaut.) ;
Contenido en: Journal of Applied Ichthyology Vol. 29, no. 1 (February 2013), p. 268–270 ISSN: 0175–8659
Resumen en: Inglés |
Resumen en inglés

The genus Mustelus is the most species-rich of the widespread family Triakidae whereby its taxonomy and systematics have been historically challenging. They represent a significant fraction of the shark catches of small-scale fisheries in the Gulf of California. In order to provide information useful for their management and conservation, the morphological and genetic distinction of the four species found in the northern Gulf of California (M. albipinnis, M. californicus, M. henlei and M. lunulatus) were analyzed. Discriminant analysis of 10 morphometric variables placed each species in a distinct and significantly different region of multivariate morpho-space. The variables contributing most to their distinction were inter-nostril width, mouth length, upper and lower labial furrow length, and mouth width. Restriction fragment length polymorphisms (PCR-RFLP) of the nuclear ITS2 ribosomal DNA (rDNA) confirmed that each species represents a genetically cohesive and independent evolutionary lineage. In spite of the difficulty in differentiating these Mustelus species, a few cephalic measurements are useful to separate them. A PCR-RFLP assay (using RsaI and MspI on ITS2 rDNA amplicons) is also proposed for the molecular differentiation of these commercially harvested smooth-hound sharks, constituting the first molecular marker available for their identification. These data provide morphological and genetic tools that can be used to improve their management and conservation.


6.
- Artículo con arbitraje
*En hemeroteca, SIBE-Campeche
Determining reproductive parameters for population assessments of two smoothhounds (Mustelus californicus and Mustelus lunulatus) from the northern Gulf of California, Mexico
Pérez Jiménez, Juan Carlos ; Sosa Nishizaki, Óscar (coaut.) ;
Contenido en: Bulletin of Marine Science Vol. 86, no. 1 (January 2010), p. 3-13 ISSN: 0007-4977
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
49046-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche
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Resumen en: Inglés |
Resumen en inglés

We estimated the reproductive parameters needed for assessment of the commercially exploited populations of the grey smoothhound Mustelus californicus (Gill, 1864) and the sicklefin smoothhound Mustelus lunulatus (Jordan and Gilbert, 1883) from the northern Gulf of California. Results indicated that females of M. californicus and M. lunulatus reproduce annually; with a gestation of approximately 11 mo (gestation and vitellogenesis were concurrent). Females and males of M. californicus matured at 862 and 728 mm total length (TL), respectively, and females and males of M. lunulatus matured at 1032 and 915 mm TL, respectively. A linear relationship between maternal TL and litter size was estimated for both species. Litter sizes were 7-16 for M. californicus and 6-19 for M. lunulatus. All near-term gravid and postpartum females of both species were caught in the Biosphere Reserve of the Upper Gulf of California and Colorado River Delta (the northernmost region of the gulf) between February and June, which suggests that this area is a pupping ground for both species.


7.
Artículo
Food and feeding habits of the blue shark Prionace glauca caught off Ensenada, Baja California, Mexico, with a review on its feeding
Markaida Aburto, Unai ; Sosa Nishizaki, Óscar (coaut.) ;
Contenido en: Journal of the Marine Biological Association of the United Kingdom Vol. 90, no. 05 (2010), p. 977-994 ISSN: 0025-3154
Resumen en: Inglés |
Resumen en inglés

Stomach contents of 893 blue shark (Prionace glauca) caught off Ensenada, Todos Santos Bay, Baja California, from 1995 to 1997 were analysed. 614 had identifiable food remains. A large variety of pelagic cephalopods occurred in 55.5% of all stomachs and accounted for 46.2% of all prey and 84% by estimated weight of stomach contents. The most abundant (17%) and frequent (32%) was Histioteuthis heteropsis and the most important by estimated weight (22%) was ‘Gonatus californiensis’. Argonauta spp. and Vampyroteuthis infernalis were also abundant prey. A pair of beaks of giant squid Architeuthis sp. constitutes the first record for Mexican waters. Feeding habits and the probability of scavenging on mesopelagic cephalopods is discussed. The single most abundant prey was the pelagic, red crab Pleuroncodes planipes (41.7%). Other prey included teleost fish, amniotes and floating items. Diet varied greatly between months with no clear seasonal pattern. Tiny diet differences due to shark size or sex were inconclusive. A thorough review of studies on blue sharks stomach contents analysis is given. Blue shark feed on a large variety of passive pelagic prey, mainly mesopelagic cephalopods, that could be preyed upon as well as scavenged. Depletion of this predator due to overfishing may be leading to unknown cascading top-down effects in the mesopelagic realm.


8.
Capítulo de libro
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Impacto de los factores antropogénicos de afectación directa a las poblaciones silvestres de flora y fauna
Naranjo Piñera, Eduardo Jorge (autor) (1963-) ; Dirzo, Rodolfo (autor) ; López Acosta, Juan Carlos (autor) ; Rendón von Osten, Jaime (autor) ; Reuter, Adrián (autor) ; Sosa Nishizaki, Óscar (autor) ;
Disponible en línea
Contenido en: Capital natural de México, vol. II: estado de conservación y tendencias de cambio / Sarukhán, J. (coord. gen.) Distrito Federal, México : Comisión Nacional para el Conocimiento y Uso de la Biodiversidad, 2009 p. 247-276 ISBN:978-607-7607-08-3 (Vol. II)
Cerrar
SIBE Campeche
37477-50 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
37477-40 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
37477-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
37477-30 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
37477-60 (Disponible)
Disponibles para prestamo: 1
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Resumen en español

La extracción representa un factor de afectación directa de las poblaciones silvestres de flora y fauna en México. En este capítulo se analiza la magnitud de la extracción de especies vegetales y animales para consumo, para comercialización local y por tráfico ilegal, así como las sinergias entre factores de impacto directo e indirecto. También se incluye un apartado breve sobre los efectos de la contaminación en el deterioro de algunas poblaciones animales en ecosistemas acuáticos. El análisis indica que, fuera de los casos de extracción, principalmente de plantas, en particular cuando involucra un conocimiento tradicional por parte de los pobladores locales, en general esta tiene un impacto negativo importante sobre las poblaciones de varias especies de plantas y animales. Esto se hace evidente sobre todo a partir de la información derivada del estudio de algunas especies de plantas como las cactáceas, las cícadas y las orquídeas, así como de algunas aves, en particular pericos, en el caso de los animales. Asimismo, la información recabada a partir de actividades pesqueras indica un daño profundo sobre las poblaciones de peces. En general los datos apuntan a que la extracción representa, después de la destrucción del hábitat, el segundo factor de más impacto sobre la biodiversidad silvestre, si bien en algunos casos particulares aparece como el factor de mayor afectación

Además del impacto de la extracción directa, este análisis muestra la importancia de las coextinciones resultantes de la extinción colateral de especies que interactúan con las especies dañadas en primera instancia, pero este aspecto se ha estudiado poco en México; lo mismo sucede con la importancia de las sinergias entre la extracción y otros efectos antropogénicos, de los cuales apenas existen algunas investigaciones. Este análisis también muestra que la contaminación de origen orgánico e inorgánico, si bien no es un mecanismo de extracción directa de especies, es un factor importante de deterioro para la flora y fauna terrestres y acuáticas. En general, la información fragmentada que se integró en este capítulo señala una trayectoria de gran impacto antropogénico sobre las poblaciones de flora y fauna del país. Todo esto demanda que se dediquen esfuerzos y atención inmediata para detener, y de ser posible revertir, las proyecciones esbozadas en este análisis. Para alcanzar esta meta es necesario depurar y aplicar los marcos legales vigentes, así como la colaboración entre los sectores gubernamental, académico y social


9.
- Artículo con arbitraje
Reproductive biology of the brown smoothhound shark, Mustelus henlei, in the northern Gulf of California, México
Pérez Jiménez, Juan Carlos ; Sosa Nishizaki, Óscar (coaut.) ;
Contenido en: Journal of Fish Biology Vol. 73, no. 4 (September 2008), p. 782-792 ISSN: 0022-1112
Resumen en: Inglés |
Resumen en inglés

Female brown smoothhound sharks Mustelus henlei were found to reproduce annually. A mature female carried both developing oocytes in the ovary and developing embryos in the uteri concurrently for c. 1 year. A great variability in the size of embryos was recorded each month, and the maximum embryo sizes were found from late January to mid-March. The largest oocytes in mature females were observed in mid-March. Gestation lasted c. 10 months. A linear relationship between maternal total length (LT) and the number of pups per litter (litter size one to 21) was estimated. Birth LT was reached in c. 280 mm. Females and males matured at 570–660 and 550–560 mm LT, respectively. Difference in the litter size among Californian coast (one to 10) and northern Gulf of California (one to 21) populations existed for this smoothhound shark.


10.
- Artículo con arbitraje
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Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
Castillo Géniz, José Leonardo ; Sosa Nishizaki, Óscar (coaut.) ; Pérez Jiménez, Juan Carlos (coaut.) ;
Contenido en: Zootaxa Vol. 1545 (2007), p. 1-16 ISSN: 1175-5326
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Resumen en: Inglés |
Resumen en inglés

Knowledge of taxonomy, systematics and life histories of the skates that inhabit the Gulf of California is scarce. Five species have been documented in the Sea of Cortez: R. cortezensis, R. equatorialis, Raja inornata, R. rhina and R. velezi. The California skate (R. inornata) is the most abundant species caught as by-catch during the hake trawl fishery in the Gulf. Intraspecific variation in the external morphology of R. inornata from the northern Gulf of California, México is described on the basis of 24 proportional morphometric variables from 45 males (227–525 mm total length TL) and 52 females (226-690 mm TL). Males and females had 9 and 14 proportional dimensions respectively that were isometric with total length (TL). Regression slope and elevation analysis revealed that 9 relationships between TL and morphometric variables were sexually dimorphic. A stepwise discriminant function separated three groups of skates (females and males of R. inornata and males of Raja cortezensis) and was able to correctly classify 97%, 100% and 100% of the original grouped cases, respectively. The variables that best discriminated between species and sexes were preorbital length, preoral length, distance between fifth gill openings, maximum distance between pelvic fins, and distance from cloaca to anterior caudal fin. The study also revealed that several of the meristic characters examined showed considerable variation and, therefore, should be used with caution in taxonomic studies.