Centro Universitario Of La Costa Sur

num., Mexico

Centro Universitario Of La Costa Sur

num., Mexico
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Lerma M.,Terra Peninsular Asociacion Civil | Castillo-Guerrero J.A.,University of Guadalajara | Palacios E.,Centro Universitario Of La Costa Sur
Waterbirds | Year: 2017

The American Oystercatcher (Haematopus palliatus frazari) is federally listed as endangered in Mexico due to habitat loss and small population size. Recent surveys indicate that the State of Sinaloa supports about half of the breeding population in Mexico. However, no information is available about the non-breeding ecology in Mexico. To assess American Oystercatcher distribution, abundance, and roosting habitat use during the nonbreeding season (3 August 2014-23 January 2015), six bays were surveyed in Sinaloa. A total of 1,351 American Oystercatchers were detected using this area based on maximum count per roosting site at or near high tide. American Oystercatchers roosted in flocks of variable size (3-253 individuals per flock) with Bahía Santa María hosting the main roosting sites in Sinaloa. Mangrove islands and mudflats had larger numbers of individuals than expected relative to the availability of those habitats. The non-breeding Sinaloa population comprised approximately 45.0% of the total H. p. frazari population estimate (n = 3,000 individuals). Bahía Santa María represented 74.6% of the non-breeding population observed in Sinaloa. Thus, Sinaloa, and particularly Bahía Santa María, stand out as critical sites for the conservation of this subspecies. Hypothesized threats to American Oystercatchers were predators, livestock, and human activities. Received 31 July 2015, accepted 22 April 2016.

Tapia-Gonzalez J.M.,University of Guadalajara | Alcazar-Oceguera G.,University of Guadalajara | Macias-Macias J.O.,University of Guadalajara | Contreras-Escareno F.,Centro Universitario Of La Costa Sur | And 3 more authors.
Revista Mexicana De Ciencias Pecuarias | Year: 2017

Nosemosis is caused by Nosema spp microsporidium that parasites the midgut of adult worker bees, it is mortal in its acute form and causes very important economic losses for the beekeeper. The knowledge of the infection caused by N. spp in worker bees can help to prevent the spreading or control infection between colonies. The objective of the present work was to determine the presence and intensity of infection of N. spp in worker bees' colonies and its relation with temperature, pluvial precipitation and altitude in this region. Samples of Apis mellifera workers (n=352) were obtained from eight municipalities of south southwest of Jalisco. For the diagnosis, the abdomen tenderize method (Cantwell) was used and the Jaycox method to obtain the number of spores by bee. One hundred percent of the samples resulted positive, and 83.75 % of them between 1 to 5 million spores of by bee was presented. Weak correlations were obtained between the intensity of infection with the altitude (r= -0.35), the temperature (r= 0.44) and the pluvial precipitation (r= -0.12), for what can be suggested that these parameters do not majorly influence the presence of the disease. The obtained results suggest that all workers bees' colonies of the sampled municipalities should be treated in a periodic way with antibiotics, or biologic control removing each year older honeycombs in the colonies and the annual change of queens.

SCOTT-MORALES L.M.,Autonomous University of Nuevo León | VELA-COIFFIER P.,Monterrey Institute of Technology | COTERA-CORREA M.,Autonomous University of Nuevo León | ALMEJO-RAMOS M.,Centro Universitario Of La Costa Sur | CANALES-DELGADILLO J.,National Autonomous University of Mexico
Bird Conservation International | Year: 2017

Information deficit constrains our capacity to assess the status of threatened species in regional and global contexts. In this study of the endangered Worthen’s Sparrow Spizella wortheni, we first review its current and potential distribution using the species distribution software, Maxent. An initial basic model was constructed using historical records, and used to guide a subsequent search for additional populations in summer 2013. Using the information gathered from our survey, we built a second, breeding model, to update the current and potential species distribution. Population size was estimated using line transects of variable length to count singing males and calculate densities per 10 ha. We found 10 new small reproductive populations dispersed south of the established core area, increasing the extent of occurrence of the species from 25 km2 to almost 17,000 km2. Suitable habitat across the species’ range was more than threefold higher in the breeding compared with the basic model. We counted 316 males, with a mean density of four individuals per 10 ha. Our results demonstrate that conservation assessment based on limited records can exaggerate the vulnerability of species, and confirm that the Worthen’s Sparrow population and geographic distribution range are larger than previously determined, indicating that the Red List status of this species should be reconsidered. The use of niche models was successful in enhancing species information data quantity (e.g. range extensions) and quality (e.g. more precise habitat requirements), facilitating improved understanding of needs and conservation status in the wild. Copyright © BirdLife International 2017

Gonzalez-Diaz S.,Sede Universitaria Municipal Hermanos Saiz Montes de Oca | Rivera-Cervantes L.E.,Centro Universitario Of La Costa Sur | Cuevas-Guzman R.,Centro Universitario Of La Costa Sur | Solis-Magallanes J.A.,Centro Universitario Of La Costa Sur | Santana-Michel F.J.,Centro Universitario Of La Costa Sur
Revista Chapingo, Serie Ciencias Forestales y del Ambiente | Year: 2012

The incidence of insect predators on orchids was evaluated in seven plots located at the Las Joyas Research Station (LJRS), Jalisco, Mexico. This research was conducted between September 2009 and February 2010. A total of 130 species from 16 orchid genera were identified. S. martiniana, C. pendula, O. tigrinum and R. splendens were the main host orchid species. All of them showed significant damages in their organs due to the incidence of phytophagous Hemiptera. M. lutem and A. spiraecola (Patch) were the phytophagous insect species that provoked major damage in orchids. Insects caused significant damages in species located in anthropised areas. This assessment would improve the current conservation strategy of Orchidaceae in Jalisco.

Cabrera Y.,Ministerio de la Industria Alimentaria | Aguilar C.,Centro Universitario Of La Costa Sur | Gonzalez-Sanson G.,Centro Universitario Of La Costa Sur | Marquez-Farias J.F.,Autonomous University of Sinaloa
Latin American Journal of Aquatic Research | Year: 2016

Isurus oxyrinchus is a species mostly caught on pelagic longline fisheries. In this study, the occurrence of I. oxyrinchus pregnant female caught to northwest of Cuba is reported; we describe for the first time the development stage of the embryos for this region and compare its development phase with previous surveys carried out in other regions. The adult specimen measured 365 cm TL and had 12 embryos. Regarding the whole litter only a male of 39.3 cm (TL) and a female of 39.2 cm (TL) could be examined. The most evident feature about the embryos was the development of a big abdomen full of small follicles with yolk, corresponding to the oophagic phase. This provides enough energy for their growth and development during the gestation period. This current paper is the first record about second phase or half-term litter of embryonic development for I. oxyrinchus in Cuban waters and it complements the information concerning the knowledge of the reproductive biology of this species. © 2016, Escuela de Ciencias del Mar. All rights reserved.

Macias-Macias J.O.,Centro Universitario Of La Costa Sur | Quezada-Euan J.J.G.,Autonomous University of Yucatán | Contreras-Escareno F.,Centro Universitario Of La Costa Sur | Tapia-Gonzalez J.M.,University of Guadalajara | And 2 more authors.
Apidologie | Year: 2011

The objective of this study was to evaluate the temperature sensitivity of three stingless bee species, one from the tropical highland transition Neartic-Neotropical region (Melipona colimana) and two from the tropical lowland regions (Melipona beecheii and Scaptotrigona hellwegeri) of Mexico. The changes in thoracic temperature, behavior, and mortality rate of workers and pupae of the three species submitted to control high and low temperatures were assessed. Workers of highland M. colimana regurgitated water and fanned their wings when submitted to high temperatures, a behavior reported here for the first time in a stingless bee. M. colimana consumed syrup and increased its thoracic temperature in response to cold environment. Workers and pupae of M. colimana experienced lower mortality rates than M. beecheii and S. hellwegeri. The results of this study showed the tolerance of M. colimana to a wider temperature range, possibly as a response to extreme conditions in its native environment. The implications of thermal susceptibility differences for the conservation of highland and lowland stingless bees are discussed. © 2011 INRA, DIB-AGIB and Springer Science+Business Media B.V.

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