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Copyright of Revista de Economía (Universidad Autónoma de Yucatán) is the property of Universidad Autonoma de Yucatan, Facultad de Economia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bio-grafía. Escritos Sobre la Biología y su Enseñanza is the property of Universidad Pedaggica Nacional and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective. To assess the community structure of helminths and parasitic crustaceans in the splittail bass Hemanthias peruanus (Steindachner, 1875) from northern Peru. Materials and methods. 75 specimens (34 males and 41 females) of H. peruanus were captured from Puerto Cabo Blanco, Piura, Peru. Total length and sex data of the fish were recorded. For the analysis of the parasitic community, the ecological parasitological indices, aggregation indices, alpha diversity indices and association between the biometric parameters of the fish and the parasitological indices were calculated. Results. The percentage of total prevalence in maidens infected with at least one parasitic metazoan species was 65.33%, that is, 49 parasitized hosts. The community component of the parasitic eumetazoan fauna in the evaluated fish was dominated by the presence of ectoparasites (three species of monogeneans and one species of isopod). Endoparasite abundance (two species of trematodes, one species of tapeworms and one species of acanthocephalan) was comparatively low. Biotic factors such as fish length and sex were not found to be related to parasitological indices of any parasitic species. The lack of association is probably due to the influence of other biotic or abiotic factors. The most prevalent parasites presented an aggregate type distribution. The Chao-1 estimator indicates that the expected richness was eight. Conclusions. We registered H. peruanus as a new host for Ceratothoa gaudichaudii, Corynosoma australe, Parancylodiscoides signifer, Pronotogrammella scholzi and Scolex pleuronectis. [ABSTRACT FROM AUTHOR]

Archaeomalacology is a relatively recent discipline that is based on the study of molluscs in archaeological contexts. In this first work of the present special monography it tries to present an overview of its origins, in the 19th century, and how it has evolved and incorporated techniques and advances from archeology as well as paleontology, zoology or ecology, to create its own corpus, allowing to obtain a more complete vision of past societies and their relationship with their natural environment thanks to the study of mollusks and to a lesser extent other marine invertebrates (echinoderms, crustaceans and anthozoans, mainly). Since 2010, the Scientific Meetings of Archaeomalacology of the Iberian Peninsula (RCAPI) have been organized regularly and at the end of 2019 the sixth edition was held in Mallorca. In this book, 16 works are presented, which show the current advances and tendencies of archaeomalacology in the Iberian Peninsula, the Mediterranean and the Canary Islands. [ABSTRACT FROM AUTHOR]

This compilation presents a historical synthesis of the studies carried out (publications, thesis, monogrphs) on the zooplankton in the Bay of Mochima, Sucre State, Venezuela. The Plankton Laboratory of the Institute of Zoology and Tropical Ecology (IZET) and the Zooplankton Laboratory of the Venezuelan Oceanographic Institute (IOV) have carried out numerous studies of the zooplankton community, in which they emphasize taxonomic and ecological aspects including the effects of upwelling events. Among these, the level of information is very uneven. A list of zooplankton composition and richness is presented. The holoplankton components include jellyfish (19 species), siphonophores (5 species), copepods (75 species), cladocerans (4 species), chaetognatha (3 species), holoplanktonic mollusks (2 species), mysidacea (2 species), appendicularians (16 species). Within the meroplankton are larvae of decapod crustaceans, cirripedes and ichthyoplankton. In general, copepods were the most abundant group, with differences in upwelling events and represented the highest proportion of biomass. Temporal and spatial biomass fluctuations, zooplankton abundance and related physical and chemical variables were analyzed. However, the variables needed to estimate production, such as annual cycles and trophic relationships, have been poorly studied. Depending on the lack of information, the main problems were identified and recommendations for future research are proposed. [ABSTRACT FROM AUTHOR]

Copyright of Revista Mexicana de Biodiversidad is the property of Universidad Nacional Autonoma de Mexico, Instituto de Biologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Mexicana de Biodiversidad is the property of Universidad Nacional Autonoma de Mexico, Instituto de Biologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Spanish Journal of Rural Development is the property of Spanish Journal of Rural Development and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objetive. The entrance dynamics of family Psittacidae to the Wildlife Attention and Valuation Center (CAV - CVS) was determined. Materials and methods. Data were obtained between 2007 to 2009. A frequency analysis for the variables species, entrance type and time (months and years) was implemented. For the variable months an analysis of mean difference was applied and the relationship entrance of the species versus the months of the year by means of a stripplot was presented. Results. The Family Psittacidae presented 58% of the total of birds that entered the CAV-CVS, samples collected from public markets and highways of the department of Córdoba. The species with more entrance frequency was Brotogeris jugularis, with 73.99% of the total of individuals, being that specie the one that obtained higher entrances throughout the year. Significant differences in incoming samples per month (χ² =26.785, df=11, p=0.004951), were also detected. Conclusions. The dry season, confluent with festivities in the department, presented the highest values of incomings to the center. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Toxicología is the property of Asociacion Espanola de Toxicologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Monitoring introduced species is an important management tool in order to preserve native species. The aim of this study was to monitor the feral dog's population in Isla de Cedros and to identify actual and potential threats of their presence over the native mastofauna. Data were collected at two sampling areas of the island, the Northeast Coast (CNE) and the Central-South Region (RCS). Dog's distribution pattern and density was assess using a non-invasive method based on scat counts along transect surveys and relative density (R) and faecal relative abundance index (fRAI) were estimated. Dog's diet composition was evaluated by scat analysis. Both R and fRAI were significant greater (P < 0.05) in the CNE than in the RCS. The results showed that feral dogs are feeding from at least three endemic terrestrial mammal species (the mule deer, the brush rabbit, and the Anthony's pocket mouse) and two pinnipeds species (the northern elephant seal and the California sea lion). With this study provide a useful baseline for future comparison and monitoring and control purposes. Nevertheless, it is necessary to conduct studies about the dog's feeding behavior to measure their predatory activity and to assess the associated damage level. Also, due to the fact that interactions between dogs and pinnipeds appeared frequently and because they are phylogenetically related, the greatest threat of the dog's presence is that it could be a disease vector, with serious health outcomes for the wildlife. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Investigación is the property of Universidad Pedagogica Experimental Libertador and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The common house gecko, Hemidactylus frenatus, is a native species from Asia and the Indo-Pacific region. It has been found extensively in areas of the tropics both in the Old as well as the New World. Through the revision of museum specimens, we found 32 H. frenatus that have been erroneously identified with another invasive species, H. angulatus. The first record of H. frenatus in Colombia was reported in 2000 from the Magdalena Medio region, since that date to the present, the species has been founded in different localities into the Caribbean, Andean valleys, Pacific coastal and Orinoquia. The species has predilection for urban and suburban environments, but no records exist on its natural environment. According to our observations, this gecko is now more abundant than its conspecific, H. angulatus, and therefore we assume a strong competition between both species as well as other native and exotic geckos, mainly those that inhabit the San Andrés and Providencia islands. We recommend future studies that examine the degree of pressure and competition of H. frenatus on other native and exotic species of lizards. [ABSTRACT FROM AUTHOR]

The abundance and species richness of Orthoptera fluctuate throughout time. The dynamics of species abundance can be influenced by seasonal climatic factors. Here we report the species richness, and nymph and adult abundance of Orthoptera species, throughout a year of sampling at Parque Nacional El Cimatario, Querétaro state, in México. These three phenologic variables (species richness, nymph and adult abundance), using non-parametric analyzes were related to the monthly temperature and relative humidity averages, and with the monthly total precipitation recorded during the sampling year. We tested the immediate effects of climatic factors, and their delay from the phenologic variables of one, two, and three months. Moreover, we determined diverse groups of species with similar adult and nymph phenology. A total of 38 species from 31 genera was found. Seventy-nine percent of the species belonged to the Caelifera suborder. The most abundant species was Dichopetala n. sp. "cercus I tauriformis" (Phaneropterinae), followed by Phoetaliotes nebrascensis (Melanoplinae), Dichopetala serrifera, Schistocerca cohni (Cyrthacantacridinae), and Amblytropidia mysteca (Gomphocerinae). We found some correlations between the species, the nymph and the adult numbers with the climatic factors without and with delay from one to three months. Among a selection of the 18 most abundant species, we found diverse phenologic groups of species in the sampled year. This study contributes to the knowledge of the Orthoptera diversity of Querétaro and its relation with climate. [ABSTRACT FROM AUTHOR]

The article offers information on the new specimen of the Colombian weasel, Mustela felipei, along with its distribution and conservation. It notes that the new specimen of M. felipei forms the sixth confirmed record for the species. It adds that the identification of two Ecuadorian specimens from Mera and Valle de Tumbaco were also reconsidered. It suggests a model of possible distribution of the species developed with the Maxent algorithm. Moreover, it proposes the establishment of systematic censuses and monitoring plans across the areas protected for M. felipei.

Perturbation on natural predation in a driest year (1988) on eight grasshopper species assembly during an outbreak of one of them (Boopedon nubilum) in a toboso arid grassland in Chihuahuan Desert was analyzed. We used a four blocks trial with a treatment (predators' decreased) and a control. Predators recorded were five mammals, five reptiles, two amphibians, 20 birds, six diurnal Insects, six spiders and four nocturnal arthropods. The vertebrate predators presence (principally raptors) inhibited invertebrate predators action, the most important predators were birds. Results showed no significative effect of date and treatment on grasshopper density (pooled data). The effect of predation on the most abundant grasshopper species (B. nubilum) was observed, changing the species composition of the assembly and the use of plant stratification by grasshoppers. The graminicole species showed an escape strategy of jumping between grasses, tussocks, bunches or to bare soil, or only keep down into the grass, using this strategy, vulnerability (detection risk by predators) depends on their coloration and final position adopted to avoid predators. The short time effect results were due by short time response in treatment add to the predation satiation phenomena by over offer of meal in this specific patch by the outbreak grasshopper species. Where control and treatment showed clearly negative tendency on the population records of B. nubilum and a natural effect of predation, but our statistical analysis showed no significative differences, suggesting it is more adequate to do this kind of trials, considering a larger remotion of predators and monitoring and evaluating on next generation of grasshopper species. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Geografía Agrícola is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Four surveys (October 2001, and January, April and June 2002) were conducted at nine sites around the Espíritu Santo Archipelago, Baja California Sur, Mexico, to identify spatiotemporal variation patterns in the structure of the rocky, shallow-bottom macroinvertebrate community. The abundance of the conspicuous macrobenthos (gastropods, bivalves and echinoderms) was estimated visually by free diving at 4-6 m depth along two band-transects parallel to the coastline. Each transect was 5 m wide and 50 m long, covering an area of 500 m² per site. Sea surface temperature, wave exposure, type of substrate and slope were also recorded. Thirty-two species were identified. The echinoderms were the best represented group, with 18 species from 13 families, followed by the molluscs, with 14 species from 13 families. The highest mean abundance and density values were recorded for Tripneustes depressus (140.25 ± 64.21 ind and 0.28 ind m-2, respectively). There were no significant differences in diversity, equitability and species richness among sampling months, though differences were found among sites (P < 0.05). A spatial diversity pattern was identified, with low values (0.4 bits ind-1) for exposed shores and high values (2.0 bits ind-1) for semi-protected areas. [ABSTRACT FROM AUTHOR]

The article presents an analysis about the temporal dynamic and spatial variation of density, sexual and non adult proportion of Cyclura nubila nubila, a species of iguana, at Fauna Refuge Cayos de San Felipe in Cuba. The habitat of the iguana was evaluated in terms of vegetation and ground condition. Researchers observed that an iguana has an average of two shelter.

The loss of amphibian populations is a phenomenon that has been occurring on a global scale over the last decade, and to date there is no fully satisfactory explanation of the underlying reason(s) behind this loss. Herein I briefly review the historical context of the phenomenon and discuss how assessments of population status can be influenced by issues of biological identity. [ABSTRACT FROM AUTHOR]