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      Tarebia granifera (Lamarck, 1822) en la región hidrológica Grijalva-Usumacinta en Tabasco, México Translated title: Tarebia granifera (LAMARCK, 1822) in hydrologic region Grijalva-Usumacinta in Tabasco, Mexico

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          Abstract

          Después del primer hallazgo de Tarebia granifera en septiembre de 2007 en la laguna Tintal, en la Reserva de la Biósfera Pantanos de Centla (RBPC), se realizó una búsqueda en 40 lagunas, 6 ríos, un arroyo y dos drenes: 14 sitios en el municipio de Centla, 3 en Centro, 11 en Paraíso, 1 en Nacajuca, 3 en Cárdenas, 14 en Macuspana y 3 en Jonuta. Los muestreos se realizaron en mayo y septiembre de 2008 y mayo y septiembre de 2009. El muestreo fue al azar tomándose 10 muestras con una draga Van Veen de cinco litros. De los 49 sitios, sólo en 11 de tres municipios se recolectó T. granifera: en el municipio de Centro en L. Pucte y L. la Ceiba; Centla en L. Guanal, L. San Isidro, L. Viento, L. Larga, L. Tintal y L. Concepción; y Macuspana en L. Loncho, L. Ismate-Chilapilla y L. Chilapa. El polígono de distribución de T. granifera está entre las coordenadas UTM 509588-590058 X y 1989183-1976233 Y (17°59'27.3"-17°52'19.3'' N y 92°54'34.0"-92°08'59.7" O). Se considera como centro de introducción y dispersión a la Ciudad de Villahermosa. Las localidades que presentaron las máximas abundancias fueron: L. Tintal con 7,944 individuos, L. Pucte con 7,048 y L. Ismate Chilapilla con 1,268. Se comprueba la competencia de esta especie con Melanoides tuberculata siendo favorecida T. granifera.

          Translated abstract

          After the first finding of Tarebia granifera in September 2007 in Lake Tintal in the Reserva de la Biosfera Pantanos de Centla, a search was conducted in 40 lakes, 6 rivers, 1 stream and two drains: 14 sites from the municipality of Centla, 3 from Centro, 11 from Paraiso, 1 from Nacajuca, 3 from Cardenas, 14 from Jonuta and 3 from Macuspana. Sampling was conducted in September 2008 and May and September 2009. The sampling was random taking 10 samples using five liters Van Veen grab. Tarebia granifera was collected in 11 sites out of 49 in three municipalities: in the town of Centro is was found in L. Pucte and L. La Ceiba; Centla in L. Guanal, L. San Isidro, L. Viento, L. Larga, L. Tintal and L. Concepcion; and Macuspana in L. Loncho, L. Ismate-Chilapilla and L. Chilapa. The polygon of distribution of T. granifera is between the coordinates UTM 509588-590058 X and 1989183-1976233 Y (17°59'27.3"-17°52'19.3"Ny92°54'34.0"-92°08'59.7"W).TheCityofVillahermosaisconsideredas an introduction and dispersal center. The localities that presented the highest abundance values were: L. Tintal with a total 7,944 individuals, L. Pucte with 7,048 and L. Ismate-Chilapilla with 1,268. This study confirms the competence between T. granifera and Melanoides tuberculata being the former favored.

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          An ounce of prevention or a pound of cure: bioeconomic risk analysis of invasive species.

          Numbers of non-indigenous species--species introduced from elsewhere - are increasing rapidly worldwide, causing both environmental and economic damage. Rigorous quantitative risk-analysis frameworks, however, for invasive species are lacking. We need to evaluate the risks posed by invasive species and quantify the relative merits of different management strategies (e.g. allocation of resources between prevention and control). We present a quantitative bioeconomic modelling framework to analyse risks from non-indigenous species to economic activity and the environment. The model identifies the optimal allocation of resources to prevention versus control, acceptable invasion risks and consequences of invasion to optimal investments (e.g. labour and capital). We apply the model to zebra mussels (Dreissena polymorpha), and show that society could benefit by spending up to US$324 000 year(-1) to prevent invasions into a single lake with a power plant. By contrast, the US Fish and Wildlife Service spent US$825 000 in 2001 to manage all aquatic invaders in all US lakes. Thus, greater investment in prevention is warranted.
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            Exotic fishes and other aquatic organisms introduced into North America

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              Trematode parasites (Platyhelminthes) of wildlife vertebrates in Mexico

              Trematodes are one of the world’s most diverse groups of parasitic platyhelminths found in vertebrates. In this book, a parasite-host list, including all species of trematodes recorded in Mexican wildlife, is presented. These parasites have been studied since the 1930s. The first description of a trematode species was published in 1932. After 75 years of taxonomic research on this group, a total number of 624 species belonging to 311 genera and 78 families have been recorded, with a very high percentage of endemicity, since almost 30% represented new species. The inventory presented here results from several years of data compilation obtained from original sources, from various published accounts (Bachelor´s and graduate student’s thesis, book chapters, peer-reviewed publications, etc.), to database information from parasite collections. In this contribution, we present the most updated inventory of this parasitic group, including not only taxonomic information related to each trematode species, but also information about their host(s) and geographical distribution. Most of the records of trematodes we present in the book include remarks or taxonomical comments. These comments are related with their systematic position within current classification schemes, and in some occasions they correspond to synonymies. In all cases the original reference is presented so reader may want to check on the original source. Drawings of representative species of each trematode family presented in the book are shown, as well as pictures of some type-specimens that show some part of the morphological diversity of this group of parasites. A general overview of the information we have gathered thus far indicates that sampling effort has been unequal regarding vertebrate group studied and geographical distribution. Clearly fish, including marine, brackish and freshwater, have been more extensively studied than any other group of vertebrates, and the northern region of the country has been poorly sampled for helminth parasites within all vertebrate groups. The inventory of vertebrate trematodes in Mexico is far from complete. As a result, it is currently not possible to estimate the size of the fauna (i.e. the number of species present), but available information allows for assessments of general biodiversity patterns and the potential for estimates, as a result of inventory compilation and  appropriate  methodologies, of the number of species arising in the near future. The main intention of this book is to present the information we have compiled thus far. This information is found in 568 published accounts, and no previous effort has been made to organize and analyze this enormous amount of data. We are confident that this work will contribute to our knowledge of this parasitic group and settles the stage for future research regarding host-parasite interactions between trematodes and their vertebrate hosts in one of the most important, from a biogeographical perspective, regions of the world. Mexico occupies a transitional position between Nearctic and Neotropical biogeographical regions, so future trematode research may be focused on understanding species distribution, once a more complete inventory is generated.
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                Author and article information

                Journal
                azm
                Acta zoológica mexicana
                Acta Zool. Mex
                Instituto de Ecología A.C. (Xalapa, Veracruz, Mexico )
                0065-1737
                2448-8445
                April 2011
                : 27
                : 1
                : 103-114
                Affiliations
                [01] Villahermosa Tabasco orgnameUniversidad Juárez Autónoma de Tabasco orgdiv1División Académica de Ciencias Biológicas orgdiv2Laboratorio de Malacología MÉXICO ljrangel@ 123456msn.com
                Article
                S0065-17372011000100008 S0065-1737(11)02700100008
                c6f539d9-b5bf-41e9-9689-a827307835e4

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 13 September 2010
                : 23 April 2010
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 34, Pages: 12
                Product

                SciELO Mexico

                Categories
                Artículos originales

                distribution and abundance,Tarebia granifera,Tabasco,distribución y abundancia

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