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482F128bd669d32ae6def2fe373 ESCORPIONES DEL DESIERTO COSTERO CHILENORevista Chilena de Historia Natural407 79: 407-421, 2006 Comunidades de escorpiones (Arachnida: Scorpiones) del desierto costero transicional de Chile Communities of scorpions (Arachnida: Scorpiones) of the transitional coastal desert of Chile PABLO AGUSTO1, CAMILO I. MATTONI2, JAIME PIZARRO-ARAYA1, JORGE CEPEDA-PIZARRO1, * & FRANCISCO LÓPEZ-CORTÉS1 1 Departamento de Biología, Facultad de Ciencias, Universidad de La Serena, Casilla 599, La Serena, Chile 2 Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA * e-mail para correspondencia: [email protected] RESUMEN En Chile, el orden Scorpiones está representado por 35 especies, distribuidas en las familias Bothriuridae, Iuridae y Buthidae. La mayoría de ellas son elementos endémicos, adaptados a condiciones xéricas. Nosotros estudiamos la estructura taxonómica de la escorpiofauna asociada a las formaciones vegetacionales presentes en el desierto costero transicional de Chile (25-32º S). Las capturas se realizaron con trampas de intercepción y luz UV. La información de terreno se complementó con antecedentes señalados en la literatura y material de referencia. Identificamos la presencia de nueve especies en un total de 226 especímenes capturados, pertenecientes a las familias Bothriuridae y Iuridae. Los géneros más abundantes de Bothriuridae, representada por ocho especies, fueron Brachistosternus y Bothriurus, con el 55,4 % y el 11 % del total de especímenes capturados, respectivamente. En relación a Brachistosternus, Br. (Leptosternus) roigalsinai fue la especie más abundante, con el 38,9 % del total de los especímenes capturados. Caraboctonus keyserlingi (Iuridae) constituyó el 33,2 % del total. La mayor riqueza de especies de escorpiones, con seis y siete especies, fueron respectivamente, las formaciones vegetacionales del desierto costero de Huasco (27°52’ S, 71°05’ O; 29°24’ S, 71°18’ O) y del matorral estepario costero (29°24’ S, 71°18’ O; 30°34’ S, 71°42’ O). Los desiertos costero de Tal-Tal (23°52’ S, 70°30’ O; 27°51’ S, 71°05’ O) y costero de Huasco presentaron especies exclusivas. El análisis de correspondencia mostró que, para la escorpiofauna estudiada, el matorral estepario costero representaría una zona de transición distribucional. Finalmente, discutimos en función de preferencias de sustrato mostradas por algunas de las especies presentes, algunos aspectos relacionados a la ocupación del hábitat. Palabras clave: Scorpiones, Bothriuridae, Iuridae, desierto costero, zonas áridas, Chile. ABSTRACT In Chile, the order Scorpiones has 35 species, included in the families Bothriuridae, Iuridae, and Buthidae. Most of them are endemic species, well adapted to xeric environments. We studied the taxonomic structure of the scorpiofauna with regards to the plant formations present in the transitional coastal desert of Chile (25-32º S). Captures of scorpions were conducted with pitfall traps and UV light. Data from de field were complemented from literature and reference material. We identified the presence of 9 species in a total of 226 specimens captured, in the families Bothriuridae and Iuridae. The most abundant genera of Bothriuridae, represented by eight species, were Brachistosternus and Bothriurus, with 55.4 % and 11 % respectively of total captured specimens. Regarding Brachistosternus, Br. (Leptosternus) roigalsinai was the most abundant species, with 38.9 % of total captured specimens. Caraboctonus keyserlingi (Iuridae) made the 33.2 % of total captured specimens. The highest species richness of scorpions, with six and seven species were respectively, the plant formations of the coastal desert of Huasco (27°52’ S, 71°05’ W; 29°24’ S, 71°18’ W) and those of the coastal shrubby steppe (29°24’ S, 71°18’ W; 30°34’ S, 71°42’ W). The coastal deserts of Tal-Tal (23°52’ S, 70°30’ W; 27°51’ S, 71°05’ W) and Huasco presented exclusive species. The analysis of correspondence showed that, to the scorpiofauna studied, the coastal shrubby steppe would represent a transitional zone of geographic distribution. Finally, we discussed in function of substrate preference, some aspects related to habitat occupation showed by some of the recorded species. Key words: Scorpiones, Bothriuridae, Iuridae, coastal desert, arid zones, Chile. 01-R.Ch.H. Nat. 79-4-Agusto 407 12/23/06, 9:03 AM 408 AGUSTO ET AL. INTRODUCCIÓN Pocock, 1893, Orobothriurus Maury, 1976, Urophonius Pocock, 1893, Tehuankea Los escorpiones son un pequeño grupo de Cekalovic, 1973, Centromachetes Lönnberg, artrópodos terrestres que tienen hábitos 1897 y Phoniocercus Pocock, 1893, siendo los sigilosos y nocturnos, durante el día se ocultan últimos tres endémicos de Chile (Cekalovic bajo piedras, troncos y grietas o en galerías que 1973, 1983, Acosta 1998, Ojanguren-Affilastro cavan ellos mismos en el sustrato. Tienen una 2005). Iuridae presenta una distribución que actividad estacional marcada; la mayoría de las abarca gran parte de América y Eurasia especies es estival; la mayor parte del tiempo se (Sissom 1990, Sissom & Fet 2000). En Chile encuentran en sus refugios de donde solo salen está representada únicamente por el género para alimentarse y reproducirse (Polis 1990, monoespecífico Caraboctonus Pocock, 1893, Warburg & Polis 1990). Se entiende, en siendo endémico para el desierto costero general, que los escorpiones son animales chileno (Ochoa 2005). La familia Buthidae, por estenoicos y poco móviles (Lourenço 1994a, su parte está representada por Isometrus 2002, Prendini 2001). Por su condición de maculatus (DeGeer, 1778), especie introducida cavadores, muchas especies dependen de la y registrada solo en la Isla de Pascua granulometría y humedad del suelo, factores (Cekalovic 1983), y por Tityus chilensis que a su vez están asociados a diferentes tipos Lourenço, 2005, descrita para el extremo norte de clima y vegetación (Polis 1990, Prendini del país, en la frontera con Bolivia (Lourenço 2001). Estas características han permitido que 2005). los escorpiones se constituyan en modelos El desierto costero transicional de Chile biológicos útiles en el análisis de problemas (25-32º S) representa el límite septentrional del biogeográficos, ecológicos, etológicos y de foco de biodiversidad (hotspots) reconocido conservación (Lourenço 1986, 1991, 1994a, para Chile Central (Cowling et al. 1996, Gaston 1994b, Polis 1990, Peretti 1997, 2001, Prendini 2000); siendo considerado relevante en 2001). términos de diversidad, endemismos e interés El conocimiento de los escorpiones chilenos de conservación biológica para el país es escaso. La mayor parte de la información (Armesto et al. 1993, Gajardo 1994, Muñoz et está referida a aspectos sistemáticos (Lourenço al. 1996, Vidiella et al. 1999, Pizarro-Araya & 2001, Mattoni 2003, Ochoa 2004, 2005) y Jerez 2004, Cepeda-Pizarro et al. 2005a, taxonómicos, incluyendo catálogos de especies 2005b). En un estudio sobre distribución de (Cekalovic 1983, Lowe & Fet 2000), revisiones insectos en el desierto de Atacama, Marquet et de géneros (Cekalovic 1966, San Martín & al. (1998) encontraron que la abundancia y la Cekalovic 1968), redescripciones de especies riqueza de insectos sigue patrones diferentes: (Mattoni 2002a, Mattoni & Acosta 2006) y mientras la abundancia decreció con la altitud, descripciones de otras nuevas (Cekalovic 1968, la riqueza logró su valor máximo a altitudes 1973, 1974a, 1974b, 1975, 1981, Acosta 1998, intermedias, en aparente relación con el patrón Mattoni 2002b, 2002c, Ojanguren-Affilastro de distribución de la vegetación del área de 2002, 2003, 2004, 2005, Lourenço 2005, estudio. En la zona costera, las características Ojanguren-Affilastro & Mattoni 2006). De geomorfológicas (e.g., dunas, cerros, serranías acuerdo a estos antecedentes, la escorpiofauna y quebradas), junto a la acción de las neblinas chilena registra, a la fecha, 35 especies, oceánicas, generan hábitats que permiten la pertenecientes a las familias Bothriuridae existencia de una vegetación que es, en gran Simon, 1880, Iuridae Thorell, 1876 y Buthidae parte, ajena a los efectos de las lluvias Koch, 1837 (Cekalovic 1983, Mattoni 2002b, esporádicas, surgiendo así discontinuidades Ochoa 2004, Lourenço 2005, Ojanguren- locales que interrumpen el gradiente Affilastro 2005, Ojanguren-Affilastro & vegetacional esperado (Rundel et al. 1990, Mattoni 2006). Squeo et al. 1998). En este trabajo postulamos Bothriuridae es predominantemente que la riqueza taxonómica de Scorpiones en el Neotropical y de distribución Gondwánica desierto costero transicional de Chile sigue el (Sissom 1990, Prendini 2003). Está patrón de distribución de la vegetación. Los representada en el país por los géneros: objetivos del trabajo fueron: (1) documentar la Bothriurus Peters, 1861, Brachistosternus composición taxonómica de la escorpiofauna 01-R.Ch.H. Nat. 79-4-Agusto 408 12/23/06, 9:03 AM ESCORPIONES DEL DESIERTO COSTERO CHILENO 409 del desierto costero transicional de Chile y (2) tanto de lluvias ocasionales como de la incursión examinar la presencia latitudinal de las de masas de aire húmedo originadas desde el especies, especialmente en su relación con las Océano Pacífico (Paskoff & Manríquez 2004). formaciones vegetacionales descritas en el área. Esta transecta posee un clima de tendencia mediterránea, con lluvias invernales, de preferencia entre mayo y agosto (Cepeda-Pizarro MATERIALES Y MÉTODOS 1995). De norte a sur existe un gradiente de humedad creciente, con cambios en la cobertura Área de estudio y formaciones
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