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Incluye contenido parcial de los autores Biological invasion is one of the main threats to native biodiversity. For a speciesto become invasive, it must be voluntarily or involuntarily introduced by humans into a nonna-tive habitat. Mammals were among first taxa to be introduced worldwide for game, meat, and labor, yet the number of species introduced in the Neotropics remains unknown. In this dataset, we make available occurrence and abundance data on mammal species that (1) transposeda geographical barrier and (2) were voluntarily or involuntarily introduced by humans into theNeotropics. Our data set is composed of 73,738 historical and current georeferenced recordson alien mammal species of which around 96% correspond to occurrence data on 77 speciesbelonging to eight orders and 26 families. Data cover 26 continental countries in the Neotrop-ics, ranging from Mexico and its frontier regions (southern Florida and coastal-central Floridain the southeast United States) to Argentina, Paraguay, Chile, and Uruguay, and the 13 coun-tries of Caribbean islands. Our data set also includes neotropical species (e.g.,Callithrixsp.,Myocastor coypus,Nasua nasua)considered alien in particular areas of Neotropics. The mostnumerous species in terms of records are fromBossp. (n=37,782),Sus scrofa(n=6,730), andCanis familiaris(n=10,084); 17 species were represented by only one record (e.g., Syncerus caf-fer, Cervus timorensis, Cervus unicolor, Canis latrans). Primates have the highest number of spe-cies in the data set (n=20 species), partly because of uncertainties regarding taxonomicidentification of the generaCallithrix,which includes the speciesCallithrix aurita, Callithrixflaviceps, Callithrix geoffroyi, Callithrix jacchus, Callithrix kuhlii, Callithrix penicillata, andtheir hybrids. This unique data set will be a valuable source of information on invasion riskassessments, biodiversity redistribution and conservation-related research. There are no copy-right restrictions. Please cite this data paper when using the data in publications. We alsorequest that researchers and teachers inform us on how they are using the data

Invasion pathways and invasion-related lags are critical to understand the invasion process and to manage invasive species. The challenge of dealing with introduced populations increases when charismatic species are involved, such as the case of invasive squirrels. In this study, we integrate previous information into a comprehensive description of the invasion process of Callosciurus erythraeus in Argentina, and we synthesise a framework of invasion pathways and associated lag times for introduced squirrel species. One of the main invasion pathways for introduced squirrels involves the trade of pets and ornamental wildlife, i.e. deliberate transportation by humans as vectors using routes of pet/ornamental trade. This was the case of the importation of C. erythraeus into Argentina in 1970 that originated an invasion focus, which firstly spread through squirrels dispersing into nearby habitat (unaided spread). Apart from this local spread, we have recorded a total of 31 translocations within the country of squirrels taken 33−933 km from the source site (aided spread). Most of these translocations-releases occurred close to the invasion foci that functioned as a source of squirrels. Therefore, a key pathway for the invasion of C. erythraeus in Argentina is the illegal and intentional transport of individuals within country boundaries. Time lags can be found throughout the invasion process. We have previously described a lag in population growth and range expansion in the main invasion focus, and also a lag in vector activity (i.e. a lag in the onset of translocations). We now report a lag in the time between the detection by residents of C. erythraeus in a new area and when they report its observation. This time lag shows a decreasing trend, i.e. recent releases are reported sooner, that could respond to a changing lag in the perception of the problem due to communication activities. We propose a general conceptual framework for invasive squirrels that integrates two invasion pathways (A: aided spread that determines the number of invasion foci, and B: unaided spread that determines the size of each invasion focus) and three types of time lags (1: lag in population growth and spread, 2: lag in vector activity, and 3: lag in perception of the problem (human dimension)). Communication and education activities can be a powerful tool to change perceptions and gain support and active engagement of the local community to deal with invasive, charismatic species. Long-term communication programmes should be implemented along with strict and coordinated government policies.

Seed dispersal by exotic mammals exemplifies mutualistic interactions that can modify the habitat by facilitating the establishment of certain species. We examined the potential for endozoochoric dispersal of exotic plants by Callosciurus erythraeus introduced in the Pampas Region of Argentina. We identified and characterized entire and damaged seeds found in squirrel faeces and evaluated the germination capacity and viability of entire seeds in laboratory assays. We collected 120 samples of squirrel faeces that contained 883 pellets in seasonal surveys conducted between July 2011 and June 2012 at 3 study sites within the main invasion focus of C. erythraeus in Argentina. We found 226 entire seeds in 21% of the samples belonging to 4 species of exotic trees and shrubs. Germination in laboratory assays was recorded for Morus alba and Casuarina sp.; however, germination percentage and rate was higher for seeds obtained from the fruits than for seeds obtained from the faeces. The largest size of entire seeds found in the faeces was 4.2×4.0mm, whereas the damaged seeds had at least 1 dimension ≥ 4.7mm. Our results indicated that C. erythraeus can disperse viable seeds of at least 2 species of exotic trees. C. erythraeus predated seeds of other naturalized species in the region. The morphometric description suggested a restriction on the maximum size for the passage of entire seeds through the digestive tract of squirrels, which provides useful information to predict its role as a potential disperser or predator of other species in other invaded communities. Fil: Bobadilla, Sabrina Yasmin. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Benitez, Verónica Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina

Arboreal squirrels of the Asiatic genus Callosciurus have shown high likelihood of establishment from few released animals, in particular, C. erythraeus has established wild populations in Argentina, Belgium, France, Hong Kong, Japan, and The Netherlands. We report the invasion process of C. erythraeus in Argentina in the last four decades and suggest management actions for each foci. Between February 2011 and November 2014 we conducted field surveys and interviews in nine sites in central Argentina to confirm the presence of C. erythraeus, describe their history of introduction, and estimate range expansion and squirrel relative abundance. We report a two decades lag-phase until the onset of translocations of C. erythraeus within national boundaries that resulted in a constant increase of the cumulative number of releases. We confirm nine new release events between 1995 and 2012 and six new invasion foci that yields a total of 13 deliberate releases and 10 invasion foci established in rural and urban areas of Argentina. Spread rate ranged from 0.12 to 0.66 km/year. An intermediate relative density of squirrels (2–7 ind/ha) was found close to release sites except in one case. All introduction events involved squirrels translocated from the first, 40 years old invasion focus, occasionally involving illegal trade. The rate of introduction events in the last decades and the translocation-lag phase described in this study should call the attention in all countries dealing with charismatic, introduced species. Translocation disruption requires urgent attention to slow down the invasion of this and other species. Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Benitez, Verónica Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Gozzi, Ana Cecilia. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Hertzriken, Marina. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina Fil: Borgnia, Mariela. Universidad Nacional de Luján. Instituto de Ecología y Desarrollo Sustentable. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Ecología y Desarrollo Sustentable; Argentina

Squirrels have been traded in the pet market for several decades, and numerous species have established in the wild. The Asiatic species Callosciurus erythraeus and Callosciurus finlaysonii have been introduced into other parts of Asia, in Europe and South America. In this study, (1) we conducted a genetic characterization of C. erythraeus introduced into Argentina and compared them with native and introduced populations in Asia, and (2) we analyzed genetic variation among the four invasion foci in Argentina in order to corroborate that the pathway of invasion was a single introduction event in the country and subsequent translocations. We analyzed mitochondrial (cytochrome b, Cyt b; cytochrome oxidase c subunit I, COI and D-loop) and nuclear (recombination activating gene I, RAGI) DNA markers using the classical method (DNA barcoding gap analysis) and also the Automatic Barcode Gap Discovery method (ABGD). The markers D-loop, COI, and RAG1 indicated that the introduced squirrels from the different invasion foci formed a monophyletic group that, together with only one haplotype for the D-loop and COI markers, supported the hypothesis of one introduction event into Argentina followed by subsequent translocations. Unexpectedly, sequences from squirrels captured in Argentina were more related to C. finlaysonii than to C. erythraeus for D-loop and Cyt b markers. However, intraspecific variation among sequences of C. erythraeus belonging to different subspecies or collected in different regions was large and comparable with the distance to the sequences from Argentina. The ABGD method also indicated large genetic variability within C. erythraeus and close proximity between squirrels from Argentina and C. finlaysonii. The complex taxonomy of Callosciurus, as occurs with the sister species C. erythraeus and C. finlaysonii, requires a thorough systematic revision. A simultaneous analysis of diagnostic morphological characters and genetic markers is needed and will provide new insight regarding the worldwide invasion of Asiatic squirrels., Centro Regional de Estudios Genómicos

We isolated Leptospira strains from renal tissue samples of Asiatic red-bellied squirrels Callosciurus erythraeus, captured in Argentina. In December 2008, we captured 34 squirrels in the province of Santa Fe during a short control campaign, which were screened for Leptospira spp. by direct immunofluorescence assays and isolation attempts in renal tissue samples. A prevalence of 38% of Leptospira spp. was obtained by direct immunofluorescence. The isolates, genotyped by the MLVA, were identified as L. interrogans Canicola (N = 2) and L. interrogans Icterohaemorraghiae (N = 1), showing an identical genetic profile to the reference strains Hond Utrech IV (serovar Canicola, serogroup Canicola) and M20 (serovar Copenhageni, serogroup Icterohaemorrhagiae), respectively. Our study shows for the first time that the red-bellied squirrel is a renal carrier of Leptospira interrogans and might act as a reservoir of leptospirosis both in native range and areas of introduction within several European countries, Japan and Argentina. The close association of this introduced squirrel species with humans and domestic animals may increase the probability of disease transmission, particularly in favourable environments. Fil: Gozzi, Ana Cecilia. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Guichon, Maria Laura. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentina Fil: Benitez, Verónica Victoria. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Romero, Graciela Noemi. Instituto Nacional de Tecnologia Agropecuaria. Centro Nacional de Investigaciones Agropecuarias. Centro de Investigación de Ciencias Veterinarias y Agronomicas; Argentina Fil: Auteri, Carmelo. Instituto Nacional de Tecnologia Agropecuaria. Centro Nacional de Investigaciones Agropecuarias. Centro de Investigación de Ciencias Veterinarias y Agronomicas; Argentina Fil: Brihuega, Bibiana. Instituto Nacional de Tecnologia Agropecuaria. Centro Nacional de Investigaciones Agropecuarias. Centro de Investigación de Ciencias Veterinarias y Agronomicas; Argentina

The only known introduction of a squirrel species into South America is the case of the Asiatic red-bellied tree squirrel Callosciurus erythraeus that was introduced in the Pampas Region of Argentina in 1970. To inform management programmes, we analysed the current distribution, expansion rate, and abundance of the red-bellied squirrel in Argentina, and identified invasion pathways. Apart from the first and main focus of invasion, three other invasion foci have originated as a consequence of intentional releases between 1995 and 2000. The main invasion focus already extends over >1300km2, where estimated density averaged 15indha-1 and numbers of squirrels may reach 100,000 individuals. The area invaded in the other three invasion foci varied between

Dispersal is a key element of the invasion process for introduced species, and is influenced by landscape connectivity. The red-bellied squirrel (Callosciurus erythraeus) was introduced to Argentina in 1970. Suitable forest habitat for this arboreal species is highly fragmented in a rural-urban matrix, but despite this, the squirrel population has spread. Squirrels disperse into new habitat patches using connective features such as forest corridors. They may also cross gaps but up to what extent is not known. Gap crossing success is influenced by perceptual range, which is the distance from which animals can perceive suitable habitat. Perceptual range has been previously estimated for vulnerable species, but not for introduced species. We used a model relating perceptual range to body mass to predict the perceptual range of the red-bellied tree squirrel in Argentina. We then tested our prediction of 202-221 m by releasing squirrels in an unfamiliar arable field at different distances (300, 200, 100 and 20 m) from woodland habitat. We assumed that if woodland could be perceived, squirrels would orientate toward it. We estimated perceptual range to be between 20 and 100 m, considerably lower than predicted. Our results indicate that squirrels can potentially cross small habitat gaps, but dispersal over greater distances lacking connectivity is less likely. Incorporating this information when modelling the spread of exotic squirrels in the Pampas Region can yield more accurate prediction of the invasion process and guide management practices to minimise their expansion. © 2012 Springer Science+Business Media B.V. Fil: Bridgman, Lucy J.. The University of Waikato; Nueva Zelanda Fil: Benitez, Verónica Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Graña Grilli, Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Mufato, Natalia. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Acosta, Daniela. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina Fil: Guichon, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Básicas; Argentina

El estudio y manejo de especies exóticas invasoras ha estado principalmente enfocado en conocer el proceso de invasión y técnicas adecuadas de manejo. Sin embargo, en los últimos años los estudios que promueven la participación de diferentes grupos sociales de la comunidad en los planes de manejo han cobrado importancia. En este trabajo describimos las opiniones y actitudes predominantes de seis grupos sociales (productores y prestadores de servicios, ambientalistas, vecinos, personal de áreas protegidas, funcionarios y docentes) con respecto a la presencia de la ardilla de vientre rojo introducida en Argentina. La existencia de varios focos de invasión de ardillas en tres provincias argentinas se relaciona con liberaciones intencionales de ardillas, en ocasiones obtenidas por comercio ilegal. Las opiniones con respecto a la presencia de ardillas variaron desde una percepción negativa que consideraba que era una especie problema que debía ser controlada hasta una percepción positiva que sostiene que es una especie atractiva y vistosa. Algunos grupos mostraron una opinión predominante, mientras que otros reflejaron todo el rango de respuestas. La experiencia directa con la especie, sus atributos y el tiempo desde su introducción, el área de residencia y el grado de conocimiento sobre la problemática influyen sobre las opiniones y actitudes de las personas. Las alternativas de manejo deben planificarse para cada zona invadida teniendo en cuenta las particularidades no sólo biológicas y económicas, sino también sociales y políticas. Al mismo tiempo, resulta imprescindible una estrategia nacional de prevención para frenar la aparición de nuevos focos de invasión. Para esto es fundamental desarrollar estrategias que reorienten la relación de las personas con los recursos del ambiente y promuevan la valoración de los ecosistemas locales y especies nativas, así como la co-responsabilidad y la participación ciudadana en la problemática de las invasiones biológicas, el tráfico de fauna y la tenencia de mascotas. The study and management of exotic invasive species has been mainly focused on understanding the invasion process and designing adequate management techniques; however, in recent years several studies have shown the importance of involving social groups of the local community in the implementation of management plans. In this study we describe opinions and attitudes of six social groups (producers and service providers, environmentalists, neighbours, personnel of protected areas, civil servants, and teachers) regarding the presence of the red-bellied squirrels introduced in Argentina. The occurrence of various invasion foci of squirrels in three Argentinian provinces results from intentional releases of individuals, sometimes obtained by illegal trade. Opinion towards the presence of squirrels ranged from a negative perception of the squirrels viewed as a problem species that needs to be controlled to a positive perception of the squirrels viewed as an attractive species. Some groups showed a predominant opinion while others reflected the whole range of responses. Personal experience with the species, its attributes and the time since its introduction, the area of residency, and the knowledge of the problems posed by this species affect the opinion and attitudes towards the presence of red-bellied squirrels. Management plans must be designed for each invasion focus not only considering biological and economic issues, but also social and political ones. At the same time, a national strategy of prevention to stop the creation of new invasion foci is urgently needed. We therefore need strategies to reorient the relationship between people and environmental resources and to promote appreciation of local ecosystems and native species as much as co-responsibility and citizen participation in the problems posed by biological invasions, and the illegal trade of wild fauna and pets.

The introduction of an exotic species usually modifies parasite-host dynamics by the import of new parasites or the exotic species' acquiral of local parasites. The loss of parasites may determine the outcome of an invasion if the introduced species is liberated from co-evolved parasites in its range of invasion. In addition, an introduced species may pose sanitary risks to humans and other mammals if it serves as a reservoir of pathogens or carries arthropod vectors. The red-bellied squirrel, Callosciurus erythraeus (Pallas) (Rodentia: Sciuridae), was introduced into Argentina in 1970, since when several foci of invasion have been closely associated with humans. Investigation of the parasitological fauna of C. erythraeus in Argentina will generate new information about novel parasite-host dynamics and may provide new insight into the reasons for the successful invasion of this species. The objective of this study was to describe the arthropod parasites of C. erythraeus in Argentina in comparison with previous studies of parasites of this species in its native habitat and in the ranges of its invasion. Occasional host-parasite associations with local arthropod parasites not previously described for C. erythraeus are reported; these include the mites Androlaelaps fahrenholzi (Ewing) (Mesostigmata: Laelapidae) and Ornithonyssus cf. bacoti (Mesostigmata: Macronyssidae), the flea Polygenis (Polygenis) rimatus Jordan (Siphonaptera: Rhopalopsyllidae) and the botfly Cuterebra Clark (Diptera: Oestridae: Cuterebrinae). Cheyletus sp. mites (Trombidiformes: Cheyletidae) were also found. The low prevalence and mean intensity of ectoparasite species may influence invasion dynamics.