Instituto Internacional en Conservación y Manejo de Vida Silvestre

URI permanente para esta comunidadhttp://10.0.96.45:4000/handle/11056/14849

El Instituto Internacional de Conservación y Manejo de Vida Silvestre (ICOMVIS)genera y transfiere conocimiento y forma recurso humano mediante la investigación, educación y extensión en el campo de la conservación y manejo de vida silvestre y su relación con el ser humano en el Neotrópico, a través de acciones inter y multidisciplinarias que integran aspectos teóricos y prácticos para la conservación de la vida silvestre.

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20 años de monitoreo de cinco especies indicadoras de la salud del Bosque en el Parque Nacional Corcovado, Costa Rica
(2013-08-22) Eduardo Carrillo; Joel Sáenz
Costa Rica es uno de los países más avanzados en América Latina en cuanto a la protección de áreas silvestres y sus recursos naturales. Sin embargo, los datos acerca de si la mayoría de las áreas boscosas costarricenses cumplen con los requisitos mínimos para mantener especies silvestres que requieren áreas extensas para sobrevivir son escasos. Los grandes felinos, como el jaguar y el puma (Puma concolor), sus presas, entre ellas, el chanco de monte (Tayassu pecari), la danta (Tapirus bairdii) y el cabro de monte (Mazama americana) están muy relacionados a los bosques primarios y han desaparecido en la mayor parte del país debido, principalmente, a la destrucción de hábitat y a la presión de cacería. Estas especies pueden ser utilizadas como especies indicadoras para estimar la salud del ecosistema y ayudar a definir rutas de comunicación y límites de corredores biológicos, por ejemplo. Este informe presenta los resultados de los últimos 20 años de monitoreo de cinco especies de mamíferos grandes y medianos en el Parque Nacional Corcovado, PNC. Las especies incluidas en este informe son: el jaguar, el puma, el chancho de monte, el saíno y la danta.
A comparison of fruit removal in Ficus colubrinae between birds and Ectophylla alba (Chiroptera: Phyllostomidae) in a Costa Rican rain forest
(Taylor and Francis Ltd., 2021-02-02) De la Llata Quiroga, Edna; Ruedas, Luis; Mora, José Manuel
Ectophylla alba almost exclusively feeds on the fruits of Ficus colubrinae therefore significantly contributing to dispersal of its seeds. The objective of this research was to quantify the fruit removal of F. colubrinae by E. alba and compare it with that of birds in a F. colubrinae tree at the La Selva Biological Station, Costa Rica. We established seven quadrats randomly at different heights of the tree. We took photographs of each quadrat, quantified the fruits in each photograph, and compared the number of fruits removed during periods of high and low activity. The on-site persistence time of birds (9:05 min) was higher than that of E. alba (0.32 s). Birds removed more fruits (46) than E. alba (41). Birds defecated on site more times (13.08 feces per day) than E. alba (7.5 feces per day). Thus, E. alba is a more important seed disperser of F. colubrinae than are birds, because it persisted a short time at the feeding site, and consumed food beyond the individual trees’ canopies. Most importantly, by defecating during flight or away from the fruiting tree, E. alba disperse seeds some distance from the F. colubrinae tree, thereby contributes more effectively toward seed dispersal.
A new nesting record for the jabiru in Costa Rica
(Waterbird Society, 1998) Villarreal Orias, Johnny
I document the first nesting record of theJabiru (Jabiru mycteria) in "Los Guatuzos" forest floodplain, Alajuela province, Costa Rica. The active nest was located in March 1995 at 10°49'23.70"N and 84°47'23.20"W. The nest was 16m high in a 23m high silk-cotton tree (Ceiba pentandra) and contained three chicks. The zone is not protected and active lumbering is underway.
A Sensitivity Analysis of the Application of Integrated Species Distribution Models to Mobile Species: A Case Study with the Endangered Baird's Tapir
(Cambridge University Press, 2019-04-21) Schank, Cody J; Cove, Michael V; Kelly, Marcella J; Nielsen, Clayton K; Farrill, Georgina O; Meyer, Ninon; Jordan, Christopher A; González-Maya, Jose F; Lizcano, Diego J; Moreno, Ricardo; Dobbins, Michael; Montalvo Guadamuz, Víctor Hugo; Cruz Díaz, Juan Carlos; Pozo, Gilberto; de la Torre, J. Antonio; Brenes Mora, Esteban; Wood, Margot A; Gilbert, Jessica; Jetz, Walter; Miller A, Jennifer
Species distribution models (SDMs) are statistical tools used to develop continuous predictions of species occurrence. 'Integrated SDMs' (ISDMs) are an elaboration of this approach with potential advantages that allow for the dual use of opportunistically collected presence-only data and site-occupancy data from planned surveys. These models also account for survey bias and imperfect detection through the use of a hierarchical modelling framework that separately estimates the species-environment response and detection process. This is particularly helpful for conservation applications and predictions for rare species, where data are often limited and prediction errors may have significant management consequences. Despite this potential importance, ISDMs remain largely untested under a variety of scenarios. We performed an exploration of key modelling decisions and assumptions on an ISDM using the endangered Baird's tapir (Tapirus bairdii) as a test species. We found that site area had the strongest effect on the magnitude of population estimates and underlying intensity surface and was driven by estimates of model intercepts. Selecting a site area that accounted for the individual movements of the species within an average home range led to population estimates that coincided with expert estimates. ISDMs that do not account for the individual movements of species will likely lead to less accurate estimates of species intensity (number of individuals per unit area) and thus overall population estimates. This bias could be severe and highly detrimental to conservation actions if uninformed ISDMs are used to estimate global populations of threatened and data-deficient species, particularly those that lack natural history and movement information. However, the ISDM was consistently the most accurate model compared to other approaches, which demonstrates the importance of this new modelling framework and the ability to combine opportunistic data with systematic survey data. Thus, we recommend researchers use ISDMs with conservative movement information when estimating population sizes of rare and data-deficient species. ISDMs could be improved by using a similar parameterization to spatial capture-recapture models that explicitly incorporate animal movement as a model parameter, which would further remove the need for spatial subsampling prior to implementation. © 2019 Foundation for Environmental Conservation.
Abundance, habitat and body measurements of the rare Long-clawed Mouse (Pearsonomys annectens) in the coastal temperate rainforest of southern Chile
(Studies on Neotropical Fauna and Environment, 2012) Cádiz, Rodrigo; Figueroa R., Ricardo A.; Figueroa, Rodolfo; Soraya, Corales E.; Murúa, Roberto
Based on rodent trappings in eight localities from 1998 to 2005 (14,984 trap-nights), we provide detailed information on abundance, habitat and additional body measurements of the Long-clawed Mouse (Pearsonomys annectens), a rare rodent in the Valdivian temperate rainforest. The Long-clawed Mouse was collected in three localities only in both highly fragmented and continuous forests, including forestry plantations. The sites had relatively mature and closed vegetation and deep soils covered with leaf litter. Males appeared to be larger and heavier than females. Sexually active individuals were found in spring. We conclude that small and geographically restricted populations, low population densities, microhabitat specialization, and dependence on southern temperate forest make long-clawed mice vulnerable to the disappearance of the forest.
Abundancia del jaguar (Panthera onca), otros felinos y sus presas potenciales en el Parque Nacional Santa Rosa, Costa Rica / Abundance of jaguars (Panthera onca), other felids and their potential prey in Santa Rosa National Park, Costa Rica
(Universidad Estatal a Distancia, Costa Rica, 2015) Montalvo Guadamuz, Victor; Sáenz Bolaños, Carolina; Ramírez Carvajal, Shirley; Carrillo Jiménez, Eduardo
Abundance of jaguars (Panthera onca), other felids and their potential prey in Santa Rosa National Park, Costa Rica. Santa Rosa National Park, Guanacaste Province, protects one of the largest remnants of dry forest in Mesoamerica. It is considered an example of how to regenerate forest in an area that for many years was used for cattle. A proper management requires knowledge of trends in mammal populations. We chose species that demand high ecologic integrity. the jaguar (Panthera onca ) and other felines, and their potential prey. Using trace count we assessed abundance on seven trails systematically sampled in 2001 and later in 2011. In 2011 we found more traces of jaguars, less of cougars and the same number for ocelots. In the second sampling we found less herbivores and frugivores, and more omnivores. We believe that the trace method is reliable, rapid and cheap.
Abundancia, tamaño y estructura poblacional del tiburón punta blanca de arrecife, Triaenodon obesus (Carcharhiniformes: Carcharhinidae), en Bahía Chatham, Parque Nacional Isla del Coco, Costa Rica
(Universidad de Costa Rica, 2012) Zanella, Ilena; López Garro, Andrés; Golfín Duarte, Geiner; Sáenz, Joel
Approximately 12 species of shark inhabit at Coco Island National Park (PNIC); some are migratory, such as the hammerhead shark (Sphyrna lewini) and whale shark (Rincodon typus), and others are resident, like the whitetip shark (Triaenodon obesus). The whitetip shark is a species related to coral reefs, it inhabits coastal environments and is nocturnal and, it is very common in tropical waters, but there are few studies worldwide. In fact, only short researches have been done about their behavior at PNIC. Therefore, this study aimed to give data about the abundance, size and population structure of the whitetip shark at Chatham Bay in Coco Island National Park, providing baseline information for monitoring its population which is also very vulnerable to climate change. In order to accomplish this aim, a mark-recapture method was used, as well as underwater visual counts to determine their relative abundance and visual recaptures at Chatham Bay. The most effective hours for tagging were between 18:00 and 22:00 (sunset), when the whitetip sharks were more active probably related to foraging behavior. In addition, the depth was a relevant factor for tagging, sharks were caught in shallow water (10.9±1.9m). This species prefers to feed in shallow water and this behavior is probably related to the distribution and occurrence of rock and coral reefs in Chatham Bay. Based on the results, whitetip shark do not have a defined spatial ontogenic segregation, since in the same sites both juveniles and adults were found. The study confirmed that whitetip shark use specific residence sites: during the tagging trips, different individuals were recaptured; and during the underwater counts, at least 32.76% of tagged sharks were observed. The average length of the tagged sharks was 101.8±12.1cm (130.0cm maximum and 71.0cm minimum). The relative abundance of the whitetip shark in Chatham Bay observed was estimated on 49.5±10.4 sharks/hour. Furthermore, using the recapture data obtained during the night tagging expeditions, a population of 408 (IC = 181-1050) sharks was estimated.
Adaptación de indicadores de turismo sostenible: implementación en Chiapas, México
(Universidad de Costa Rica, Costa Rica, 2020-09-25) Rioja Paradela, Tamara; Camacho Ruiz, Edali; Carrillo Reyes, Arturo; Espinoza Medinilla, Eduardo; Porras Murillo, Laura
Este estudio adapta y propone una serie de indicadores de turismo sostenible, así como un índice de sostenibilidad turística. Se aplicaron indicadores cuantitativos y cualitativos en un centro turístico de Chiapas, México. De manera relevante se identifican los aspectos críticos que deben abordarse para incrementar la sostenibilidad, y se detalla indicadores que pueden ser utilizados por los administradores del sitio y otros proyectos turísticos similares
Age variation in the body coloration of the orb-weaver spider Alpaida tuonabo and its implications on foraging
(Nature Publishing Group, 2018-02-26) Gálvez, Dumas; Añino, Yostin; De La O, Jorge M
Spiders show a repertoire of strategies to increase their foraging success. In particular, some orb-weaver spiders use attractive body colorations to lure prey. Interestingly, coloration varies with age in many species, which may result in ontogenetic variation of foraging success. By using field observations, laboratory experiments and spectrophotometric analysis, we investigated whether pale juveniles and bright adults of the orb-weaver Alpaida tuonabo use different foraging strategies due to ontogenetic variation in coloration. Field observations revealed that foraging success of juveniles and adults was influenced by web properties. However, foraging success increased with body size only in adults, supporting the idea that larger individuals produce a stronger visual signal for prey. The attractiveness of the adult coloration for prey was confirmed in the laboratory with frame-web-choice experiments, in which webs bearing a spider intercepted more bees than empty webs. Our spectrophotometric analysis suggests that the yellow coloration may produce the deceiving signal for prey. Moreover, we identified potential alternative foraging strategies: cryptic juveniles at higher heights and ‘attractive’ adults at lower heights. This study reveals how ontogenetic colour variation may favour the use of alternative foraging strategies in orb-weaver spiders and reduces intraspecific competition.
Agentes infecciosos en el zorro cangrejero (cerdocyon thous) en las áreas protegidas urbanas del Valle de Aburrá, Colombia
(Universidad Nacional, Costa Rica, 2021) Muñoz Mazo, Sara Salomé; Spínola Parrallada, Romeo Manuel
La detección de agentes infecciosos en animales de fauna silvestre en entornos urbanos es fundamental para su conservación y manejo. Dependiendo del tipo de agente infeccioso que los afecte, las implicaciones son relevantes tanto para su especie como para su entorno. El objetivo de este estudio fue identificar los agentes infecciosos en el zorro cangrejero (Cerdocyon thous) en las Áreas Protegidas Urbanas del Valle de Aburrá APU, Colombia. Se analizó la información obtenida de 24 zorros en las 6 Áreas Urbanas Protegidas APU y sus áreas de amortiguamiento. Entre febrero de 2020 y enero de 2021, se realizaron exámenes clínicos, se recolectaron muestras sanguíneas, materia fecal, orina y necropsias. Se recolectó la muestra fecal de 9 individuos, resultando 1 individuo positivo para huevos de Estrongilidos. En los resultados del laboratorio clínico (Hemogramas, citoquímico de orina, químicas sanguíneas) al no tener valores de referencia de la especie en el país, no es posible realizar una comparación de los valores obtenidos con los de referencia. Para la familia Anaplasmatacea, registré 3 (19%) resultados positivos en 16 muestras, 2 para Ehrlichia spp y 1 para Anaplasma spp. Para el agente Leptospira spp se procesaron 19 muestras con un resultado de 4 ejemplares positivos (21,05%). Los resultados encontrados son de importancia científica al ser el primer reporte de Leptospira interrogans por técnicas moleculares de análisis PCR en Colombia, la presencia de estos agentes infecciosos, indica la circulación de patógenos de importancia mundial por sus implicaciones en la salud pública, siendo un valioso aporte para las APU, llenando vacíos de información sobre el mamífero de mayor tamaño que las habitan y de esta manera poder adoptar medidas de manejo para su conservación.
Agroforestry systems conserve species-rich but modified assemblages of tropical birds and bats
(Springer, 2007-05-31) Harvey, Celia; González Villalobos, Jorge
Although an increasing number of studies have shown that diverse, multi-strata agroforestry systems can contribute to the conservation of tropical biodiversity, there is still debate about how the biodiversity within agroforestry systems compares to that of intact forest and alternative land uses. In order to assess the relative importance of agroforestry systems for biodiversity conservation, we characterized bat and bird assemblages occurring in forests, two types of agroforestry systems (cacao and banana) and plantain monocultures in the indigenous reserves of Talamanca, Costa Rica. A total of 2,678 bats of 45 species were captured, and 3,056 birds of 224 species were observed. Agroforestry systems maintained bat assemblages that were as (or more) species-rich, abundant and diverse as forests, had the same basic suite of dominant species, but contained more nectarivorous bats than forests. Agroforestry systems also contained bird assemblages that were as abundant, species-rich and diverse as forests; however the species composition of these assemblages was highly modified, with fewer forest dependent species, more open area species and different dominant species. The plantain monocultures had highly modified and depauperate assemblages of both birds and bats. Across land uses, bird diversity and species richness were more closely correlated with the structural and floristic characteristics than were bats, suggesting potential taxon-specific responses to different land uses. Our results indicate that diverse cacao and banana agroforestry systems contribute to conservation efforts by serving as habitats to high numbers of bird and bat species, including some, but not all, forest-dependent species and species of known conservation concern. However, because the animal assemblages in agroforestry systems differ from those in forests, the maintenance of forests within the agricultural landscape is critical for conserving intact assemblages at the landscape level.
Altitudinal and seasonal distribution of butterflies (Lepidoptera, papilionoidea) in cerro bufa el diente, Tamaulipas, Mexico
(Pensoft Publishers, 2019-12-31) Meléndez-Jaramillo, Edmar; Cantú Ayala, César; Sánchez-Reyes, Uriel Jeshua; Sandoval-Becerra, Fatima Magdalena; Herrera-Fernández, Bernal
Butterflies are one of the most recognized and useful groups for the monitoring and establishment of important conservation areas and management policies. In the present study, we estimate the richness and diversity, as well as the association value of submontane scrub, oak forest, and cloud forest species at Cerro Bufa El Diente, within the Sierra de San Carlos priority land region, located in the Central-western region of Tamaulipas, Mexico. Three sampling sites were established based on criteria of vegetation distribution per altitudinal floor. One site for each altitudinal floor and vegetation type. Sampling was carried out in permanent transects on a monthly basis at each site, using an aerial entomological net and ten Van Someren-Rydon traps, during four sampling periods: early dry season, late dry season, early wet season and late wet season. In total, 7,611 specimens belonging to six families, 20 subfamilies, 32 tribes, 148 genera and 243 species of the study area were collected. Nymphalidae was the most abundant family with 3,454 specimens, representing 45.38% of total abundance in the study area. Lower abundance was recorded in Hesperiidae (19.17%), Pieridae (16.41%), Lycaenidae (10.17%), Papilionidae (5.12%), and finally Riodinidae (3.74%). The highest species richness was presented in the family Hesperiidae with 34.57% of the total obtained species followed by Nymphalidae (30.45%), Lycaenidae (15.23%), Pieridae (9.88%), Papilionidae (5.76%), and Riodinidae (4.12%). Twenty-seven species were categorized as abundant, these species, Anaea aidea (Guérin-Méneville, 1844), Libytheana carinenta larvata (Strecker, 1878), Pyrgus oileus (Linnaeus, 1767), Mestra amymone (Ménétriés, 1857) and Phoebis agarithe agarithe (Boisduval, 1836) presented the highest number of specimens. Sixty-five species were considered common, constituting 41.73% of the total number of butterflies, 63 frequent (9.76% of the total abundance), 55 limited (2.54%) and 33 rare (0.43%). The greatest number of specimens and species, as well as alpha diversity, were presented on the lowest altitudinal floor, made up of submontane scrub, and decreased significantly with increasing altitude. According to the cluster analysis, low and intermediate altitude sites constitute an area of distribution of species that prefer tropical conditions, while the third-floor site forms an independent group of high mountain species. The greatest abundance and richness of species, as well as alpha diversity, was obtained during the last wet season, decreasing significantly towards the early dry season. Moreover, through the use of the association value, 19 species were designated as indicators, three for the last altitudinal floor, three for the intermediate and 13 for the first. The present work represents the first report of the altitudinal variation in richness, abundance and diversity of butterflies in the northeast of Mexico. These results highlight the importance of the conservation of this heterogeneous habitat and establish reference data for the diurnal Lepidoptera fauna of the region. © E. Meléndez-Jaramillo et al.
Ámbito de acción, uso del hábitat y actividad diaria de la taltuza Orthogeomys heterodus (Rodentia: Geomyidae) en una zona hortícola de Costa Rica.
(Universidad Nacional, Costa Rica., 1994) Bonillo, Never
Home range, daily activity and habitat use of four Giant Pocket Gophers Orthogeomys heterodus were detennined by radiotelemetry. The study was carried out in a horticultural area of Cartago province, Costa Rica, during December 1989 and January 1990. Home range averaged 325 m2 for males and 233 m2 for females. There was a significant relationship between home range size and individual body mass. In average, 78 % of localizations were in the nest or refuge located in all cases in the border of crops. Activity was greatest from 0600 to 0800 h and 1200 to 1400 h, and was reduced at night.
Ambito de hogar y utilización de hábitat de dos grupos de venados Cola Blanca Odocoileus virginianus (Artiodactyla: Cervidae) reubicados en un ambiente tropical
(Universidad Nacional, Costa Rica, 1998) Vaughan Dickhaut, Christopher; Sáenz Méndez, Joel
Ocho venados cola blanca fueron liberados en la finca La Emilia, Guanácaste, Costa Rica, durante noviembre de 1987 y marzo de 1988. Cuatro hembras procedían de una población insular (Isla San Lucas, ISL) y habían sido criadas en cautividad hasta los 9 meses de edad cuando fueron liberadas. Los cuatro restantes eran adultos. Tres hembras y un macho del Parque Nacional de Palo Verde (PV). Todos los ciervos fueron marcados con collares de radiotelemetría y seguidos durante un periodo de 13 meses. Los cuatro ciervos de ISL también fueron observados directamente durante 8 meses. Se determinó y comparó el área de campeo y el uso del hábitat de cada grupo. El área de campeo media diaria fue de 18,3 ha para el grupo ISL y de 18,4 ha para el grupo PV; las diferencias entre estos valores no fueron significativas (Análisis de Varianza, ANOVA, P> .05). Las áreas de campeo de ambos grupos no fueron significativamente diferentes entre estaciones; sin embargo, el grupo ISL sí mostró una diferencia significativa entre ambas estaciones (ANOVA, P<0,05). El grupo ISL utilizó ocho tipos de hábitat de los 14 disponibles, mientras que el grupo PV utilizó 11 tipos de hábitat; se encontraron diferencias en las preferencias de hábitat entre ambos grupos (Xl P< .(01). La utilización del hábitat fue significativamente diferente entre los dos grupos tanto en la estación seca como en la húmeda (Xl, P< ,001). Los hábitats más utilizados (confianza intervais de Bonferroni) del grupo ISL fueron pastizales, plantaciones forestales (Pithecelobium saman), terrenos cliltivados (sorgo y frutales) y vegetación ribereña. El grupo PV utilizó hábitats con cierta cobertura forestal, chaparral, jaraguales y guacimales (Guazuma ulmifolia).
Análisis de variabilidad y diferenciación genética poblacional de la lapa verde (ara ambiguus) en Costa Rica
(Universidad Nacional (Costa Rica). Instituto Internacional en Conservación y Manejo de Vida Silvestre. Maestría en Conservación y Manejo de Vida Silvestre, 2018) Ramírez Molina, Hersson Alonso
Analiza los niveles de variabilidad y diferenciación genética poblacional de la lapa verde. Evalúa el grado de parentesco, se buscan indicios de endogamia y de un evento reciente de cuello de botella genético. Se extrae ADN de plumas y heces colectadas de manera no invasiva en seis localidades dentro del área de distribución de la lapa verde en Costa Rica. Formato adicional Disponible también en disco compacto.
Análisis del paisaje sonoro en plantaciones de café de sombra con tres categorías de manejo en Guatemala
(Universidad Nacional (Costa Rica). Instituto Internacional en Conservación y Manejo de Vida Silvestre. Maestría en Conservación y Manejo de Vida Silvestre, 2018) Sagastume Pinto, Karla Varinia
Compara el paisaje sonoro de plantaciones de café de sombra con tres categorías de manejo (monocultivo, policultivo comercial y sistema tradicional) en dos departamentos de Guatemala, Quetzaltenango y Santa Rosa. Asimismo, se evaluó la relación entre el paisaje sonoro y la estructura de la vegetación. Se realizaron grabaciones de paisaje sonoro entre julio y septiembre del 2017, de 0600 a 0900 horas, en cuatro plantaciones de café de sombra con 15 grabadoras de bajo costo (LCRs).
Analysis of the Interactions Between Humans and Crocodiles in Costa Rica
(Sociedade Brasileira de Herpetologia, 2020) Porras Murillo, Laura Patricia; Mata Cambronero, Erick
The habitat of crocodiles (Crocodylus acutus) and caimans (Caiman crocodilus) has been subjected to pressure due to human expansion. Habitat reduction, coupled with the simultaneous growth of the crocodile population, increases the number of interactions between crocodiles and humans. There is currently no official and systematized interactions database, but it is necessary to know the magnitude and nature of the interactions and establish management measures. The objective of the work was to systematize and evaluate the interactions between crocodiles and humans in Costa Rica. Historical information was collected from several sources. A total of 99 records, dated between 1990–2017, were found from press reports and the Integrated System for Processing Environmental Complaints of the Ministry of Environment and Energy (SITADA). The Fire Department recorded 123 events in 2017. All Fire Department records corresponded to encounters or sightings. Of the SITADA incident records, 35.4% were non-fatal, 27.3% were fatal, 21.2% were encounters and sightings, and the remaining 16.1% were miscellaneous situations. Most interactions occurred during the day, a fact potentially explained by human behavior of being in bodies of water or on adjacent shoreline while the sun is out. Most interactions occurred in the Central Pacific, followed by the Caribbean and then the South Pacific. The information available is brief but allows to establish management measures. The country needs to create a national database of interactions and to encourage individuals to report their interactions. Further research should continue to analyze the data for trends with the goal of building recommendations to prevent an increase in negative interactions.
Anthropization in buffer zones of protected areas
(Elsevier B.V., 2024-11) Moya Calderón, Michael; Barrientos Ávila, Enzo; Loría Chaves, Allan; Carrillo Jiménez, Eduardo; Barriocanal Lozano, Carlos
A nivel mundial, las áreas protegidas representan uno de los principales atractivos para visitantes nacionales e internacionales ( Bushell, 2003 ). Desde finales del siglo XX, el crecimiento turístico ha creado diferentes presiones sobre los espacios naturales, principalmente provocadas por cambios en el uso del suelo ( Boavida-Portugal, Rocha, & Ferreira, 2016 ). La modificación de un ecosistema a través de efectos antropogénicos se conoce como antropización ( Martínez, 2010 ). Uno de los factores que potencia esta problemática es la atracción de los territorios costeros por el turismo de sol y playa ( García-Ayllón, 2018 ). A través del aumento de áreas urbanizadas, mayor flujo vehicular, consumo de recursos naturales , aumento de la contaminación y presión sobre los espacios naturales, el turismo de playa y costero supone severas amenazas para el ecosistema ( Kim, Lee, & Kim, 2019 ).
Aspectos ecológicos del mapache (Procyon lotor) y su relación con los turistas en el Parque Nacional Manuel Antonio, Costa Rica
(Universidad Nacional (Costa Rica). Instituto Internacional en Conservación y Manejo de Vida Silvestre, 2017) Farrera Hernández, Mónica
El área de distribución natural del mapache común (Procyon lotor) es el norte y centro de América. Procyon lotor es la especie más estudiada de la familia Procyonidae por su importancia económica, recreativa y como vector de enfermedades. La población de mapaches del Parque Nacional Manuel Antonio (PNMA) se encuentra en constante contacto con los turistas que visitan el parque. Esta interacción puede estar modificando la conducta natural de los mapaches a nivel de la dieta y los patrones de movimiento. Es importante conocer los patrones de movimiento y la dieta de los mapaches en la actualidad, para establecer medidas de manejo que reduzcan el posible impacto negativo en la salud tanto de la población de mapaches como de la humana. Por esto el objetivo general de este trabajo fue: evaluar aspectos ecológicos del mapache y su relación con los turistas en el PNMA. Se estimóel área de acción y los patrones de actividad y la abundancia de la población de agosto del 2016 a febrero de 2017. Para comparar la relación con los turistas, se hizo un modelo de interpolación para conocer las áreas en las que se concentran los turistas y se estimó la cantidad de comida que estos ingresan al parque. Por último, se compararon los resultados obtenidos con los de un estudio previo del año 1990. Se radio – marcaron seis mapaches, cuatro hembras y dos machos. Se obtuvieron 595 localizaciones, 420 por triangulación de los datos de radiotelemetría y 175 localizaciones por observación directa. Se estimó una población de 12 individuos adultos en la zona de uso intensivo del PNMA. El área de acción de los mapaches varió entre 11 y 19.5 ha. El área de acción promedio de los machos fue de 18.1 ha y el de las hembras de 14 ha. Los mapaches focales fueron más activos durante el día que durante la noche. Las horas de mayor actividad fueron entre las 08.00 y 14.00 h con un pico de actividad a las 09.00 h y otro a las 13.00 h. La ocupación del área de uso intensivo del parque por parte de los turistas fue más frecuente en el área de bancas y la playa Manuel Antonio. Los turistas ingresaron en promedio 198 kg de comida al día. Los alimentos que más entraron al parque fueron las frutas, los emparedados y las barras energéticas. En comparación con el estudio de 1990 el área de acción de los mapaches en este estudio fue menor. Los patrones de movimiento pasaron de ser crepusculares en 1990 a diurnos en la actualidad. Los cambios en el área de acción y los patrones de movimiento de los mapaches en el PNMA se atribuyen a la creciente actividad turística del parque por lo que se proponen recomendaciones para disminuir los efectos negativos por las interacciones fauna – humano.
Assessing species traits and landscape relationships of the mammalian carnivore community in a neotropical biological corridor
(Biodiversity and Conservation, 2016-04-06) Sáenz, Joel
Mammalian carnivores play an important role in regulating food webs and ecosystems. While many carnivore populations are facing various threats such as habitat loss and fragmentation, poaching, and illegal trade, others have adapted to human-dominated landscapes. Information about Neotropical carnivore communities in particular is limited, especially in disturbed landscapes. We conducted a camera trap survey at 38 sites across the San Juan–La Selva Biological Corridor in Costa Rica to assess occupancy and detection probabilities of the carnivore community. We developed hypotheses within a likelihood-based framework in order to determine the landscape features and species traits (diet and size) that influenced their occupancy. We detected nine of the 13 native carnivores predicted to occur in the corridor. When modeled separately, each species responded to land cover changes differently, suggesting no strong community-wide predictors of occupancy. We then modeled three separate guilds within the carnivore community: omnivorous mesopredators, obligate carnivorous mesopredators, and apex predators. These community guild models revealed a negative relationship between omnivorous mesopredators and increasing forest and tree plantation cover, suggesting omnivores utilize forest fragments and edge habitats in agricultural landscapes. Obligate carnivorous mesopredator models did not reveal any strong habitat relationships, but landscape effects tended to contradict our a priori predictions. Apex predators were positively associated with increasing forest and tree plantation cover, protected areas, and increasing distances to villages. Alarmingly, apex predators and obligate carnivorous mesopredators were generally rare within the biological corridor. A lack of top-down control alone might result in heightened occupancy for all mesopredators, but because the community is dominated by omnivorous species, bottom-up release from human-induced land cover changes and resource provision may better explain their high occupancy. © 2016, Springer Science+Business Media Dordrecht.

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