Revista De Biologia Tropical最新文献

{"title":"Reserve mobilization and secondary metabolites during seed germination and seedling establishment of the tree Erythrina velutina (Fabaceae)","authors":"Diego Augusto Azevedo-da-Silva, Danilo Flademir Alves-de-Oliveira, Herley Carlos Bezerra-de-Oliveira, Thadeu Martins Feitosa, Ivanice Bezerra Da Silva, Raquel Brandt Giordani, Eduardo Luiz Voigt","doi":"10.15517/rev.biol.trop..v71i1.49004","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.49004","url":null,"abstract":"Introduction: The lack of knowledge on seed germination and seedling establishment is a main constraint for the restoration of degraded areas, including the tropical dry forest known as Caatinga. Objective: To assess reserve and secondary metabolite mobilization during seed germination and seedling establishment in Erythina velutina. Methods: We scarified, disinfected, imbibed, sown between towel paper, and incubated seeds under controlled conditions. We hydroponically cultivated seedlings in a greenhouse. We harvested cotyledons at seed imbibition, radicle protrusion, hypocotyl emergence, apical hook formation and expansion of cordiform leaves, first trifoliate leaf, and second trifoliate leaf. Results: Seeds contained approximately 20 % starch, 14.5 storage proteins, 11.6 neutral lipids, and 5.7 % non-reducing sugars on a dry weight basis. Soluble sugars were mainly consumed from hypocotyl emergence to apical hook formation, while major reserves were mobilized from apical hook formation to expansion of first trifoliate leaf. Enzymatic activity increased from mid to late seedling establishment, causing the mobilization of starch, oils, and proteins. Terpenoid-derivatives, flavonoids, phenolic acids, and alkaloids were detected. Flavonoids and phenolic acids were present at almost all stages and terpenoid-derivatives disappeared at expansion of cordiform leaves. Conclusion: Soluble sugars support early seedling growth, while starch, oils and proteins are simultaneously mobilized from mid to late establishment by amylases, lipases, and acid proteases. The cotyledons contain secondary metabolites, which may act in seedling defense. High content of reserves and presence of secondary metabolites in the cotyledons could enable E. velutina seedlings endure stress, validating their use in the restoration of degraded areas.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135472097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Naturalistas y científicos extranjeros influyentes en el desarrollo de las ciencias biológicas en Costa Rica","authors":"Luko Hilje Quirós","doi":"10.15517/rev.biol.trop..v71is3.56213","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71is3.56213","url":null,"abstract":"Introducción: Desde los inicios de su vida republicana, el desarrollo de las ciencias biológicas en Costa Rica ha estado muy influido por centenares de naturalistas y científicos extranjeros, quienes han efectuado actividades de exploración, investigación y publicación en relación con su biodiversidad. 
 Objetivo: Para entender mejor sus contribuciones, en este artículo se hace un recorrido histórico, con énfasis en el último siglo y medio, en cuanto a las motivaciones que atrajeron a estas personas a Costa Rica, así como a sus aportes científicos concretos. 
 Métodos: Para tratar este tema se definieron seis criterios: a) si fueron residentes o itinerantes; b) si mantuvieron una relación frecuente con Costa Rica; c) si realizaron recolección de especímenes; d) el tipo de publicación y e) si efectuaron docencia o gestión institucional. 
 Resultados: La información está organizada en seis grandes secciones, estructuradas de manera cronológica, así: los primeros inventarios de la biodiversidad de Costa Rica (1513-1842), el reconocimiento de las ciencias biológicas en la cultura costarricense (1839-1848), la inserción de las ciencias biológicas en la cultura costarricense (1854-1886), la institucionalización de las ciencias biológicas en Costa Rica (1886-1900), Costa Rica como meca para efectuar exploraciones biológicas (1900-1957) y la formación de profesionales en ciencias biológicas (1940-2021). 
 Conclusiones: Esta periodización nos permite contextualizar los aportes de dichos naturalistas o científicos en el tiempo, así como visualizar de mejor manera los acontecimientos y las circunstancias económicas, sociales y políticas que condicionaron sus labores científicas.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135472763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Litterfall and nutrient transfer dynamics in a successional gradient of tropical dry forest in Colombia","authors":"Angie Montañez-S, Andrés Avella-M, René López Camacho","doi":"10.15517/rev.biol.trop..v71i1.52278","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.52278","url":null,"abstract":"Introduction: The litterfall production, foliar nutrient dynamics and decomposition are essential to maintain nutrient cycling, soil fertility, and carbon regulation in terrestrial ecosystems. With several studies addressing the variation of these processes, their dynamics in tropical dry forests (TDFs) remain unclear, due to its complex interaction of biotic and abiotic factors. Objective: To evaluate litterfall, nutrient potential return and use efficiency, and decomposition variation in a TDF successional gradient in Tolima, Colombia. Methods: We quantified litterfall from November 2017 to October 2019 in 12 plots distributed in four successional stages: initial, early, intermediate, and late forests. We identified key tree species in foliar litter production and characterized the foliar decomposition of these species. At the community level, we quantified the C, N and P potential return, the N and P use efficiency, and the C:N and N:P ratio. Subsequently, we analyze relationships between vegetation characteristics and some soil chemical properties with these ecological processes. Results: We found that total litterfall in late forests (8.46 Mg ha-1 y-1) was double that found in initial forests (4.45 Mg ha-1 y-1). Decomposition was higher in initial (k = 1.28) compared to intermediate (k = 0.97) and late forests (k = 0.87). The nutrient potential return didn’t change along succession, but it did show differences between study sites. The structural development and species richness favored litterfall, while soil chemical conditions influenced nutrient returns and decomposition. Conclusions: TDFs could recover key ecosystem function related to litterfall and nutrient dynamics after disturbances cessation; however, the soil quality is fundamental in return and release of nutrients.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135472098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Herramientas de corte para optimizar parámetros de clasificación de especies maderables con redes neuronales convolucionales","authors":"Thonny Behyker Centeno, Cassiana Ferreira, Janet Gaby Inga, Andrés Vélez, Raul Huacho, Osir Daygor Vidal, Sthefany Madjory Moya, Danessa Clarita Reyes, Walter Emilio Goytendia, Benji Steve Ascue, Mario Tomazello-Filho","doi":"10.15517/rev.biol.trop..v71i1.51310","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.51310","url":null,"abstract":"Introducción: La gran diversidad de especies maderables tropicales demanda el desarrollo de nuevas tecnologías de identificación con base en sus patrones o características anatómicas. La aplicación de redes neuronales convolucionales (CNN) para el reconocimiento de especies maderables tropicales se ha incrementado en los últimos años por sus resultados prometedores. Objetivo: Evaluamos la calidad de las imágenes macroscópicas con tres herramientas de corte para mejorar la visualización y distinción de las características anatómicas en el entrenamiento del modelo CNN. Métodos: Recolectamos las muestras entre el 2020 y 2021 en áreas de explotación forestal y aserraderos de Selva Central, Perú. Luego, las dimensionamos y, previo a la identificación botánica y anatómica, las cortamos en secciones transversales. Generamos una base de datos de imágenes macroscópicas de la sección transversal de la madera, a través del corte, con tres herramientas para ver su rendimiento en el laboratorio, campo y puesto de control. Resultados: Usamos tres herramientas de corte para obtener una alta calidad de imágenes transversales de la madera; obtuvimos 3 750 imágenes macroscópicas con un microscopio portátil que corresponden a 25 especies maderables. El cuchillo “Tramontina” es duradero, pero pierde el filo con facilidad y se necesita una herramienta para afilar, el cúter retráctil “Pretul” es adecuado para madera suave y dura en muestras pequeñas de laboratorio; el cuchillo “Ubermann” es apropiado para el campo, laboratorio y puesto de control, porque tiene una envoltura duradera y láminas intercambiables en caso de pérdida de filo. Conclusiones: La calidad de las imágenes es decisiva en la clasificación de especies maderables, porque permite una mejor visualización y distinción de las características anatómicas en el entrenamiento con los modelos de red neuronal convolucional EfficientNet B0 y Custom Vision, lo cual se evidenció en las métricas de precisión.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135471822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertebrados silvestres atropellados en asentamientos humanos del Pacífico sur mexicano","authors":"Silberio García-Sánchez, Alejandro Juárez-Agis, Edson A. Alvarez-Alvarez, Branly Oliver Salome, Jacqueline Zeferino Torres, Mayra Rivas González, Angel Neftali Osorio Rodriguez","doi":"10.15517/rev.biol.trop..v71i1.53600","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.53600","url":null,"abstract":"Introducción: Las vías de comunicación son parte del desarrollo económico y social en todo el mundo. El desarrollo de carreteras causa la fragmentación de ecosistemas naturales, aumentando el riesgo de mortalidad de los animales silvestres por atropellamientos vehiculares. Objetivo: Analizar la tasa de mortalidad de vertebrados silvestres atropellados de acuerdo con la temporada climática y el grado de urbanización en una zona costera del estado de Guerrero, al sur de México. Métodos: Se realizaron 12 recorridos con tres observadores en un vehículo a una velocidad de 30 km/h durante un año (junio de 2021 a mayo de 2022). Los organismos fueron georreferenciados e identificados. Se calculó la tasa de atropellamiento (atropellos/día/kilómetro) de los vertebrados silvestres. Resultados: Se registraron 37 especies de vertebrados silvestres atropellados, de las cuales nueve están en peligro de extinción y siete son endémicas de México. Los mamíferos presentaron la tasa de mortalidad más elevada (0.126 animales atropellados/día/km). No hubo diferencias en la tasa de mortalidad entre temporadas. Se detectaron 11 puntos calientes (hotspots) de atropellos. Se identificaron más vertebrados silvestres atropellados en zonas de baja urbanización que en áreas de media y alta. Conclusión: Nuestros resultados mostraron que los mamíferos son los vertebrados silvestres más vulnerables a los atropellamientos vehiculares. El riesgo de atropellamientos de animales silvestres está relacionado con el nivel de urbanización. Este estudio puede ser una herramienta en el desarrollo de carreteras sustentables para la fauna silvestre.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136163077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morpho-anatomy of in vitro germination and cryopreservation of the orchid Cattleya crispa (Orchidaceae)","authors":"Bruna Vargas Andriolli, Jenny Paola Corredor-Prado, Rosete Pescador, Francisco Sebastian Montoya-Serrano, Lírio Luiz Dal Vesco, Rogério Mamoru Suzuki","doi":"10.15517/rev.biol.trop..v71i1.52338","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.52338","url":null,"abstract":"Introduction: Cattleya crispa is an ornamental epiphytic orchid with geographic distribution restricted to the Brazilian Atlantic Forest. Due to predatory extractivism and human-induced habitat loss, this species appears on the Red List of Brazilian Flora. Objective: To characterize morpho-anatomical aspects regarding germination and post-seminal development from C. crispa seeds; as well as studying the effect of cryopreservation on these seeds. Methods: We used light microscopy and electron microscopy to describe the microstructure of a 100 ripe seeds. We evaluated seed viability, seed germination, survival rate and protocorm weight in cryopreserved and non-cryopreserved material, with four replicas per treatment using 20 mg of plant material. Results: The seeds are fusiform, whitish yellow with a length from 700 to 900 µm and a water content of 5 %. Germination began seven days after sowing, the formation of the globular protocorm at 30 days and the formation of the seedling occurred 150 days. The persistent seed coat can compress the protocorm and cause it to collapse. The cryopreserved seeds presented 87.15 % viability, 78.32 % germination, 8.48 % survival and protocorms with 104.27 mg five months after sowing. Data wasn’t different to non-cryopreserved seeds. Conclusions: The cryocapability of the seeds shows that cryopreservation can be used for long-term conservation. The results of this work contribute to the overall biology of C. crispa and to the propagation and storage of genetic material for conservation purposes. Objective: To characterize morpho-anatomical aspects regarding germination and initial development from C. crispa seeds; as well as studying the effect of cryopreservation on these seeds. Methods: Mature capsules of C. crispa were collected from the ex-situ conservation collection of the Orquidário Frederico Carlos Hoehne - Institute of Botany (São Paulo-Brazil). We used light microscopy, scanning electron microscopy and transmission electron microscopy. Seed viability (%), seed germination (%), survival rate (%) and protocorms weight (mg) were evaluated. Results: Our analyses showed that the globular embryo has a homogeneously early germination that occurs by the 7th day. The germinating protocorm shows bipolarity, with shoot apex and basal region. The embryo is composed mostly of lipid and protein bodies and contains a few small grains of starch. Scanning electron microscopy images revealed a persistent seed coat that does not influence the onset of germination, however, can compress the protocorm and lead to its collapse. The initial water content of the seeds was 5 %. Seeds submitted to cryopreservation resulted in a high germination rate (81.14 %). However, the survival rate of non-cryopreserved (8.48 %) and cryopreserved (11.12 %) protocorms, evaluated five months after sowing, was reduced. Conclusions: The cryocapability of the seeds shows that cryopreservation can be used for long-term conservation. The results of th","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136163076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Vibrio populations in a transect of Rhizophora mangle in Punta Galeta, Panamá: culture-dependent analyses reveal biotechnological applications","authors":"Joel Sánchez-Gallego, Librada Atencio, Jacinto Pérez, Omar Dupuy, Edgardo Díaz-Ferguson, Filipa Godoy-Vitorino","doi":"10.15517/rev.biol.trop..v71i1.50983","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50983","url":null,"abstract":"Introduction: Rhizophora mangle is considered a niche for microorganisms with potentially novel and complex degrading enzymes. Objective: To characterize Vibrio populations using culture-dependent methods, from samples collected from sediments and water along a red mangrove transect composed of three sites. Methods: Strains were characterized according to their distribution, diversity, degradation of organic matter, and environmental parameters. Results: Bacterial densities were strongly associated with temperature and salinity. A total of 87 good-quality sequences representing the isolates from the three sites, were binned into eight OTUs (Operational taxonomic units). Taxonomic assignment indicated that the dominant members were Vibrionaceae. Beta diversity analyses showed that bacterial communities clustered by sample source rather than spatial distribution, and that alpha diversity was found to be higher in water than in sediment. Three percent of the strains from water samples could degrade carboxyl-methyl cellulose with the smallest enzymatic indexes compared to 4 % of the strains from sediment samples that showed the highest enzymatic indexes. Two strains identified as Vibrio agarivorans degraded cellulose and agarose, producing the highest enzymatic indexes. Conclusions: We found higher bacterial densities and diversity in the bacterial communities of the water samples compared to the sediment, with different OTUs including those similar to Ferrimonas, Providencia, or Shewanella which were not isolated in the sediment. Vibrio OTUs were shown to degrade cellulose in both sample types. The results of this study highlight the importance of red mangroves as Vibrio habitats and as reservoirs of potential enzyme sources with biotechnological applications.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136163075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variabilidad genética del pez Lutjanus guttatus (Perciformes: Lutjanidae) mediante el uso de microsatélites en Costa Rica","authors":"Alejandra Murillo Rios","doi":"10.15517/rev.biol.trop..v71i1.53380","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.53380","url":null,"abstract":"Introduction: The rose spotted snapper (Lutjanus guttatus) is a highly consumed marine fish and of commercial interest in Costa Rica, under a strong fishing pressure that can affect the genetic diversity of the population creating problems related to inbreeding depression. Objective: To evaluate the genetic diversity of the spotted snapper (Lutjanus guttatus) population in Costa Rica using microsatellites. Methodology: Samples were collected from two locations (Golfo Dulce and Golfo de Nicoya) in 2019, and 44 individuals from each site were studied. DNA extraction and amplification of 10 microsatellites by PCR were carried out for subsequent genotyping for genetic diversity and population structure analysis. Results: The genetic diversity parameters show a high polymorphism, associated to a high number of alleles per locus, but low levels of observed heterozygosity in comparison to the expected heterozygosity (Ho = 0,774 and 0,800 and He = 0,948 and 0,954 for Gulf of Nicoya and Gulf Dulce, respectively). The study of population differentiation indicates that there is not enough evidence to ensure the two populations are different (FST = 0,00264, p > 0.05). The significant deviation from Hardy-Weinberg Equilibrium obtained indicated the possible presence of organisms in the population that does not come from the wild. Conclusions: The rose spotted snapper in Costa Rica shows high levels of genetic diversity, without evidence of differentiation in genetic subpopulations, that should be considered as a single panmictic population for fishery management purposes. The possible mix of individuals of a distinct origin found in the wild suggests the presence of organisms that come from a stock enhancement program or from commercial aquaculture carried out in the region. The use of genetic markers is recommended to keep track of the genetic characteristics of the wild population, to follow-up stock enhancement programs, and eventually, asses their effect.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135755956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Foraging ecology of the bird Eupsittula canicularis (Psittaciformes: Psittacidae) in a modified Mexican landscape","authors":"Itzel Flores-Yllescas, M. Á. De Labra-Hernández","doi":"10.15517/rev.biol.trop..v71i1.52180","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.52180","url":null,"abstract":"Introduction: Seasonal phenological variations in tropical forests cause changes in food resource availability. Animals use foraging strategies to follow the food supply in these settings. The Orange-fronted Parakeet (Eupsittula canicularis) mainly inhabits the tropical dry forest of the Mexican Pacific to Northwest Costa Rica, although little is known about its diet and foraging strategies. Objective: To assess spatial variability in food resource abundance, diet, and foraging behavior of the Orange-fronted Parakeet in a modified landscape in Oaxaca Coast, Mexico. Methods: 30 phenology transects (200 × 6 m) were established during the dry season (February-June 2019) to measure food resource availability in primary deciduous, semi-deciduous, and secondary forests. The Orange-fronted Parakeets diet was determined by focal foraging observations, and dietary niche breadth and resource selection were considered to determine feeding strategies. Results: Orange-fronted Parakeets fed on fruits (42.3 %), seeds (29.3 %), and flowers (28.4 %) of 13 plant species and presented a broad dietary niche breadth with a higher frequency of foraging in primary forest. The Orange-fronted Parakeets select resources and adapt their foraging strategies based on food resource availability in each habitat. Conclusions: The study findings highlights the need to maintain the complete forest structure in a modified landscape to ensure food resources availability for Orange-fronted Parakeets during the breeding season.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44771734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacto de la extracción de materiales aluviales en la diversidad de reptiles del Río Tehuantepec, Oaxaca, México","authors":"Héctor Romero-Santiago, Aressia E. García-Mello, José L. Arcos-García, Noé Ruiz-Garcia","doi":"10.15517/rev.biol.trop..v71i1.52471","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.52471","url":null,"abstract":"Introducción: El aprovechamiento de materiales aluviales: arena, grava y cantos rodados de los lechos de ríos impacta directamente a la fauna silvestre asociada a ellos. Los más afectados son aquellos grupos de menor talla, ámbito hogareño pequeño y poca vagilidad, como los reptiles. Se seleccionó a este grupo como indicador del efecto de la instalación de graveras por su sensibilidad a la alteración de su hábitat. Objetivo: Determinar el impacto de la extracción de materiales aluviales en la diversidad y estructura de las comunidades de reptiles. Métodos: el estudio se realizó en las llanuras de inundación del río Tehuantepec, Oaxaca, México. Se establecieron seis parcelas de 300 x 25 m, tres en área de extracción de materiales aluviales y otras tres en áreas sin extracción. En estas dos condiciones contrastantes se realizó el inventario de reptiles. También se registraron variables relevantes del hábitat para reptiles. Se comparó la diversidad alfa y beta entre ambas condiciones. Resultados: Se registraron 27 especies. En el área con extracción se observó una menor riqueza y abundancia (14 especies y 390 individuos) que en el área sin extracción (26 especies y 1 205 individuos). El efecto negativo fue mayor en las serpientes, ocasionando una diferencia de 75 % en la riqueza, mientras que en los saurios fue del 32 %. La abundancia de reptiles estuvo correlacionada con los cuerpos de agua, la exposición al sol y la vegetación herbácea. Conclusiones: El establecimiento de las graveras tuvo un impacto negativo en la diversidad y abundancia de reptiles. El efecto negativo fue mayor en las serpientes, las cuales, desaparecieron del área de aprovechamiento de materiales aluviales.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46766787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}