Revista De Biologia Tropical最新文献

{"title":"Variabilidad de comunidades de macroinvertebrados acuáticos en charcas temporales del norte de Colombia","authors":"Daniel Serna-Macias, Cesar E. Tamaris-Turizo, Jorge Oliveros Villanueva, Pedro Eslava-Eljaiek","doi":"10.15517/rev.biol.trop..v71i1.50129","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50129","url":null,"abstract":"Introducción: Las charcas temporales son ecosistemas acuáticos variables en su estructura física y biótica, efímeros en el paisaje e importantes en el flujo de materia y energía. Los macroinvertebrados acuáticos constituyen el grupo más abundante y diverso en estos ecosistemas, por ello, resulta de gran importancia comprender su composición temporal y espacial. Objetivo: Evaluar la diversidad alfa y beta de las comunidades de macroinvertebrados acuáticos de seis charcas temporales durante dos épocas climáticas en el norte de Colombia. Métodos: Se muestreó en la zona litoral y limnética empleando la red tipo D y draga van veen. Se utilizaron índices ecológicos de diversidad alfa y beta mediante el análisis de conglomerados para conocer los grupos conformados, finalmente, se realizó un análisis permutacional entre épocas climáticas y charcas. Resultados: se identificaron 3 358 individuos, representados por 13 órdenes, 39 familias y 68 géneros. La mayor abundancia y diversidad (N = 485, 0D = 32) durante la época de lluvia se presentó en Los Campanos, mientras que la charca Villa Leidy tuvo el mayor número de taxones comunes (18) y dominantes (14). En la época de sequía, la charca Los Trillizos presentó la mayor abundancia (533) y diversidad (43); mientras que Villa Leidy y El Miquito el mayor número de taxones dominantes (16). El análisis de disimilitud evidenció que las charcas tienen una composición particular, ya que no se evidenció agrupamiento a escala espacial ni temporal; además, se observó alto recambio de taxones. Finalmente, el análisis de correspondencia canónica exhibió un agrupamiento debido a la temporalidad. Conclusiones: la composición de las comunidades de macroinvertebrados acuáticos de las charcas temporales son muy diversas, presentando alto recambio tanto espacial como temporal, reflejando altos valores de remplazamiento de taxones entre ápocas climáticas. El análisis de los microhábitats mostró que la zona litoral mantuvo una composición similar durante el estudio.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41957346","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":"Microsporogénesis y ultraestructura de los granos de polen en la planta del cacao, Theobroma cacao (Malvaceae)","authors":"E. Rincón-Barón, G. A. Torres-Rodríguez, V. Cuarán, René Carreño-Olejua, Lilian M. Passarelli","doi":"10.15517/rev.biol.trop..v71i1.51101","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.51101","url":null,"abstract":"Introducción: Estudios sobre la microsporogénesis de la planta del chocolate son inexistentes y poco se conoce sobre la ultraestructura de los granos de polen. Objetivos: se describe por primera vez y de manera pormenorizada el proceso de microsporogénesis, destacándose aspectos ultraestructurales de los granos de polen en T. cacao.  Métodos: Se procesaron más de 30 flores por cada uno de los estadios del desarrollo floral de acuerdo con los protocolos para embeber y seccionar en parafina. Las secciones obtenidas se tiñeron con Safranina-Azul de Alcian, PAS-Amidoblack y Lacmoid. Se procesaron muestras adicionales en resina y se tiñeron con azul de toluidina y se observaron secciones ultrafinas con microscopía electrónica de transmisión (TEM). Para la observación con microscopía electrónica de barrido (SEM), el material se fijó y deshidrató en 2,2 dimetoxipropano, luego se secó hasta un punto crítico y se recubrieron con oro. Resultados: las anteras se diferencian de una masa celular en los extremos distales de los filamentos estaminales. Durante el desarrollo la pared de las anteras presenta varios estratos celulares y al madurar se reducen a la epidermis y al endotecio. Las células madre de microsporas se dividen por mitosis y luego experimentan meiosis para formar tétrades. El tapete es secretor y se mantiene hasta antes de la liberación de los granos de polen, posteriormente degenera. Durante la formación de la esporodermis, primero se deposita la exina y luego la intina. Los granos de polen son isopolares, pequeños, esferoidales, tricolpados. La esporodermis es semitectada, con ornamentación reticulada, retículos heterobrochados, los muros sin ornamentación. Los orbículas son individuales, lisas y de diferentes tamaños. La ultraestructura muestra que los granos de polen son semitectados, la ectexina formada por tectum, columelas y capa basal que constituye la ornamentación reticulada y una endexina muy delgada y compacta. El polenkit es abundante sobre el tectum y entre las columelas. La intina es muy delgada, pero se desarrolla ampliamente en las zonas de los colpos formando una intina compacta interna y una inusual intina externa de apariencia columelada. Conclusión:  La estructura y desarrollo de las anteras sigue los patrones conocidos de las angiospermas. La microsporogénesis simultánea y el depósito centrípeto de la esporodermis se han descrito previamente para Malvaceae. Las características de la intina son novedosos para la familia.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46513680","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":"Flowering time and harvest on floral morphology and production of hermaphrodite flowers in the cashew tree Anacardium occidentale (Anacardiaceae)","authors":"Jéssica Soares Pereira, Júlio César DoVale, Ingrid Pinheiro Machado, J. Melo, F. C. V. Vidal Neto, D. S. Melo, L. M. Barros","doi":"10.15517/rev.biol.trop..v71i1.52092","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.52092","url":null,"abstract":"Introduction: Morphological parameters of flowering are fundamental in the reproductive process of plants, but this subject is poorly explored in the cashew tree Anacardium occidentale. Objective: To determine the influence of the flowering and harvest period on floral parameters, and to identify association with hermaphrodite flowers in the dwarf cashew. Methods: For the 2018 and 2019 harvests in 120 samples we measured number of male/hermaphrodite/abnormal flowers; panicle biomass, length, maximum width, and ramifications at 30, 45 and 60 days for 360 samples in total, for each season (2018 and 2019). Results: The harvest effect was not significant. Panicle length and width (at 30 days), had the greatest contributions to the production of hermaphrodite flowers. The presence of male flowers (at 45 days), and the panicle length and number of primary branches (at 60 days) were the main factors at their respective periods. Conclusions: The emission of hermaphrodite flowers responds negatively to male flowers. Variations in flowering compromise the production of hermaphrodite flowers and the flowering structure.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45348632","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":"Effect of seasonality on the leaf phenology and physiology of Byrsonima species (Malpighiaceae)","authors":"Barbara Godinho Pereira, A. D. Faria, V. C. Kuster, A. Moreira","doi":"10.15517/rev.biol.trop..v71i1.50344","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50344","url":null,"abstract":"Introduction: Defined seasonality in savanna species can stimulate physiological responses that maximize photosynthetic metabolism and productivity. However, those physiological responses are also linked to the phenological status of the whole plant, including leaf phenophases. Objective: To study how physiological traits influence phenophase timing among congeneric and co-occurring savanna species. Methods: We evaluated the leaf phenology and physiological traits of populations of Byrsonima intermedia, B. coccolobifolia, and B. verbascifolia. Physiological measurements were performed at the onset of the dry and rainy seasons and again late in the season. Results: B. intermedia and B. coccolobifolia were classified as brevideciduous and B. verbascifolia as evergreen. The maximum quantum yield for B. intermedia and B. coccolobifolia were lowest during the dry season. At the onset of the dry period, the highest chloroplastidic pigment levels were observed, which decreased as the season advanced, total chlorophyll/carotenoid ratios were lowest, and carotenoid contents were highest. We detected low starch content values at the start of the rainy season, coinciding with the resumption of plant growth. Two months into this season, the leaves were at their peak structural and functional maturity, with high water-soluble polysaccharide values and photosynthetic rates, and were storing large amounts of starch. Conclusions: Physiological and leaf phenological strategies of the Byrsonima species were related to drought resistance and acclimatization to the seasonality of savanna water resources. The oscillations of the parameters quantified during the year indicated a strong relationship with water seasonality and with the phenological status of the leaves.\u0000Objective: We studied how physiological traits, and not only seasonality, influence phenophase timing among congeneric and co-occurring savanna species.\u0000Methods: We followed the leaf phenologies and physiological traits of populations of Byrsonima intermedia, B. coccolobifolia, and B. verbascifolia native to the Brazilian savanna. Analyses of specific leaf mass, relative water content, leaf phenology, leaf carbohydrate content, chloroplastidic pigments, and photosynthetic efficiency were performed at different times during both the dry and rainy seasons. Physiological measurements were performed at the onset of the dry season and again late in that season, as well as at the onset of the rainy season and again late in the rainy season.  \u0000Results: Byrsonima intermedia and B. coccolobifolia were classified here as brevideciduous and B. verbascifolia as evergreen. Few variations in chlorophyll a fluorescence values were detected over the full year, with the lowest maximum quantum yield values (Fv/Fm) for B. intermedia and B. coccolobifolia occurring during the dry season. The deciduous species (B. verbascifolia) evidenced higher photosynthetic yields during periods of abundant water availability, mainly afte","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42931417","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":"Ontogeny of digestive enzymes in clown anemonefish larvae, Amphiprion ocellaris (Perciformes: Pomacentridae)","authors":"G. Velasco-Blanco, C. A. Álvarez González, M. I. Abdo de la Parra, L. E. Rodríguez-Ibarra, L. Ibarra-Castro, C. I. Maytorena-Verdugo, José Natividad Arias-Jiménez, Emyr Saul Peña Marín","doi":"10.15517/rev.biol.trop..v71i1.51085","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.51085","url":null,"abstract":"Introduction: Clown anemonefish (Amphiprion ocellaris) is the most popular fish species in the marine aquarium trade, however, there is a lack of information on their digestive physiology during larvae ontogeny, valuable information that helps in the design of specific diets, as well as management protocols for the species. Objective: Characterize the early development of digestive enzymes of A. ocellaris during larvae ontogeny. Methods: From hatching until the 38th day after hatching (DAH), the specific activity of acid and alkaline proteases, trypsin, chymotrypsin, leucine aminopeptidase and lipase were analyzed, while acid and alkaline proteases zymograms were performed. Results: At hatching, all measured enzymes activities were detected. Acid proteases increased in activity from hatching until the 38th DAH. Alkaline proteases, trypsin, chymotrypsin, and leucine aminopeptidase showed the same pattern and maximum activity on the 8th DAH, decreasing at the 38th DAH. Lipase activity showed peaks on the 8th and 30th DAH. Acid zymogram showed a single band, appearing on the 8th DAH. A total of eight alkaline proteases were revealed (154.2, 128.1, 104.0, 59.8, 53.5, 41.9, 36.5 and 25.1 KDa), showing seven bands on the 1st DAH and all bands from the 3rd to 8th DAH, decreasing at two bands (41.9 and 25.1 KDa) in the 38th DAH. Conclusion: A. ocellaris shows a functional stomach on the 8th DAH, where the species on the 38th DAH shows digestive enzymatic pattern to omnivore with a tendency to carnivory.\u0000Objective: Characterize the early development of digesive enzymes of A. ocellaris during larval ontogeny.\u0000Methods: From hatching until the 38th days after hatching (DAH), the specific activity of acid and alkaline proteases, trypsin, chymotrypsin, leucine aminopeptidase and lipase were analysed, while acid and alkaline proteases zymograms were perfomed.\u0000Results: At hatching, all measured enzymes activities were detected. Acid proteases increased in activity from hatching until the 38th DAH. Alkaline proteases, trypsin, chymotrypsin and leucine aminopeptidase showed same pattern and maximum activity on the 8th DAH, decreasing at the 38th DAH. Lipase showed activity peaks on the 8th and 30th DAH. Acid zymogram showed a single band, appearing on the 8th DAH. Total of eight alkaline proteases were reveled (154.2, 128.1, 104.0, 59.8, 53.5, 41.9, 36.5 and 25.1 KDa), showing seven bands on the 1st DAH and all band from the 3rd to 8th DAH, decreasing at two bands (41.9 and 25.1 KDa) in the 38th DAH.\u0000Conclusion: Therefore, A. ocellaris shows functional stomach on the 8th DAH, where the species on the 38th DAH shows digestive enzymatic pattern to omnivore with a tendency to carnivory.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44921984","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":"Age and growth assessment of the near-threatened fish Rita rita (Siluriformes: Bagridae) in the Ganges basin","authors":"A. Ankita, M. A. Khan, Salman Khan","doi":"10.15517/rev.biol.trop..v71i1.51734","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.51734","url":null,"abstract":"Introduction: Rita rita is a freshwater catfish under threat of extinction, mainly from loss of breeding and nursing grounds. A reliable method for age and growth estimation is needed by fishery managers. Objective: To identify the best body structure for age and growth estimation. Methods: We assessed estimates precision based on Average Percent Error (APE), Coefficient Variation (CV), and Percent Agreement (PA) between readers separately analyzed each calcified structure. We used 390 fish samples from three rivers, Ganga, Yamuna and Ramganga, from September 2018 to August 2019. Results: The three indicators favored the use of vertebrae for age estimation; the growth band seems to be annual and formed from May to September. The growth equations were Lt = 90.19(1-e-0.145(t+0.51)) for Ganga; Lt = 91.19 (1-e-0.14(t+0.59)) for Yamuna and Lt = 89.63 (1-e-0.15(t+0.68)) for Ramganga. Conclusion: This species reaches moderate growth in these rivers, where vertebrae are the recommended age estimation structure, followed, in case of need, by sectioned otoliths, whole otoliths and opercular bones. Pectoral spines should be avoided, especially in older fish.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43256930","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":"Jaguar conservation in the American continent: the role of protected landscape and human-impacted biomes","authors":"Erik Joaquín Torres‐Romero, G. Ceballos, Francisco Botello, J. I. González Rojas, A. Giordano, J. López‐Bao","doi":"10.15517/rev.biol.trop..v71i1.50507","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50507","url":null,"abstract":"Introduction: Worldwide, expanding human activities continue to be a threat to many large-bodied species, including jaguars. As these activities continue, it is critical to understand how home range sizes will be impacted by human-modified landscapes. Objective: To evaluate the importance of protected and unprotected land on home-range size across their range. Methods: We used home range data from 117 jaguars in several habitat protection categories and human biome types. We used a Generalized Linear Mixed Model to test home range and spatial overlap with conservation categories and human biomes. Results: Most home-ranges were in Jaguar Conservation Units (62 %), followed by Protected Areas (21 %), Indigenous People's Lands (10 %) and Jaguar Movement Corridors (3 %), where 76 % of the jaguars lived inside one the first three conservation types. However, outside of conserved land, Rangeland, Cropland, Seminatural land and other human biomes were also important (24 % of the individuals). Jaguars in Rangeland, Cropland and Seminatural land had the largest home ranges. Conclusions: Although conservation land was dominant, human-impacted lands appear to play a considerable role in satisfying the spatial requirements of jaguars.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47074808","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":"Silage quality and bacterial diversity of silages inoculated with Listeria monocytogenes and Lacticaseibacillus paracasei_6714","authors":"N. Barboza, L. Brenes-Guillén, L. Uribe, Rodolfo WingChing-Jones","doi":"10.15517/rev.biol.trop..v71i1.50692","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50692","url":null,"abstract":"Introduction: King grass (Cenchrus purpureus (Schumach.) Morrone, syn. Pennisetum purpuphoides) and pineapple peel (Ananas comosus) silages are food alternatives for livestock in conditions of feed shortage. Objective: To describe the dynamics of the microbiota present in king grass and pineapple silage during the fermentation process using next generation sequencing (NGS) and to evaluate the protective effect of Lacticaseibacillus paracasei_6714 as a silage inoculum against Listeria monocytogenes. Methods: We used an unrestricted randomized design to characterize the microbiota present in silages made from king grass harvested 70 days after regrowth and pineapple peel. We inoculated mixtures of grass and peel with L. paracasei_6714 or L. monocytogenes, or both, with a non-inoculated treatment as control. The nutritional and fermentative profile was evaluated after 30 days. After 15 and 30 days of fermentation, we used 16S rRNA analysis to determine the dynamics and diversity of the microbiota in the inoculated and control silages. Result: Dry matter content and digestibility did not differ significantly; however, there were differences in crude protein, pH and organic acids. We obtained 4432 amplicon sequence variants of Proteobacteria, Firmicutes, Bacterioidetes, Actinobacteria, Verrucomicrobia, Planctomycetes and Patescibacteria. The relative abundance of each phylum varied depending on the material and fermentation period. Phylum similarity was over 70 % (but not greater than 50 % with Bray-Curtis at the species level). Conclusion: These bacterial communities seem to have an important role during silage fermentation. Proper management of silage processing can reduce or eliminate pathogenic bacteria.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45142826","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":"Space-time patterns and drivers of migrant bird communities in coastal Piauí State, Brazil","authors":"C. O. Cardoso, Davi da S. Sales, Muryllo dos S. Nascimento, A. J. S. Siqueira, O. A. Pereira, Suely S. Dos Santos, Francisco das Chagas V. Dos Santos, Pedro B. de M. Carneiro, Anderson Guzzi","doi":"10.15517/rev.biol.trop..v71i1.47300","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.47300","url":null,"abstract":"Introduction: Migration is a natural phenomenon that includes annual movements of many bird species in response to seasonal cycles. With approximately one third of all living bird species, South America has an important avifauna, and many migrants land in Brazil at stopping points and wintering sites. Objective: To identify associations between migrant birds and coastal vegetation, and environmental influence of on migration. Methods: At 10 points along the coast of Piauí State, Brazil, we made visual censuses and mist net captures, between April 2009 and February 2016. Results: We identified 82 migrant bird species (13 orders; 28 families) that represented 41 intracontinental migrating species, 26 northern visiting species, 14 nomad species and one vagrant species. The richness peaks were at the beginning and end of both dry and rainy seasons, matching insolation and atmospheric pressure.  There were spatial pattern differences among vegetation complexes. Chrysolampis mosquitus is an indicator of caatinga vegetation, Numenius phaeopus of wetland, Charadrius collaris of non-flooding fields, Rostrhamus sociabilis of forest-grassland transition, and Columbina picui of orchards. Despite differences in number and species composition within vegetation types, the temporal pattern in species richness was similar among flooded fields, non-flooded fields, and transition grassland categories. Conclusions: Migrant birds occupy specific environments during their permanence along the coast of Piauí State, with richness matching insolation and atmospheric pressure.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297312","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":"Effect of ecoregion and river type on neotropical Chironomidae (Diptera) from humid mountain to semiarid lowland","authors":"E. J. Pero, S. E. Torrejón, C. Molineri","doi":"10.15517/rev.biol.trop..v71i1.50081","DOIUrl":"https://doi.org/10.15517/rev.biol.trop..v71i1.50081","url":null,"abstract":"Introduction: Chironomidae (Diptera) is the most widespread and abundant aquatic insect family in freshwater ecosystems. Chironomids are considered good indicators of water quality but are seldom identified at the genus level in broad spatial scale studies. Objective: To identify environmental conditions associated with chironomids in an altitudinal gradient. Methods: We compared ecoregions, river types, and seasons, for chironomids in neotropical streams and rivers (18 river sites; 2014-2018; Yungas rainforest and Western Chaco dry forest, Argentina). We used non-metric multidimensional scaling, dissimilarity, envfit analysis and rank-abundance curves. Results: Chironomic “assemblages” matched both ecoregions and river types. However, ecoregions presented a better fit with species composition. The stenothermal taxa of Orthocladiinae were dominant at high elevations and the eurythermal Chironominae in lowland rivers. Altitude, water temperature and conductivity were important. Seasonal differences were smaller than ecoregional differences. Conclusions: Ecoregions, altitude, water temperature and conductivity correlated with chironomid communities. Orthocladiinae were dominant at high elevations and Chironominae in lowland rivers.","PeriodicalId":21368,"journal":{"name":"Revista De Biologia Tropical","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47241187","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}