Browsing by Autor "Guido Miranda"

Now showing 1 - 20 of 24

A catfish of the genus Trichomycterus from a thermal stream in southern South America (Teleostei, Siluriformes, Trichomycteridae), with comments on relationships within the genus
(Wiley, 2007) Leticia A. Fernández; Guido Miranda
The first record of two trichomycterid species from the thermal waters of a small stream in Miraflores, north of Potosí, Bolivia is given. The reported species are Trichomycterus therma n. sp. and Trichomycterus tiraquae . The new species differ from all congeners in the possession of thickened transverse skin on the ventral surface of the head. They are further distinguished from all congeners by the following combination of characteristics: presence of spatulate incisiform premaxillary teeth; presence of large and rounded papilla‐like structures on trunk of body; continuous segment of the laterosensory canal within the frontal with the presence of a segment between pores 2 and 6; long laterosensory canal with four to six pores; maxilla with a short anterior process that is smaller than the main axis of the bone, and has an anterior orientation; mesethmoid shaft narrower than the width of the lateral cornua; prepelvic length 58·7–61·0% of standard length ( L S ); head width 19·1–22·8% of L S ; submaxillary barbel length 23·9–37·5% of head length ( L H ). Two derived characters, namely the presence of spatulate incisiform premaxillary teeth and large and rounded papilla‐like structures, define a monophyletic group within Trichomycterus , comprising T. therma , T. corduvensis and T. tiraquae .
Advances in the Knowledge and Study of Invasive Alien Species in Bolivia
(2021) Wendy L. Tejeda; Adriana Rico‐Cernohorska; Stephan Beck; Alfredo F. Fuentes; Robert B. Wallace; Guido Miranda; Luís F. Aguirre; María del Pilar Fernández Murillo
The value of knowledge about the negative effects of invasive alien species (IAS) on biodiversity, ecosystems, national economies, human health, and climate change mitigation is increasingly important. Bolivia considered the problem of IAS in the Biological Invasions, Invasive Information Network I3N–IABIN workshop, which generated an IAS database for different countries detailing the location of species, their economic and ecological impacts, as well as entry routes, and propagation, although for the most part, only lists of plant and animal IAS can be derived from national scientific collections. Here, we feature several plant and animal species with more detailed information. Finally, due to the consequences of IAS on the country's native biodiversity, human health, and economic activities these systematization initiatives informed national policy. In Bolivia, there are at least 150 species considered as introduced or exotic, including crop species, information that needs to be refined and updated.
Aportes desde la ciencia ciudadana al Proyecto Tortugas de Bolivia en iNaturalist
(2022) Sandra Acebey; Enrique Domic-Rivadeneira; Guido Miranda
We present an analysis of the contribution of citizen observers who are part of the Bolivian Turtle Project in the iNaturalist application created in 2019. We reviewed 213 observation records from 2000 to 2020, of which 194 correspond to 12 native species and 19 records are of introduced species. Of the total of records, 69% correspond to observations in the wild and 170 have been identified at species level, but only 118 are recognized as of research-value by iNaturalist, being the species with the best quality of information: Podocnemis unifilis, Chelonoidis denticulatus and Chelonoidis carbonarius. These three species and Phrynops geoffroanus are the most frequently observed. The work showed that the Bolivian Turtle Project is the most important at the national level for this taxonomic group and contributes to our knowledge of this group. It also reveals that there is a need to improve resources to improve observations and participation through the sharing of experiences and feedback with other resources on social media.
Delimiting species by reproductive isolation: the genetic structure of epigean and hypogean Trichomycterus spp. (Teleostei, Siluriformes) in the restricted area of Torotoro (Upper Amazon, Bolivia)
(Springer Science+Business Media, 2007) Jean‐François Renno; Claude Gazel; Guido Miranda; Marc Pouilly; Patrick Berrebi
Description of two new species of Bujurquina (Teleostei: Cichlidae) from the Bolivian Amazon
(Sociedade Brasileira de Ictiologia, 2023) M. Careaga; Guido Miranda; Fernando M. Carvajal‐Vallejos
Abstract Two new species of Bujurquina are described from the Bolivian Amazon basin. The first new species inhabits the Beni River drainage and is distinguished from its congeners in the combination of the following characters: longer snout, deeper head, body and caudal peduncle, shorter pectoral fin, more scales in the E1 series, discontinuous longitudinal band, bars 5 and 6 not fused, preopercular spot and coloration pattern on flank scales absent. The second new species inhabits the Mamoré and Iténez river drainages, and differs from its congeners in the combination of the following characteristics: longer and deeper head, longer snout and pectoral fin, deeper caudal peduncle, fewer scales in the E1 series and lower lateral line, preopercular spot absent, bars 6 and 7 separated from longitudinal band and discontinuous longitudinal band. An identification key for species reported from Bolivia and complementary morphological data for B. oenolaemus and B. vittata are presented.
Description of two new species of Bujurquina (Teleostei: Cichlidae) from the Bolivian Amazon
(Figshare (United Kingdom), 2023) M. Careaga; Guido Miranda; Fernando M. Carvajal‐Vallejos
Abstract Two new species of Bujurquina are described from the Bolivian Amazon basin. The first new species inhabits the Beni River drainage and is distinguished from its congeners in the combination of the following characters: longer snout, deeper head, body and caudal peduncle, shorter pectoral fin, more scales in the E1 series, discontinuous longitudinal band, bars 5 and 6 not fused, preopercular spot and coloration pattern on flank scales absent. The second new species inhabits the Mamoré and Iténez river drainages, and differs from its congeners in the combination of the following characteristics: longer and deeper head, longer snout and pectoral fin, deeper caudal peduncle, fewer scales in the E1 series and lower lateral line, preopercular spot absent, bars 6 and 7 separated from longitudinal band and discontinuous longitudinal band. An identification key for species reported from Bolivia and complementary morphological data for B. oenolaemus and B. vittata are presented.
Early Biogeography of Otophysi Points to the Neotropics as the Cradle of Characiphysan Fishes
(Wiley, 2025) Achille Lenglin; Max Hidalgo; Guido Miranda; A. Sota; Pierre Caminade; Khalid Belkhir; Olga Otero; Pierre‐Olivier Antoine; Carmen Rosa GARCÍA-DÁVILA; Nicolas Hubert
Freshwaters represent less than 1% of Earth's surface and only 0.02% of the available aquatic habitable volume, yet they host nearly half of the 35,500 known species of bony fishes. Ostariophysan fishes account for 70% of all freshwater fish diversity, comprising approximately 12,000 species across five highly speciose orders. They represent a major evolutionary radiation, the internal phylogenetic relationships of which remain the subject of intense debate. To better understand their early evolutionary history and origin, we reconstructed their phylogeny using dense taxonomic sampling and a combined dataset of complete mitochondrial genomes and sequences from four nuclear genes. Phylogenetic relationships and divergence times were inferred using Bayesian and Maximum Likelihood approaches and molecular dating analyses on a dataset of 687 ostariophysan species, comprising 21,701 aligned positions, including 15,707 variable sites. We also applied model-based Maximum Likelihood ancestral area reconstruction to investigate the early evolutionary history of Otophysi. Our analyses yielded a highly supported phylogenetic hypothesis for Otophysi, highlighting the role of plate tectonics in driving multiple divergence events, along with subsequent range shifts. These findings are further supported by the contraction of the tropical belt, which began at the end of the Cretaceous and continued throughout the Paleogene. Our results support the divergence of Cypriniformes and Characiphysi as a consequence of the breakup of Laurasia and Gondwana. The origin of Characiphysi is traced to West Gondwana, and the subsequent expansion of the group cannot be explained without invoking transcontinental dispersal during the Upper Cretaceous-Paleocene.
Ecomorphological variations of Orestias sp. (gr agassizii, Cyprinodontiformes, Cyprinodontidae) from Eastern slope of the Andes
(2021) Erick Loayza; Débora Alvestegui; Kelvin Herbas; Carla Ibañez; Claudia Zepita; Guido Miranda
Estimating the age of the tataruga (Podocnemis expansa) from femur bones in the Iténez River, Beni, Bolivia
(2025) Reinaldo Cholima; Aldo Echeverria; Bram Cornelis de Vries Robbé Akkersdijk; Guido Miranda
The South American river turtle or tataruga (Podocnemis expansa), distributed throughout the Amazon basin, is one of the largest turtle species in the world. It faces several threats that could put its populations at risk. Its distribution, abundance, and diet are well described, but not much is known about its population structure. To understand the growth pattern of this species, we investigated the relationship between carapace length and age in the turtles through a skeletochronological study. Femur samples were obtained from subsistence hunting in the community of Versalles, on the Iténez River in Bolivia. Incisions were made, and an annuli count was performed to determine the age of the turtles. A von Bertalanffy growth curve was then constructed relating age to carapace length. A total of 20 femurs were analyzed, and a higher growth rate was found during the first years of life in female turtles from the study population. Skeletonchronology is shown to be useful for assessing the growth and population structure of the turtles. However, the population range needs to be expanded to obtain more information on juveniles and mature males.
First observations on annual massive upstream migration of juvenile catfish Trichomycterus in an Amazonian River
(Springer Science+Business Media, 2015) Guido Miranda; Gustavo Álvarez; V. Alejandra Sierra Luna; Robert B. Wallace; Lilian Painter
Ichthyofauna (Osteichthyes, Actinopterygii) from tributaries of the Beni and Mamor&eacute; rivers in the Llanos de Moxos wetland of the Bolivian Amazon
(Pensoft Publishers, 2025) Takayuki Yunoki; Aldo R. Echeverria; Reinaldo B. Cholima; Guido Miranda; Federico Moreno
We conducted ichthyological surveys in the Biata, Geneshuaya, Benicito, and Yata Rivers, as well as Dos Naciones Lagoon. We recorded 182 species, including new records for Bolivia, such as Jupiaba citrina Zanata & Ohara, 2009, Moenkhausia melogramma Eigenmann, 1908, Spinipterus cf. acsi Akama & Ferraris, 2011, Tatia cf. gyrina (Eigenmann & Allen, 1942), Cetopsidium orientale (Vari, Ferraris & Keith, 2003), Nemuroglanis cf. furcatus Ribeiro, Pedroza & Rapp Py&#8209;Daniel, 2011, and Batrochoglanis melanurus Shibatta & Pavanelli, 2005. Most of these species, reported for the first time in Bolivia, were previously collected in black&#8209;clear water streams located in the Upper Amazon and/or the lowlands around the Guiana Shield and Brazilian Shield, far from the study area.&nbsp;
Ichthyofauna of the megadiverse Madidi National Park in the Bolivian Andean Amazon
(2022) Guido Miranda
This study presents the results of a compilation of the existing fish records for the Madidi National Park and Natural Area for Integrated Management (PNANMI Madidi), as well as extensive ichthyological sampling by the Identidad Madidi expedition, and species identified in ichthyoplankton by the metabarcoding approach. The current list has a total of 333 species for the protected area, across 43 families and within 13 orders. The list also includes 35 new candidate species still to be described. The highest number of species is found within the order Characiformes (139 species; 41.7%), followed by Siluriformes (137 species; 41.1%), and Cichliformes (19 species; 5.7%), which together represent 88.6% of total species richness. The remaining species (11.4%) are distributed across another 10 orders. The families with the highest number of species are Characidae (73 species; 21.9%), Loricariidae (36; 10.8%), Heptapteridae (21; 6.3%), Pimelodidae (21; 6.3%), and Cichlidae (19; 5.7%). The list of 333 species presented here doubles the previously known ichthyofauna (161 species) in the PNANMI Madidi. The area covers 1.3% of the Madeira basin, but conserves 25% of the Ictiofauna del megadiverso Parque Nacional Madidi en los Andes Amaznicos de Bolivia known species in the basin. Similarly, PNANMI Madidi covers 1.8% of Bolivian territory, and conserves almost 40% of known Bolivian ichthyofauna.
Importance of Primates to Tacana Indigenous Subsistence Hunting in the Bolivian Amazon
(Springer Nature, 2020) Wendy R. Townsend; Robert B. Wallace; Kantuta Lara-Delgado; Guido Miranda
Low total mercury in Caiman yacare (Alligatoridae) as compared to carnivorous, and non-carnivorous fish consumed by Amazonian indigenous communities
(Elsevier BV, 2016) Sofía Rivera; Luis F. Pacheco; Darío Achá; Carlos I. Molina; Guido Miranda
Monitoring native killifish in the La Paz metrópolis by citizen scientists: advantages and opportunities
(2022) Erick Loayza; Guido Miranda; Guido Miranda-Chumacero
The Metropolitan Region of La Paz (MRDLP) in Bolivia has grown with minimal planning, leading to major changes to the natural habitat. Currently, citizen science is becoming an important contributor of information on the biodiversity of urban areas. This study presents novel records of native Andean killifish (Orestias spp.) in the MRDLP obtained from the iNaturalist website, expanding its distribution and highlighting the important role of citizen participation as a tool to expand biodiversity knowledge and monitoring of ecosystems sensitive to climate change.
Morphology and reproduction of the cavefish Trichomycterus chaberti and the related epigean Trichomycterus cf. barbouri
(Wiley, 2003) Marc Pouilly; Guido Miranda
Hypogean and epigean populations of Trichomycterus catfishes inhabit streams from different environments (cave, headwater, canyon and valley) in the Torotoro National Park in the Andes, Bolivia. A significant reduction in the diameter of the eyes and in the surface area of the mesencephalon was observed in subterranean populations, along with an increase in the surface area of the telencephalon. Contrary to expectations, the barbel did not appear to be longer in hypogean populations. The observed pattern of modification of the other variables (pigmentation, eye asymmetry, surface area of the cerebellum and rhombencephalon, fecundity and egg diameter) corresponded to a gradient of values from valley to canyon, headwater and subterranean populations. This result argues not for a simple distinction between epigean and hypogean populations but for an adaptation to an environmental gradient of constraints in which caves correspond to an extreme situation.
Preferential Liver Accumulation of Mercury Explains Low Concentrations in Muscle of Caiman yacare (Alligatoridae) in Upper Amazon
(Springer Science+Business Media, 2021) Andrea C. Salazar-Pammo; Darío Achá; Guido Miranda
Revealing capture sites and movements by strontium isotope analyses in bones of Caiman yacare in the Beni river floodplain, Bolivia
(2021) Marc Pouilly; Sergio Gómez; Christophe Pécheyran; Sylvain Bérail; Gustavo Álvarez; Guido Miranda
ABSTRACT Studying the distribution of organisms and their movements is fundamental to understand population dynamics. Most studies indicated that crocodilians do not move around much but several studies demonstrated that some species showed movement patterns. Detection of these movements along the individual life is still a challenge. In this study we analyzed the variation of strontium isotopic ratio ( 87 Sr /86 Sr) in the femur bones of 70 Caimanya care individuals caught in 16 sites located in five hydrological sectors of the Beni river floodplain in Bolivia. Our results demonstrated for the first time that such a methodology could yield indications about the capture sites and reconstruct individual life history. Analyses of the outer part of the femur of 70 individuals showed that capture sites could be differentiated between sectors and even between sites or groups of sites in each sector. Studies of complete 87 Sr /86 Sr profiles along the femur, representing the individual’s entire life, were performed on 33 yacares. We found that most of the individuals did not show any significant isotopic variation throughout their lives. This absence of variation could result from a high fidelity to the birth site, and/or from an insignificant isotopic variation between the water bodies through which the animal has potentially moved. However, 24% of the analyzed individuals presented significant variations that can be considered as movements between different habitats. Based on the observed low proportion of moving yacares, we advocated that each water body should be considered an individual management unit.
Review of Fisheries Resource Use and Status in the Madeira River Basin (Brazil, Bolivia, and Peru) Before Hydroelectric Dam Completion
(Taylor & Francis, 2018) Carolina Rodrigues da Costa Dória; Fabrice Duponchelle; Maria Alice L. Lima; Aurea Rosa GARCÍA-VÁSQUEZ; Fernando M. Carvajal‐Vallejos; Claudia Coca Méndez; M. F. Catarino; Carlos Edwar de Carvalho Freitas; Blanca Vega; Guido Miranda
The Madeira River, which drains one of the major tributary river basins of the upper Amazon, contributes to small-scale fisheries in Peru, Bolivia, and Brazil. This paper provides a base-line of fisheries resources and their status in six sub-basins of the Madeira River: upper Madre de Dios River basin (Peru), Beni and Mamoré River basins (Bolivia), Iténez or Guaporé River basin (Bolivia and Brazil), middle Madeira, and (two sections of the) lower Madeira River (Brazil). Data were collected between 2009 and 2011, before the completion of two hydroelectric dams in the Brazilian portion of the basin. Biophysical, social, and biological indicators were used to characterize the fisheries. The results show an overall small-scale multispecies fisheries pattern but with notorious differences between the Madeira sub-basins. The Beni and Mamoré sub-basin shows the largest flooded area, with associated higher total fisheries yields. Trophic level of the catch, diversity, and mean weight of fish caught were shown to be very sensitive to exploitation level, river water type (white or clear water), flooded area, and the introduction of Arapaima gigas in Bolivia. The Bolivian fisheries are characterized by less exploited stocks, whereas stocks in Peru and Brazil show signs of intensive exploitation, resulting in fisheries of smaller bodied, lower trophic-level species. Landing data in the upper basin show a predominant reliance on migrating fish resources, which might be vulnerable to the construction of dams. These data serve as a baseline to evaluate anthropogenic impacts on the Madeira River basin fisheries in the future.
Strontium isotope analyses in femur bones of Caiman yacare from the Beni river floodplain (Bolivia)
(European Organization for Nuclear Research, 2021) Marc Pouilly; GOMEZ Sergio; Christophe Pécheyran; Sylvain Bérail; ALVEREZ Gustavo; Guido Miranda
Excel file of data used in Pouilly M. , Gomez S., Pécheryan C., Bérail S., Alvarez G. and Miranda-Chumacero. 2021. Revealing capture sites and movements by strontium isotope analyses in bones of Caiman yacare in the Beni river floodplain, Bolivia. BioRxiv Preprint, https://doi.org/10.1101/2021.04.14.439857 Complete profiles of 87Sr/86Sr were performed from the core to the external border of the femur bone of 33 yacares. Sr isotope ratio (87Sr/86Sr) profile of variation was obtained by a continuous analysis (LA - MC - ICPMS) on a transect perpendicular to growth marks running from the femur center (corresponding to the beginning of life) to the bone external border (corresponding to the capture period). First line of the table indicate sample name (detailled in the 'cod' sheet) First column corresponds to the distance form the center of the bone (in micrometer) Following columns correspond to the 87Sr/86Sr profil (one value by distance) for each sample (yacare individual)