Papers by Edson Guilherme
Acta Amazonica, Mar 1, 2021
Although Brazil has one of the highest scorpion diversities worldwide, the scorpion fauna of the ... more Although Brazil has one of the highest scorpion diversities worldwide, the scorpion fauna of the Amazon region remains relatively poorly described. In this study, we updated the list of scorpion species from the state of Acre, in the southwestern Brazilian Amazon, based on a revision of records contained in Brazilian arachnid collections and a survey of the relevant literature. We recorded the occurrence of seven scorpion species belonging to two families (Buthidae and Chactidae) among which we report three new records (Ananteris sp., Tityus (Tityus) gasci, and Chactopsis cf. insignis) for Acre. The results presented herein make an important contribution to the knowledge on scorpion diversity in the Amazonian forests of Acre.
International journal of acarology, Nov 16, 2020
De acordo com o art. 28 da IN 03/2014, esta autorização tem prazo de validade equivalente ao prev... more De acordo com o art. 28 da IN 03/2014, esta autorização tem prazo de validade equivalente ao previsto no cronograma de atividades do projeto, mas deverá ser revalidada anualmente mediante a apresentação do relatório de atividades a ser enviado por meio do Sisbio no prazo de até 30 dias a contar da data do aniversário de sua emissão.
Semina-ciencias Agrarias, Aug 7, 2020
Bird species of the order Passeriformes were the most infested by ticks. New bird species-hosts o... more Bird species of the order Passeriformes were the most infested by ticks. New bird species-hosts of Amblyomma ticks in the state of Acre. Unpublished records of Amblyomma humerale and Amblyomma nodosum parasitizing new bird species.
Revista Peruana de Biología, Jul 6, 2019
Bulletin of the British Ornithologists’ Club
BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
51st Annual GSA South-Central Section Meeting - 2017, 2017
Journal of Field Ornithology, 2023
Studies on bird assemblage structure in pioneer environments allow us to understand the use of sp... more Studies on bird assemblage structure in pioneer environments allow us to understand the use of space, distribution patterns, ecosystem services, and population dynamics of these ephemeral habitats. However, studies on the bird community related to these types of habitats in the southwest of the Brazilian Amazon are rare. We compared the bird assemblage structure of an area dominated by embaúbada-várzea (Cecropia membranacea Trécul) with the adjacent alluvial rainforest along the Chandless River, a right-margin tributary of the Purus River, in the southwest Brazilian Amazon. Birds were captured with mist nets and banded (with a metal ring) along trails in both habitats. The following environmental variables were measured: temperature, humidity, and canopy openness. Understory bird assemblage was similar in the two habitats, with no influence from the environmental variables sampled. Average similarity of understory species composition between the two habitats was 77.6%, Pipra fasciicauda being the species that most contributed to this similarity (10.76%). Despite their almost homogeneous canopy and inconspicuous understory composed of short life cycle plants, due to the impact of river dynamics, areas dominated by C. membranacea have an understory bird assemblage composition similar to that of the adjacent alluvial rainforest. Understory species move horizontally and easily between these two habitats. Habitats dominated by C. membranacea on the lower Chandless River, contrary to expected, harbor a rich bird fauna. Given its importance to biodiversity maintenance, the protection of this habitat is recommended, as well as the undertaking of further biological studies on this unique Amazonian ecosystem. RESUMEN. Los estudios sobre la estructura del ensamble de aves en ambientes pioneros nos permiten comprender el uso del espacio, los patrones de distribución, los servicios ecosistémicos y la dinámica poblacional de estos hábitats efímeros. Sin embargo, son raros los estudios sobre la comunidad de aves relacionada con este tipo de hábitats en el suroeste de la Amazonia brasileña. Comparamos la estructura del ensamble de aves de un área dominada por embaúba-da-várzea (Cecropia membranacea Trécul) con la selva aluvial adyacente a lo largo del río Chandless, un afluente del margen derecho del río Purus, en el suroeste de la Amazonia brasileña. Las aves fueron capturadas con redes de niebla y anilladas (con un anillo metálico) a lo largo de senderos en ambos hábitats. Se midieron las siguientes variables ambientales: temperatura, humedad y apertura del dosel. El ensamble de aves del sotobosque fue similar en los dos hábitats, sin influencia de las variables ambientales muestreadas. La similitud media de la composición de especies del sotobosque entre ambos hábitats fue del 77,6%, siendo Pipra fasciicauda la especie que más contribuyó a esta similitud (10,76%). A pesar de tener un dosel casi homogéneo y un sotobosque poco visible compuesto por plantas de ciclo vital corto, debido al impacto de la dinámica fluvial, las áreas dominadas por C. membranacea tienen una composición de aves del sotobosque similar a la de la selva aluvial adyacente. Las especies del sotobosque se mueven en sentido horizontal y fácilmente entre estos dos hábitats. Los hábitats dominados por C. membranacea en la parte baja del río Chandless, al contrario de lo esperado, albergan una rica avifauna. Dada su importancia para el mantenimiento de la biodiversidad, se recomienda la protección de este hábitat, así como la realización de nuevos estudios biológicos sobre este ecosistema amazónico único.
Community Ecology, Jul 29, 2021
The ongoing deforestation in southwestern Brazilian Amazonia is transforming the region’s landsca... more The ongoing deforestation in southwestern Brazilian Amazonia is transforming the region’s landscape into a mosaic of forest fragments. The bamboo forests are threatened by the fragmentation and replacement of natural habitats due to anthropogenic activities. The bird fauna found in forest fragments and habitats dominated by bamboo is under the constant threat of local extinction due to the increasing isolation of populations. In the present study, we compared the structure of the understory bird communities (a) between an urban fragment and two rural fragments, and (b) between adjacent bamboo and non-bamboo habitats. We captured the birds in mist-nets, banded each individual, and georeferenced the capture sites. The results of the study indicate that the structure of the understory bird community varies both among the fragments and between bamboo and non-bamboo habitats. Most birds species are found in both types of habitats, although the structure of the bird community differs between habitats, due to the presence of specialist species to bamboo habitats. The structure of the bird community in each forest fragment is unique, and this must be taken into account in the formulation of strategies for the conservation and management of the region’s biodiversity.
Acta Veterinaria Brasilica, Dec 22, 2017
The aim of this work was to describe an eyelid neoplasm in wild birds, since the veterinary liter... more The aim of this work was to describe an eyelid neoplasm in wild birds, since the veterinary literature has little information concerning the aspects of the oncologic clinic in wild species. In the clinical exam, it was observed a single mass in the upper right eyelid of the Pheugopedius genibarbis a, with rough surface, cauliflower aspect, of dark-red coloration. For the histopathological diagnosis, an incisional biopsy of the lesion was done , with the fragment fixed in 10% buffered neutral formalin, processed by the method of inclusion in paraffin , cut to 4µm sections and stained with H&E. The histopathological findings revealed elongated dermal papillae covered by acanthotic epidermis, as well as thickness of the stratum spinosum. In the stratum spinosum, it was observed the presence of cells with vacuolated cytoplasm and nucleus slightly dislocated to the center of the cell, which increases in proportion when closer to the granular layer, an indication of hydropic degeneration, there were In the basal layer it is possible to notice the presence of the normal mitotic figures. Based on the macro and microscopic characteristics, that neoplasm was diagnosed as an eyelid papilloma.
Check List, Nov 1, 2013
The objective of this study is to report seven decapod crustacean species for the first time from... more The objective of this study is to report seven decapod crustacean species for the first time from Sergipe state, northeastern Brazil. The specimens were sampled from January 2012 to June 2015, on continental shelf and estuaries. Alpheus buckupi, Synalpheus ul, Lysmata bahia, L. cf. intermedia, Paguristes tortugae, Macrocoeloma laevigatum and Pilumnoides coelhoi are reported. This study records fill gaps in the geographical distribution of these decapods that have previous records for adjacent areas.
Acta Amazonica, Sep 1, 2021
The southern lapwing, Vanellus chilensis, is a bird frequently seen in most of Brazil. Although i... more The southern lapwing, Vanellus chilensis, is a bird frequently seen in most of Brazil. Although it is widely distributed in other Brazilian biomes, including some parts of the Brazilian Amazon, it has only been recorded in the western Amazonian state of Acre since 2000. We report the presence of intestinal parasites in individuals of V. chilensis from the Cazumbá-Iracema Extractive Reserve in Acre through a coproparasitological analysis. Seven of the nine sampled individuals were parasitized. We observed larvae of Strongyloides sp. (28.5% of the samples), and eggs of Ascaridia sp. (28.5%), Ancylostoma sp. (14.2%), and Choanotaenia sp. (42.8%). These parasites are reported for the first time parasitizing V. chilensis in Brazil. The parasitized birds may act as reservoirs and were recorded in a peridomicile area, which may facilitate their contact with domestic birds.
Acta Scientiarum. Biological Sciences, Aug 27, 2020
Seed dispersal is one of the principal ecological processes that determine the richness and distr... more Seed dispersal is one of the principal ecological processes that determine the richness and distribution of plants in tropical forests. Birds play an important role in the zoochoric dispersal of seeds in these forests. The present study investigated the bird-plant interactions involving the ingestion and dispersal of seeds by the birds found in the edge habitat of an isolated forest fragment on the Catuaba Experimental Farm in eastern Acre, in southwestern Brazilian Amazonia. The birds were captured using mist nets, and the seeds were collected from fecal samples obtained during the handling of the animals. These seeds were sorted and identified. The bird and the plant species identified during the study were used to calculate the connectivity and nestedness of the bird-plant interactions. We captured 82 species of birds, with a total sampling effort of 203,180 h.m². Fecal samples obtained from 19 of the bird species contained a total of 2,086 seeds, representing 23 plant species. The interaction network had an intermediate connectance, and significant nestedness. Ramphocelus carbo had the highest importance index and was the bird with the largest number of plant interactions, while Cecropia latiloba was the plant with the highest importance index, followed by Schefflera morototoni. Most of the seed-dispersing birds identified in the present study are generalists found in both the forest core and its edge. The results of the study indicated that the community of generalist-frugivore birds interacts extensively with the plant community of the fragment, providing seed dispersal services that include the deforested areas adjacent to the fragment.
Revista Brasileira de Ornitologia - Brazilian Journal of Ornithology, Mar 1, 2014
Amana National Forest (FLONA Amana) is located on the left bank of the middle Tapajós River, in t... more Amana National Forest (FLONA Amana) is located on the left bank of the middle Tapajós River, in the interfluve of the Tapajós and Madeira Rivers, state of Pará, Brazil. I performed a "Rapid Ecological Assessment" (REA) on the bird communities of the park to identify important areas for avian conservation and areas where activities could impact bird communities. Field surveys were carried out at the end of the rainy season and at the beginning of the dry season. Nine points distributed among five sites were sampled within Amana or very close to its borders. Three approaches were used to survey the avifauna of each point: (a) a quantitative approach using mist nets, (b) a qualitative approach using field observations with binoculars, and (c) interviews with local residents. With a sampling effort of 3,320 net hours, interviews with local residents, and approximately 60 additional hours of visual observations, 247 species of birds were recorded belonging to 51 families. Eight taxa are considered endemic to the interfluve of the Tapajós/Madeira Rivers. Two species are on IUCN's Red List of endangered birds (Penelope pileata and Guaruba guarouba), and the known distribution of two species (Topaza pella and Discosura longicaudus) is extended by our surveys. Two activities within Amana were detected to have possible negative impacts on avifauna, specifically hunting and gold and cassiterite mining.
Brazilian Journal of Botany, Oct 23, 2020
Artificial perches can provide an important supply of seeds and contribute to ecological restorat... more Artificial perches can provide an important supply of seeds and contribute to ecological restoration. In the present study, we verified the effectiveness of artificial perches for the dispersal of seeds in an area of the southwest Brazilian Amazon. We conducted the study on the Catuaba Experimental Farm in State of Acre, Brazil, from March 2016 to March 2017. We installed seed traps with artificial perches and control traps at different distances from the adjacent forest. We collected 19,865 seeds in boxes under the artificial perches and 1300 in the control traps. There was greater richness of plant species and abundance of seeds in the boxes under the artificial perches when compared with the control traps. The artificial perches at a distance of 40 m from the adjacent forest presented a greater species richness and distinct composition of plants. The quantity of dispersed seeds did not correlate with precipitation, although there was a correlation between rainfall and the fresh seed mass. The artificial perches were efficient at dispersing seeds and are a low-cost technique that can be used as a strategy for the regeneration of forests in degraded areas.
Papéis Avulsos de Zoologia, Feb 18, 2021
Birds are the best-known vertebrate group, although many localities in the world are considered t... more Birds are the best-known vertebrate group, although many localities in the world are considered to be knowledge gaps. This is the case of many little-known environments in the Amazon biome, the world's largest tropical forest. Here, we present a survey of birds in the upper Purus basin, comprising the municipalities of Manoel Urbano and Feijó in the Brazilian state of Acre, and Boca do Acre and Pauini in the state of Amazonas. In this region, poorly-studied habitats, such as open rainforest dominated by palms or bamboo, still predominate. We recorded 452 bird species during 45 field trips between May and July in 2016, and June to August in 2017. Twenty-four of these species are associated with bamboo habitat, 28 are endemic to the southwestern Amazon basin, and seven are threatened with extinction. This high diversity is typical of the western Amazon basin, one of the richest regions in the world in the number of species, due to the heterogeneity of the local environments. The data presented here highlight the importance of the region for the conservation of birds, including species typical of the western Amazon, some of which are still poorly-known.
Arquivos de Ciências Veterinárias e Zoologia da UNIPAR, 2017
Acta Arachnologica, Aug 31, 2018
The genus Chactas Gervais 1844 belonging to the family Chactidae Pocock 1893 is characterized by ... more The genus Chactas Gervais 1844 belonging to the family Chactidae Pocock 1893 is characterized by 4 to 6 trichobothria on the ventral aspect of patella, and fixed finger of chela without an extra-large accessory tooth; male pedipalps very long and slender compared to those of females (Lourenço & Dastych 2001). This Neotropical scorpion genus occurs exclusively from Central to South America (Lourenço 1991; Teruel & Cozijin 2011), and in the Caribbean Islands (Francke & Boos 1986). Currently, most of species being found in Colombia and Venezuela (González-Sponga 1996; Lourenço 1997). Few species are known from other South American countries (Rossi 2014). This genus was originally described by Gervais (1844) for Chactas vanbenedenii (Gervais 1843) from Colombia. According to Lourenço (2014), morphological diagnosis of Chactas species is rather difficult, mainly because several species are extremely similar. Thus, the taxonomic resolution of Chactas has been the subject of constant debate (Lourenço 2014). Kraepelin (1912) revised the genus proposing the existence of three natural groups of species within Chactas. Later, Mello-Leitão (1945) raised these groups to the subgenera rank. In 1978, González-Sponga proposed the creation of two new subgenera on the basis of the relative number of trichobothria. However, Lourenço (1997) suggested that the variation in this single character is not sufficient for the division of the genus into subgenera. Despite Brazil's vast area, only a single Chactas species, Chactas braziliensis, has been recorded in the country. This species was described on the basis of four female individuals collected from the western portion of Amazonas state in the Amazon Basin (Lourenço et al. 2005). To date, males of this species remain unknown. Recently a chactid scorpion collected in the Parque Nacional Serra do Divisor, Acre, near the Peruvian border in 2001 was sent to the Universidade Federal de Pernambuco in Recife, Brazil, and it was identified as a male of Chactas braziliensis. The male of this species is described for the first time in this paper. Materials and methods Measurements were taken using a digital caliper and are given in mm. Photos were taken using a DSLR Nikon D5500 with an 18-55 mm Nikkor lens and an attached Raynox DCR-250 lens. Drawings were prepared by using photographs taken on Inkscape 0.92, using a Wacom MTE-450 Bamboo tablet. The morphological terminology mostly follows Ochoa et al. (2010; 2013). The material examined is deposited in the Arachnological collection of the Universidade Federal de Pernambuco, Recife, Brazil. Comparisons with C. braziliensis were made through a holotype high definition photos and other Chactas species were made through the revision of the bibliography.
Anuário do Instituto de Geociências, 2011
This study presents an almost complete mandible of Octodontobradys sp. from the late Miocene-Plio... more This study presents an almost complete mandible of Octodontobradys sp. from the late Miocene-Pliocene of the Solimões Formation from a locality on the border between Brazil and Bolivia, in southwestern Amazonia. The two almost complete mandibular rami, together with fragments of fossils from other taxa, were found on the left bank of the Abunã River, upriver from the town of Plácido de Castro, in the Brazilian state of Acre. The form of the symphyseal region of the mandible, and the elongated and bilobated outline of the alveoli of the m2-3-4 molariforms place the specimen clearly in the genus Octodontobradys. However, the new specimen differs from O. �uruensis in (a) the anterior position of the posterior external aperture of the mandibular canal, and (b) the wider and more anteriorly inclined symphyseal region. The mandible described here represents the first specimen of the genus Octodontobradys found outside of the holotype locality, Talismã, in the Brazilian state of Amazonas and enabled us to emend the diagnoses of Subfamily Octodontobradyinae.
PALAIOS, Aug 31, 2021
ABSTRACTThe Niterói and Talismã sites comprise two of the most important fossiliferous deposits o... more ABSTRACTThe Niterói and Talismã sites comprise two of the most important fossiliferous deposits of the Neogene in Brazil. After 30 years of research, these sites have revealed rich assemblages of vertebrates and provided a glimpse of the Amazonian fauna and environment during the Miocene. Despite this, detailed studies that attempt to explain the genesis of these bonebeds are still scarce and hamper more robust paleoenvironmental and paleoecological reconstructions. Here we provide the first in-depth taphonomic analysis for both locations. Sedimentological and taphonomic evidence suggest that the depositional environments of Niterói and Talismã were similarly represented by shallow and calm waters in lacustrine/swampy contexts. We propose that the accumulation of bones and teeth is the result of attritional (day-to-day) mortality of organisms of the local community in a low sedimentation environment. The thanatocoenosis was exposed to biostratinomic processes for longer periods of time, which explains the high disarticulation, disassociation, fragmentation and loss of skeletal elements. The almost absence of weathering indicates that the aquatic environment slowed down the organic degradation of bioclasts, while the rarity of abrasion shows a limited influence of hydraulic flows in transporting and remobilizing bioclasts. Thus, both sites preserve mostly autochthonous to parautochthonous bioclasts, with a moderate level of time-averaging. Our results corroborate the hypothesis that lentic environments can present remarkable preservational conditions for the formation of attritional accumulations of vertebrate remains. Moreover, we show how the different collecting methods affect the description of preservational features and taphonomic interpretations of both fossil assemblages.
Uploads
Papers by Edson Guilherme