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2008
ABSTRACT We studied the potential role as seed disperser of the pacu fish (Piaractus mesopotamicus, Characidae) in the Pantanal of Brazil. The most important food item in the diet of the pacu in the wet season was fruits of the palm Bactris glaucescens found in the guts of 73 percent of all fishes collected (N= 70). We found a positive relationship between fish length, weight, and gape size and the number of intact seeds in their gut. Therefore, large pacus are especially important in dispersing B.
2008 •
Flowering and fruiting phenology of Bactris glaucescens (tTucum), its fruit consumption by Piaractus mesopotamicus (Ppacu), and the possible dispersal of its diaspores were observed in riparian forests and nearby places of a secondary channel of Rio Paraguai. Between February and October of 1998, 136 individuals of Piaractus P. mesopotamicus were collected and gut contents were analyzed to verify the presence of Bactris B. glaucescens diaspores. The seeds found were tested in tetrazolium solution to verify their viability. The feeding index of the diet components was calculated. Phenological observations were accomplished in 40 Palm trees. A total of 127 diaspores of Bactris B. glaucescens were found in the guts of the fish, 80 of which were tested, with 67,5% of viable seeds. The feeding index for Bactris B. glaucescens varied through the year, reaching more elevated values at the time of the fruiting phenology peak, which occurs at the same time in which the water level is increas...
Journal of Tropical Ecology
Seed dispersal by the fishPterodoras granulosusin the Paraná River Basin, Brazil1994 •
Tropical Conservation Science
Viability of Seeds Consumed by Fishes in a Lowland Forest in the Brazilian Central AmazonActa Oecologica-international Journal of Ecology
Seed dispersal by fishes in tropical and temperate fresh waters: The growing evidence2011 •
2009 •
Frugivory and seed dispersal have been poorly studied in Neotropical freshwater fishes. We studied frugivory and seed dispersal by the piraputanga fish (Brycon hilarii, Characidae) in the Formoso River, Bonito, western Brazil. We examined the stomach contents of 87 fish and found the diet of piraputanga consisted of 24% animal prey (arthropods, snails, and vertebrates), 31% seeds/fruits and 45% other plant material (algae/macrophytes/leaves/flowers).
Neotropical Biology and Conservation
Diet and seed dispersion of the crab-eaten fox, Cerdocyon thous (Linnaeus, 1766) in Restinga de Jurubatiba National Park, Rio de Janeiro State, Brazil2010 •
Proceedings of the Royal Society B: Biological Sciences
Extremely long-distance seed dispersal by an overfished Amazonian frugivore2011 •
Throughout Amazonia, overfishing has decimated populations of fruit-eating fishes, especially the large-bodied characid, Colossoma macropomum . During lengthy annual floods, frugivorous fishes enter vast Amazonian floodplains, consume massive quantities of fallen fruits and egest viable seeds. Many tree and liana species are clearly specialized for icthyochory, and seed dispersal by fish may be crucial for the maintenance of Amazonian wetland forests. Unlike frugivorous mammals and birds, little is known about seed dispersal effectiveness of fishes. Extensive mobility of frugivorous fish could result in extremely effective, multi-directional, long-distance seed dispersal. Over three annual flood seasons, we tracked fine-scale movement patterns and habitat use of wild Colossoma , and seed retention in the digestive tracts of captive individuals. Our mechanistic model predicts that Colossoma disperses seeds extremely long distances to favourable habitats. Modelled mean dispersal dista...
Revista de Biologia Tropical
LUQUE & PINILLA_2019_Juveniles of the overexploited Amazonian fish Colossoma macropomum (Characiformes: Serrasalmidae) as potential seed dispersers of Cecropia spp.Colossoma macropomum is a frugivorous fish from the Amazon and Orinoco river basins. This species has an important economic and social role in both river watersheds; it also has been overfished for more than 40 years, leading to changes in the populations structure. Currently adults are less common in fisheries, while juveniles are more frequently fished and sold in several market places along the Amazon River. Reportedly adult individuals consume a vast quantity of fruits and seeds and has been recognized as effective seed dispersers that plays a significant ecological role. Although frugivorous fishes are important dispersers in tropical rainforests, assessments of their effectiveness in dispersing seeds and in the effect on the germination of these ingested seeds are still insufficient. Cecropia latiloba and Cecropia membranacea are two pioneer tree species that initiate the succession process in the tropical forest and are both widely consumed by C. macropomum. In this study we aimed to verify if the Cecropia seeds that pass through the digestive tract of juveniles of C. macropomum would show improved germination. The results obtained through controlled experiments confirm that seeds that pass through the digestive tract of C. macropomum retained their germination capacity. Although the responses in the improvement of the germination variables (germination capacity, minimum imbibition time, time necessary for reaching 50 % germination capacity, emergence velocity index and germination mean time) did not show statistical differences between treatments, the seedlings that grew from the seeds consumed by the fish were taller than those without the digestive treatment. We conclude that juveniles of C. macropomum have the possibility to disperse the seeds of these Cecropia species.
Studies on Neotropical Fauna and Environment
Seed dispersal and predation in the palm Syagrus romanzoffiana on two islands with different faunal richness, southern Brazil2011 •
Palms are considered key species in tropical forests and represent a source of food for the community of frugivores in times of scarcity. Palms have also been used as a model to investigate how the processes of dispersal and seed predation are affected by fragmentation and alteration of tropical forests. This study examines the dispersal and seed predation of Syagrus romanzoffiana in two insular environments of different sizes (1500 ha and 50 ha) and faunal compositions, both located in the Brazilian Atlantic rainforest in Santa Catarina State, Brazil. We recorded 13 species of animals considered consumers and dispersers of fruits and seeds of S. romanzoffiana at the larger study area (Peri Lagoon Municipal Park, Santa Catarina Island) and five species on Campeche Island. In these areas, the rates of dispersal were high (Peri 57.5% to 75.5% and Campeche 81.5% to 93.0%, based on the removal experiments). In the smaller area, despite the low faunal richness, the coatis (Nasua nasua), introduced in the island were important seed dispersers. Only in Peri occurred predation by rodents (rates of 4%) due to the presence of agoutis (Dasyprocta azarae) and there was no post-dispersal predation by insects. The greatest loss of seeds (52% in both locations, based on sampling of seeds accumulated under parent plants) were caused by predation of Revena rubiginosa (Coleoptera, Curculionidae), of which oviposition occurs in the pre-dispersal phase. Besides this factor, about 40% of the seeds showed up without endosperm. However, high seed production seems to compensate for these losses, with significant seedling stock of S. romanzoffiana in both areas.Palmeiras são consideradas espécies-chave em florestas tropicais representando fonte de alimento para a comunidade de frugívoros em épocas de escassez. Palmeiras também têm sido usadas como modelo de estudo na avaliação de como os processos de dispersão e predação de sementes são afetados pela fragmentação e alteração das florestas tropicais. Este estudo examina a dispersão e predação das sementes de Syagrus romanzoffiana em dois ambientes insulares de diferentes tamanhos (1500ha e 50ha) e composições faunísticas, ambos localizados em área de Mata Atlântica no Estado de Santa Catarina, Brasil. Foram registradas 13 espécies de animais considerados consumidores e dispersores dos frutos e sementes de S. romanzoffiana na maior área estudada (Parque Municipal da Lagoa do Peri, Ilha de Santa Catarina) e cinco espécies na Ilha do Campeche. Nestas áreas, as taxas de dispersão foram altas (Peri 57,5% a 75,5% e Campeche 81,5% a 93,0%, com base em experimentos de remoção). Na menor área, apesar da baixa riqueza faunística, os quatis (Nasua nasua), introduzidos nessa ilha, foram importantes dispersores das sementes. Somente ocorreu predação por roedores no Peri (taxas de 4%) devido à presença de cotias (Dasyprocta azarae) e não houve predação pós-dispersão causada por insetos. A maior perda de sementes (52% em ambas as localidades, com base em amostragem de sementes acumuladas sob plantas-mãe) foi causada por predação de larvas de Revena rubiginosa (Coleoptera, Curculionidae), cuja oviposição ocorre na fase de pré-dispersão. Além deste fator, cerca de 40% das sementes mostravam-se sem endosperma. Contudo, a alta produção de sementes parece compensar essas perdas, havendo expressivo estoque de plântulas de S. romanzoffiana em ambas as áreas.
Solid State Ionics
Hydrothermal synthesis of nanosized BaTiO powders and dielectric properties of corresponding ceramics2005 •
2018 •
1991 •
Journal of Management and Business Innovations
The Influence Of Financial Management Practices, Internal Control System, Human Resources Competency And Information Technology On The Quality Of Mosque Financial Reports In Langsa City2020 •
Information Systems Journal
Innovation among different classes of software development organizations2017 •
2016 •
Revista Vértices
Collaborative Online Media: a new way of making TVMachine Learning: Proceedings of the Tenth International Conference
A Reinforcement Learning Method for Maximizing Undiscounted Rewards1993 •
American Journal of Obstetrics and Gynecology
SARS-CoV-2 infection and subsequent changes in the menstrual cycle among participants in the Arizona CoVHORT study2021 •
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
Biological response to millennial variability of dust and nutrient supply in the Subantarctic South Atlantic Ocean2014 •
Acta Biológica Colombiana
Descriptions of the Larvae of Two Species of Paranomala and One Species of Strigoderma (Coleoptera: Melolonthidae: Rutelinae) from Puebla, Mexico2014 •
European Journal of Organic Chemistry
Synthesis of Novel Cyclic Nitrones with gem‐Difluoroalkyl Side Chains Through Cascade Reactions2020 •
2016 •
JOSTECH: Journal of Science and Technology
Pengembangan Modul Fisika Berbasis REACH Berintegrasi Al-Quran Materi Suhu dan Kalor