Colin Robert Beasley

Federal University of Pará | UFPA · Institute of Coastal Studies (IECOS)

Information on freshwater mussel behavior in the sediment is scarce worldwide, especially in the Amazon. Laboratory experiments were used to measure the responses of the single mussel species Castalia ambigua in relation to combinations of two co-occurring different morphotypes (Morphotype I with an elongated shell and Morphotype II with a rounded...

Information on freshwater mussel behavior in the sediment is scarce in the Neotropics, especially in the Amazon. Laboratory experiments were used to measure the responses of the mussel Castalia ambigua in relation to combinations of two different morphotypes (Morphotype I with an elongated shell and Morphotype II with a rounded shell) and three dif...

Shell shape variation of the freshwater mussel Castalia ambigua in relation to environmental and genetic drivers remains unresolved in South America. Along an increasing upstream to downstream hydrological gradient in the Caeté River, eastern Amazon, Brazil, we evaluated two co-occurring morphotypes of C. ambigua: the first is elongated and compres...

Shell shape variation of the freshwater mussel Castalia ambigua in relation to environmental and genetic drivers remains unresolved in South America. Along an increasing upstream to downstream hydrological gradient in the Caeté River, eastern Amazon, Brazil, we evaluated two co-occurring morphotypes of C. ambigua: the first is elongated and compres...

Aim The variability in density and species diversity of decapod crustaceans was investigated on four islands with different degrees of anthropogenic disturbance around the city of Belém, State of Pará. Methods Samples were obtained from 15 creeks using artisanal traps, every three months between October 2013 and May 2014 on Combu, Onças, Cotijuba a...

Novel insights into habitat suitability for two Unionida freshwater mussels, Castalia ambigua Lamarck, 1819 (Hyriidae) and Anodontites elongatus (Swainson, 1823) (Mycetopodidae), are presented on the basis of hydraulic variables linked with the riverbed in six 500‐m reaches in an eastern Amazonian river basin. Within the reaches, there was strong h...

Mussels provide important ecological functions in freshwater ecosystems but the associations between Amazonian mussels, macroinvertebrate assemblage and habitat quality remain poorly understood. We investigated whether changes in macroinvertebrate assemblage structure and ecological functioning were associated with mussel presence. We compared site...

Mussels have important ecological functions in freshwater ecosystems, but populations are declining in many rivers worldwide. In the Amazon, which is undergoing widespread human-mediated alterations, information on mussel ecology is lacking. We investigated whether declines in mussel density, due to exploitation, are associated with lower macroinve...

Oyster culture has benefited traditional coastal communities along the Amazon macrotidal mangrove coast of Pará state in Brazil since 2006. Currently, seven oyster culture units in five municipalities are expanding production, but with no environmental monitoring, which is important for the control of the impacts of oyster culture on waters as well...

Saltmarshes are coastal plant formations frequently found associated with tropical and subtropical mangroves. Saltmarshes in these regions are subject to a wide array of environmental factors. This vegetation has direct and indirect effects on benthic fauna structure both above and below the sediment surface. This study describes the vertical distr...

Oyster culture activity along the eastern Amazon mangrove coast in Pará state, Brazil, was evaluated using socio-economic data to support its management and future development. Between 2013 and 2014, surveys were carried out in the region's seven oyster culture associations through interviews with the president of each association as well as with 5...

The shells of unionid freshwater mussels are highly morphologically variable, making species identification difficult and thus hampering conservation efforts. Shell shape variation is associated with several factors, of which hydrodynamic variables are the most common. Using geometric morphometrics, shell shape was evaluated on the basis of both ex...

Despite its ecological and economical importance, the Brazilian North Coast (BNC) or Amazonia Ecoregion sensu Spalding et al. (Bioscience 57:573–583, 2007), was poorly studied until the 1980s, when major interdisciplinary coastal research programs began. The Amazon and other major rivers strongly influence the BNC, causing seasonally reduced surfac...

Matéria publicada no WorldFishing & Aquaculture Título: Oyster Culture in Brazil: an emerging sector. Página: 28 a 29 Data: Maio de 2018 – Volume 67 – Issue 4 Local: http://worldfishing.net/ (Aquaculture) Jornalista: Entrevista feita por Bonnie Waycott. Veiculação: Internacional/Impresso & Site http://worldfishing.net/news101/fish-farming/oyster...

Meanders are complex aquatic environments exhibiting different flow and sediment characteristics that influence macroinvertebrate distribution. Differences in macroinvertebrate composition, freshwater mussel density (mainly Castalia ambigua Lamarck, 1819) and habitat variables were investigated, using uni‐ and multivariate analyses, in two zones, t...

Triplodon corrugatus is a freshwater bivalve (Hyriidae) endemic to the Amazon, Orinoco and Tocantins basins, and the Piriá river. Our understanding of hyriid diversity at, and below, the species level, remains poor. The genetic diversity of T. corrugatus from the Tapajós, Amazon, Tocantins, Irituia and Piriá rivers in the north-eastern Brazilian Am...

O texto e o ensaio fotográfio fazem parte da minha tese, defendida em julho de 2017, intitulada “Ostreicultura no Nordeste Paraense: Estado atual e perspectivas para sustentabilidade” sob a orientação do Prof. Dr. Colin Robert Beasley do Programa de Pós-Graduação em Biologia Ambiental (PPBA) do Campus Universitário de Bragança. Essa pesquisa foi fi...

Esse painel foi apresentado no XX Congresso Brasileiro de Engenharia de Pesca que aconteceu no período de 08 a 11 de Outubro de 2017 na cidade de Florianópolis - SC.

Shipping has facilitated dispersion of exotic marine species, the genetic diversity of which may allow determination of their geographic origins. The economically important African brown mussel (Perna perna) is widely distributed along the southeastern and southern Brazilian coasts, and for which information on genetic diversity and origins is scar...

O trabalho intitulado ”Cultivo de Ostras na comunidade de Nova Olinda (Augusto Corrêa, Estado do Pará): discutindo e planejando diretrizes para um futuro ordenamento dos bancos naturais” que foi apresentado oralmente no XXV Encontro Brasileiro de Malacologia & III Simpósio Latino Americano de Jovens Taxonomistas na cidade de Mossoró - RN de 19 a 23...

Apresentação do trabalho no XII Congresso de Ecologia do Brasil.

Man-made forest edges affect tree community composition and structure, but there is little information on the effects of natural edges. To detect tree community changes related to natural edges, we investigated a terrestrial forest island, bordered by grassland and mangrove landscapes, on the Brazilian Amazon coast. Forest structure and tree specie...

Abstract. Please support the Pan American Journal of Aquatic Sciences by downloading from their site: http://www.panamjas.org/pdf_artigos/PANAMJAS_9(2)_112-125.pdf The precision of density and spatial dispersion (Morisita's index) of an economically important intertidal bivalve (Anomalocardia flexuosa) and mangrove macroinfauna was evaluated after...

Marismas são formações vegetais comuns nas regiões temperadas. Nos trópicos, atuam como pioneiras em áreas estuarinas e costeiras de baixa energia. Marismas tropicais exercem importantes funções ecológicas favorecendo a colonização dos manguezais e eventualmente sendo substituídas por estes nas regiões costeiras Marismas exercem diversas influencia...

Brazilian mangroves have ecological and economic importance, with molluscs, crustaceans and polychaetes being diverse and common faunal groups. The present study characterizes the macrofauna associated with logs from two mangrove forests in Pará State, northern Brazil, sampled in September, January and April, between 2008 and 2010, at three differe...

In an effort to develop molecular tools for oyster identification, this study reveals the usefulness of a multiplex polymerase chain reaction (PCR) for the reliable, rapid and low-cost identification of the four oyster species found along the Brazilian coast: Crassostrea gasar, Crassostrea rhizophorae, Crassostrea gigas and Crassostrea sp. Canela o...

Please support the Pan American Journal of Aquatic Sciences by downloading from their site: http://www.panamjas.org/pdf_artigos/PANAMJAS_8(4)_282-298.pdf Spatio and temporal variation in benthic macroinfaunal structure in saltmarshes from the Pará coast was described at four sites, sampled in April and November of 2008, representing peak condition...

Download directly from the ICS 2013 site: http://ics2013.org/papers/Paper3734_rev.pdf Mangrove coasts in northern Brazil are subject to seasonal discharges of freshwater input from rivers and terrestrial runoff. However, little is known about the effects of freshwater discharge on the subtidal benthos in the region. Thus, three sites, each represe...

Please support the _Revista Brasileira de Biociências_ by downloading from their site: http://www.ufrgs.br/seerbio/ojs/index.php/rbb/article/view/2055 Detection of mitochondrial DNA heteroplasmy suggests a doubly uniparental inheritance pattern in the mus- sel Mytella charruana). The unusual type of mitochondrial DNA (mtDNA) transmission in which...

Management and culture of mangrove oysters may reduce harvesting pressure on natural populations in northern Brazil. Densities of oyster seed, scars and other epibenthos on plastic sheets and bottles were observed over two years at a mangrove island (Ilha Canela), Bragança, Pará, northern Brazil. The only oyster species found settling on the substr...

The glochidia of Diplodon (Diplodon) suavidicus (Lea, 1856), D. (D.) obsolescens F. Baker, 1914, Diplodon (Rhipidodonta) hylaeus (d`Orbigny, 1835), Prisodon obliquus Schumacher, 1817, Paxyodon syrmatophorus (Meuschen, 1781), Triplodon corrugatus (Lamarck, 1819, and Costalia ambigua Lamarck, 1819 were redescribed based on comparisons of external mor...

The composition and abundance of the poorly known benthic macroinfauna associated with northern Brazilian saltmarshes, were described from eight sites (between 0°42′2.5″S, 47°52′44.1″W and 0°50′17.3″S, 46°36′13.3″W) along the Pará coast, Brazil. Sampling was carried out in November of 2007. Univariate and multivariate analyses were used to test for...

This chapter deals with studies of the fauna of the mangrove forest and that of the tidal creeks of the Ajuruteua Peninsula, in Bragança, northern Brazil. The first part is focused on diversity and its spatial distribution and discusses the factors affecting diversity and abundance of the species assemblage. In addition, the impact of the construct...

Freshwater mussels in the Tocantins River are exploited for their shells to make buttons. Data were collected on mussel density, size frequency distribution, habitat and exploitation level at five sites. The most abundant species is Paxyodon syrmatophorus (Meuschen, 1781) and is preferred by fishermen. Mean harvested shell size is larger than that...

Please support Genetics and Molecular Biology by downloading this article using the DOI link above. Oysters (Ostreidae) manifest a high degree of phenotypic plasticity, whereby morphology is of limited value for species identification and taxonomy. By using molecular data, the aim was to genetically characterize the species of Crassostrea occurrin...