Navegando por Orientadores "PETRACCO, Marcelo"

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Acesso aberto (Open Access)
Ecologia populacional de Clibanarius symmetricus (Anomura: Diogenidae) em uma praia exposta da Costa Amazônica Brasileira
(Universidade Federal do Pará, 2017-06) DANIN, Ana Paula Ferreira; SANTOS, Cleverson Ranieri; PETRACCO, Marcelo; http://lattes.cnpq.br/6834814201680920; https://orcid.org/0000-0001-6501-0099
The hermit crab Clibanarius symmetricus has a wide geographical distribution along the Western Atlantic where is a conspicuous species in intertidal and shallow waters of several ecosystems as sandy beaches, tidal flats, mangroves and rocky shores. However, information on the life history traits of this species is in general limited to the subtropical regions. Here, we access the population structure and dynamics, and the shell occupation pattern of a C. symmetricus population inhabiting a rocky outcroup of an exposed sandy beach on the Amazon coast. For this purpose, monthly samplings were carried out from October 2015 to September 2016. Higher density of C. symmetricus occurred in the drier season and the frequent presence of ovigerous females suggests continuous reproduction. The overall sex-ratio was skewed toward females (0.6:1, M:F) and sexual dimorphism was recorded. Males and females had similar curvature, but smaller growth performance index than others subtropical populations. The turnover rate (P/B) was also similar between sexes as a consequence of similar growth constant. Thaisella coronata was the most occupied (97.1%) gastropod shell and the overlap in shell utilization by hermit crabs of same size may reflect competitive interactions. Also, some difference in occupation between sexes was documented, suggesting that males can occupy larger and more suitable shells.
Acesso aberto (Open Access)
Ecologia populacional de Ocypode quadrata (Brachyura: Ocypodidae) em uma praia arenosa exposta de macromaré da costa amazônica do Brasil
(Universidade Federal do Pará, 2017-03) SOUZA, Diego Garcia Cordeiro; POMBO, Maíra; http://lattes.cnpq.br/0599201977466564; PETRACCO, Marcelo; http://lattes.cnpq.br/6834814201680920; https://orcid.org/0000-0001-6501-0099
The present study analyzes the population ecology of Ocypode quadrata (Brachyura: Ocypodidae) on an exposed, macrotidal, dissipative sandy beach located on the Amazon coast, during one year. Indirect (burrow counting and measurement) and direct (burrow excavation and assessment of individuals) methods were used on population assessments. Burrow abundance variation was analyzed over time and as a function of environmental variables (sediment properties, precipitation, air and seawater temperature, salinity). Zonation was described through burrow distribution by distance from the high tide mark. Burrow diameter was used to estimate individual growth parameters of the population. Burrow occupation rate, sex ratio and relation between burrow diameter and crab measures (carapace length, width and depth) were also estimated. Abundance was higher on the rainy season (0.78 ± 0.24 burrow.m-1, against 0.37 ± 0.13 burrow.m- 1 on the dry season) and related positively to precipitation and negatively to sediment grain size. The population was practically restricted to the supralittoral zone. The estimated individual growth parameters (L∞=53.36 mm, K=0.76 yr-1, t0=0.014 yr, Φ=3.34) describe a well-adjusted curve to cohort progression over time. Burrow occupation rate varied between 12.5% and 28.7%. There was sex equilibrium during the rainy season, however, changing to male predominance on the dry season. Burrow diameter was related mainly to carapace width. These are the first data of ghost crab population behavior on Amazon macrotidal environments. These, compared to available data on other regions, also gives insight on latitudinal tendencies of population parameters.
Acesso aberto (Open Access)
Resíduos sólidos urbanos, mapeamento e educação ambiental: proposta de instrumento para participação comunitária na questão ambiental no bairro da Marambaia, Belém-Pa
(Universidade Federal do Pará, 2018-12-17) PEREIRA, Moacir José Moraes; LUCZYNSKI, Estanislau; http://lattes.cnpq.br/9749970886455933; PETRACCO, Marcelo; http://lattes.cnpq.br/6834814201680920
In urban cultures, we can observe a close relationship with the consumption of products of industrial origin, which generate waste that, when not disposed of and treated properly, has a significant impact on the urban environment. The population of the district of Marambaia, located in Belém do Pará, Brazil, with more than 65,000 inhabitants, has suffered from environmental problems related to the management of Urban Solid Waste -RSU, and has sometimes contributed to the increase of this environmental problem when irregularly discard these waste. In this sense, this study presents a platform for mapping points of irregular waste disposal in the Marambaia neighborhood, using geoprocessing techniques, computational tools and stimulation of neighborhood participation through participative and collaborative mapping, as well as field and application research of questionnaires in schools. Some results show that environmental perception is a relevant form of analysis and should be considered for environmental management and education processes. For the mapping, the places with the highest presence points of irregular waste disposal are public spaces. It was possible to identify that there is an important percentage of people who choose to hire people locally called 'carrinheiros' to dispose of part of the solid waste produced in their homes, contributing to the environmental problem. In the waste disposal points identified, more than 60% of them present economically viable materials, which would allow the implementation of selective collection and recycling of materials through the creation of Green Points. Environmental education activities contributed to the development of information multipliers on the problem of solid waste in the neighborhood.