Programa de Pós-Graduação em Ecologia - PPGECO/ICB

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/8937

O Programa de Pós-Graduação em Ecologia (PPGECO) foi criado em 2015, por meio de um convênio firmado entre a Universidade Federal do Pará (UFPA) e Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) e visa avançar no conhecimento teórico e empírico da Ecologia, incluindo suas abordagens básicas que são a autoecologia, a biologia de populações e os estudos de comunidades e ecossistemas.

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    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.
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    ItemAcesso aberto (Open Access)
    Efeitos de perturbações antrópicas sobre os fatores ambientais e espaciais na estruturação de metacomunidades de insetos aquáticos na Amazônia Oriental
    (Universidade Federal do Pará, 2022-07) OLIVEIRA, Stéfany Vitória Santos; FARIA, Ana Paula Justino de; http://lattes.cnpq.br/6041546003155327; https://orcid.org/0000-0003-2729-5358; SANTOS, Raphael Ligeiro Barroso; http://lattes.cnpq.br/7227882802366966; https://orcid.org/0000-0001-9717-5461
    Anthropogenic pressures resulting from changes in land use have great potential to impact the dynamics of aquatic insect metacommunities, once they alter the environmental quality of streams, and may impose barriers to dispersal. The objective of this study is to evaluate the structuring of aquatic insect assemblages (Ephemeroptera, Plecoptera and Trichoptera orders - EPT) in Amazonian streams under natural conditions (control streams) and under disturbance by human activities (altered streams) is influenced by characteristics of fluvial habitats and by the spatial structure. Our hypotheses is that in control streams, habitat characteristics are the main structuring factor of EPT assemblages, and that in altered streams, habitat characteristics related to human disturbances and spatial structure are the main assemblage structuring factors. A total of 74 streams were sampled in the Capim River basin, Pará, Brazil, wich 38 are control streams and 36 are altered streams. In each of them, environmental variables associated with water chemistry, channel hydromorphology, sediment types, riparian vegetation and insect shelter were measured, in addition to the proportion of land uses and EPT assemblages. Our results showed that several environmental characteristics of the streams were affected by human activities. Environmental factors had a greater influence on the structuring of EPT assemblages than the other factors evaluated, both in the control and altered streams. The influence of the spatial factor was weak. The assemblages of altered streams were structured both by environmental variables affected by disturbances and by variables subject to natural variation, demonstrating that the assemblages in these environments are not governed only by environmental changes. Our study demonstrates the importance of the species sorting process in metacommunities of Amazonian streams, and the role of disturbance in this process.
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    ItemAcesso aberto (Open Access)
    A heterogeneidade de bancos de macrófitas aquáticas e a diversidade de peixes em uma ria fluvial amazônica
    (Universidade Federal do Pará, 2019-03) NONATO, Flávia Alessandra da Silva; MONTAG, Luciano Fogaça de Assis; http://lattes.cnpq.br/4936237097107099; https://orcid.org/0000-0001-9370-6747; MICHELAN, Thaísa Sala; http://lattes.cnpq.br/4609629132683283; https://orcid.org/0000-0001-9416-0758
    In freshwater ecosystems, macrophyte species can provide habitat heterogeneity with different structural forms, ranging from free submerged species to rooted species, which serve as a substrate for spawning, food and refuge against predation to fish and other organism. In the 49 present work we tested the effect of the heterogeneity of aquatic macrophyte banks on the richness and abundance and functional traits of the fish in flooded rivers of the Amazon. To investigate the relationship between the heterogeneity of the macrophyte banks and the richness, abundance, and functional characteristics of the fish, we used them CWM analysis and simple linear regressions. We identified 16 species of aquatic macrophytes and 21 species of fish in the 34 sampling points. The macrophyte banks were dominated by the species Eichhornia azurea and. E. crassipes. The most abundant fish species were Hemigrammus ocellifer and Laimosemion strigatus. The linear regression result was only significant between the heterogeneity of the macrophyte banks on two functional attributes, both linked to the locomotion of the fish. Our results show that the association between the heterogeneity provided by the macrophyte banks is an environmental filter for fish species that have high maneuverability, since these species can swim between macrophyte structures. Thus, we can observe that the heterogeneity provided by aquatic macrophytes, although not affecting the richness and abundance of fish, is important for different species of fish, but for those that use and depend on these banks as a refuge.
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