The aim of the current study is to feature the composition, frequency and richness of cyanobacteria species and their spatial-temporal distribution patterns in Curiaú River. Quarterly collections were carried out at three sampling sites, from June 2016 to October 2017. Phytoplankton and periphyton samples were collected and fixed with Transeau’s solution to be identified under optical microscope. Data were statistically treated through descriptive, variance and cluster analyses; significance level was set at p<0.05. In total, 17 taxa were identified and grouped into four (4) taxonomic orders, namely: Chroococcales, Nostocales, Synechococcales and, most prevalently, Oscillatoriales. Genera Kamptonema (67%) and Phormidium (44%) were the most frequent taxa. Cyanobacteria richness has shown significant variations (p<0.05) among sampling sites. This pattern was not observed for seasonal fluctuations (p> 0.05). These data also represent pioneering information about cyanobacteria biodiversity in Amapá State.

A APA do Rio Curiaú foi criada pelo Governo do Estado do Amapá (Lei nº 0431/1998) com o objetivo de mitigar os impactos ambientais causados pela expansão urbana da capital do estado, Macapá, bem como conservar os recursos naturais presentes na área da, então conhecida, vila do Curiaú. Este estudo buscou reconhecer a percepção ambiental dos moradores da APA do Rio Curiaú como instrumento de sensibilização para a conservação e gestão da biodiversidade, verificando os conflitos e limitações in loco. Dados foram coletados com 49 famílias das comunidades de “Curiaú de dentro” e “Curiaú de fora”, utilizando formulários estruturados, observação participante, contatos individuais e registros fotográficos. Os resultados demonstram que atividades ilegais ocorrem na área, associados a pesca e caça predatória ou atividades ligadas ao desmatamento feitas, majoritariamente, por atores sociais do entorno ou externos a APA. A ausência de instrumentos educativos aliados a inércia do poder público tem resultado em interferências humanas nos limites daquela região, causando uma série de impactos em curto, médio e longo prazo. Persiste, assim, a necessidade de uma gestão mais comprometida com a fiscalização ambiental e com o engajamento comunitário, visando informar, sensibilizar, estimular e promover ações e instrumentos participativos para a conservação da biodiversidade local.

This study aimed to verify the occurrence and socio-environmental impacts of the presence of African Snail in the Açai neighborhood, city of Macapá, State of Amapá, showing problems such as the occurrence of the species and the lack of knowledge of the community about its infestation and control. The interviews were conducted using semi-structured forms to collect information on site and photographic record, for a period of four months (08/2013 to 12/2013). Variables of social and environmental axes were evaluated as impact indicators. The results showed that a greater performance of the public would contribute directly to the quality of life of the population and the environment, promoting the decrease in the occurrence of this snail. An environmental education program aimed at disseminating information on the impacts of African snail should be encouraged. It is necessary to work in the development of legal instruments, as well as in the development of campaigns to clarify the population.

Periphyton communities are composed of microorganisms loosely attached to the substrate, including fungi, bacteria, microinvertebrates, and mostly microalgae. Due to their photosynthesizing component, they are important primary producers that subsidize the aquatic trophic chain. This study aimed to verify the composition, frequency, and seasonal distribution of periphytic microalgae in stretches of the Curiaú River, located in the Environmental Protection Area (APA) of the Curiaú River, in the State of Amapá. For this, quarterly collections were carried out comprising the months of June 2016 to October 2017, during the dry and rainy seasons. The periphyton algal communities were obtained by squeezing parts of two macrophytes species, Eichhornia crassipes Mart. (Solms) and Pistia stratiotes L. The data were statistically treated using absolute values and the Kruskal-Wallis test, the latter considering the distribution of richness between sites and sampling periods (significance level of α=0.05). A total of 64 taxa were inventoried, aggregated into three taxonomic divisions: Chlorophyta (n=48; 75%), Cyanophyta (n=12; 18.75%) and Heterokontophyta (n=4; 6.25%). In class terms, Zygnematophyceae had the highest number of taxa (n=42; 65.63%), followed by Cyanophyceae (n=12; 18.75%), Chlorophyceae (n=5; 7.81%), Bacillariophyceae (n=4; 6.25%) and, finally, Ulvophyceae (n=1; 1.56%). Of the total number of inventoried taxa, 64.06% (n=41) presented sporadic frequency. Species richness was influenced by seasonality, as higher values were associated with the rainy season (p<0.05). This research is a contribution to the phycology of the Amazon region, especially in its pioneering for the state of Amapá.

Odonata order, popularly known as dragonflies, comprises insects belonging to group Palaeoptera and presents hemimetabolous development encompassing three life cycle stages: eggs, larvae and adults. Odonata order has three suborders, namely: Anisoptera, Zygoptera and Anisozygoptera - the last one is exclusively distributed in Asia. The aim of the current study is to investigate the composition, abundance and diversity of Odonata larvae in middle Araguari River (Amapá, Brazil) by evaluating space-seasonal fluctuations and their association with different substrates. Eight collection sites were set along the river.  Quarterly samplings were performed within an annual cycle (April/2018 to April/2019) by positioning a trawl "D" net (Rapiché) on the riverbed and scraping the substrate to collect 2L of sample. Odonata richness, abundance and diversity indices were evaluated. Data were statistically treated based on simple descriptive analysis, means, medians and standard deviations, Kruskal-Wallis test (nonparametric data) and ANOVA (parametric data) in the R-statistics Software. Two hundred and ninety-seven (297) individuals were identified; Libellulidae was the most abundant family (80.13%). Diversity and equitability have shown variations between sampling sites (p<0.05) and collection campaigns (p<0.05). Only abundance was influenced by categorical variables such as downstream/upstream river and substrate type. Higher taxonomic resolution, in combination to environmental variables, could help establishing ecosystem relationships that were not identified in the current study.