Acta Limnologica Brasiliensia

Abstract: Aim The study investigated functional groups representing reservoirs of different trophic states, identifying eutrophication indicators. Methods Water samples were collected to evaluate physical and chemical characteristics and the phytoplankton composition in five reservoirs during dry and rainy periods. Results Low concentration of dissolved nutrients (nitrite, orthophosphate, and total dissolved phosphorus) and total phosphorus described the oligotrophic and mesotrophic reservoirs, and the opposite for the eutrophic and hypertrophic reservoirs. Twenty-four functional groups were identified, eight of which were considered descriptors due to high biomass. Functional groups were influenced by the trophic state, and secondarily by seasonality. Typical functional groups represented the hypertrophic, eutrophic, and mesotrophic reservoirs. However, an oligotrophic reservoir was represented by a functional group commonly associated with environmental eutrophic. Conclusions The functional groups were representative of the trophic state of systems and detected signs of early eutrophication.

Simone Alves de Oliveira

Carla Ferragut

Carlos Eduardo de Mattos Bicudo

Phytoplankton functional groups associated with the trophic state of tropical reservoirs

热带水库营养状态相关的浮游植物功能群

Pitágoras da Conceição Bispo

Adriano Sanches Melo

Adolfo Ricardo Calor

Rodolfo Mariano

Luiz Carlos Pinho

Obituary: Claudio Gilberto Froehlich (1927-2023), a mentor for multiple generations of researchers on biodiversity

悼词：克劳迪奥·吉尔伯托·弗勒利希（1927-2023），多代生物多样性研究者的导师

Abstract Aim The main objective was to investigate changes in the prevalence and infestation intensity of the epibiotic relationship (ciliates/calanoids) in relation to the impact of bauxite tailings (natural and impacted areas) during two distinct periods of the hydrological pulse (rising and high-water). Methods The hydrological pulse of this system can be characterized with four distinct phases: rising, high-water, falling, and low-water. After degradation by bauxite tailings for ten years (1979-1989), and despite an ongoing long-term ecological restoration process, it is still possible to recognize two distinct regions in the lake: the area impacted by the tailings and the natural area. We sampled zooplankton (calanoids and epibiont ciliates) and limnological variables during the high-water period (March 2015) and rising-water period (June 2019) at twelve sampling points in Lake Batata, six in the impacted area and six in the non-impacted area. Results This is the first record of peritrichous epibiont ciliates Epistylis sp. colonizing calanoid copepods in Amazonian ecosystems (Lake Batata, Pará, Brazil). We recorded epibiont ciliates in the calanoid copepodite and adult stages, as well as the main location sites on the thorax and abdomen. Our study recorded a significant difference in the prevalence and mean infestation intensity between the natural and bauxite tailings-impacted areas, and in the prevalence of infestation between the rising -water (2015) and high-water (2019) collections. The prevalence of infestation was higher in the impacted area and during the rising-water period. Conclusions Although the host/epibiont/environment interaction is complex and requires analysis with a larger number of temporal samples, this study records a clear effect of flooding in this Amazonian system on the spatial and temporal dynamics of epibiont ciliates associated with calanoid copepods.

Wésley Altino Flores

Pedro Mendes de Souza

Iollanda Ivanov Pereira Josué

Roberto Júnio Pedroso Dias

Reinaldo Luiz Bozelli

Epistylid ciliates as epibionts on calanoid copepods in an Amazonian floodplain lake (Batata Lake)

亚马逊洪泛湖泊（巴塔塔湖）中桡足类哲水蚤上的附生缘毛类纤毛虫

Abstract: Aim i) to characterize the composition of the Cladocera species hatched from the resting eggs of permanently hydrated and temporarily dehydrated sediments; ii) to test whether periodic dehydration reduces the hatching of the resting eggs. Methods Cladocera resting eggs were collected from the sediment of Tupé lake, Amazonas, Brazil. Sampling was performed in the dry season, when the sediment was found in two conditions: Permanently Hydrated Sediment (PHS) in the lake main channel and Temporarily Dehydrated Sediment (TDS) on the margin. Hatching was experimented through a temperature of 24 °C (± 2 °C) and a photoperiod of 12h light: 12h dark, for 20 days. Results Eight Cladocera taxa were counted among the two sediments. In PHS five taxa (one exclusive) were identified and seven taxa (three exclusive) occurred in TDS. The comparison of the hatching rate of Cladocera eggs between TDS (0.36 ± 0.48%) and PHS (0.32 ± 0.49%) was not significant (GLM: χ21= 0.012; P &gt; 0.05; Pseudo-R2M= 0.0006). Conclusions The hypothesis that periodic dehydration of Cladocera resting eggs reduces egg hatching has been refuted. This leads us to conclude that natural periodic dehydration does not affect the hatching of resistance eggs, therefore, resistance eggs, as already reported in the literature are an important mechanism for the maintenance and success of organisms in environments, even undergoing profound changes caused due to the large variation in water levels that occur in Amazon rivers and associated environments.

Camila de Araújo Couto

Raize Castro-Mendes

Renan Gomes do Nascimento

Alexander Armando Flores Arzabe

Luis Geraldes Primeiro

Maiby Glorize da Silva Bandeira

Edinaldo Nelson dos Santos-Silva

Hatching of Cladocera (Crustacea: Branchiopoda) resting eggs from permanently hydrated and temporarily dehydrated sediments of an Amazon lake

亚马逊湖泊永久湿润和暂时脱水沉积物中枝角类（甲壳纲：鳃足亚纲）休眠卵的孵化

Abstract Water security involves ensuring that water is available in sufficient quality and quantity to meet the needs of human health, livelihoods, ecosystems, and productive activities. This opinion paper highlights the crucial role of Long-Term Ecological Research (LTER) in shaping strategies to achieve water security. We begin by defining both water security and LTER, and by illustrating how LTER contributes to securing water resources. We then briefly discuss the significance of early long-term studies that have laid the foundation for water security efforts. Following this, we examine LTER programs focused on freshwater ecosystems in Brazil, with particular emphasis on two case studies in the Upper Paraná River: the LTER program in the Upper Paraná River floodplain and the monitoring of macrophytes in the Itaipu Reservoir. We show that long-term studies in Brazil have supported the implementation of strategies that benefit various dimensions of water security, positively impacting supporting, provisioning, regulating, and cultural ecosystem services. Finally, we discuss the incorporation of water security into Brazilian legislation. While Brazilian scientists and managers possess experience in both LTER and water security issues, ensuring the implementation and enhancement of the benefits through legislative measures and other instruments that prioritize most of the society, rather than catering solely to the most influential economic sectors is challenging.

Sidinei Magela Thomaz

Simone Frederigi Benassi

Roseli Frederigi Benassi

The importance of long-term research for water security: a perspective for Brazilian waterbodies

长期研究对水安全的重要性：巴西水体的视角

ISSN	0102-6712, 2179-975X
h-index	23

Publication Information	Publisher: Brazilian Limnology Association，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2011，Proportion of original research papers: 0.00%，Self Citation Rate:N.A.， Gold OA Rate: 0.00%
Average review cycle	网友分享经验：50 Weeks

Acta Limnologica Brasiliensia

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Phytoplankton functional groups associated with the trophic state of tropical reservoirs

Obituary: Claudio Gilberto Froehlich (1927-2023), a mentor for multiple generations of researchers on biodiversity

Epistylid ciliates as epibionts on calanoid copepods in an Amazonian floodplain lake (Batata Lake)

Hatching of Cladocera (Crustacea: Branchiopoda) resting eggs from permanently hydrated and temporarily dehydrated sediments of an Amazon lake

The importance of long-term research for water security: a perspective for Brazilian waterbodies

Phytoplankton functional groups associated with the trophic state of tropical reservoirs

Obituary: Claudio Gilberto Froehlich (1927-2023), a mentor for multiple generations of researchers on biodiversity

Epistylid ciliates as epibionts on calanoid copepods in an Amazonian floodplain lake (Batata Lake)

Hatching of Cladocera (Crustacea: Branchiopoda) resting eggs from permanently hydrated and temporarily dehydrated sediments of an Amazon lake

The importance of long-term research for water security: a perspective for Brazilian waterbodies