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  1. Article ; Online: Seasonal changes in primary production and respiration in a subtropical lake undergoing eutrophication.

    Tonetta, Denise / Petrucio, Mauricio Mello

    Environmental monitoring and assessment

    2020  Volume 192, Issue 9, Page(s) 565

    Abstract: The balance between gross primary production (GPP) and respiration (R) is frequently used to estimate the role of lakes in the carbon cycle. Seasonal changes in the carbon cycle of subtropical lakes are often underestimated, but changes in meteorological ...

    Abstract The balance between gross primary production (GPP) and respiration (R) is frequently used to estimate the role of lakes in the carbon cycle. Seasonal changes in the carbon cycle of subtropical lakes are often underestimated, but changes in meteorological and limnological characteristics often follow the well-defined climatic seasons. Based on 1 year's free-water dissolved oxygen and temperature measurements, we investigated the seasonal changes in primary production and respiration in subtropical Peri Lake in Southern Brazil, which is currently undergoing eutrophication. We expected that periods of high light availability and temperature would lead to a net autotrophic condition. Furthermore, we explored the seasonal coupling between GPP and R, expecting that different sources of organic matter would have different effects on the metabolic rates. We found that Peri Lake was predominately net heterotrophic (GPP  < R). GPP was high during summer and autumn and low in winter, as was R, coinciding with the seasonal changes occurring in light and temperature. Light conditions were of essential importance for the variations in GPP, while respiration was fueled by both autochthonous and allochthonous organic matter. Constant external input of organic matter resulted in a generally low coupling between GPP and R. A tighter coupling between GPP and R was observed in spring as a result of higher productivity, while a decoupling in autumn was due to intensified allochthonous organic matter runoff caused by rainfall and wind. We found that higher productivity rates in summer did not shift the system to an autotrophic condition and that Peri Lake functioned as a carbon source, light and organic matter being the prime drivers for the metabolic rates.
    MeSH term(s) Brazil ; Environmental Monitoring ; Eutrophication ; Lakes ; Seasons
    Language English
    Publishing date 2020-08-06
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 782621-7
    ISSN 1573-2959 ; 0167-6369
    ISSN (online) 1573-2959
    ISSN 0167-6369
    DOI 10.1007/s10661-020-08525-6
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  2. Article: Seasonal changes in primary production and respiration in a subtropical lake undergoing eutrophication

    Tonetta, Denise / Petrucio, Mauricio Mello

    Environmental monitoring and assessment. 2020 Sept., v. 192, no. 9

    2020  

    Abstract: The balance between gross primary production (GPP) and respiration (R) is frequently used to estimate the role of lakes in the carbon cycle. Seasonal changes in the carbon cycle of subtropical lakes are often underestimated, but changes in meteorological ...

    Abstract The balance between gross primary production (GPP) and respiration (R) is frequently used to estimate the role of lakes in the carbon cycle. Seasonal changes in the carbon cycle of subtropical lakes are often underestimated, but changes in meteorological and limnological characteristics often follow the well-defined climatic seasons. Based on 1 year’s free-water dissolved oxygen and temperature measurements, we investigated the seasonal changes in primary production and respiration in subtropical Peri Lake in Southern Brazil, which is currently undergoing eutrophication. We expected that periods of high light availability and temperature would lead to a net autotrophic condition. Furthermore, we explored the seasonal coupling between GPP and R, expecting that different sources of organic matter would have different effects on the metabolic rates. We found that Peri Lake was predominately net heterotrophic (GPP < R). GPP was high during summer and autumn and low in winter, as was R, coinciding with the seasonal changes occurring in light and temperature. Light conditions were of essential importance for the variations in GPP, while respiration was fueled by both autochthonous and allochthonous organic matter. Constant external input of organic matter resulted in a generally low coupling between GPP and R. A tighter coupling between GPP and R was observed in spring as a result of higher productivity, while a decoupling in autumn was due to intensified allochthonous organic matter runoff caused by rainfall and wind. We found that higher productivity rates in summer did not shift the system to an autotrophic condition and that Peri Lake functioned as a carbon source, light and organic matter being the prime drivers for the metabolic rates.
    Keywords autumn ; carbon ; carbon cycle ; dissolved oxygen ; eutrophication ; gross primary productivity ; lakes ; organic matter ; rain ; runoff ; spring ; summer ; temperature ; wind ; winter ; Brazil
    Language English
    Dates of publication 2020-09
    Size p. 565.
    Publishing place Springer International Publishing
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 782621-7
    ISSN 1573-2959 ; 0167-6369
    ISSN (online) 1573-2959
    ISSN 0167-6369
    DOI 10.1007/s10661-020-08525-6
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  3. Article: When and how much a non-native tree species changes the temporal patterns and biomass of litterfall input in subtropical streams

    Fontana, Lucas Eugenio / Biasi, Cristiane / Restello, Rozane Maria / Hepp, Luiz Ubiratan / Petrucio, Mauricio Mello

    Marine & freshwater research. 2022, v. 73, no. 7

    2022  

    Abstract: Context In headwater streams, allochthonous litterfall input is an essential process to maintain the ecosystem functioning. The presence of non-native species in the riparian vegetation, with phenological characteristics distinct from those of most ... ...

    Abstract Context In headwater streams, allochthonous litterfall input is an essential process to maintain the ecosystem functioning. The presence of non-native species in the riparian vegetation, with phenological characteristics distinct from those of most native tree species, can alter this process. Aims We evaluated the effect of the phenology of a non-native species (Hovenia dulcis) on the temporal patterns and biomass of litterfall input into streams by comparing one stream with (Hovenia stream) and another without (Native stream) H. dulcis in their riparian vegetation. Methods We quantified the litterfall input from native tree species and H. dulcis for 1year by using buckets suspended above the streambeds. Key results The temporal pattern of litterfall input changed between streams, with quantitative differences between them during autumn and winter. In the Native stream, litterfall input was slightly higher in spring (∼79gm−2 month−1), followed by winter (∼68gm−2 month−1) and autumn (∼54gm−2 month−1), whereas in the Hovenia stream, it was concentrated in autumn (∼126gm−2 month−1). Conclusions and implications Our results indicated that the presence of H. dulcis in the riparian vegetation, when in high density, changes the temporal pattern and biomass of litterfall input into subtropical streams.
    Keywords Hovenia dulcis ; autumn ; biomass ; ecosystems ; freshwater ; introduced species ; phenology ; plant litter ; research ; riparian vegetation ; spring ; stream channels ; trees ; winter
    Language English
    Size p. 931-939.
    Publishing place CSIRO Publishing
    Document type Article
    ZDB-ID 1283028-8
    ISSN 1323-1650
    ISSN 1323-1650
    DOI 10.1071/MF21173
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  4. Article: Environmental conditions are more effective than nutrient availability and spatial processes on explaining microphytoplankton functional structure in a subtropical hypereutrophic reservoir

    Alves, Jonatas / Pinheiro‐Silva, Lorena / Schuster, Karling Fernanda / Matthiensen, Alexandre / Petrucio, Mauricio Mello

    Austral ecology. 2022 Apr., v. 47, no. 2

    2022  

    Abstract: The structure of freshwater phytoplankton communities can be strongly influenced by environmental and spatial processes at different scales. To identify the main forces that drive phytoplankton structure becomes a relevant tool to understand several ... ...

    Abstract The structure of freshwater phytoplankton communities can be strongly influenced by environmental and spatial processes at different scales. To identify the main forces that drive phytoplankton structure becomes a relevant tool to understand several knowledge gaps in the phytoplankton ecology domain, such as community succession, biological invasions and responses to disturbances. We used the morphological‐based functional groups (MBFG) approach to investigate the influence of environmental conditions (physical and chemical factors), nutrient availability and spatial processes (habitat connection and species dispersal) in structuring microphytoplankton community in a subtropical hypereutrophic reservoir located in southern Brazil. Samples were taken quarterly, between February 2017 and December 2018. We used distance‐based multivariate analysis of variance (PERMANOVA) to evaluate potential spatial and seasonal dissimilarities in the MBFG’s biovolume, and variation partitioning approach (pRDA) to evaluate the role of environmental, nutrient availability and spatial components in explain the microphytoplankton community structure. We identified 16 microphytoplankton taxa, which were sorted into five MBFGs. Significant seasonal dissimilarities were observed in the MBFG’s biovolume. Higher relative biovolume of potential harmful cyanobacteria (MBFG III) and alien dinoflagellates (MBFG V) was observed in summer and autumn/winter, respectively. Pure environmental component (composed by physical and chemical predictors insolation, precipitation, total dissolved solids, turbidity, water temperature, water transparency and wind intensity) explained 45% of the variance in the MBFG’s biovolume, whereas pure nutrient availability component explained 7% and spatial component explained only 3% of the biotic variance. The results showed that the environmental factors – especially the seasonal‐influenced ones – are more effective than nutrient availability and spatial processes in explaining the microphytoplankton community structure in this ecosystem. Our findings alert to the need to consider the variability of the environmental conditions (mainly those directly influenced by seasonality) in phytoplankton community structure in disturbed freshwater ecosystems prone to eutrophication events.
    Keywords Cyanobacteria ; Miozoa ; autumn ; community structure ; eutrophication ; freshwater ; habitat connectivity ; multivariate analysis ; nutrient availability ; phytoplankton ; solar radiation ; species dispersal ; summer ; turbidity ; variance ; water temperature ; wind ; winter ; Brazil
    Language English
    Dates of publication 2022-04
    Size p. 291-305.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2019899-1
    ISSN 1442-9993 ; 1442-9985
    ISSN (online) 1442-9993
    ISSN 1442-9985
    DOI 10.1111/aec.13110
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  5. Article ; Online: Relationships between aquatic invertebrate communities, water-level fluctuations and different habitats in a subtropical lake.

    Lemes da Silva, Aurea Luiza / Petrucio, Mauricio Mello

    Environmental monitoring and assessment

    2018  Volume 190, Issue 9, Page(s) 548

    Abstract: In lakes, the littoral habitat and its invertebrate communities are often exposed to water-level fluctuations. We examined the effects of seasonal changes on water level, substrata availability and benthic fauna in the littoral zone of Peri Lake, a ... ...

    Abstract In lakes, the littoral habitat and its invertebrate communities are often exposed to water-level fluctuations. We examined the effects of seasonal changes on water level, substrata availability and benthic fauna in the littoral zone of Peri Lake, a shallow lake that has experienced a strong reduction in water level due to changes in rainfall. In this study, we also examined whether the abundance and composition of aquatic invertebrates differed among the four substrata. Our main objective was to assess the effect of seasonal changes on water level and benthic invertebrates inhabiting the different types of substrata. Benthic invertebrates were sampled four different substrata (Schoenoplectus californicus, sand and stones, allochthonous leaf litter, and macrophyte stands), and we also measured meteorological, physical and chemical variables. We found that complex habitats, such as allochthonous leaf litter and aquatic macrophyte, stand to be colonised by a larger number of macroinvertebrates because they provide more habitats or potential niches for colonisation by different species. In addition, we observed that during periods of low water level, the presence of substrata in the littoral zone decreased, as did the associated biota. Therefore, our results suggest that water level changes have a major functional impact on the littoral zone of the lake, and can affect substratum availability, which also impacts invertebrate communities.
    MeSH term(s) Animals ; Aquatic Organisms/classification ; Aquatic Organisms/growth & development ; Biodiversity ; Ecosystem ; Environmental Monitoring ; Invertebrates/classification ; Invertebrates/growth & development ; Lakes/chemistry ; Water ; Water Supply/statistics & numerical data
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2018-08-24
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 782621-7
    ISSN 1573-2959 ; 0167-6369
    ISSN (online) 1573-2959
    ISSN 0167-6369
    DOI 10.1007/s10661-018-6929-3
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  6. Article ; Online: Abiotic variables affect STX concentration in a meso-oligotrophic subtropical coastal lake dominated by Cylindrospermopsis raciborskii (Cyanophyceae).

    Brentano, Débora Monteiro / Giehl, Eduardo L Hettwer / Petrucio, Maurício Mello

    Harmful algae

    2016  Volume 56, Page(s) 22–28

    Abstract: The cyanobacterium Cylindrospermopsis raciborskii is capable of producing toxins including saxitoxin (STX). Few studies have verified the influence of environmental variables on the production of STX and most have only been studied in the laboratory. The ...

    Abstract The cyanobacterium Cylindrospermopsis raciborskii is capable of producing toxins including saxitoxin (STX). Few studies have verified the influence of environmental variables on the production of STX and most have only been studied in the laboratory. The goal of this work was to identify the abiotic variables related to STX concentration in situ. The relationship among STX concentration and the physical variables, nutrients and chlorophyll-a (chl-a) concentration was examined in a meso-oligotrophic subtropical coastal lake dominated by C. raciborskii. A generalized linear model was developed, incorporating all variables measured monthly over a 45-month monitoring period. Conductivity and dissolved inorganic nitrogen (DIN) concentration provided the greatest explanatory power for STX concentration in situ. Previous studies suggested that C. raciborskii cells exposed to stress associated with higher ionic concentrations appear to activate the biosynthesis of STX suggesting that STX can elicit changes cell permeability and may contribute to the homeostasis of this organism. An increase of DIN concentration results in a higher concentration of STX which may be related to a reduced metabolic demand, since the uptake of inorganic nitrogen requires less energy than N
    MeSH term(s) Cylindrospermopsis/metabolism ; Environmental Monitoring ; Lakes/chemistry ; Nitrogen/metabolism ; Saxitoxin/analysis ; Saxitoxin/metabolism
    Chemical Substances Saxitoxin (35523-89-8) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2016-05-17
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2091119-1
    ISSN 1878-1470 ; 1568-9883
    ISSN (online) 1878-1470
    ISSN 1568-9883
    DOI 10.1016/j.hal.2016.03.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Recent land‐use changes affect stream ecosystem processes in a subtropical island in Brazil

    Lemes da Silva, Aurea Luiza / Lemes, William Padilha / Andriotti, Jéssica / Petrucio, Mauricio Mello / Feio, Maria João

    Austral ecology. 2020 Aug., v. 45, no. 5

    2020  

    Abstract: Land‐use changes such as conversion of natural forest to rural and urban areas have been considered as main drivers of ecosystem functions decline, and a large variety of indicators has been used to investigate these effects. Here, we used a replicated ... ...

    Abstract Land‐use changes such as conversion of natural forest to rural and urban areas have been considered as main drivers of ecosystem functions decline, and a large variety of indicators has been used to investigate these effects. Here, we used a replicated litter‐bag experiment to investigate the effects of land‐use changes on the leaf‐litter breakdown process and leaf‐associated invertebrates along the forest–pasture–urban gradient located in a subtropical island (Florianópolis, SC, Brazil). We identified the invertebrates and measured the litter breakdown rates using the litter bags approach. Litter bags containing 3 g of dry leaf of Alchornea triplinervia were deployed on forest rural and urban streams. Principal component analysis, based on physico‐chemical variables which, confirmed a gradient of degradation from forest to urban streams with intermediate values in rural areas. In accordance, shredder richness and abundance were lower in rural and urban than in forest streams. The land‐use changes led also to the dominance of tolerant generalist taxa (Chironomidae and Oligochaeta) reducing the taxonomic and functional diversity in these sites. Leaf‐litter breakdown rates decreased from forest to rural and finally to urban areas and were associated with changes in pH, water velocity, dissolved oxygen and abundance of leaf‐shredding invertebrates, although global decomposition rates did not differ between rural and urban streams. Overall, this study showed that land‐use changes, namely to rural and urban areas, have a strong impact on tropical streams ecosystems, in both processes and communities composition and structure. Despite of being apparently a smaller transformation of landscape, rural land use is comparable to urbanisation in terms of impact in stream functioning. It is thus critical to carefully plan urban development and maintain forest areas in the island of Florianópolis in order to preserve its natural biodiversity and aquatic ecosystems functioning.
    Keywords Alchornea triplinervia ; Chironomidae ; Oligochaeta ; aquatic ecosystems ; bags ; dissolved oxygen ; ecological footprint ; ecological function ; forests ; functional diversity ; invertebrates ; land use change ; landscapes ; leaves ; oxygen ; pH ; plant litter ; principal component analysis ; rural areas ; stream flow ; streams ; urban areas ; urbanization ; Brazil
    Language English
    Dates of publication 2020-08
    Size p. 644-658.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2756933-0
    ISSN 2052-1758 ; 1442-9985
    ISSN (online) 2052-1758
    ISSN 1442-9985
    DOI 10.1111/aec.12879
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  8. Article ; Online: Paleolimnological record as an indication of incipient eutrophication in an oligotrophic subtropical coastal lake in Southern Brazil.

    Hennemann, Mariana Coutinho / Simonassi, José Carlos / Petrucio, Mauricio Mello

    Environmental monitoring and assessment

    2015  Volume 187, Issue 8, Page(s) 513

    Abstract: Paleolimnology of lake sediments can be a powerful tool to assess various aspects of lake history and catchment change through elemental, isotopic and molecular analysis of the sedimented organic matter (OM). In this sense, the objective of the present ... ...

    Abstract Paleolimnology of lake sediments can be a powerful tool to assess various aspects of lake history and catchment change through elemental, isotopic and molecular analysis of the sedimented organic matter (OM). In this sense, the objective of the present study was to investigate the source, depositional history and preservation of OM in the sediments of two different sites in Peri Lake (southern Brazil) to better understand the nature and direction of environmental changes. Therefore, two sediment cores were sampled and analysed for total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) concentrations and elemental ratios, and stable isotope ratios of C and N (δ(13)C and δ(15)N). Both cores showed similar general tendencies, with increasing amounts of OM (range 1-35%), TOC (2.55-258.40 mg g(-1)), TN (0.30-25.97 mg g(-1)) and TP (0.03-4.72 mg g(-1)) from the bottom toward the top more recent layers. TOC:TN ratios (range 8.1-14.7) showed a slight decrease in recent times and indicated a mixture of allochthonous and autochthonous contribution to the OM, with predominance of the last source. TN:TP (range 0.2-51.3) indicated a condition of potential limitation by P in general. Both δ(13)C (range -25.58 to -20.85) and δ(15)N (range 2.6 to 7.1) showed a decreasing pattern toward the top of the cores, in opposition to macronutrient concentration. Differences in the depth variation pattern between the two cores were associated to the marginal location of one of the cores. The results suggest that nutrients and primary production are increasing in the lake.
    MeSH term(s) Brazil ; Carbon Isotopes/analysis ; Environmental Monitoring ; Eutrophication ; Geologic Sediments/analysis ; Lakes/chemistry ; Nitrogen/analysis ; Nitrogen Isotopes/analysis ; Organic Chemicals/analysis ; Phosphorus/analysis
    Chemical Substances Carbon Isotopes ; Nitrogen Isotopes ; Organic Chemicals ; Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2015-08
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 782621-7
    ISSN 1573-2959 ; 0167-6369
    ISSN (online) 1573-2959
    ISSN 0167-6369
    DOI 10.1007/s10661-015-4726-9
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  9. Article ; Online: Urbanization increases carbon concentration and pCO

    das Neves Lopes, Michelle / Decarli, Cleiton Juarez / Pinheiro-Silva, Lorena / Lima, Thiago Cesar / Leite, Nei Kavaguichi / Petrucio, Mauricio Mello

    Environmental science and pollution research international

    2020  Volume 27, Issue 15, Page(s) 18371–18381

    Abstract: Urbanization growth may alter the hydrologic conditions and processes driving carbon concentrations in aquatic systems through local changes in land use. Here, we explore dissolved carbon concentrations (DIC and DOC) along urbanization gradient in Santa ... ...

    Abstract Urbanization growth may alter the hydrologic conditions and processes driving carbon concentrations in aquatic systems through local changes in land use. Here, we explore dissolved carbon concentrations (DIC and DOC) along urbanization gradient in Santa Catarina Island to evaluate potential increase of CO
    MeSH term(s) Carbon ; Rivers ; Urbanization
    Chemical Substances Carbon (7440-44-0)
    Language English
    Publishing date 2020-03-18
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-020-08175-8
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  10. Article ; Online: Spatial and temporal dynamic of trophic relevant parameters in a subtropical coastal lagoon in Brazil.

    Hennemann, Mariana Coutinho / Petrucio, Mauricio Mello

    Environmental monitoring and assessment

    2010  Volume 181, Issue 1-4, Page(s) 347–361

    Abstract: Coastal lagoons are ecologically and economically important environments but a relative low number of studies were carried out in subtropical and permanently closed coastal lagoons. The present study aimed at assessing the temporal and spatial dynamic of ...

    Abstract Coastal lagoons are ecologically and economically important environments but a relative low number of studies were carried out in subtropical and permanently closed coastal lagoons. The present study aimed at assessing the temporal and spatial dynamic of trophic relevant water quality parameters in the small, deep and freshwater Peri coastal lagoon, South Brazil. During the 19 sampled months (March/2008-September/2009) spatial homogeneity (horizontal and vertical) was registered in all seasons for all variables, a condition related to the strong wind influence and low human occupation in the lagoon watershed. Seasonal variations of the water quality could be observed and they can be explained mainly by variation on temperature, wind forces and direction and rainfall, characteristic from the subtropical weather. Comparing this study with two others conducted in Peri lagoon in 1996 and 1998, no critical differences that evidence alteration in the water quality were found, but climate differences may have influenced in some small variations observed. The use of four trophic state indices indicated that indices designed for temperate lakes are inappropriate for the subtropical Peri lagoon. The lagoon was classified as oligotrophic for nutrients concentrations and meso-eutrophic for transparency and chlorophyll-a, which can be explained by the high densities and monodominance of the cyanobacterium Cylindrospermopsis raciborskii and the high recycling rates observed in warmer water bodies, when compared to the temperate ones.
    MeSH term(s) Brazil ; Cyanobacteria/growth & development ; Ecosystem ; Environmental Monitoring/methods ; Eutrophication ; Food Chain ; Seasons ; Seawater/chemistry ; Seawater/microbiology ; Water Pollutants, Chemical/analysis ; Water Pollution, Chemical/statistics & numerical data
    Chemical Substances Water Pollutants, Chemical
    Language English
    Publishing date 2010-12-30
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 782621-7
    ISSN 1573-2959 ; 0167-6369
    ISSN (online) 1573-2959
    ISSN 0167-6369
    DOI 10.1007/s10661-010-1833-5
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