Estrutura da comunidade de algas perifíticas em Eleocharis acutangula (Roxb.) Schult (Cyperaceae) em reservatório tropical raso, São Paulo, SP, Brasil

Camargo, Vanessa Moraes; Ferragut, Carla

doi:10.1590/s2236-89062014000100003

Cited by 11 publications

(13 citation statements)

References 24 publications

(23 reference statements)

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“…and Eleocharis sp. retain greater amount of particulate material colonized by periphyton, epiphyton, aquatic invertebrates, and decomposer organisms such as bacteria and fungi (Thomaz & Bini, 2003;Hogsden et al, 2007;Thomaz & Cunha, 2010;Camargo & Ferragut, 2014). Those elements are the main food items of M. jelskii diet (Melo, 2003;Cirilo et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)

Silva

Oliveira

Rocha

2019

Iheringia, Sér. Zool.

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We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex ratio was biased towards females in M1 and did not deviate from 1:1 in M2 and M3. When prawns were separated into five categories we observed that non-ovigerous adult females were more abundant in M1, while adult males were the most abundant demographic category in M2 and M3. Juveniles of both sexes and ovigerous females showed no microhabitat preference, although M1 and M2 appeared to be more suitable for the latter. Adult females were the largest individuals in all microhabitats. Food availability, lower depth and lower predation pressure in M1 are the main factors that make M1 more suitable for M. jelskii, particularly non-ovigerous adult females and larger adult males. Intraspecific competition for shelter in M1 might also occur and adult females win this competition due to their larger body size. Therefore, adult males are found in higher abundance in M2 and M3 and the juvenile of both sexes spread evenly across all microhabitats. Our results help to understand the ecological role and the niche used by M. jelskii. Future studies on the habitat choice and predation under laboratory conditions should help to understand the behavior of this species.

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Section: Discussionmentioning

confidence: 99%

Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)

Silva

Oliveira

Rocha

2019

Iheringia, Sér. Zool.

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“…(84%), Eleocharis acutangula (Roxb.) Schult (68%) and Panicum repens L. (11%) (Pellegrini & Ferragut, 2012;Camargo & Ferragut, 2014;Casartelli & Ferragut, 2015). In addition, we also found that biomass maximum occurred after the exponential phase of biomass increment (dry season: 98th day; rainy season: 42nd day), which occurred between 20 and 35 days of colonization.…”

Section: Discussionmentioning

confidence: 57%

Periphyton biomass accrual rate changes over the colonization process in a shallow mesotrophic reservoir

2016

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Aim: We identified and analyzed the developmental phases (exponential and loss) of periphyton on artificial substrates based on biomass accrual rate in dry and rainy seasons in a shallow mesotrophic reservoir (Ninfeias Reservoir, Parque Estadual das Fontes do Ipiranga, São Paulo, Brazil). We evaluated the colonization time required for the developmental phase to change, as well as related limnological variables. Methods Samplings were carried out weekly, totaling 98 days of substrates exposure. We analyzed the limnological and periphyton variables (chlorophyll a, ash free dry mass, net and gross accrual rate). Results Maximum biomass occurred on the 42nd day in rainy season and on the 98th day in dry season. In the rainy season, the exponential phase of biomass accrual continued until the 28th day of colonization, followed by a fluctuation phase (35th to 77th day) and then a loss phase (84th to 98th days). In the dry season, the exponential phase continued until the 35th day, followed by a loss phase (42th to 63rd day) and then a fluctuation phase (70th and 77th day). In the same season, we observed the beginning of a new exponential phase (84th to 98th day). The biomass peak was recorded on the 42nd colonization day in the rainy season and on the 98th day in the dry season. Biomass and gross and net accrual were higher in the dry season than in the rainy season. Conclusions Periphyton biomass and net and gross accrual rates were higher during the dry season, which was characterized by high total nitrogen concentration, water transparency and low rainfall. We concluded that periphyton biomass accrual and the duration of the developmental phases (exponential, loss and fluctuation) changed with variations in limnological conditions in each climatic period in the tropical shallow reservoir studied.

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“…Camargo & Ferragut (2014) found that periphyton biomass and algal density in a shallow tropical reservoir were negatively correlated with macrophyte cover and phytoplankton chlorophyll-a, where the availability of nutrients in the water appeared to be less important to community organization. Therefore, studies on the association between detritivorous populations and the periphyton community are necessary.…”

Section: Discussionmentioning

confidence: 97%

“…Nevertheless, this process leads to an improvement in feeding conditions and available food sources for P. lineatus juveniles. However, the production of periphyton in the floodplains was reported as higher in receding waters and during drought periods (Taniguchi et al, 2005;Algarte et al, 2006;Carapurnarla et al, 2014) or in the Winter (Camargo & Ferragut, 2014), which also favors the bioavailability for this species.…”

Section: Discussionmentioning

confidence: 99%

Body condition and energy density of juvenile streaked prochilod Prochilodus lineatus (Valenciennes, 1837) in a Neotropical floodplain

2016

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Variations in energetic density (E D ) and the relative condition factor (K n ) of juveniles of Prochilodus lineatus were investigated to identify whether these two variables respond similarly to environmental factors. We hypothesized that fluviometric levels in different sub-basins of the Upper Paraná River floodplain positively influence the E D and K n of juvenile fish. Temporally, the values of E D and K n were linked more directly to the dynamics of the flood pulses on the plain. Spatially, the lowest values of E D and K n were observed in the environment that was directly affected by the operation of dams, the sub-basin Paraná. Although the energy density and condition factor did not show similar results for juveniles in some of the analyses, the evaluation of both parameters provided a complementary tool and additional information that enabled a more accurate investigation of the temporal and spatial dynamic processes in this Neotropical floodplain. We conclude that water level variations in different sub-basins of the Upper Paraná River floodplain considerably affect the relative condition factor and energy status of P. lineatus. We suggest that the impacts of this modification should be mitigated or avoided in order to maintain fish stocks and promote ecosystem integrity.Variações na densidade energética (E D ) e no fator de condição relativo (K n ) de juvenis de Prochilodus lineatus foram investigadas buscando identificar se estas duas variáveis respondem de forma semelhante aos fatores ambientais. Nossa hipótese é que o nível fluviométrico, em diferentes subsistemas da planície de inundação do alto rio Paraná, influencia positivamente o E D e K n de juvenis da espécie. Temporalmente, os valores de E D e K n estiveram relacionados mais diretamente a dinâmica de pulsos de inundação presente na planície. Espacialmente, os menores valores de E D e K n foram verificados no ambiente mais diretamente afetado pela operação das barragens, o subsistema Paraná. Apesar da densidade de energia e do fator de condição não demonstrarem resultados semelhantes para juvenis em algumas das análises, a avaliação de ambos os parâmetros forneceu uma ferramenta complementar e informações adicionais, que permitiu uma investigação mais detalhada dos processos dinâmicos temporais e espaciais nesta várzea neotropical. Conclui-se que a variação do nível de água, em diferentes subsistemas da planície de inundação do alto rio Paraná, afeta consideravelmente a condição corpórea e energética de P. lineatus. Nós sugerimos que impactos que modifiquem este efeito devem ser mitigados ou evitados para manter o estoque de peixes e promover a integridade do ecossistema.

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Estrutura da comunidade de algas perifíticas em Eleocharis acutangula (Roxb.) Schult (Cyperaceae) em reservatório tropical raso, São Paulo, SP, Brasil

Cited by 11 publications

References 24 publications

Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)

Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)

Periphyton biomass accrual rate changes over the colonization process in a shallow mesotrophic reservoir

Body condition and energy density of juvenile streaked prochilod Prochilodus lineatus (Valenciennes, 1837) in a Neotropical floodplain

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