Vacúolos de gás e flutuação em Difflugia mitriformis Wallich (Protista, Rhizopoda, Testaceolobosea)

Torres, Vladimir Stolzenberg

doi:10.1590/s0101-81751996000100006

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…However, the continuous water flow of rivers appears to facilitate their daily integration into the water column habitat from the substrate and associated vegetation (Alves et al., ; Lansac‐Tôha, Velho, & Bonecker, ; Velho, Lansac‐Tôha, & Bini, , ). The annual flooding process that occurs naturally in the Madeira River may further promote this phenomenon by aiding the dispersal of littoral organisms into the river (Torres, ). These factors associated with river flow may explain the high density of testate amoebae recorded during the flooding hydrological period, especially prior to damming.…”

Section: Discussionmentioning

confidence: 99%

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

et al. 2019

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Flow modification of lotic ecosystems is one of the main threats to global freshwater biodiversity. Commonly, and in the river studied here, modification results from hydroelectric dam installation. We evaluated the impacts of damming on zooplankton communities in the Amazonian floodplain of the Madeira River (Porto Velho, Rondônia, Brazil) following construction in 2012 of the run‐of‐river dam of Jirau Hydroelectric Power Plant. Using data sampled between 2009 and 2015, we tested for discontinuities in zooplankton community composition attributable to damming and the naturally occurring flood pulse. The flood pulse remained the main predictor explaining variation in zooplankton community structure even with the installation of the dam on the Madeira River. Despite this, discontinuities for the entire zooplankton community and for the main compositional groups (testate amoebae, rotifers, cladocerans, and copepods) were detected in relation to the dam (pre‐/post‐dam periods), mainly in ebb and low water, and with weaker evidence of dam effects during flood and highwater hydrological periods. A multivariate regression tree explained 9.6% of the variation in zooplankton communities and identified four groups: (1) flood and high‐water periods; (2) low water post‐dam; (3) low water pre‐dam; and (4) ebb hydrological periods. The deviance in each multivariate regression tree node was attributable to variation in eight rotifer, three testate amoeba, and three copepod taxa. Our study demonstrates that the flood pulse, dam construction, and interaction between both of these factors affect zooplankton community structure in the Madeira River. While for many zooplankton community variables, effects occurred mainly during ebb and low‐water periods, some effects were also observed during high water and flood periods. We thus recommend the establishment of a permanent environmental monitoring programme during all hydrological periods in tropical floodplain rivers and the addition of sampling sites downstream from dams. Many rivers in the world are increasingly disrupted by multiple dams, yet little is known of their effects, especially for run‐of‐river dams. Our study identified short‐term impacts of only one run‐of‐river dam on zooplankton communities. More research is needed on the effects of multiple run‐of‐river dams on zooplankton and other biota, especially in tropical floodplain rivers, so that negative effects can be understood and ameliorated.

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Section: Discussionmentioning

confidence: 99%

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

et al. 2019

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Biodiversity of testate amoebae (Arcellinida and Euglyphida) in different habitats of a lake in the Upper Paraná River floodplain

Alves

Velho

Simões

et al. 2010

European Journal of Protistology

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Estudos sobre Difflugia lobostoma Leidy (Protista, Rhizopoda, Testacealobosea)

Torres

1996

Rev. Bras. Zool.

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ABSTRACT. SruDLES ABOUT DIFFLUG/A WBOSTOM.J LEIDY (PROTISTA, RHIZOPODA, TESTACEALOBOSEA). This paper repor!s feeding habitats, mos! commom test constitution, and growing curvature obtained under cultivation conditions, and lhe knowing distribution and most commom DifJlugia lobostoma.KEYWORDS. DifJlugia lobostoma, cultivation, growing curvature, Protista.Atualmente DifJlugia lobostoma é certamente um dos testáceos mais conhecidos em todo o mundo (PROWAZEK 1910;RUA 1912;PINTO 1925; GAUTIERLrEvRE & THOMAS 1958;THOMAS 1959; DroNI 1970; VUCETICH 1970 VUCETICH , 1972 VUCETICH , 1973a VUCETICH ,b, 1976 VUCETICH ,1978GREEN 1975;OGDEN & HEDLEY 1980;CHARDEZ 1967 CHARDEZ , 1975 CHARDEZ , 1987 CHARDEZ ,1990SABRI 1988;CHARDEZ et a!. 1989; TORRES & JEBRAM 1994), apresentando uma testa aglutinada de partículas inorgânicas sobre em substrato orgânico. GAUTIER-LrEvRE & THOMAS (1958) chegam a afirmar que este protista é cosmopolita.Dos trabalhos anteriormente citados, a grandc maioria é de caráter sistemá-tico, como CHARDEZ (1987) que cita três variedades raras ocorrentes na Bélgica porém, os que apresentam uma outra conotação, como CHARDEZ et a!. (1989), que apresenta um aspecto limnológico e SABRl (1988) que faz um estudo ecológico.A importância desta espécie, do ponto de vista sistemático e especialmente ecológico, representa o objetivo e a justificativa para a realização de um estudo específico a respeito da mesma.

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Vacúolos de gás e flutuação em Difflugia mitriformis Wallich (Protista, Rhizopoda, Testaceolobosea)

Cited by 4 publications

References 5 publications

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

Damming interacts with the flood pulse to alter zooplankton communities in an Amazonian river

Biodiversity of testate amoebae (Arcellinida and Euglyphida) in different habitats of a lake in the Upper Paraná River floodplain

Estudos sobre Difflugia lobostoma Leidy (Protista, Rhizopoda, Testacealobosea)

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