Invertebrates associated with Paspalum repens (Poaceae) at the mouth of Caracu Stream (1991-1992), affluent of the Paraná River, Porto Rico - PR - Brazil

Souza-Franco, Gilza Maria de; Takeda, Alice Michiyo

doi:10.1590/s1516-89132000000300012

Cited by 9 publications

(6 citation statements)

References 8 publications

(5 reference statements)

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“…According to Pinder (1986), the presence of aquatic macrophytes in aquatic ecosystems can result in an increase in the surface area for the colonisation of invertebrates; this has been confirmed by Poi de Neiff & Carignan (1997) and Souza-Franco & Takeda (2000). Frequency of occurrence Aquatic macrophytes can be used as a substrate for the deposition of eggs (mainly of insects), as a refuge for various groups and can also contribute, with the formation of detritus, to create new microhabitats.…”

Section: Discussionmentioning

confidence: 85%

Spatial and temporal variation in densities of chironomid larvae (Diptera) in two lagoons and two tributaries of the upper Paraná River floodplain, Brazil

Higuti

Takeda

2002

Braz. J. Biol.

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Chironomid larvae were collected and abiotic variables measured at monthly intervals at 21 sampling stations in two lagoons (Guaraná and Patos) and two tributaries (Baía and Ivinheima) of the Upper Paraná River floodplain. The genera Procladius, Chironomus, Goeldichironomus, and Polypedilum were dominant in the lagoons and in the Baía River, while Cryptochironomus and Lopescladius were more dominant in the Ivinheima River. The similarity in the generic composition of the chironomids of the lagoons and the Baía River is probably due to the fact that this river presents hydrodynamic characteristics similar to those of the lagoons. The results obtained suggest that the hydrodynamics of these environments are the main factor determining spatial variation in the chironomid fauna. This is intuitively clear, as this factor itself determines sediment type, quantity of organic matter and presence or absence of aquatic macrophytes. However, on a seasonal scale, the flood pulse seems to be the main controlling factor of the temporal variation in densities and dominance of chironomid larvae. Given that this factor has a large influence on the temporal dynamics of several limnological variables, this is again a logical correlation. Our results suggest a strong relationship between the variations in the chironomid community and fluctuations in limnological characteristics.Key words: Chironomidae, zoobenthos, floodplain, spatial and temporal variation. RESUMOVariação espacial e temporal da densidade de larvas de quironomídeos (Diptera) em duas lagoas e dois tributários da planície de inundação do alto rio Paraná, Brasil Foram coletadas larvas de quironomídeos e medidas as variáveis abióticas, mensalmente, em 21 pontos distribuídos em duas lagoas (Guaraná e Patos) e dois tributários (Baía e Ivinheima) da planície de inundação do alto rio Paraná. Os gêneros Procladius, Chironomus, Goeldichironomus e Polypedilum foram dominantes nas lagoas e no rio Baía, enquanto Cryptochironomus e Lopescladius dominaram no rio Ivinheima. Essa semelhança na composição genérica de quironomídeos nas lagoas e no rio Baía provavelmente se deve ao fato de esse rio apresentar características hidrodinâmicas mais similares às das lagoas. Os resultados obtidos sugerem que a hidrodinâmica desses ambientes é o principal fator determinante na variação espacial da fauna de quironomídeos. Obviamente, esse fator determina o tipo de sedimento, teor de matéria orgânica e presença ou ausência de macrófitas aquáticas. No entanto, sazonalmente, o pulso de inundação parece ser o principal fator controlador da variação temporal da densidade e da dominância das larvas de quironomídeos. Tendo em vista que esse fator tem grande influência na dinâmica temporal das variáveis limnológicas, isso é novamente uma correlação lógica. Os resultados sugerem forte relação entre as variações na comunidade de quironomídeos e as flutuações nas características limnológicas.Palavras-chave: Chironomidae, zoobentos, planície, variação espacial e temporal.

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Section: Discussionmentioning

confidence: 85%

Spatial and temporal variation in densities of chironomid larvae (Diptera) in two lagoons and two tributaries of the upper Paraná River floodplain, Brazil

Higuti

Takeda

2002

Braz. J. Biol.

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“…This is caused by a reduction in the occurrence of emergent, rooted with floating stems and rooted-submersed canopy-forming life forms, as demonstrated by logistic regression. Because of heterogeneity in structure or architecture, a mixture of different life forms provides a higher overall habitat heterogeneity, which is considered as one of the main determinants of invertebrate and fish diversity in littoral zones (Bonecker et al, 1998;Souza-Franco & Takeda, 2000;Vieira et al, 2007;Pelicice et al, 2008). Thus, we suppose that the reduction of FR caused by tropical signalgrass may also have negative consequences for organisms higher in the food web, probably reducing their density and diversity.…”

Section: Discussionmentioning

confidence: 99%

“…Because of heterogeneity in structure or architecture, a mixture of different life forms provides a higher overall habitat heterogeneity, which is considered as one of the main determinants of invertebrate and fish diversity in littoral zones (Bonecker et al. , 1998; Souza‐Franco & Takeda, 2000; Vieira et al. , 2007; Pelicice et al.…”

Section: Discussionmentioning

confidence: 99%

Effects of an exotic invasive macrophyte (tropical signalgrass) on native plant community composition, species richness and functional diversity

et al. 2010

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1. The issue of freshwater species being threatened by invasion has become central in conservation biology because inland waters exhibit the highest species richness per unit area, but apparently have the highest extinctions rates on the planet. 2. In this article, we evaluated the effects of an exotic, invasive aquatic grass (Urochloa subquadripara -tropical signalgrass) on the diversity and assemblage composition of native macrophytes in four Neotropical water bodies (two reservoirs and two lakes). Species cover was assessed in quadrats, and plant biomass was measured in further quadrats, located in sites where tropical signalgrass dominated (D quadrats) and sites where it was not dominant or entirely absent (ND quadrats). The effects of tropical signalgrass on macrophyte species richness, Shannon diversity and number of macrophyte life forms (a surrogate of functional richness) were assessed through regressions, and composition was assessed with a DCA. The effects of tropical signalgrass biomass on the likelihood of occurrence of specific macrophyte life forms were assessed through logistic regression. 3. Tropical signalgrass had a negative effect on macrophyte richness and Shannon and functional diversity, and also influenced assemblage composition. Emergent, rooted with floating stems and rooted submersed species were negatively affected by tropical signalgrass, while the occurrence of free-floating species was positively affected. 4. Our results suggest that competition with emergent species and reduction of underwater radiation, which reduces the number of submersed species, counteract facilitation of free-floating species, contributing to a decrease in plant diversity. In addition, homogenisation of plant assemblages shows that tropical signalgrass reduces the beta diversity in the macrophyte community. 5. Although our results were obtained at fine spatial scales, they are cause for concern because macrophytes are an important part of freshwater diversity.

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“…A pesar de su importancia, las macrófitas en humedales están amenazadas globalmente, lo que representa un riesgo para la conservación tanto de las plantas acuáticas como de los ecosistemas que sostienen (O'Hare et al, 2018;Zhang et al, 2017). Muchos estudios se han desarrollado en el río Paraná en su tramo argentino-brasilero acerca de las macrófitas como hábitat para macroinvertebrados (Higuti et al, 2007;Paporello de Amsler, 1987;Souza Franco & Takeda 2000;Thomaz et al, 2008). Sin embargo, es aún poco conocido el efecto que la complejidad de hábitats generada por las macrófitas tiene sobre la densidad, riqueza, diversidad y biomasa de invertebrados pleustónicos en humedales aluviales del río Paraná Medio.…”

Section: Introductionunclassified

Relación entre los atributos de ensambles pleustónicos y la complejidad de hábitat generada por macrófitas en el río Paraná Medio

Facelli

Zilli

2019

bacuatica

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La complejidad de hábitats generada por macrófitas en ambientes acuáticos favorece la diversidad y producción de la biota. A pesar de la gran abundancia de macrófitas, existe escasa información en humedales aluviales del río Paraná. Nuestro objetivo fue determinar la relación de los atributos de ensambles de invertebrados pleustónicos con la complejidad de hábitat generada por los sustratos vegetales. Se recolectaron muestras en seis humedales en la llanura aluvial. Para determinar las medidas de complejidad de hábitat, se obtuvieron la biomasa, riqueza y dimensión fractal promedio de partes sumergidas de las macrófitas. Los invertebrados se identificaron y categorizaron en grupos funcionales, se contabilizaron y se obtuvo su biomasa por pesaje directo o empleando factores de corrección disponibles. Los atributos se relacionaron con la complejidad de hábitat empleando correlaciones lineales. Se registró una elevada diversidad, densidad y biomasa de taxones y de diferentes grupos funcionales de macroinvertebrados. Hubo una relación directa de la complejidad de hábitat con la riqueza y densidad del grupo de mayor especificidad por el sustrato vegetal (trituradores, herbívoros, raspadores) e indirecta con la densidad total y de recolectores. Concluimos que las macrófitas son generadoras de hábitat para diversos y abundantes macroinvertebrados en el río Paraná. Los atributos se relacionan con la complejidad de las partes sumergidas diferencialmente de acuerdo con su especificidad por el sustrato. Las macrófitas y losinvertebrados pleustónicos intervienen por deriva en diferentes procesos local y regionalmente, por lo que aportarían a la resiliencia del sistema río-llanura aluvial.

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Invertebrates associated with Paspalum repens (Poaceae) at the mouth of Caracu Stream (1991-1992), affluent of the Paraná River, Porto Rico - PR - Brazil

Abstract: ABSTRACT

Cited by 9 publications

References 8 publications

Spatial and temporal variation in densities of chironomid larvae (Diptera) in two lagoons and two tributaries of the upper Paraná River floodplain, Brazil

Spatial and temporal variation in densities of chironomid larvae (Diptera) in two lagoons and two tributaries of the upper Paraná River floodplain, Brazil

Effects of an exotic invasive macrophyte (tropical signalgrass) on native plant community composition, species richness and functional diversity

Relación entre los atributos de ensambles pleustónicos y la complejidad de hábitat generada por macrófitas en el río Paraná Medio

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