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Papers by Danielle Petsch
Michelan et al (2014 - J Limnol)
Influência da heterogeneidade ambiental sobre os atributos da comunidade de Chironomidae em lagoas de inundação neotropicais
Iheringia. Série Zoologia, 2015
Brazilian Journal of Biology, 2015
Amphibians are hosts for a wide variety of ecto-and endoparasites, such as protozoans and parasit... more Amphibians are hosts for a wide variety of ecto-and endoparasites, such as protozoans and parasitic worms. Naididae is a family of Oligochaeta whose species live on a wide range of substrates, including mollusks, aquatic macrophytes, sponges, mosses, liverworts, and filamentous algae. However, some species are known as endoparasitic from vertebrates, such as Dero (Allodero) lutzi, which is parasitic of the urinary tracts of frogs, but also have a free-living stage. Specimens in the parasitic stage lack dorsal setae, branchial fossa, and gills. Here we report the occurrence of D. (A.) lutzi associated with anuran Scinax fuscovarius from Semi-deciduous Atlantic Rain Forest in southern Brazil. The study took place at the Caiuá Ecological Station, Diamante do Norte, Paraná, southern Brazil. Seven specimens of S. fuscovarius were examined for parasites but only one was infected. Parasites occurred in ureters and urinary bladder. Previous records of this D. (A.) lutzi include the Brazilian States of Santa Catarina, São Paulo, Rio de Janeiro, and Minas Gerais, as well as Cuba and North America. This is a new locality record for this species in Brazil. Reports of Dero (Allodero) lutzi are rare, due to difficulty of observation, and such events are restricted only the fortuitous cases. It is important to emphasize the necessity of future studies, which are fundamental to the understanding of biological and ecological aspects of this species.
Acta Scientiarum. Biological Sciences, 2015
We tested the hypothesis that the contribution of the nestedness component is higher in environme... more We tested the hypothesis that the contribution of the nestedness component is higher in environments with more similar features (lentic or lotic), whereas the contribution of the turnover component is higher in environments with more dissimilar features (lotic vs. lentic). To this end, we partitioned beta diversity of the Oligochaeta community into 12 environments of the Upper Paraná River floodplain. We recorded 986 individuals of 17 taxa. Through Redundancy Analysis, we observed a differentiation between lentic and lotic habitats both by environmental features as species composition. Our hypothesis was partially supported, because in environments with more similar hydrological characteristics, we observed a greater contribution of the nestedness component only in lentic environments, whereas in lotic environments, the turnover component showed a higher value. Moreover, when analyzed the different environments (lentic vs. lotic), we noticed a very similar contribution of both components. Some species were more frequent, as A. pigueti and P. americana, while others were exclusive to some environments (N. bonettoi and H. aedeochaeta). We evidenced the importance of each component in structuring Oligochaeta community, nonetheless, in a different way between environments with more similar (nestedness to lentic and turnover to lotic) or dissimilar (almost the same contribution of both) features.
Iheringia. Série Zoologia, 2014
The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has chara... more The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has characteristics typical of a floodplains. This protected area includes lagoons connected and disconnected to the Paraná River, although the latter also connect during periods of high water level, thus composing a heterogeneous group of lacustrine environments. The enormous potential the flora and fauna diversities are still little known to the region, as can be seen through benthic invertebrates, inclunding bivalves mollusks. The granulometric composition of these floodplain lagoons was formed mainly by mud and very fine sand. Furthermore, organic matter composition was predominantly of fine particulate. The other abiotic factors differed from lagoons located within the island of the park to those located in the left margin of Paraná River. The results demonstrated the importance of abiotic factors such as the physical composition of granulometric texture, organic matter and macrophyte banks, to the establishment of bivalves in these floodplain lagoons. We recorded bivalves of Pisidium (native), Diplodon (native), and Corbicula (invasive).
Biotemas, 2013
Um dos temas centrais em ecologia é a importância relativa dos processos locais e regionais na de... more Um dos temas centrais em ecologia é a importância relativa dos processos locais e regionais na determinação da estrutura de comunidades, pois ambos os processos podem agir como filtros na composição das comunidades locais. Nesse sentido, este estudo analisou a influência dos fatores ambientais sobre a distribuição da comunidade de invertebrados bentônicos em diferentes canais da planície de inundação do alto rio Paraná, por meio de coletas trimestrais realizadas de março a dezembro de 2010. A partir de dados bióticos e abióticos foi realizada uma Análise de Correspondência Canônica, onde foi possível agrupar os centros dos rios Ivinhema e Paraná e do canal Ipoitã em relação aos demais pontos, principalmente pelos maiores valores de profundidade e velocidade e pelos táxons típicos de ambientes lóticos, como Harpacticoida, Haplotaxidae e Narapidae, e o centro do canal Curutuba, com L. fortunei. Pode-se concluir que a velocidade de fluxo, a textura granulométrica e a matéria orgânica do sedimento foram fatores estruturadores da comunidade bentônica, determinando a distribuição dos invertebrados tanto entre os diferentes canais como entre as regiões marginais e centrais desses ambientes, proporcionando maior ou menor disponibilidade de recursos e heterogeneidade ambiental.
Temporal nestedness in Chironomidae and the importance of environmental and spatial factors in species rarity
Hydrobiologia, 2014
The invasive aquatic macrophyte Hydrilla verticillata facilitates the establishment of the invasive mussel Limnoperna fortunei in Neotropical reservoirs
The effects of introduced species on native species have been widely studied, however, invader-in... more The effects of introduced species on native species have been widely studied, however, invader-invader interactions are still poorly
explored. Two non-native invasive species, the bivalve Limnoperna fortunei and the submersed macrophyte Hydrilla verticillata, have
infested many aquatic ecosystems worldwide, and they are rapidly becoming nuisances in several water bodies in Brazil. We tested the
hypothesis that H. verticillata facilitates the establishment of L. fortunei more than do native macrophytes. We surveyed mussels attached
to two native macrophytes and to this invasive macrophyte in three Brazilian reservoirs and compared the length, density and biomass
of the attached mussels relative to the host macrophyte species. All of the values of these attributes in L. fortunei were higher in the
mussels attached to H. verticillata than in those attached to the native macrophytes. These results supported our initial hypothesis
because the settlement of L. fortunei appeared to be facilitated by the invasive macrophyte, allowing higher abundances of the mussels
as well as the more effective establishment of the mussel population. Various mechanisms could interact to facilitate the superior performance
of L. fortunei in the invasive plant. H. verticillata is more flexible and withstands more mussels without breaking. Furthermore,
this plant has different attached algae, which may be more beneficial for mussels. Thus, as a response to the facilitation suggested by
our work, the mussel has greater opportunities to succeed in habitats colonised by the non-native H. verticillata. Although we have not
evaluated the effects of this facilitation on aquatic communities or the ecosystem, our results could represent the first step of an invasional
meltdown.
Michelan et al (2014 - J Limnol)
Influência da heterogeneidade ambiental sobre os atributos da comunidade de Chironomidae em lagoas de inundação neotropicais
Iheringia. Série Zoologia, 2015
Brazilian Journal of Biology, 2015
Amphibians are hosts for a wide variety of ecto-and endoparasites, such as protozoans and parasit... more Amphibians are hosts for a wide variety of ecto-and endoparasites, such as protozoans and parasitic worms. Naididae is a family of Oligochaeta whose species live on a wide range of substrates, including mollusks, aquatic macrophytes, sponges, mosses, liverworts, and filamentous algae. However, some species are known as endoparasitic from vertebrates, such as Dero (Allodero) lutzi, which is parasitic of the urinary tracts of frogs, but also have a free-living stage. Specimens in the parasitic stage lack dorsal setae, branchial fossa, and gills. Here we report the occurrence of D. (A.) lutzi associated with anuran Scinax fuscovarius from Semi-deciduous Atlantic Rain Forest in southern Brazil. The study took place at the Caiuá Ecological Station, Diamante do Norte, Paraná, southern Brazil. Seven specimens of S. fuscovarius were examined for parasites but only one was infected. Parasites occurred in ureters and urinary bladder. Previous records of this D. (A.) lutzi include the Brazilian States of Santa Catarina, São Paulo, Rio de Janeiro, and Minas Gerais, as well as Cuba and North America. This is a new locality record for this species in Brazil. Reports of Dero (Allodero) lutzi are rare, due to difficulty of observation, and such events are restricted only the fortuitous cases. It is important to emphasize the necessity of future studies, which are fundamental to the understanding of biological and ecological aspects of this species.
Acta Scientiarum. Biological Sciences, 2015
We tested the hypothesis that the contribution of the nestedness component is higher in environme... more We tested the hypothesis that the contribution of the nestedness component is higher in environments with more similar features (lentic or lotic), whereas the contribution of the turnover component is higher in environments with more dissimilar features (lotic vs. lentic). To this end, we partitioned beta diversity of the Oligochaeta community into 12 environments of the Upper Paraná River floodplain. We recorded 986 individuals of 17 taxa. Through Redundancy Analysis, we observed a differentiation between lentic and lotic habitats both by environmental features as species composition. Our hypothesis was partially supported, because in environments with more similar hydrological characteristics, we observed a greater contribution of the nestedness component only in lentic environments, whereas in lotic environments, the turnover component showed a higher value. Moreover, when analyzed the different environments (lentic vs. lotic), we noticed a very similar contribution of both components. Some species were more frequent, as A. pigueti and P. americana, while others were exclusive to some environments (N. bonettoi and H. aedeochaeta). We evidenced the importance of each component in structuring Oligochaeta community, nonetheless, in a different way between environments with more similar (nestedness to lentic and turnover to lotic) or dissimilar (almost the same contribution of both) features.
Iheringia. Série Zoologia, 2014
The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has chara... more The Ilha Grande National Park, Paraná, Brazil, is located in the Upper Paraná River and has characteristics typical of a floodplains. This protected area includes lagoons connected and disconnected to the Paraná River, although the latter also connect during periods of high water level, thus composing a heterogeneous group of lacustrine environments. The enormous potential the flora and fauna diversities are still little known to the region, as can be seen through benthic invertebrates, inclunding bivalves mollusks. The granulometric composition of these floodplain lagoons was formed mainly by mud and very fine sand. Furthermore, organic matter composition was predominantly of fine particulate. The other abiotic factors differed from lagoons located within the island of the park to those located in the left margin of Paraná River. The results demonstrated the importance of abiotic factors such as the physical composition of granulometric texture, organic matter and macrophyte banks, to the establishment of bivalves in these floodplain lagoons. We recorded bivalves of Pisidium (native), Diplodon (native), and Corbicula (invasive).
Biotemas, 2013
Um dos temas centrais em ecologia é a importância relativa dos processos locais e regionais na de... more Um dos temas centrais em ecologia é a importância relativa dos processos locais e regionais na determinação da estrutura de comunidades, pois ambos os processos podem agir como filtros na composição das comunidades locais. Nesse sentido, este estudo analisou a influência dos fatores ambientais sobre a distribuição da comunidade de invertebrados bentônicos em diferentes canais da planície de inundação do alto rio Paraná, por meio de coletas trimestrais realizadas de março a dezembro de 2010. A partir de dados bióticos e abióticos foi realizada uma Análise de Correspondência Canônica, onde foi possível agrupar os centros dos rios Ivinhema e Paraná e do canal Ipoitã em relação aos demais pontos, principalmente pelos maiores valores de profundidade e velocidade e pelos táxons típicos de ambientes lóticos, como Harpacticoida, Haplotaxidae e Narapidae, e o centro do canal Curutuba, com L. fortunei. Pode-se concluir que a velocidade de fluxo, a textura granulométrica e a matéria orgânica do sedimento foram fatores estruturadores da comunidade bentônica, determinando a distribuição dos invertebrados tanto entre os diferentes canais como entre as regiões marginais e centrais desses ambientes, proporcionando maior ou menor disponibilidade de recursos e heterogeneidade ambiental.
Temporal nestedness in Chironomidae and the importance of environmental and spatial factors in species rarity
Hydrobiologia, 2014
The invasive aquatic macrophyte Hydrilla verticillata facilitates the establishment of the invasive mussel Limnoperna fortunei in Neotropical reservoirs
The effects of introduced species on native species have been widely studied, however, invader-in... more The effects of introduced species on native species have been widely studied, however, invader-invader interactions are still poorly
explored. Two non-native invasive species, the bivalve Limnoperna fortunei and the submersed macrophyte Hydrilla verticillata, have
infested many aquatic ecosystems worldwide, and they are rapidly becoming nuisances in several water bodies in Brazil. We tested the
hypothesis that H. verticillata facilitates the establishment of L. fortunei more than do native macrophytes. We surveyed mussels attached
to two native macrophytes and to this invasive macrophyte in three Brazilian reservoirs and compared the length, density and biomass
of the attached mussels relative to the host macrophyte species. All of the values of these attributes in L. fortunei were higher in the
mussels attached to H. verticillata than in those attached to the native macrophytes. These results supported our initial hypothesis
because the settlement of L. fortunei appeared to be facilitated by the invasive macrophyte, allowing higher abundances of the mussels
as well as the more effective establishment of the mussel population. Various mechanisms could interact to facilitate the superior performance
of L. fortunei in the invasive plant. H. verticillata is more flexible and withstands more mussels without breaking. Furthermore,
this plant has different attached algae, which may be more beneficial for mussels. Thus, as a response to the facilitation suggested by
our work, the mussel has greater opportunities to succeed in habitats colonised by the non-native H. verticillata. Although we have not
evaluated the effects of this facilitation on aquatic communities or the ecosystem, our results could represent the first step of an invasional
meltdown.