Diss. (sammanfattning) Stockholm : Karol inst., 2003. / Härtill 4 uppsatser.

Made available in DSpace on 2016-06-02T19:31:36Z (GMT). No. of bitstreams: 1 DissSCE.pdf: 723485 bytes, checksum: 1757119ef02fa2dba80ba1297f9fd16b (MD5) Previous issue date: 2006-08-29 / The studied lake (Lagoa Mayaca) is located in a preservation area at the campus of the Universidade Federal de São Carlos. With the aim of analyzing the dynamic and the taxonomic composition of the Chironomidae, samples were taken through a transversal transect in two different periods (dry and wet season), comprehending the phenological cycle of Mayaca fluviatilis Aublet, 1775. From a total of 27 Chironomidae taxa, it was verified that the most abundant taxa in the dry season were: Cladopelma, Caladomyia sp1, Caladomyia riotarumensis, Djalmabatista pulcher, Ablablesmyia (Karelia), Tanytarsus rhabdomantis e Labrundinia. On the other hand, in the wet season the most representative were: Polypedilum (Asheum), Chironomus, Goeldichironomus, Endotribelos, Tanytarsus rhabdomantis, Caladomyia friederi, Ablablesmyia (Karelia), Labrundinia e Cricotopus. The greater taxonomic richness and number of specimens were registered in the sampled sites where Mayaca fluviatilis was present, indicating that the presence of this macrophyte was very important for structuring the studied community. / A lagoa estudada (Lagoa Mayaca) situa-se em uma área de preservação, dentro do campus da Universidade Federal de São Carlos. Com o objetivo de analisar a composição e a dinâmica taxonômica de Chironomidae, as coletas foram realizadas ao longo de um transecto transversal, em duas épocas distintas (estação de seca e de chuva), compreendendo o ciclo fenológico de Mayaca fluviatilis Aublet, 1775. Do total de 27 táxons de Chironomidae identificados, constatou-se que numericamente os táxons mais representativos para o período de estiagem foram: Cladopelma, Caladomyia sp1, Caladomyia riotarumensis, Djalmabatista pulcher, Ablablesmyia (Karelia), Tanytarsus rhabdomantis e Labrundinia. Já no período de chuva destacaram-se Polypedilum (Asheum), Chironomus, Goeldichironomus, Endotribelos, Tanytarsus rhabdomantis, Caladomyia friederi, Ablablesmyia (Karelia), Labrundinia e Cricotopus. A maior riqueza taxonômica e número de exemplares foram registrados nos pontos amostrais com presença de Mayaca fluviatilis, indicando que a presença desta macrófita foi de fundamental importância na estruturação da comunidade de larvas de Chironomidae estudada.

As comunidades bentônicas são relevantes nos ecossitemas aquáticos devido ao seu papel no funcionamento dos ecossistemas e também como mercadores ou indicadores de paleocondições. Sua distinção, similarmente à de outras comunidades, estão condicionadas por fatores abióticos e pela interação entre eles, determinando a estrutura da comunidade que se estabelecerá. Pelo presente trabalho objetivou-se determinar a composição taxonômica, a abundância e a distribuição espacial da comunidade bentônica, amostrando-se em 20 pontos na lagoa do Caçó. Um total de 14 pontos foram estabelecidos na região litorânea (7 na margem esquerda e 7 na margem direita) e 6 na região limnética. A variação sazonal em parâmetros da comunidade e também das características físicas e químicas da água e do sedimento foram analisadas e relacionadas aos deslocamentos da Zona de Convergência Intertropical. A lagoa do Caçó está localizada ao Norte do Estado do Maranhão e possui aproximadamente 5 km de comprimento e largura média de 500 metros. As coletas foram realizadas em abril (período chuvoso) e novembro (período seco) de 1999. Pelos resultados obtidos, ficam evidentes as diferenças tanto na riqueza de táxons quanto na diversidade de espécies e na densidade das populações em função da sazonalidade. A diversidade, a riqueza e a densidade foram maiores no período seco do que no período chuvoso. A família Chironimidae (Diptera Insecta) foi o mais importante componente da comunidade, representando aproximadamente 50% do total da fauna bentônica da lagoa. O sedimento da Lagoa do Caçó tem baixo conteúdo de matéria orgânica, sendo classificado como mineral. A análise da composição granulométrica mostrou que o sedimento é heterogêneo, sendo arenoso na margem esquerda, predominantemente argiloso na margem direita e limo arenoso e argiloso na região limnética. Em relação às variáveis limnológicas, observaram-se microestratificações térmicas e ) químicas. Os índices tróficos aplicados permitiram classificar a lagoa do Caçó como oligotrófico. A alternância dos períodos seco e chuvoso atuou como a principal função de força condicionado as alterações nas condições físicas e químicas da água bem como na comunidade bentônica no ano de 1999. Além disso, a identificação dos Chironomidae atuais da lagoa do Caçó até o nível de gênero, e o fato deste grupo produzir remanescentes fossilizáveis os tornam bons marcadores paleolimnológicos e paleoclimáticos que podem ser utilizados para inferir sobre as condições lacustres e climáticas passadas. / Benthic communities are relevant in aquatic ecosystems due to their role in the ecosystem functioninq and also as rnarkers or indicators of paleoconditions. Their distribution, similarly to other communities, is conditioned by abiotic and biotic factors and to their interactions, which determine the structure of the community that will be established. The present work aimed to determine the taxonomic composition, the abundance and spatial distribution of the benthic community, by collecting at 20 sampling points in Caçá Lake. A total of 14 points were located in the littoral region (7 on the right margin and 7 on the left one) and 6 in the limnetic zone. Seasonal variation on community parameters and also of chemical and physical characteristics of water and sediment were analysed and related to the seasonal displacement of the Intertropical Convergence Zone. Caçó Lake is located at the North of Maranhão State and it has approximately 5 km of length and 500m mean width. Sampling was carried out in April (rainy season) and November (dry season). The results evidenced that there are differences in the richness of taxa, diversity and density of benthic species that are mainly related to the seasonality. The diversity, richness and density were higher in the dry than in the rainy period. The family Chironomidae (Diptera, Insecta) was the most important component of the community representing approximately 50% of the total benthic fauna of the lake. The sediment of Caçá Lake has low organic content being classified as a mineral one. The granulometric composition shows that the sediment is heterogeneous being sandy at the left margin, clayey in the right margin and sandy-clayey in the limnetic zone. In relation to the limnological variables, thermal and chemical (pH, dissolved oxygen and temperature) micro-stratifications were observed for both periods sampled. The trophic state indices applied have allowed to classifv Lake Caçá as an oligotrophic lake. The alternation of dry and rainy periods can be considered the main forcing function causing the changes in physical and chemical water characteristics as well on benthic community in the year 1999. The identification of the present Chironomidae at the genus level and the fact that this group does produce fossilizing remains make them good paleolimnological and paleoclimatic tracers that may be used to infer on past lake and climate conditions.

Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-05-10T14:10:53Z No. of bitstreams: 1 niloneliocaixeirostephan.pdf: 1741825 bytes, checksum: 6408211e67715fd4b8f84ef92afb203d (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-17T15:07:38Z (GMT) No. of bitstreams: 1 niloneliocaixeirostephan.pdf: 1741825 bytes, checksum: 6408211e67715fd4b8f84ef92afb203d (MD5) / Made available in DSpace on 2017-05-17T15:07:38Z (GMT). No. of bitstreams: 1 niloneliocaixeirostephan.pdf: 1741825 bytes, checksum: 6408211e67715fd4b8f84ef92afb203d (MD5) Previous issue date: 2007 / FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais / Para se conhecer a variação espacial e temporal da fauna de Oligochaeta e insetos aquáticos e utilizar as informações obtidas para caracterizar a qualidade ambiental da subbacia do Córrego São Pedro (integrante da bacia de drenagem do Rio Paraibuna, em Juiz de Fora, Minas Gerais) foram realizadas, entre maio de 2005 e maio de 2006, coletas do sedimento em cinco pontos ao longo deste curso d’água, obtendo-se um total de 143359 espécimes distribuídas em 88 táxons. Os Oligochaeta foram representados por 4 famílias (Tubificidae, Naididae, Opistocystidae e Enchytraeidae) e 29 espécies. A família Tubificidae, a mais abundante, foi constituída por 7 espécies, sendo Limnodrilus hoffmeisteri, a espécie de maior representatividade numérica. Nesta família, os indivíduos imaturos foram responsáveis por 57% da fauna total. Os insetos foram representados por 26 famílias, sendo Chironomidae a mais abundante. Os indivíduos do gênero Chironomus contribuíram com 98% da entomofauna. Resultado do teste não paramétrico de Kruskalwallis indicou existir diferenças significativas (P< 0,05) na composição e estrutura da fauna entre os pontos de coleta. Teste de sinais de Wilcoxon indicou que houve diferença significativa (p< 0,05) da fauna nos períodos seco e chuvoso. A estrutura e composição faunística, bem como as variáveis físicas e químicas analisadas mostraram a existência de impactos e alterações antrópicas na sub-bacia do Córrego São Pedro. / In order to obtain information about the spatial and temporal variation of Oligochaeta fauna and aquatic insects and to use this information to characterize the environmental quality of Córrego São Pedro Subbasin (which is part of the drainage basin of Paraibuna River, Juiz de Fora city, Minas Gerais state, Brazil) we collected sediment samples at 5 spots along the course of this river. Sampling was carried out between May 2005 and May 2006, and we gathered a total of 143359 species distributed among 88 taxa. Oligochaeta were represented by 4 families (Tubificidae, Naididae, Opistocystidae, and Enchytraeidae) and 29 species. The Tubificidae family, the most abundant one, was composed of 7 species, among which Limnodrilus hoffmeisteri was the most representative in number. Immature individuals made up 57% of the total Tubificidae fauna. Insects were represented by 26 families, among which Chironomidae was the most abundant. Individuals from the genus Chironomus made up 98% of the enthomofauna. The results of the non-parametric Kruskal-wallis test showed a significative difference (P<0.05) in composition and structure of the fauna between collection spots. The Wilcoxon signal test indicated a significative difference (p<0.05) for the fauna during dry and rainy periods. Faunistic structure and composition, as well as the physical and chemical variables analised showed the existence of anthropic impacts and changes in Córrego São Predro Subbasin.

Made available in DSpace on 2016-06-02T19:29:56Z (GMT). No. of bitstreams: 1 5136.pdf: 1469178 bytes, checksum: a0809686f5333526f7e5eb0a69d193b3 (MD5) Previous issue date: 2013-03-15 / Financiadora de Estudos e Projetos / With the purpose of elucidating some aspects concerning the importance of substrate spatial complexity to the ecology of Chironomidae (Diptera) family in Cerrado streams, three field experiments were carried out in Ipameri and Mimoso de Goiás Municipalities, Goiás State, Brazil. These experiments are described in three chapters that compose this thesis i) Temporal dynamics of Chironomidae (Diptera) larvae on substrates with different levels of spatial complexity and roughness in a Central Brazil stream; ii) Is substrate complexity important for Chironomidae (Diptera) larvae to resist hydrological disturbance?; iii) Influence of spatial complexity and roughness on Chironomidae (Diptera) assemblages. Artificial substrates with different complexity and roughness levels were fixed in bed streams for colonization of Chironomidae larvae. Samplings were taken after a period of 30 days. Results indicated that: i) Colonization of substrates by larvae was not influenced by substrate spatial complexity and no patterns of colonization were observed, considering the various ecological guilds; ii) Both complexity and roughness were not sufficient to maintain the abundance of these organisms, evidencing their sensibility to sudden rain events; iii) Spatial complexity and roughness of substrate influenced the structure of Chironomidade assemblages and were two important aspects to the diversity of these organisms. / Buscando esclarecer alguns aspectos a respeito da importância da complexidade espacial do substrato sobre a ecologia de Chironomidae (Diptera) em córregos de baixa ordem do Cerrado brasileiro, foram realizados três experimentos aqui apresentados em três capítulos: i) Dinâmica temporal de Chironomidae (Diptera) em substratos com diferentes complexidades e rugosidades em um riacho do Brasil Central; ii) A complexidade do substrato é importante para as larvas de Chironomidae (Diptera) resistirem à perturbação hídrica?; iii) Influência da complexidade espacial e da rugosidade na assembleia de Chironomidae (Diptera). Os experimentos foram realizados nos municípios de Ipameri e Mimoso de Goiás, ambos situados no Estado de Goiás. Para amostragem das larvas de Chironomidae foram utilizados substratos artificiais com diferentes níveis de complexidade e rugosidade fixados no leito dos riachos para colonização. De forma geral os resultados obtidos indicaram que: i) A colonização dos substratos pelas larvas não foi influenciada pela complexidade espacial do substrato, não sendo observados padrões de colonização, considerando as diferentes guildas ecológicas; ii) Tanto a complexidade quanto a rugosidade do substrato não foram suficientes para a manutenção da abundância das larvas de Chironomidae, evidenciando sua sensibilidade a eventos inesperados de chuva; iii) A complexidade espacial e a rugosidade do substrato afetam a estrutura da assembleia de Chironomidae, sendo dois importantes aspectos para a diversidade destes organismos.

Submitted by Dominick Jesus (dominickdejesus@hotmail.com) on 2016-02-04T19:17:45Z No. of bitstreams: 2 Tese_Lívia Maria Fusari.pdf: 9120704 bytes, checksum: b003596cbbeb04e19f7a805514b41b1a (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2016-02-04T19:17:45Z (GMT). No. of bitstreams: 2 Tese_Lívia Maria Fusari.pdf: 9120704 bytes, checksum: b003596cbbeb04e19f7a805514b41b1a (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2010-05-18 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Fundação de Amparo à Pesquisa do Estado do Amazonas - FAPEAM / The first reports of Chironomidae in sponges date from the beginning of the 20 th century, beginning with Xenochironomus Kieffer and Demeijerea Kruseman in North America. Since then, few species in these genera have been described and it was not until 2004 that a species in another genus (Oukuriella Epler) was reported as having larvae living in freshwater sponges in the Neotropical region. In this study, we review current knowledge of Chironomidae in freshwater sponges and add new taxonomic and ecological information on these insects. In Brazil, only two genera have so far been observed in association with freshwater sponges: Xenochironomus and Oukuriella. The first of these genera has a world-wide distribution and had many species with deficient descriptions, with some of the species never having been illustrated. In this study, a revision of the recognized species in this genus was made, including re-description of several species and the description of six new species* (X. etiopensis sp. n., X. amazonensis sp. n., X. grini sp. n., X. mendesi sp. n., X. alaidae sp. n., X. martini sp. n.). Oukuriella has species with larvae associated with the sponges or with logs, and this genus was collected frequently during the course of this study. As a result, six new species* in this genus are described for Brazil (O. matogrossensis sp. n., O. digita sp. n., O. minima sp. n., O. baiana sp. n., O. rimamplusa sp. n., O. pinhoi sp. n.). Since some of the described species had larvae associated with freshwater sponges, a phylogenetic analysis was carried out to test the hypothesis that species that inhabit sponges constitute a monophyletic group. The species whose larvae inhabit sponges were grouped together, but challenges still remain to better understand the relations among the species in this genus. Among these challenges are the lack of knowledge of all life- history stages, especially the immatures, and the difficulty of obtaining specimens and determining the association with sponges because rearing the immatures under laboratory conditions is difficult. / Os primeiros registros da associação entre Chironomidae e esponjas datam do inicio do século XX com Xenochironomus Kieffer e Demeijerea Kruseman na América do Norte. Desde então, poucas espécies desses gêneros foram descritas e somente nos últimos seis anos, espécies de outro gênero, Oukuriella Epler, foram relatadas como habitantes de esponjas de água doce, na região Neotropical. Neste trabalho, apresentamos uma revisão do conhecimento sobre Chironomidae em esponjas de água doce e adicionamos novas informações taxonômicas e ecológicas sobre esses insetos. No Brasil, até o momento, apenas dois gêneros foram observados em associação com esponjas de água doce, Xenochironomus e Oukuriella. O primeiro gênero tem distribuição mundial e apresentava diversas espécies com descrições deficientes, sendo que algumas delas nunca haviam sido ilustradas. Nesse estudo, foi feita uma revisão das espécies reconhecidas nesse gênero, incluindo redescrições de algumas delas e a descrição de seis espécies novas* (Xenochironomus etiopensis sp. n., X. amazonensis sp. n., X. grini sp. n., X. mendesi sp. n., X. alaidae sp. n. e X. martini sp. n.). Oukuriella apresenta espécies com larvas associadas a esponjas ou a troncos e, foi coletado com freqüência durante o desenvolvimento desse estudo. Como resultado, seis espécies novas* desse gênero foram descritas para o Brasil (Oukuriella matogrossensis sp. n., O. digita sp. n., O. minima sp. n., O. baiana sp. n., O. rimamplusa sp. n., O. pinhoi sp. n.). Como algumas das espécies descritas apresentaram larvas associadas a esponjas de água doce, foi realizada uma análise filogenética para testar a hipótese que espécies que habitam esponjas comporiam um grupo monofilético. As espécies cujas larvas habitam esponjas foram agrupadas, entretanto, permanecem ainda vários desafios para compreendermos melhor as relações entre as espécies desse gênero. Entre esses desafios, podemos citar a falta de conhecimento sobre todos os estágios de vida, em especial dos imaturos, e a dificuldade de obtenção dos espécimes e de determinar a associação com esponjas, uma vez que a criação desses imaturos em condições de laboratório é difícil.

Eutrophication is a global problem affecting many inland and estuarine waters. Many wetlands on the Swan Coast Plain, in Western Australia, have undergone increasing nutrient enrichment since European settlement of the region in the 1850’s. Problems such as algal blooms and nuisance swarms of non-biting midges (Diptera; Chironomidae) are the consequence of nutrient enrichment in many of these wetlands. The restoration of these degraded wetlands, especially with respect to reducing nutrient enrichment, requires a range of comprehensive and effective techniques including catchment management, diversion or treatment of surface inputs and treatment of enriched sediments. Nitrogen and phosphorus, especially phosphorus, are not the only factors controlling algal biomass in water bodies, but they are the only elements that can be removed efficiently and economically. Internal P cycling from wetland sediments can initiate and sustain eutrophication and related algal blooms and nuisance midge problems even after external sources are diverted or reduced. The aim of this study was to identify an effective material to reduce sediment phosphorus release and thereby the phosphorus concentration of the water column. It was also important to determine the impact of the selected amendment material on phytoplankton and larval midge (chironomid) communities. A range of experiments at increasing scales, from bench-top, to microcosm to outdoor mesocosm experiments were designed to test three hypotheses: 1) Materials which have a high P sorption capacity, over a wide range of P solution concentrations, and low P release rate, are potentially suitable agents to reduce P in wetlands with enriched sediments by inactivating sediment P; 2) A reduction in the abundance of cyanobacteria caused by increasing the N:P ratio of an aquatic ecosystem results in a reduction in the density of nuisance species of Chironomidae. 3) Successful amendment of enriched sediments reduces P in the water column thereby reducing the total phytoplankton biomass and the related density of nuisance species of Chironomidae. The adsorption and desorption experiments were carried out under a range of pH values and P concentrations, with a number of materials including fly ash, red mud, precipitated calcium carbonate, crushed limestone and lime to determine the maximum adsorption capacity and affinity of these materials. A rang of P concentrations (0-1000 µg/L) simulated the P concentration of the water column in a range of wetlands of differing trophic status. Poor fits to the Langmuir equation occurred with both red mud and fly ash due to their high P content. A good fit occurred with lime, with a high P removal rate (90%-96%) over the same range. Fly ash and red mud were eliminated from further investigation due to the possibility that they might release phosphorus rather than absorb when P concentrations in surrounding environment were less than 300 µg/L or 200 µg/L respectively (concentrations which can occur in eutrophic systems). Among the three lime-based, redox-insensitive materials tested in the second mesocosm experiments, precipitated calcium carbonate (PCC) possessed the highest maximum adsorption capacity and lowest desorption rate under a range of pH values (6.2, 7.2 and 10) and P concentrations (0-12 000 µg/L), followed by crushed limestone and lime. The different maximum absorption capacities of the three materials appears to be mainly attributed to their particle size (surface area). Lime was chosen as the amendment material for further investigation because it was the only one of the three available in sufficient quantities within the timeframe of this study. Microcosm experiments showed that lime was effective in reducing sediment P release from intact sediment cores, and the ratio of TN:TP in the treatment cores increased over time compared to the control cores (in which TN: TP decreased slightly). In the first mesocosm experiment a significantly higher density of larval midges was found in the treatments than in the controls. The treatments were aimed to increase N:P ratio in the systems to reduce cyanobacteria and, subsequently, larval midge densities. However even though cyanobacteria were eliminated from the treatments, the nitrogen addition appeared to result in higher phytoplankton biomass overall, which fuelled an increase in larval midge densities. In the second mesocosm experiment, the addition of lime to enriched sediments resulted in a reduction in P in the water column. This reduction was accompanied by a reduction in total phytoplankton biomass, the absence of cyanobacteria, and a less abundant and more species - diverse chironomid fauna in the treatment mesocosms. Sediment P fractionation undertaken for both the microcosm and mesocosm experiments showed that most of the phosphorus adsorbed by lime was in the labile fraction (NH3Cl extractable P and NaOH extractable P). Phosphorus in the HCl extractable fraction was also found to be higher in the treatments due to the presence of inert mineral P in the lime than the formation of new hydroxyapatite from adsorbed P. The two mesocosm experiments suggested that larval midges were non-selective feeders, responding to total phytoplankton biomass, rather than the presence of cyanobacteria. Dissolved oxygen and predation also influenced larval midge densities. In summary, although lime appeared to be a useful material for reducing P release from enriched sediments under controlled laboratory conditions, the effect under field conditions was not as definitive. Further work is required to more fully determine the conditions under which sediment remediation may be used as a means of controlling sediment P release and associated high densities of larval chironomids.

Thesis (Ph.D.)--Murdoch University, 2004. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves167-191.

Made available in DSpace on 2016-06-02T19:31:40Z (GMT). No. of bitstreams: 1 1763.pdf: 1155384 bytes, checksum: f68f138114f405bcba96753f3a709124 (MD5) Previous issue date: 2005-04-28 / In this study is analyzed the phytophilic Chironomidae assemblages of Eichhornia azurea (Swartz) Kunth in two ox-bow lakes (Diogo Lake and Óleo Lake) of the Mogi Guaçu s flood plain (Estação Ecológica de Jataí, Luíz Antônio, SP, Brazil). The colletion of E. azurea in both lakes were done during two seasons (rain season Nov./2002, Jan./2003, Mar./2003; dry season May/2003, Jul/2003, Oct/2003). From each lake 5 samples were randomly taken (3 were divided into 3 modules and separated the roots from the leafs and 2 were designated to estimate the adults emergency). However the richness and the numeric density were almost the same, the Chironomidae assemblage in the two lakes presented different faunistic arrangements (Psc < 60%), where the tribe Chironomini contributed with more than 20% of the fauna in both lakes. In Diogo Lake, Stenochironomus sp. was the dominant taxon as long as Goeldichironomus spp.> Polypedilum (Asheum) sp. > Beardius sp. were the most abundant taxa in Óleo Lake. These differences exhibited on the macroinvertebrates distribution among the modules and between the macrophyte parts. Diogo Lake had the fauna almost equally distributed on the modules and parts while in Óleo Lake there was a concentration of larvae on the roots and numerical distribution following the age s vegetable gradient. There wasn t observed direct influence of the river s hydrologic cycle on the macroinvertebrates dynamic however it were more numerous during the dry season (Diogo Lake); Óleo Lake presented no differences between the dry and the rain season. The adults (Chironomidae) presented different season pattern in the two lakes. In Óleo Lake, Tanytarsini and Chironomini concentrated its emergency during the rain season; in Diogo Lake just Tanytarsini showed higher emergency in the rain season. The observed differences between the macroinvertebrate assemblages are probably related with the macrophytes density and the morfometric characteristics of these two ox-bow lakes. / No presente estudo, são analisados os povoamentos de macroinvertebrados da fitofauna de Eichhornia azurea (Swartz) Kunth em duas lagoas (L. Diogo e L. Óleo) da planície de inundação do Mogi-Guaçu (Estação Ecológica de Jataí, Luíz Antônio, SP, Brasil). As coletas de E. azurea nas duas lagoas foram realizadas em dois períodos (chuvoso nov./2002, jan./2003, mar./2003; de estiagem mai./2003, jul./2003, out./2003). Em cada lagoa foram retiradas cinco unidades amostrais (3 divididas em módulos e separadas em folhas e raízes e 2 reservadas para estimativa da emergência de adultos). Embora com riqueza de táxons e densidades numéricas semelhantes, os comunidades nas duas lagoas apresentaram arranjos faunísticos diferenciados (PSc< 60%), sendo que a tribo Chironomini contribuiu com mais de 20% dos exemplares nas duas lagoas, porém com Stenochironomus sp. dominantes na L. Diogo e Goeldichironomus spp.> Polypedilum (Asheum) sp. > Beardius sp. na L. Óleo. Estas diferenças também se manifestaram na distribuição das larvas nos módulos e partes do vegetal. Enquanto que na L. Diogo a fauna se distribuiu igualmente nas partes e módulos, na L. Óleo houve maior concentração de larvas nas raízes e distribuição segundo um gradiente de idade do vegetal. Não se observou influência direta do ciclo hidrológico do rio na dinâmica das larvas embora mais numerosas na estiagem na L. Diogo; na L. Óleo a distribuição nas períodos climáticos foi semelhante. Os adultos (Chironomidae) apresentaram padrão sazonal diverso nas duas lagoas: na L. Óleo, os resultados indicaram que Tanytarsini e Chironomini emergiram em maior número no período chuvoso, diferente da L. Diogo onde apenas Tanytarsini mostraram maior emergência na chuva. Possivelmente as diferenças observadas nos dois povoamentos estejam relacionadas com as características morfométricas das lagoas e com a densidade vegetal.

The City of Denton, located in a semi-arid region of Texas, has over 200 manmade ponds within its city limits. Many of these ponds, located in densely populated areas, are engineered to control storm water runoff. There is a general lack of recognition of the value these waters contribute to regional biodiversity and as greenspaces. This study, conducted in Denton, is monitoring habitat variables and macroinvertebrate diversity in a series of ponds selected to represent a gradient of urban influences. The objective of this study is to identify the variables associated with the highest diversity. Using drone imagery and a meter square box sampler, the quantitative approach allowed for delineation of three habitat types and area. The macroinvertebrates where identified to the genus level which allowed for higher resolution and resulted in stronger comparisons of the communities and conditions of the ponds. Taxa richness was positively correlated to pond size and trees along shoreline and negatively associated with average depth. Overall, submerged vegetation supported highest diversity and abundance, especially genera of Chironomidae (Diptera). Conductivity was associated with urban influences and the most urban influenced pond had the lowest taxa richness, but also reduced habitat area. Results of this study conclude that these stormwater ponds benefit to the ecology of the city and provide beautiful, green spaces. If managed correctly, these systems can be incorporated into sustainable development in the future of the City of Denton.