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‣ Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda)

Escalante,Patricio De los Ríos
Fonte: Fundação Zoobotânica do Rio Grande do Sul Publicador: Fundação Zoobotânica do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 Português
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Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902), which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S) and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. gracilipes collected in Riñihue lakes, with a third population of B. gracilipes collected in shallow ponds in Salar de Surire. Titicaca and Riñihue lakes are stable environments, whereas Salar de Surire is an extreme environment. These ponds present an extreme environment due to high exposure to solar radiation and high salinity levels. The results of the study revealed differences among the three populations. These results agree well with systematic descriptions in the literature on differences between the populations of Titicaca and Riñihue lakes, and population of Salar de Surire differs slightly from the other two populations. It is probable that the differences between the population of Salar de Surire and the other two populations result from the extreme environment in Salar de Surire. High exposure to solar radiation...

‣ Potential heterogeneity in crustacean zooplankton assemblages in southern chilean saline lakes

De los Rios-Escalante,P; Gajardo,G.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2010 Português
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The Chilean saline lakes are distributed mainly in the Atacama desert in northern Chile and the southern Patagonian plains. The scarce studies are restricted mainly to northern Chilean saline lakes, and these revealed that the main component in these ecosystems are the halophylic copepod Boeckella poopoensis Marsh 1906, or the brine shrimp Artemia franciscana (Kellog, 1906), and both species do not coexist. The present study consisted of field observations in zooplankton assemblages in southern Chilean saline lakes (51-53 ºS). These first observations revealed three different patterns, one saline lake only with A. persimilis (Piccinelli and Prosdocimi, 1968), a second lake only with B. poopensis, and a third lake with A. persimilis, B. poopoensis and unidentified harpacticoid copepod. These results are different in comparison with the observations in the literature that described the non-coexistence between B. poopoensis with brine shrimps. Ecological and biogeographical topics were discussed.

‣ Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

De los Ríos-Escalante,Patricio; Quinán,Esteban; Acevedo,Patricio
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2014 Português
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The Chilean Patagonia has numerous kinds of inland water ecosystems such as lakes, ponds, wetlands and rivers that have been poorly studied due to access difficulties. This study was carried out in Aysen region, in southern Chile, and it included different kinds of water bodies such as rivers, streams, ponds, lagoons and lakes distributed along an altitudinal gradient at 46° S. It was found a low species number, essentially cladocerans, copepods and amphipods. A null model was applied in order to determine the existence of regulator factors of species associations, and the results revealed that they are not random. The patterns would be influenced by geographical and limnological characteristics of the studied sites. Our results would agree with regional studies on habitat heterogeneity such as in Torres del Paine National Park and other zones in Tierra del Fuego island.

‣ Species assemblages of zooplanktonic crustaceans in mountain shallow ponds of Chile (Parque Cañi)

Ríos,Patricio De los; Roa,Guido
Fonte: Sociedade Brasileira de Zoologia Publicador: Sociedade Brasileira de Zoologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2010 Português
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Even though the Chilean lakes are characterized by their oligotrophy, a transition from oligotrophy to mesotrophy, due human intervention, has been reported in some lakes. Nevertheless, there are still some pristine and unpolluted small lakes and ponds in mountain zones, free of human intervention and surrounded by native forests. Nine unpolluted, oligotrophic and pristine water bodies located in Cañi Park, a mountain zone with altitudes between 1000 to 1500 m a.s.l and forests where Nothofagus dombeyi, N. pumilio and Araucaria araucana predominate, were studied. For each sampled lake, zooplankton was collected and environmental parameters were obtained (conductivity, total dissolved solids, and chlorophyll concentration). A null model of species co-occurrence was applied to determine randomness in species associations. All sites revealed low species richness (< 6); the calanoid copepod Boeckella gracilis Daday, 1902 was present in all sites. The results of the null model indicated randomness or absence of regulatory factors in species associations. Only few species occur in practically all localities. Also, a significant inverse association between chlorophyll concentration with percentage of calanoid copepods and a weak direct association between chlorophyll concentration and percentages of cladocerans were found.

‣ Mycosporine-like amino acids in planktonic organisms living under different UV exposure conditions in Patagonian lakes

TARTAROTTI, BARBARA; BAFFICO, GUSTAVO; TEMPORETTI, PEDRO; ZAGARESE, HORACIO E.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /07/2004 Português
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Mycosporine-like amino acids (MAAs) were studied in zooplankton from 13 Argentinian lakes covering a broad range in altitude, maximum depth and physico-chemical properties of the water. Four to nine different MAAs (predominantly porphyra-334 and shinorine) were found in the copepods Boeckella gibbosa, B. gracilipes, B. meteoris and Parabroteas sarsi, and in the ciliate Stentor amethystinus, while MAAs were undetectable in the cladoceran Daphnia middendorffiana. Among the different copepods, maximum MAA concentrations accounted for 0.25–1.31% of the dry weight, and contents were generally about three to seven times (up to 43 times) higher in the animals living in the clearest lakes compared to those occurring in low-UV systems. This variability in the content of MAAs was related to the lake altitude (r2 = 0.71), and the fraction of the water column to which 1% of the surface UV radiation at 320 nm penetrated (r2 = 0.57). Our data therefore underscore the role of MAAs as sunscreens to decrease the potential negative effects of solar radiation, but they also indicate that other environmental factors besides UV transparency play a role in determining MAA concentrations. One lake was selected to obtain additional information on the qualitative composition of MAAs in seston of <100 μm between two sampling sites and over a 2 month study period (austral summer). Six different MAAs were detected in the samples...

‣ Intersexuality in Boeckella triarticulata (Thomson, 1883) (Copepoda, Calanoida): a trap for unwary taxonomists

Bayly, I.; Shiel, R.
Fonte: Brill Academic Publishers Publicador: Brill Academic Publishers
Tipo: Artigo de Revista Científica
Publicado em //2008 Português
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Copepod systematists should be careful not to attribute taxonomic significance to teratological structures. Given that only a minute fraction of copepod populations is subjected to microscopic examination, and that several workers have encountered intersexual individuals, intersexuality is not an extremely rare phenomenon. The fifth legs of an intersexual Boeckella triarticulata, the second to be recorded in the literature, are figured and described in detail. The factor that induces intersexuality does not affect all four rami of the fifth pair of legs uniformly; one ramus may be fully male in character and another almost completely female. Karukinka fueguina Menu-Marque, 2003 is probably based on two intersexual individuals of Boeckella poppei (Mrázek, 1901).; Ian A.E. Bayly and Russell J. Shiel

‣ Identification of common cladocerans and calanoids in two South Australian reservoirs using DNA barcoding and morphological analysis: an integrative approach

Sharma, Pranay; Gutierrez, M. E.; Kobayashi, Tsuyoshi
Fonte: Brill Publicador: Brill
Tipo: Artigo de Revista Científica
Publicado em //2014 Português
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Valid identification of species of freshwater zooplankton is the first step to understand population structures, abundance, and diversity in the pelagic environment. While some Australian taxa can be easily identified morphologically, e.g., Calamoecia ampulla (Searle, 1911), most other species of freshwater micrometazoans are difficult to identify without specialised training, resulting in limited and even incorrect identification of the various taxa. The use of DNA barcodes, for species identification and discrimination, has added a new dimension to the traditional phenotypic approach and allows researchers to understand the patterns of genetic variability and to overcome taxonomic difficulties in the identification of the species from different life history stages. We used mitochondrial gene cytochrome c oxidase I (COI) to examine the species status of common planktonic microcrustaceans in two South Australian reservoirs. COI analyses indicated that the zooplankton specimens examined from the order Diplostraca and the class Maxillopoda, which were assigned binomial names a priori from the genera Bosmina, Boeckella, Chydorus, Calamoecia and Daphnia, possessed distinct COI sequences and nested cohesively within the genealogy, except for individuals of Ceriodaphnia cf. cornuta and a Ceriodaphnia species complex that formed 4 clusters. These clusters were not explicitly identified morphologically. The present study does improve and contribute to the understanding of the status of taxonomy and biogeography of micro-crustaceans in South Australia. This information is crucial for the application of these species in studies of local and regional environmental change over varying time scales. We recommend the integration of traditional morphology with DNA barcoding-based examination...

‣ A null model to study community structure of microcrustacean assemblages in northern Chilean shallow lakes

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The inland water bodies of northern Chile (18-27°S) are characterized by high salinity levels and impoverished species richness. This study presents field observations of species associations sampled from shallow water bodies in the Antofagasta region of northern Chile (23°S). A species presenceabsence matrix was created for calculating the Jaccard Index of community similarity and for testing null models of species associations, with the aim of determining whether species associations, are random or not. The results of the Jaccard Index calculations indicated the existence of defined groups, including three sites with Artemia franciscana, two sites with Boeckella poopoensis, and a sixth site only containing the ostracod Sarscypridopsis aculeata. The results of the null model analysis denoted the presence of regulating factors only in fixed-fixed simulation, that is the most robust in comparison to the other two simulations that denoted absence of regulator factors in species associations. The Jaccard indices and significant null model analysis agree with previous ecological descriptions of salinity as a determinant of species associations, whereas the non-significant results of the other two simulations could be due to the low number of species reported. The ecology and biogeography of these communities are also discussed. © 2011 Koninklijke Brill NV...

‣ Potential heterogeneity in crustacean zooplankton assemblages in southern chilean saline lakes

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
Relevância na Pesquisa
27.527188%
The Chilean saline lakes are distributed mainly in the Atacama desert in northern Chile and the southern Patagonian plains. The scarce studies are restricted mainly to northern Chilean saline lakes, and these revealed that the main component in these ecosystems are the halophylic copepod Boeckella poopoensis Marsh 1906, or the brine shrimp Artemia franciscana (Kellog, 1906), and both species do not coexist. The present study consisted of field observations in zooplankton assemblages in southern Chilean saline lakes (51-53 °S). These first observations revealed three different patterns, one saline lake only with A. persimilis (Piccinelli and Prosdocimi, 1968), a second lake only with B. poopensis, and a third lake with A. persimilis, B. poopoensis and unidentified harpacticoid copepod. These results are different in comparison with the observations in the literature that described the non-coexistence between B. poopoensis with brine shrimps. Ecological and biogeographical topics were discussed.

‣ Species co-occurrences based on a presence/absence null model for Copepoda and cladocerans in Patagonia and Tierra del Fuego lakes and ponds

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The zooplankton assemblages in southern Chilean Patagonia are characterized by calanoid dominance and low species number that is observable under oligotrophic status and wide conductivity values, whereas at mesotrophic status the daphnids are dominant with high species number, and finally at hyper-saline environments halophilic species such as Artemia persimilis and/or the calanoid Boeckella poopensis predominate. In the present study data of different lakes and ponds between 45-53° S were analyzed, with the aim to determine potential structures at different sites. For this purpose a null model based in guild structure was applied, considering each guild a different kind of water body (lake, small lake, permanent pond, ephemeral pond, and saline lake). The results revealed in two simulations that guild are structured. These results are similar with other descriptions on the basis of null models that revealed a random pattern of species associations for similar ecosystems due to many species repeated in all or practically all studied sites or similarities of ecological features. Ecological and biogeographical topics were discussed. © 2010 Versita Warsaw and Springer-Verlag Wien.

‣ An update of the distribution of Boeckella gracilis (Daday, 1902) (Crustacea, Copepoda) in the Araucania region (38°s), Chile, and a null model for understanding its species associations in its habitat

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The crustacean zooplankton of Chilean inland waters are characterized by abundant calanoid copepods, mainly from the genus Boeckella. The present study aims to update the distribution of Boeckella gracilis in the inland waters of the Araucania region (38-39°S) and to use null model analysis to understand the B. gracilis species associations. In the literature for Chile, this species is reported to be found in one northern lake and in three lakes of northern Patagonia. These findings are complemented by reports of this species for coastal and mountain ponds and mountain lakes of the Araucania region. These results agree with descriptions of this species for South American inland waters. The results of the null model analysis reveal factors regulating the species associations, whether comparing all the inhabitats or the guild structure, although some simulations show the opposite situation due to the presence of repeated species at many sites.; Los crustáceos zooplanctónicos en aguas continentales chilenas están caracterizados por la abundancia de copépodos calanoideos, principalmente del género Boeckella. El objetivo del presente trabajo es actualizar la distribución de esta especie en aguas continentales de la región de la Araucanía (38-39ºS)...

‣ Species assemblages of zooplanktonic crustaceans in mountain shallow ponds of Chile (Parque Cañi)

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
Relevância na Pesquisa
27.527188%
Even though the Chilean lakes are characterized by their oligotrophy, a transition from oligotrophy to mesotrophy, due human intervention, has been reported in some lakes. Nevertheless, there are still some pristine and unpolluted small lakes and ponds in mountain zones, free of human intervention and surrounded by native forests. Nine unpolluted, oligotrophic and pristine water bodies located in Cañi Park, a mountain zone with altitudes between 1000 to 1500 m a.s.l and forests where Nothofagus dombeyi, N. pumilio and Araucaria araucana predominate, were studied. For each sampled lake, zooplankton was collected and environmental parameters were obtained (conductivity, total dissolved solids, and chlorophyll concentration). A null model of species co-occurrence was applied to determine randomness in species associations. All sites revealed low species richness (< 6); the calanoid copepod Boeckella gracilis Daday, 1902 was present in all sites. The results of the null model indicated randomness or absence of regulatory factors in species associations. Only few species occur in practically all localities. Also, a significant inverse association between chlorophyll concentration with percentage of calanoid copepods and a weak direct association between chlorophyll concentration and percentages of cladocerans were found. © 2010 Sociedade Brasileira de Zoologia.

‣ Littoral crustaceans in mountain lakes of Huerquehue National Park (38°S, Araucania region, Chile)

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The water bodies studied herein are located in the Huerquehue National Park, a mountain zone with Nothofagus alpina, N. pumilio, N. dombeyi, and Araucaria araucana forests, at 700-1500 m a. s. l. There are numerous oligotrophic lakes, with characteristics similar to the deep Araucanian lakes. Many of these small lakes are difficult to reach, because the only routes leading there are long mountain paths. The sites studied in the present paper are five lakes: the first is located at the basis of the mountains (700 m a.s.l.) and is fed by a river that reaches it from series of three other lakes higher in the mountains (1300 m a.s.l.), which are connected by small streams. These four lakes are inhabited by fish populations. The fifth site is a small, shallow, and fishless pond located at one of the highest sites in the park (1400 m a.s.l). Samples were collected for analysis of chlorophyll concentrations and for littoral, aquatic crustaceans. All sites are oligotrophic, and show low crustacean species richness. In the four lakes with fishes, the crustacean littoral fauna was composed of Hyalella araucana (Amphipoda) only. In the fifth lake, the crustaceans collected were H. araucana, copepods (Boeckella gracilis and Mesocyclops longisetus)...

‣ Salinity effects on the abundance of Boeckella poopoensis (Copepoda, Calanoida) in saline ponds in the Atacama desert, northern Chile

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The calanoid copepod, Boeckella poopoensis Marsh, 1906 inhabits shallow saline ponds located in the Andes mountains in Argentina, Bolivia, Chile, and Peru, as well as in the plains of southern Argentina. The species is halophilic and can tolerate salinity levels of 1 to 90 ppt. This paper describes the relative abundance of the species in shallow mountain ponds in northern Chile from 23° to 27°S. A direct correlation was observed between salinity and the relative abundance of B. poopoensis (r2 = 0.4139), and between 45 and 90 ppt S the species was found to be dominant in zooplankton assemblages. Crustacean species richness at the sites studied showed a significant, inverse trend with salinity (r2 = 0.7329), and this trend became even stronger (r2 = 0.7681) when data previously published for the Bolivian Andean plateau were included. Ecological and biogeographical issues related with these results are discussed.

‣ Salinity level and occurrence of centropagid copepods (Crustacea, Copepoda, Calanoida) in shallow lakes in Andes Mountains and Patagonian plains, Chile

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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In Andes Mountains (14-27°S) and Patagonian plains (45-53°S) in Chile, there are numerous shallow saline and sub-saline lakes. These water bodies have important temporal and spatial variation of their salinity caused by mineral composition of their watershed or exposition to arid weather. In this study we compared the salinity level and the occurrence of centropagid copepods (Crustacea, Copepoda, Calanoida) in water bodies of both regions. In the Andes Mts the calanoids inhabit water bodies of salinity lower than 90 g l -1, and the representative species was Boeckella poopoensis (Marsh 1906), that occurs between 5.0 to 90.0 g l-1. In Patagonian plains, the copepods occur at salinity level between 0.1 to 16.0 g l-1, and within these values most frequent are B. popei (Mrázek 1901) and Parabroteas sarsi (Mrázek 1901). Both species can coexist with other calanoid species.

‣ Survival of two species of crustacean zooplankton under two chlorophyll concentrations and protection from or exposure to natural ultraviolet radiation

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The current, growing increase in penetration of ultraviolet (UV) radiation that has been reported over southern South America, would allegedly alter lacustrine ecosystems by bringing about photoprotective responses in biotic elements. The lacustrine zooplankton in the area is characterized by a predominance of calanoid copepods, mainly Boeckella spp., over cladocerans of the genus Daphnia, because the first group presumably has a higher tolerance towards exposure to ultraviolet radiation. An experiment was conducted involving exposure of two species of crustacean zooplankton to natural ultraviolet radiation, and providing protection from it by using two levels of chlorophyll a concentration. This study involved the non-pigmented species, Boeckella gracilipes (Daday, 1902) and Daphnia pulex (De Geer, 1778). The results showed that D. pulex exhibited a low mortality at high chlorophyll a levels, and concurrent protection against UV radiation. In contrast, B. gracilipes showed a significant, low mortality under exposure to UV radiation. © Koninklijke Brill NV, 2005.

‣ Survival of pigmented freshwater zooplankton, exposed to artificial ultraviolet radiation and two levels of dissolved organic carbon

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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The increase in penetration of ultraviolet radiation has been reported currently over southern South America. It would affect the photoprotective responses in biotic elements of freshwater ecosystems. An experiment was designed using pigmented adult individuals of the species Daphnia dadayana (Paggi 1999), Boeckella antiqua (Menu-Marque & Balseiro 2000), and Parabroteas sarsi (Mrázek 1901), characteristic for shallow fishless ponds from South American plains (located between 41 and 53°S latitude). The artificial ultraviolet radiation was involved in the experiment, with two levels of dissolved organic carbon (DOC), which would exert a protective effect against ultraviolet radiation. The results of this experiment showed that under conditions of low DOC concentrations, D. dadayana recorded a higher mortality, while under low DOC concentrations, B. antiqua and P. sarsi were not affected by ultraviolet radiation. Daphnids would be less tolerant to the exposure to ultraviolet radiation than pigmented calanoid copepods.

‣ A null model to explain zooplankton species associations in saline lakes of the south american altiplano (14-27 degrees S).

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
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La diversidad del zooplankton en lagos salinos poco profundos de Sudamérica es baja y su distribución depende altamente de la salinidad, la cual varía de moderada a alta. A salinidades menores a 90 g/l predomina el copépodo halofílico Boeckella poopoensis (Marsh, 1906), mientras que a salinidades superiores a ese nivel, el anostraco Artemia franciscana (Kellogg, 1912) es el componente exclusivo de los hábitats. Esto constituye sin embargo una información parcial. En una revisión de la literatura disponible para lagos salinos Andinos en Bolivia, Chile y Perú se confirma que la presencia y distribución de ambas especies está significativamente regulada por el nivel de la salinidad. Los resultados del modelo nulo de co-ocurrencia de especies indican que las asociaciones de especies no son aleatorias, y estos resultados están respaldados por el análisis de correlación, el cual indica una relación inversa significativa entre número de especies con salinidad, y hubo relaciones directas significativas entre número de especies con la superficie del hábitat. El bajo número de especies que es característico de estos hábitats y su dependencia con los cambios de salinidad efectuado por las condiciones climáticas provee un buen modelo de sistema de monitoreo de cambios climáticos.; Zooplankton diversity in shallow salt lakes of the Andean countries in South America is low and distribution is highly dependent on salinity...

‣ First observations on reproductive characteristics on Chilean Patagonian populations inland water Calanoids Copepods

Fonte: Universidad de Concepción, Facultad de Ciencias Naturales y Oceanográficas. Publicador: Universidad de Concepción, Facultad de Ciencias Naturales y Oceanográficas.
Tipo: Artículo de Revista
Português
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Los copépodos calanoideos son abundantes en los ensambles zooplanctónicos de aguas continentales de la Patagonia, y en este contexto, se analizaron parámetros de fertilidad en cuatro especies de calanoideos representativos de aguas continentales de la Patagonia (37°-52° S) con el objetivo de determinar los parámetros de fertilidad en poblaciones de copépodos representativas de la Patagonia chilena. Para este propósito se consideraron dos a cuatro poblaciones de las siguientes especies: Boeckella gracilipes, B. michaelseni, B. poppei, y Tumeodiaptomus diabolicus, se consideraron individuos hembras con huevos a las que se midió el largo total, número de huevos y la razón entre número de huevos con el largo total. Los resultados mostraron que a nivel de especies B. poppei fueron significativamente diferentes para las otras tres especies. A nivel de poblaciones, se encontraron diferencias a nivel de poblaciones en algunas especies. Los resultados que los parámetros reproductivos variaron en función de los parámetros ambientales variaron en función de las condiciones ambientales de las poblaciones y estaría asociado con las condiciones ecológicas tales como estructuras poblacionales y las propiedades de las comunidades zooplanctónicas.; The calanoids copepods are abundant in zooplankton assemblages in Patagonian inland waters...

‣ Distribución y diversidad de Cladóceros (Sididae, Daphniidae, Bosminidae y Chydoridae) en la región de la Araucanía (38º-39ºS)

Fonte: Universidade Católica de Temuco Publicador: Universidade Católica de Temuco
Tipo: Artículo de Revista
Português
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Los cuerpos de agua de Chile se caracterizan por la presencia de tramas tróficas sencillas (De los Ríos-Escalante, 2003) y un bajo número de especies zooplanctonicas, siendo dominante los copépodos calanoideos, específicamente los géneros Boeckella y Tumeodiaptomus, ocurriendo el proceso contrario con los Cladoceros, los cuales son especies dominantes en el hemisferio norte (Soto & Zúñiga, 1991; Gilloly & Dodson, 2000; Dodson et al 2009).