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Distribución latitudinal de foraminíferos bentónicos (Protozoa: Foraminiferida) a nivel de subórdenes y familias, en canales y fiordos patagónicos chilenos
Hromic,Tatiana;
Investigaciones marinas , 2006, DOI: 10.4067/S0717-71782006000100006
Abstract: the latitudinal distribution of benthic foraminifers is studied at the levels of suborder and family. 106 samples were collected on the continental shelf (50-300 m) between 43os and 55os in the area of channels and fjords, eastern south pacific, during cimar fiordos expeditions 2, 3, 7 and 8. the foraminifers (50,480 specimens) were classified in 5 suborders, 46 families and 228 species. the number of suborders, families, and the families by suborder do not depend on the latitudinal gradient. likewise, abundance at the suborder and family levels does not fluctuate with latitude. a major change was observed at 44os (baeza and memory channels), where the number and abundance of suborders and families, species richness, and diversity decreased drastically. the same occurred between 46o and 48o s (steffen and mitchell estuaries and escape channel). this may suggest that local events, such as oceanic currents, could be more important than latitude in controlling microfauna distribution patterns
DISTRIBUCIóN BATIMéTRICA DE FORAMINíFEROS BENTóNICOS (PROTOZOA: FORAMINIFERIDA) AL SUR DEL ESTRECHO DE MAGALLANES (52°-56°S), CHILE
Hromic,Tatiana;
Anales del Instituto de la Patagonia , 2009, DOI: 10.4067/S0718-686X2009000100003
Abstract: bathymetric distribution of benthic foraminifera from the southernmost part of the chilean chan-nels and fiords (52 - 56°s) was analyzed. thirty four samples were collected from the magallanes shelf, south of the magellan strait (35 - 650 m). during the cimar 3 fiord cruise (1998) organized by the comité oceanógrafico nacional (cona). 21.190 specimens were collected and classified into 169 spe-cies. only 8.3% of species had an abundance of more than 2% and 47 species were selected according to their abundance to verify their distribution. three associations are described: a) shallow water (0-150 m). in the upper layer (0-50 m) bucceua frigida, buliminella elegantissima and discorbis berthelothi were found. between 50m and 100 m, cibicides dispars, bucceua frigida and ammonia beccarii were abundant and, in the inner part, anguíogerina angulosa and ehrenbergina pupa were found. b) intermedíate water (150 - 350 m); uvigerina brunnensis, buíimina notovata and nonionoides grateíoupi were common between 150 - 200 m. the most abundant species between 200 and 250 m were nonionoides grateíoupi, buíimina notovata and oridorsaíis tener. anguíogerina angulosa, cassiduíina carinata and globocassidulina rossensis were found in the deepest water of this layer (250 y 300 m). c) deep water (>350 m). oridorsaíis tener and cibicides refulgens were the main species present and discanomalina vermiculata, cibicides refulgens and anguíogerina angulosa were also found. anguíogerina angulosa, anguíogerina carinata and cassiduíina laevigata were found in the deepest part of the magellan shelf (below 600 m).
ESTRUCTURA COMUNITARIA DEL TAXA FORAMINIFERIDA (PROTOZOA), SEGúN PROFUNDIDAD, EN EL FIORDO COMAU, CHILOé, CHILE
Hromic,Tatiana;
Anales del Instituto de la Patagonia , 2009, DOI: 10.4067/S0718-686X2009000100004
Abstract: assemblages of foraminifera were studied at two depths (surface sediment obtained from shallow water < 30 m and deep water >80m) in comau fjord, chibé, chile. from analyses of results by simper, anosim, mds, and cluster analyses, two distinct communities were described. in the shallow water sediments ammonia beccarü (87.6 %) and bucceua peruviana (4.48 %) are the species which contributed most to the similarity of the samples. from the deep water sediment, the main species contributing to the infernal similarity were: uvigerina bifurcata (24.8 %), buíimna notovata (21.8%), bulimina patagonica (14.42 %), nonionella auris (10.11%), globocassidulina minuta (7.37%), nonionoides grateloupi (3.94%), quinqueloculina seminula (3.44%), buccella frígida (3.13%) and bulimina marginata (2.93). all these species are well known in the chilean channels and fjords área. benthic foraminifera abundance, species richness, diversity and evenness percentage were almost twice as great in the deep water than the surface water. abundance of arenaceous foraminifera increased and porcelanceous foraminifera decreased, with water depth.
ESTRUCTURA COMUNITARIA DEL TAXA FORAMINIFERIDA (PROTOZOA), SEGúN PROFUNDIDAD, EN EL FIORDO COMAU, CHILOé, CHILE COMMUNITY STRUCTURE OF FORAMINIFERA (PROTOZOA) TAXA FROM TWO WATER DEPTHS (COMAU FJORD, CHILOé, CHILE)
Tatiana Hromic
Anales del Instituto de la Patagonia , 2009,
Abstract: La composición de las comunidades foraminiferológicas en sedimentos superficiales de aguas menores a 30 m y mayores a 80 m del fiordo Comau, golfo de Ancud, Chibé, Chile, aplicando SIMPER, ANOSIM, MDS y análisis de Cluster, muestran una alta diferencia y distinguen dos comunidades: una de aguas someras, en la cual las especies que más contribuyen a la similitud de las muestras son Ammonia beccarü (87,6 %) y BucceUa peruviana (4,48 %) y otra de aguas más profundas, en la cual, las especies que más contribuyen a su individualización son: Uvigerina bifurcata (24,8%), Buíimna notovata (21,8%), Bulimina patagónica (14,42%), Nonionella auris (10,11%), Globocassidulina minuta (7,37%), Nonio-noides grateloupi (3,94%), Quinqueloculina seminula (3,44%), BucceUa frígida (3,13%) y Bulimina marginata (2,93%). Todas ellas eran conocidas en el área de canales y fiordos patagónicos chilenos. Ambas comunidades evidencian también diferencias en relación con el número de especies, abundancia, diversidad y homogeneidad, parámetros que aumentan casi al doble en las aguas más profundas. La cantidad de foraminíferos con caparazón arenáceo tiende a aumentar hacia las profundidades mientras que los porcelanoides tienden a disminuir. Assemblages of foraminifera were studied at two depths (surface sediment obtained from shallow water < 30 m and deep water >80m) in Comau Fjord, Chibé, Chile. From analyses of results by SIMPER, ANOSIM, MDS, and Cluster Analyses, two distinct communities were described. In the shallow water sediments Ammonia beccarü (87.6 %) and BucceUa peruviana (4.48 %) are the species which contributed most to the similarity of the samples. From the deep water sediment, the main species contributing to the infernal similarity were: Uvigerina bifurcata (24.8 %), Buíimna notovata (21.8%), Bulimina patagonica (14.42 %), Nonionella auris (10.11%), Globocassidulina minuta (7.37%), Nonionoides grateloupi (3.94%), Quinqueloculina seminula (3.44%), Buccella frígida (3.13%) and Bulimina marginata (2.93). All these species are well known in the Chilean channels and fjords área. Benthic foraminifera abundance, species richness, diversity and evenness percentage were almost twice as great in the deep water than the surface water. Abundance of arenaceous foraminifera increased and porcelanceous foraminifera decreased, with water depth.
DISTRIBUCIóN BATIMéTRICA DE FORAMINíFEROS BENTóNICOS (PROTOZOA: FORAMINIFERIDA) AL SUR DEL ESTRECHO DE MAGALLANES (52°-56°S), CHILE BATHYMETRIC DISTRIBUTION OF BENTHIC FORAMINIFERA (PROTOZOA: FORAMINIFERIDA), SOUTHERN MAGELLAN STRAITS (52°-56°S), CHILE
Tatiana Hromic
Anales del Instituto de la Patagonia , 2009,
Abstract: Se analiza la distribución batimétrica de los foraminíferos bentónicos en el área de canales y fiordos, al sur del estrecho de Magallanes, (52-56°S), Chile. Para ello se estudiaron 34 muestras recolectadas en la zona de plataforma (35 - 650 m), durante la expedición CIMAR 3 FIORDOS (1998), organizada por el Comité Oceanógrafico Nacional (CONA). Se obtuvieron 21.190 ejemplares los que fueron clasificados en 169 especies; sólo el 8,3% de las especies alcanzaron una representación superior al 2%, por lo cual, se seleccionaron 47 especies, según su abundancia por tramo, para verificar su distribución. Se reconocieron tres asociaciones: a) de aguas someras (0-150 m); en la porción más superficial (50 m) dominaron Buccella frígida, Buliminella elegantissima y Discorbis berthelothi. Entre 50 y 100 m abundaron Cibicides dispars, Buccella frígida y Ammonia beccarü y en la parte más baja Angulogerina angulosa y Ehrenbergina pupa, b) de aguas intermedias (150 - 350 m); en el estrato más alto de este horizonte (150 - 200 m) dominaron Uvigerina brunnensis, Bulimina notovata y Nonionoides grateloupi. Entre 200 y 250 m se mantuvo la presencia de Nonionoides grateloupi y Bulimina notovata y se hizo presente Oridorsalis tener. Entre 250 y 300 m, se presentaron Angulogerina angulosa, Cassidulina carinata y Globocassidulina rossensis y finalmente, c) de aguas profundas (>350 m) en donde abundaron Oridorsalis tener y Cibicides refulgens, algo más profundamente aún se encontraron Discanomalina vermiculata, Cibicides refulgens y Angulogerina angulosa y finalmente, por debajo de los 600 m se encontraron Angulogerina angulosa, Angulogerina carinata y Cassidulina laevigata. Bathymetric distribution of benthic foraminifera from the southernmost part of the Chilean chan-nels and fiords (52 - 56°S) was analyzed. Thirty four samples were collected from the Magallanes shelf, south of the Magellan Strait (35 - 650 m). During the Cimar 3 Fiord cruise (1998) organized by the Comité Oceanógrafico Nacional (CONA). 21.190 specimens were collected and classified into 169 spe-cies. Only 8.3% of species had an abundance of more than 2% and 47 species were selected according to their abundance to verify their distribution. Three associations are described: a) shallow water (0-150 m). In the upper layer (0-50 m) BucceUa frigida, Buliminella elegantissima and Discorbis berthelothi were found. Between 50m and 100 m, Cibicides dispars, BucceUa frigida and Ammonia beccarii were abundant and, in the inner part, Anguíogerina angulosa and Ehrenbergina pupa were found. b) Intermedíate water (150 - 350
Distribución latitudinal de foraminíferos bentónicos (Protozoa: Foraminiferida) a nivel de subórdenes y familias, en canales y fiordos patagónicos chilenos Latitudinal distribution of suborder and family levels of benthic foraminifers (Protozoa: Foraminiferida), in Chilean Patagonian channels and fjords
Tatiana Hromic
Investigaciones Marinas , 2006,
Abstract: Se analizó la distribución de los foraminíferos bentónicos a nivel de suborden y familia entre los 43o y 55oS en la zona de canales y fiordos patagónicos. Se revisaron 106 muestras recolectadas en la plataforma continental (50-300 m), durante las expediciones Cimar Fiordos 2, 3, 7 y 8. Se recolectaron 50.480 ejemplares, que fueron clasificados en 5 subórdenes, 46 familias y 228 especies. Tanto el número de subórdenes como de familias, así como el número de familias por suborden, no mostraron variación de acuerdo al gradiente latitudinal. De igual modo ni el número de ejemplares por suborden ni por familia fluctuó en función del gradiente latitudinal. Las mayores variaciones se observaron en la latitud 44oS (canales Baeza y Memory) y entre 46o y 48oS (esteros Steffen y Mitchell, y canal Escape), con disminución drástica de todos los parámetros analizados (número de subórdenes, abundancia total, diversidad). Ello sugiere que procesos locales, como el flujo de masas de agua podría estar controlando la distribución The latitudinal distribution of benthic foraminifers is studied at the levels of suborder and family. 106 samples were collected on the continental shelf (50-300 m) between 43oS and 55oS in the area of channels and fjords, eastern South Pacific, during Cimar Fiordos Expeditions 2, 3, 7 and 8. The foraminifers (50,480 specimens) were classified in 5 suborders, 46 families and 228 species. The number of suborders, families, and the families by suborder do not depend on the latitudinal gradient. Likewise, abundance at the suborder and family levels does not fluctuate with latitude. A major change was observed at 44oS (Baeza and Memory channels), where the number and abundance of suborders and families, species richness, and diversity decreased drastically. The same occurred between 46o and 48o S (Steffen and Mitchell estuaries and Escape channel). This may suggest that local events, such as oceanic currents, could be more important than latitude in controlling microfauna distribution patterns
Foraminíferos Bentónicos recientes del Estrecho de Magallanes, y canales australes chilenos CIMAR 3 FIORDOS (52° - 56°S)
Hromic M,Tatiana;
Anales del Instituto de la Patagonia , 2011, DOI: 10.4067/S0718-686X2011000200002
Abstract: results of taxonomic analysis and comunity structure of benthic foraminifers collected during ci-mar 3 fiordos expedition (1997, 1st. stage), comité oceanográfico nacional (cona) were presented. a total of 33 samples of marine sediment from estrecho de magallanes and southernmost channels and fjords, chile (52° - 56° s) were analyzed. abundance, density, species richness, diversity, equity and multivariate analysis, hierarchical cluster analysis and mds o foraminiferal data resulted in the recognition of fve biofacies without a clear geographic distribution patterns. it was studied 22.016 specimens (428 specimens/gram) and classiffeds in 6 suborders, 79 genera and 170 species. the suborder rotaliina was the most abundant (44 % species and 93,3% specimens). dominant species are cibicides dispars (18,8%), discanomalina vermiculata (10%), angulogerina angulosa 9%) and buccella frígida (8%) and the most distributed nonionoides grateloupi (50% of stations), angulogerina angulosa (47%), cassidulinoides parvus (44%) and quinqueloculina seminula (42%). similarity percentage analysis showed 10 taxa definiing groups.
Foraminíferos Bentónicos recolectados durante la expedición CIMAR 14 Fiordos, Patagonia Chilena
Hromic M,Tatiana;
Anales del Instituto de la Patagonia , 2011, DOI: 10.4067/S0718-686X2011000100007
Abstract: in 2008, the national oceanographic committee (cona) of chile, organised the cimar14 fiords expedition to the chilean channels and fiords, located between 47° and 50° s. one of the groups studied was the benthic foraminifera. information on the community structure of the group is reported and results are compared with those obtained in previous cruises. the material studied comes from samples of superficial sea sediments, collected at 27 stations with a box corer. the samples were washed, dried and the microfauna extracted under a binocular microscope. subsequently the species were identified and counted, assigning univariate and multivariate statistical indexes. overall, 2,569 shells of benthic foraminifera were obtained belonging to the following suborders: rotaliina (60,8 %; 39 species); textulariina (26,9 %; 19 species), miliolina (6,4 % ; 11 species), lagenina (5,77%), involutinina (1,97%), spirillinina (0,69%) and robertinina (0,42%) with one species each. uvigerina bifurcata (13, 6 %), recurvoides scitullum (8,7 %), melonis affinis (6,8%), cassidulinoides parkerianus (5,2%), recurvoides contortus (5,2 %), globobulimina notovata and oridorsalis tener (4,3 %) were the most abundant. the species with a wider geographic distribution were g. notovata, recurvoides contortus and u. bifurcata. a conglomerate analysis allowed splitting the stations into four groups: 1) without defined geographic distribution, 2) coastal area, 3) southern area and 4) northern area. compared to the results obtained in previous surveys, there was an increase in the number of sand-foraminifera, and some species- mostly marine- were replaced by more euryhaline ones.
Foraminíferos Bentónicos recientes del Estrecho de Magallanes, y canales australes chilenos CIMAR 3 FIORDOS (52° - 56°S) Recent Benthic Foraminifera from Magellan Strait and Southernmost chilean channels, CIMAR 3 FIORDOS (52° - 56° S)
Tatiana Hromic M
Anales del Instituto de la Patagonia , 2011,
Abstract: Se dan a conocer los resultados del análisis taxonómico y estructura comunitaria de los foraminíferos bentónicos recolectados durante la expedición oceanográfica CIMAR 3 FIORDOS (1997, 1a Etapa) organizada por el Comité Oceanográfico Nacional (CONA). Se analizaron 33 muestras de sedimento marino superficial recolectadas con draga McIntyre, en canales y fiordos situados en y al sur del Estrecho de Magallanes (52° - 56° S), Chile. Se entrega abundancia, densidad, riqueza específica, diversidad y equidad. Además se incluye los resultados de los análisis multivariados de conglomerados y MDS. Se recolectó un total de 22.016 ejemplares (428 ejemplares /gramo), los que se clasificaron en 6 Subórdenes, 79 géneros y 170 especies. El suborden con mayor representación fue Rotaliina con 44% de las especies y 93% de los ejemplares. Las especies dominantes en el área fueron Cibicides dispars (18,8%) y Discanomalina vermiculata (10%) y Angulogerina angulosa 9%) y las más frecuentes: Nonionoides grateloupi (50% de las estaciones), Angulogerina angulosa (47%), Cassidulinoides parvus (44%), Quinqueloculina seminula (42%), Se reconocieron 5 biofacies, sin un claro patrón de distribución geográfica. Results of taxonomic analysis and comunity structure of benthic foraminifers collected during CI-MAR 3 FIORDOS expedition (1997, 1st. Stage), Comité Oceanográfico Nacional (CONA) were presented. A total of 33 samples of marine sediment from estrecho de Magallanes and southernmost channels and fjords, Chile (52° - 56° S) were analyzed. Abundance, density, species richness, diversity, equity and multivariate analysis, hierarchical cluster analysis and MDS o foraminiferal data resulted in the recognition of fve biofacies without a clear geographic distribution patterns. It was studied 22.016 specimens (428 specimens/gram) and classiffeds in 6 suborders, 79 genera and 170 species. The suborder Rotaliina was the most abundant (44 % species and 93,3% specimens). Dominant species are Cibicides dispars (18,8%), Discanomalina vermiculata (10%), Angulogerina angulosa 9%) and Buccella frígida (8%) and the most distributed Nonionoides grateloupi (50% of stations), Angulogerina angulosa (47%), Cassidulinoides parvus (44%) and Quinqueloculina seminula (42%). Similarity percentage analysis showed 10 taxa definiing groups.
Foraminíferos Bentónicos recolectados durante la expedición CIMAR 14 Fiordos, Patagonia Chilena Benthic Foraminifera collected during the CIMAR 14 Fiords expedition, Chilean Patagonia
Tatiana Hromic M
Anales del Instituto de la Patagonia , 2011,
Abstract: Durante el a o 2008, el Comité Oceanográfico Nacional (CONA), Chile, organizó la expedición CIMAR 14 Fiordos, a la zona de canales y fiordos chilenos, comprendida entre los 47° y 50° S. Uno de los grupos estudiados fue el de los foraminíferos bentónicos. En el presente trabajo se entregan antecedentes de la estructura comunitaria del grupo y se comparan los resultados con los obtenidos en cruceros previos. El material estudiado proviene de muestras de sedimento marino superficial, obtenidas en 27 estaciones con un box corer. Las muestras fueron lavadas, secadas y la microfauna extraída bajo lupa binocular. Posteriormente se identificaron y contaron las especies, aplicándose índices estadísticos uni y multivariados. En total se obtuvieron 2.569 caparazones de foraminíferos bentónicos, pertenecientes a los subórdenes: Rotaliina (60,8 %; 39 especies); Textulariina (26,9 %; 19 especies), Miliolina (6,4 %; 11 especies), Lagenina (5,77%), Involutinina (1,97%), Spirillinina (0,69%) y Robertinina (0,42%) con una especie cada uno. Las especies más abundantes fueron Uvigerina bifurcata (13,6 %), Recurvoides scitullum (8,7 %), Melonis affinis (6,8%), Cassidulinoides parkerianus (5,2%), Recurvoides contortus (5,2 %), Globobulimina notovata y Oridorsalis tener (4,3 %). Las especies con una distribución geográfica más amplia fueron G. notovata, Recurvoides contortus y U. bifurcata. Un análisis de conglomerados permitió separar a las estaciones en 4 grupos: 1) sin situación geográfica definida, 2) área costera, 3) área sur y 4) área norte. En relación con los resultados obtenidos en campa as previas hubo un incremento en el número de foraminíferos arenáceos, y especies típicamente marinas fueron reemplazadas por otras más eurihalinas. In 2008, the National Oceanographic Committee (CONA) of Chile, organised the CIMAR14 Fiords Expedition to the Chilean channels and fiords, located between 47° and 50° S. One of the groups studied was the benthic foraminifera. Information on the community structure of the group is reported and results are compared with those obtained in previous cruises. The material studied comes from samples of superficial sea sediments, collected at 27 stations with a Box Corer. The samples were washed, dried and the microfauna extracted under a binocular microscope. Subsequently the species were identified and counted, assigning univariate and multivariate statistical indexes. Overall, 2,569 shells of benthic foraminifera were obtained belonging to the following suborders: Rotaliina (60,8 %; 39 species); Textulariina (26,9 %; 19 species), Miliolina (6
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