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Barbara Meyer - One of the best experts on this subject based on the ideXlab platform.
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peridinium euryceps sp nov peridiniales dinophyceae a cryophilic dinoflagellate from lake erken sweden
Phycologia, 1998Co-Authors: Karin Rengefors, Barbara MeyerAbstract:Abstract A new phototrophic species of freshwater dinoflagellates, Peridinium euryceps sp. nov., is described from Lake Erken, Sweden. It is a large and extremely flattened dinoflagellate with a characteristic shape and a tabulation that differs from known species of the same genus. Peridinium euryceps appears during winter underneath the ice, encysts at ice melt, and then remains dormant as cysts during summer. This new species has morphological and ecological similarities with Peridinium baicalense, a species endemic to Lake Baikal, Russia. The Autoecology of P. euryceps is discussed, as well as the ecology of cryophilic and cold-stenothermic dinoflagellates in general. It is argued that these species have special adaptations for survival underneath the ice, such as a flattened shape and mixotrophic feeding.
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peridinium euryceps sp nov peridiniales dinophyceae a cryophilic dinoflagellate from lake erken sweden
Phycologia, 1998Co-Authors: Karin Rengefors, Barbara MeyerAbstract:Abstract A new phototrophic species of freshwater dinoflagellates, Peridinium euryceps sp. nov., is described from Lake Erken, Sweden. It is a large and extremely flattened dinoflagellate with a characteristic shape and a tabulation that differs from known species of the same genus. Peridinium euryceps appears during winter underneath the ice, encysts at ice melt, and then remains dormant as cysts during summer. This new species has morphological and ecological similarities with Peridinium baicalense, a species endemic to Lake Baikal, Russia. The Autoecology of P. euryceps is discussed, as well as the ecology of cryophilic and cold-stenothermic dinoflagellates in general. It is argued that these species have special adaptations for survival underneath the ice, such as a flattened shape and mixotrophic feeding.
Karin Rengefors - One of the best experts on this subject based on the ideXlab platform.
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peridinium euryceps sp nov peridiniales dinophyceae a cryophilic dinoflagellate from lake erken sweden
Phycologia, 1998Co-Authors: Karin Rengefors, Barbara MeyerAbstract:Abstract A new phototrophic species of freshwater dinoflagellates, Peridinium euryceps sp. nov., is described from Lake Erken, Sweden. It is a large and extremely flattened dinoflagellate with a characteristic shape and a tabulation that differs from known species of the same genus. Peridinium euryceps appears during winter underneath the ice, encysts at ice melt, and then remains dormant as cysts during summer. This new species has morphological and ecological similarities with Peridinium baicalense, a species endemic to Lake Baikal, Russia. The Autoecology of P. euryceps is discussed, as well as the ecology of cryophilic and cold-stenothermic dinoflagellates in general. It is argued that these species have special adaptations for survival underneath the ice, such as a flattened shape and mixotrophic feeding.
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peridinium euryceps sp nov peridiniales dinophyceae a cryophilic dinoflagellate from lake erken sweden
Phycologia, 1998Co-Authors: Karin Rengefors, Barbara MeyerAbstract:Abstract A new phototrophic species of freshwater dinoflagellates, Peridinium euryceps sp. nov., is described from Lake Erken, Sweden. It is a large and extremely flattened dinoflagellate with a characteristic shape and a tabulation that differs from known species of the same genus. Peridinium euryceps appears during winter underneath the ice, encysts at ice melt, and then remains dormant as cysts during summer. This new species has morphological and ecological similarities with Peridinium baicalense, a species endemic to Lake Baikal, Russia. The Autoecology of P. euryceps is discussed, as well as the ecology of cryophilic and cold-stenothermic dinoflagellates in general. It is argued that these species have special adaptations for survival underneath the ice, such as a flattened shape and mixotrophic feeding.
Gliozzi E - One of the best experts on this subject based on the ideXlab platform.
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Geochemical and Palaeoecological Analyses of Mid Pleistocene to Holocene Ostracod Assemblages from Valle di Castiglione (Italy): Palaeoenvironmental and Palaeoclimatic Assessment
'Elsevier BV', 2016Co-Authors: Anadón Pere, Gliozzi EAbstract:Sediments from Valle di Castiglione in Italy provide a reference sequence for Middle Pleistocene to Holocene palaeoclimate reconstruction of the Mediterranean area. Stable isotope and trace element signals from ostracod valves, as well as palaeoenvironmental analyses (Autoecology, community analysis and mutual ostracod temperature range), provided results that cannot be correlated with those derived from pollen and other proxy records. The lack of correlation is attributed to the peculiar geological, hydrogeological and hydrochemical setting of the Valle di Castiglione maar lake. The main trigger for the hydrochemical changes in the waterbody and, therefore, in the ostracod isotopic and trace element signatures, is likely the volcano-tectonic activity in the area. This illustrates how ostracod trace element and isotopic analyses are not the most appropriate tools for palaeoclimate reconstructions from lakes with complex hydrological features, such as some crater lakes, and demonstrates the need for care in selecting lacustrine sequences for such studiesThis study (P. A.) received financial support from Project CGL2008-00594 (Plan Nacional, Ministerio de Ciencia e Innovación, Spain).Peer Reviewe
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Geochemical and palaeoecological analyses on Mid Pleistocene to Holocene ostracod assemblages from Valle di Castiglione (Italy): palaeoenvironmental and palaeoclimatic assessment.
Elsevier Science BV, 2012Co-Authors: AnadÓn P., Gliozzi EAbstract:Sediments from Valle di Castiglione in Italy provide a reference sequence for Middle Pleistocene to Holocene palaeoclimate reconstruction of the Mediterranean area. Stable isotope and trace element signals fromostracodvalves, aswell aspalaeoenvironmental analyses (Autoecology, community analysis and mutual ostracod temperature range), provided results that cannot be correlated with those derived from pollen and other proxy records. The lack of correlation is attributed to the peculiar geological, hydrogeological and hydrochemical setting of the Valle di Castiglione maar lake. The main trigger for the hydrochemical changes in thewaterbody and, therefore, in the ostracod isotopic and trace element signatures, is likely the volcanotectonic activity in the area. This illustrates how ostracod trace element and isotopic analyses are not the most appropriate tools for palaeoclimate reconstructions fromlakeswith complex hydrological features, such as some crater lakes, and demonstrates the need for care in selecting lacustrine sequences for such studies
Gilbert J.m. - One of the best experts on this subject based on the ideXlab platform.
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Autécologie du pin laricio de Corse en pays de la Loire : analyse des données; approche mono-factorielle :rapport intermediaire
HAL CCSD, 1994Co-Authors: Gilbert J.m., Chevalier R., Dumas Y.Abstract:To study the Autoecology of the Laricio pine from Corsica in the Loire region, 255 phytoecological and dentrometric readings were taken in 1992 and 1993. This report is a presentation of the mono-factorial approach of data analysis in order to characterize the environments sampled, analyzed one factor at a time as well as the populations sampled and to demonstrate the relationships (or lack of them) between the fertility index (dominating height at 30 years) and the different environmental factors taken one at a time.Afin d'édutier l'autécologie du pin laricio de Corse en pays de la Loire, 255 relevés phytoécologiques et dendrométriques ont été réalisés durant les années 1992 et 1993. Le présent rapport traite de l'approche mono-factorielle de l'analyse des données afin de caractériser les milieux échantillonnés, analysés facteur par facteur ainsi que les peuplements échantiollonnés, et de mettre en évidence les relations (ou l'absence de relations) entre un indice de fertilité (hauteur dominante à 30 ans) et les différents facteurs du milieu pris individuellement
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Etude écologique du pin laricio en Pays de la Loire : préétude de la variabilité écologique de la région des Pays de la Loire
1993Co-Authors: Gilbert J.m., Bergevin G.Abstract:The goal of this survey on the ecological variability in the Loire region is to facilitate the use of dendrometric and ecological readings taken in 1992 by the CEMAGREF and the INRA in order to understand better the Autoecology of the Laricio pine from Corsica. Information relative to the relief, the hydrography, the climate, the geology and the pedology is also presented. / Cette étude de la variabilité écologique de la région des Pays de la Loire est destinée à faciliter l'exploitation des relevés dendrométriques et écologiques réalisés en 1992 par le CEMAGREF et l'INRA en vue de mieux cerner l'autécologie du pin Laricio de Corse. On y présente des informations relatives au relief, à l'hydrographie, au climat, à la géologie et à la pédologie
Hill Jennifer - One of the best experts on this subject based on the ideXlab platform.
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Chronosequences of ant nest mounds from glacier forelands of Jostedalsbreen, southern Norway: Insights into the distribution, succession and geo-ecology of red wood ants (Formica lugubris and F. aquilonia)
'SAGE Publications', 2018Co-Authors: Hill Jennifer, Vater, Amber E, Geary, Andrew P, Matthews, John AAbstract:Red wood ant nest mounds were investigated on terrain deglaciated since the mid-eighteenth century at three outlet glaciers of the Jostedalsbreen ice cap in southern Norway. Chronosequence methodology was combined with a geo-ecological approach in the context of autecology. Size and composition of 168 mounds, most of which belonged to Formica lugubris, were related to terrain age, vegetation characteristics and physical habitat types using non-metric multidimensional scaling (NMDS) linked to segmented bubble plots and inferential statistical techniques. Substantive insights include: (1) colonisation occurs 50–80 years after deglaciation; (2) mounds up to 100 cm high occupy the glacier forelands with a density of 2.5-4.6 mounds/hectare; (3) the positive correlation between mound size and terrain age is weakened by the presence of numerous small mounds attributed to the expansion of polydomous colonies by budding; (4) although mounds are composed mostly of plant remains (litter), they contain up to 17 % mineral material (mostly gravel) on relatively young terrain; (5) mound size and composition are related to the number of trees (Betula pubescens) occurring within 5 m of each mound, which reflects the availability of biological resources for mound thatch and ant food, the latter being primarily honeydew from aphids; (6) where aphids are present on trees, the mounds tend to be relatively large, reflecting the presence of ant-aphid mutualism; (7) mounds are larger on moraines and till plains than on outwash deposits, probably reflecting the enhancement of tree growth due to greater moisture availability and soil fertility in the former habitat types; (8) a strong southerly preferred aspect in mound orientation indicates the importance of direct solar radiation in maintaining internal mound temperatures; and (9) glacier-foreland landscapes are not simply time-dependent chronosequences reflecting succession but are the product of spatio-temporal dynamics involving biotic and abiotic interactions, which we summarize in a conceptual geo-ecological model. The main methodological implications are that chronosequences can be used to investigate the autecology of keystone species using a geo-ecological approach and multivariate analysis
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Chronosequences of ant nest mounds from glacier forelands of Jostedalsbreen, southern Norway: Insights into the distribution, succession and geo-ecology of red wood ants (Formica lugubris and F. aquilonia)
'SAGE Publications', 2018Co-Authors: Hill Jennifer, Vater Amber, Geary Andrew, Matthews JohnAbstract:© 2018, The Author(s) 2018. Red wood ant nest mounds were investigated on terrain deglaciated since the mid-18th century at three outlet glaciers of the Jostedalsbreen ice cap in southern Norway. Chronosequence methodology was combined with a geo-ecological approach in the context of autecology. Size and composition of 168 mounds, most of which belonged to Formica lugubris, were related to terrain age, vegetation characteristics and physical habitat types using non-metric multidimensional scaling (NMDS) linked to segmented bubble plots and inferential statistical techniques. Substantive insights include (1) colonisation occurs 50–80 years after deglaciation; (2) mounds up to 100 cm high occupy the glacier forelands with a density of 2.5–4.6 mounds/hectare; (3) the positive correlation between mound size and terrain age is weakened by the presence of numerous small mounds attributed to the expansion of polydomous colonies by budding; (4) although mounds are mostly composed of plant remains (litter), they contain up to 17% mineral material (mostly gravel) on relatively young terrain; (5) mound size and composition are related to the number of trees (Betula pubescens) occurring within 5 m of each mound, which reflects the availability of biological resources for mound thatch and ant food, the latter being primarily honeydew from aphids; (6) where aphids are present on trees, the mounds tend to be relatively large, reflecting the presence of ant–aphid mutualism; (7) mounds are larger on moraines and till plains than on outwash deposits, probably reflecting the enhancement of tree growth because of greater moisture availability and soil fertility in the former habitat types; (8) a strong southerly preferred aspect in mound orientation indicates the importance of direct solar radiation in maintaining internal mound temperatures and (9) glacier-foreland landscapes are not simply time-dependent chronosequences reflecting succession but the product of spatio-temporal dynamics involving biotic and abiotic interactions, which we summarise in a conceptual geo-ecological model. The main methodological implications are that chronosequences can be used to investigate the autecology of keystone species using a geo-ecological approach and multivariate analysis
