327 research outputs found
Clark and Doreen Wolfe
No full textPhotograph - Doreen Wolfe (nee Loxam) signing the register at her wedding to Clark Wolfe, Fort McMurray, Alberta. The marriage of the two RCMP officers was performed by Reverend Rathbon
The role of sea ice algae-produced carbon in Arctic and Antarctic food webs. Dependency of polar life on a threatened food source
No full textThe underside of sea ice in Polar Regions represents a natural habitat for heterotrophic
organisms, such as copepods and amphipods. This under-ice fauna plays a key role in
transferring carbon synthesized by sea ice-associated (sympagic) microalgae into
associated pelagic and benthic food webs of polar ecosystems. Animals at higher trophic
levels are adapted to feed on the under-ice fauna as well as on pelagic zooplankton and
nekton. Polar ecosystems thrive significantly on ice algae-produced carbon depending
on different periods of the year. Thus, the under-ice fauna and the associated pelagic
food web are largely affected by multi-scale climate changes accompanied by the
reduction of sea ice coverage and an increasing duration of the melt season. Until now,
however, the degree to which polar food webs depend on sea ice-derived carbon is
unclear.
The overall aim of this thesis is to quantify the transfer of ice algae-produced carbon
from the sea ice into the under-ice community and from there into pelagic food webs in
Arctic and Antarctic ecosystems, in order to improve our understanding of the potential
ecological consequences of a changing sea ice environment for marine food web
dynamics. Furthermore, spatial and seasonal differences in the utilization of ice algaeproduced
carbon within and between both hemispheres are investigated.
The sample collection in the central Arctic Ocean was carried out during the RV
‘Polarstern’ expedition ARK XXVII-3 (PS80, August-September 2012) within the
Amundsen and Nansen Basins. In the Southern Ocean, samples were collected during the
RV ‘Polarstern’ expeditions ANT XXIX-7 (PS81, August-October 2013) in the northern
Weddell Sea and ANT XXIX-9 (PS82, December 2013-March 2014) offshore from the
Filchner Ice Shelf.
Trophic interactions of important representatives of Arctic and Antarctic food webs are
studied using lipid fingerprinting, stable isotope analysis (SIA) of natural abundance
bulk carbon and nitrogen (BSIA), and compound-specific SIA (CSIA) of fatty acids (FAs).
From the distribution of algae-produced FAs in the consumers (= marker FAs), the
origin of carbon produced by diatoms versus dinoflagellates in key Arctic species
(Chapter I and II) and key Antarctic species (Chapters III-VI) is investigated. Stable
isotope mixing models are used to quantify the relative contribution of bulk carbon and
marker fatty acids derived from ice algae versus pelagic phytoplankton to the carbon
budget of the organisms. Additionally, the stomach contents of polar cod Boreogadus
saida (Chapter II) and Antarctic krill Euphausia superba (Chapter IV) are investigated
to provide information on the most recent diet composition and carbon sources
compared to the long-term trophic signal derived from FA proportions and stable
isotope compositions.
In the Arctic food web, a high contribution of ice algal carbon with up to 90% of the
carbon budget of species with a known strong sea ice association, such as the amphipods
Apherusa glacialis and Onisimus glacialis, is demonstrated. The results also suggest a
substantial ice algae-carbon assimilation by rather pelagic species, such as Calanus
copepods and the pelagic amphipod Themisto libellula during late Arctic summer, in
which sympagic carbon contributed up to 55% of the carbon budget of these species
(Chapter I). Furthermore, a high trophic dependency of polar cod on sea ice-associated
resources is shown (up to 95% ice algal carbon of body carbon), indicating their high
vulnerability in regards to alterations of the sympagic food web (Chapter II).
Chapter III addresses differences in the utilization of ice algal carbon by different
developmental stages of Antarctic krill (Furcilia larvae, juveniles, adults) during late
austral winter. It is shown that young developmental stages thrive significantly on ice
algae produced carbon to survive their first winter, receiving up to two thirds of their
carbon uptake from ice algae. The high spatial and temporal variability in diet and
carbon sources of AC0 krill (larvae, juveniles) across the sampling area in the northern
Weddell Sea is discussed in Chapter IV. Besides young E. superba, the amphipod Eusirus
latircarpus demonstrates a particularly high trophic dependency on sea ice-related
primary production during late austral winter, indicating a proportional contribution of
ice algal carbon of up to 67% of their energy budget. Other important energy linkers
indicate a switch from a predominantly pelagic lifestyle to a strong dependency on ice
algae-produced carbon as the winter season progressed (Chapter V). Among the other
abundant euphausiids collected offshore from the Filchner-Ronne Ice Shelf, Euphausia
crystallorophias and Thysanoessa macrura show that ice algal carbon can serve as
important carbon source during austral summer, accounting for up to 43% of the dietary
carbon in these species (Chapter VI).
In summary, the applied state-of-the art techniques and statistical models allow for a
reliable quantification of the contribution of ice algae-produced carbon to the carbon
budget of ecological key species in both Polar Regions. The results imply that
functioning and carbon dynamics of food webs in both Polar Regions are likely affected
by changes in sea ice coverage and thus ice algal primary production. Due to the close
connectivity between the sea ice ecosystem and the pelagic system, these consequences
will subsequently impact the entire polar ecosystems, their fish populations and
subsequently mammal populations. Moreover, these large amounts of required carbon
for the nutrition of polar food webs, currently fulfilled by ice algae, can likely not be
substituted by an increased pelagic primary production
Die Rolle eisalgen-produzierten Kohlenstoffs in arktischen und antarktischen Nahrungsnetzen
No full textThe underside of sea ice in Polar Regions represents a natural habitat for heterotrophic organisms, such as copepods and amphipods. This under-ice fauna plays a key role in transferring carbon synthesized by sea ice-associated (sympagic) microalgae into associated pelagic and benthic food webs of polar ecosystems. Animals at higher trophic levels are adapted to feed on the under-ice fauna as well as on pelagic zooplankton and nekton. Polar ecosystems thrive significantly on ice algae-produced carbon depending on different periods of the year. Thus, the under-ice fauna and the associated pelagic food web are largely affected by multi-scale climate changes accompanied by the reduction of sea ice coverage and an increasing duration of the melt season. Until now, however, the degree to which polar food webs depend on sea ice-derived carbon is unclear.
The overall aim of this thesis is to quantify the transfer of ice algae-produced carbon from the sea ice into the under-ice community and from there into pelagic food webs in Arctic and Antarctic ecosystems, in order to improve our understanding of the potential ecological consequences of a changing sea ice environment for marine food web dynamics. Furthermore, spatial and seasonal differences in the utilization of ice algae-produced carbon within and between both hemispheres are investigated.Die Unterseite des Meereises in den Polargebieten bietet einen natürlichen Lebensraum für heterotrophe Organismen, wie zum Beispiel für Ruderfußkrebse (Copepoda) und Flohkrebse (Amphipoda). Diese Untereisfauna spielt eine wichtige Rolle für die Weitergabe von durch Eisalgen produziertem Kohlenstoff in assoziierte pelagische und benthische Nahrungsnetze in Arktis und Antarktis. Höhere Organismen ernähren sich zum einen von diesen eis-assoziieren Organismen, aber auch von pelagischem Zooplankton und Nekton. Polare Ökosysteme können, je nach Jahreszeit, stark abhängig von dem von Eisalgen produzierten Kohlenstoff sein. Daher sind Untereis-Organismen und assoziierte pelagische Nahrungsnetze stark von klimatischen Veränderungen betroffen, die mit dem Rückgang der Meereisbedeckung und der Verlängerung der Eisschmelze einhergehen. Bis heute ist jedoch unklar, wie stark die Abhängigkeit polarer Nahrungsnetze von Eisalgenkohlenstoff ist.
Das Ziel dieser Arbeit ist es, zu quantifizieren, wieviel Eisalgenkohlenstoff von eis-assoziierten Organismen aufgenommen und als Nahrung an höhere Organismen in arktischen und antarktischen Nahrungsnetzen weitergeleitet wird. Dies ist wichtig, um potentielle Auswirkungen der Änderungen der Meereishabitate auf polare Ökosysteme besser abschätzen zu können. Ein weiteres Ziel ist es, regionale und saisonale Unterschiede im Transfer von Eisalgenkohlenstoff in beiden Hemispheren zu analysieren und zu vergleichen
Entwicklung einer Festphasenextraktionsmethode zur Anreicherung gelöster Lipide aus Meerwasser
No full textOn thin ice: the (variable) role of ice algae in Arctic food webs in a changing icescape
No full textDoreen D’Cruz, ‘Women, Time and Place in Fiona Kidman’s The Book of Secrets’, Journal of Commonwealth Literature, 42:3, September 2007, 63-81
No full textArticle review: In this absorbing article, Doreen D’Cruz considers New Zealand author Fiona Kidman’s 1987 novel, The Book of Secrets, from a feminist, dialogist and historiographical viewpoint, with reference to Kristeva, Bakhtin, Said, Friedman and Irigaray
O QUE DOREEN DIRIA SOBRE NÓS? UM ENSAIO SOBRE A PEDAGOGIA DA ESPERANÇA
No full textResumo:Este ensaio investe na análise da produção bibliográfica de Doreen Massey, com atenção focada nos títulos dirigidos aos cursos para o segmento do Ensino Superior, ministrados ou organizados por ela nas décadas de 1990-2000, na Open University (em Milton Keynes, Reino Unido). A aproximação a esses trabalhos – ainda sem tradução para o português – procura inventariar os aspectos pedagógicos nas construções epistemológicas da autora. O estudo da face pedagógica de Massey, ao considerar seus textos didáticos, busca um painel de ações, recursos e metodologias para uma possível adoção dos conteúdos da Geografia passíveis de serem inseridos na Educação Básica. Portanto, não se trata de uma incorporação vertical da academia para a escola, mas um estudo cujo inventário de procedimentos possa ser inspirador para a epistemologia escolar, considerando a potencialidade da concepção espacial desenvolvida pela a autora (MASSEY, 1995, 2004, 2006, 2008).Palavras-chave: Doreen Massey, Espaço, Ensino de Geografia. Abstract: This essay invests in the analysis of Doreen Massey's bibliographic production, with attention to the titles directed to Higher Education courses, taught or organized by her in the decades of 1990-2000, at the Open University (in Milton Keynes, UK). The approach to these works - without translation into Portuguese - seeks to set pedagogical aspects down in the author 's epistemological constructions. The study of the pedagogical bias of Massey provides a set of actions, resources and methodologies for a possible syllabus of Geography that can be adopted in elementary education. Therefore, it is not a vertical incorporation of the academy into the school, but a study whose inventory of procedures can be inspiring for school epistemology, considering the possibilities of the spatial conception (MASSEY, 1995, 2004, 2006, 2008).Keywords: Doreen Massey, Space, Geography Education. Resumén: Este ensayo realiza um análisis de la producción bibliográfica de Doreen Massey, con la atención enfocada en los títulos dirigidos a los cursos para el segmento de la Enseñanza Superior, impartidos o organizados por ella en las décadas de 1990-2000, en la Open University (en Milton Keynes, Reino Unido). La aproximación a esos trabajos - aún sin traducción al portugués - busca inventariar los aspectos pedagógicos en las construcciones epistemológicas de la autora. El estudio de la cara pedagógica de Massey, al considerar sus textos didácticos, busca un panel de acciones, recursos y metodologías para una posible adopción de los contenidos de la Geografía pasibles de ser adoptados en la Educación Básica. Por lo tanto, no se trata de una incorporación vertical del ámbito académico a la escuela, sino un estudio cuyo inventario de procedimientos puede ser inspirador para la epistemología escolar, considerando la potencialidad de la concepción espacial desarrollada por la autora (MASSEY, 1995, 2004, 2006, 2008).Palabras-clave: Doreen Massey, Espacio, Enseñanza de Geografía.</jats:p
“PELO ESPAÇO” NA VIA DE DOREEN MASSEY: UMA ANÁLISE PEDAGÓGICA DE “MATERIAL GEOGRAPHIES”
No full textThe aim of this article seeks to reflect on the pedagogical aspect in the extensive bibliographic production of the British Geography Doreen Massey. The current study deals with the content analysis of the chapter Geographies of solidarities, inserted in the pedagogical material of the course Material Geographies – a world in the making. This paperback, edited by Open University in 2008, is a pedagogical material adopted by the course of the same institution of distance education and at the same time it diffuses theoretical tendencies directed by Open Space Research. Our aim seeks to analyse the Bibliography of the author and to focuses on the titles directed by courses taught or organized by Massey in the 1990’s, at the Open University (in Milton Keynes, UK). This approach to these issues - still without a Portuguese translation –look forward a file Doreen Massey's pedagogical ideas and how it tie in the School Geography curriculum in BrazilA questão central deste estudo busca refletir sobre o aspecto pedagógico na extensa produção bibliográfica da geógrafa britânica Doreen Massey. O presente estudo se ocupará da análise de conteúdo do capítulo Geographies of solidarities, inserido no material pedagógico do curso Material Geographies – a world in the making. Tal publicação, editada pela Open University em 2008, trata-se de material pedagógico adotado para curso da mesma instituição de educação a distância (EAD) e que ao mesmo tempo difunde tendências teóricas dirigidas pela Open Space Research. Tal intuito investe na análise da produção bibliográfica da autora, com atenção focada nos títulos dirigidos aos cursos ministrados ou organizados por ela na década de 1990, na Open University (em Milton Keynes, Reino Unido). Esta aproximação com esses trabalhos – ainda sem tradução para o português – procura inventariar os aspectos pedagógicos de Doreen Massey e seus possíveis desdobramentos para o currículo da Geografia Escolar no Brasil
Walt Wandell Correspondence
No full textEntries include brief biographical information with a typographical spelling error, a typed introductory letter from the Maine State Library concerning the Maine Author Collection, a typed letter from Wandell residing in Colorado Springs, Colorado, discussing his work for the Monhegan Press on Monhegan Island, Maine, and a visit to Maine after World War II with his wife Doreen, a typed letter thanking Wandell for his inscription to Chips from the Granite, a typed letter from Wandell on plain note paper stationery with mention of his nomination for honorary membership in the International Mark Twain Society by Cyril Clemens and of Wells, Maine, poet Beulah Fenderson Smith featured in the Denver Post, and the typed transcript of a letter (with another typographical error) from the Maine State Library thanking an adopted Maine author for sending the Maine Author Collection his biographical information
Prolonging 1961 ::A communiqué sent to the future
No full textThis book is part of the Travelling Communiqué, a project that fosters a trans-disciplinary way of working together towards the idea of political friendship. At work since 2012, Travelling Communiqué has been initiating its own conditions of production within current globalising forces. Studying practices of decolonial thinking through the Presidential photo archive of Josip Broz Tito, at the Museum of Yugoslav History, Belgrade. With contributions by Fabian Bechtle, Radovan Cukić, Kodwo Eshun, Elizabeth W. Giorgis, Armin Linke, Mirko Lovrić, Ivan Manojlović, Olga Manojlović Pintar, Doreen Mende, Fred Moten, Sarah Poppel, The Otolith Group, Branimir Stojanović, Miki Stojanović, Milica Tomić, Vanessa Vasić-Janeković, Françoise Vergès, Jelena Vesić and Rachel O’Reilly, and students of the Dutch Art Institute as well as artists from Netsa Art Village in Addis Ababa. N.B. Hello fellow-authors: let me know your appearance on academia, and I will add you as co-author, if you wish, in case that you are not yet visible there
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