Michel Poulin | Canadian Museum of Nature (original) (raw)
Papers by Michel Poulin
Frontiers in Marine Science, 2020
Limnology and Oceanography, 2017
Ambiente & sociedade, 2007
Na busca de estratégias para a conservação dos recursos biológicos globais, vem sendo reconhecido... more Na busca de estratégias para a conservação dos recursos biológicos globais, vem sendo reconhecido, com intensidade crescente, que os métodos científicos convencionais e os arranjos institucionais nem sempre são eficientes para se lidar com a complexidade embutida nas dimensões biofísicas e sociopolíticas desta problemática. No enfrentamento desses desafios, torna-se necessária uma abordagem integrada, capaz de combinar métodos científicos com valores societários. As pesquisas participativas promovem mudanças sociais ao capacitarem as comunidades a encontrar opções adequadas - do ponto de vista coletivo e cultural - para a concretização do desenvolvimento sustentável nos seus próprios termos. A gestão ecossistêmica reconhece a interconectividade dos sistemas sociais e ecológicos e tenta articular a pesquisa científica, a formulação de políticas públicas e o estabelecimento de objetivos societários por meio de pesquisas interdisciplinares e processos de tomada de decisões envolvendo m...
European Journal of Phycology, 2010
Marine Ecology Progress Series, 2010
Journal of Phycology, 2013
Global climate change is having profound impacts on polar ice with changes in the duration and ex... more Global climate change is having profound impacts on polar ice with changes in the duration and extent of both land-fast ice and drift ice, which is part of the polar ice pack. Sea ice is a distinct habitat and the morphologically identifiable sympagic community living within sea ice can be readily distinguished from pelagic species. Sympagic metazoa and diatoms have been studied extensively since they can be identified using microscopy techniques. However, non-diatom eukaryotic cells living in ice have received much less attention despite taxa such as the dinoflagellate Polarella and the cercozoan Cryothecomonas being isolated from sea ice. Other small flagellates have also been reported, suggesting complex microbial food webs. Since smaller flagellates are fragile, often poorly preserved, and are difficult for non-experts to identify, we applied high throughput tag sequencing of the V4 region of the 18S rRNA gene to investigate the eukaryotic microbiome within the ice. The sea ice communities were diverse (190 taxa) and included many heterotrophic and mixotrophic species. Dinoflagellates (43 taxa), diatoms (29 taxa) and cercozoans (12 taxa) accounted for ~80% of the sequences. The sympagic communities living within drift ice and land-fast ice harbored taxonomically distinct communities and we highlight specific taxa of dinoflagellates and diatoms that may be indicators of land-fast and drift ice.
Continental Shelf Research, 2009
Continental Shelf Research, 2013
River Systems, 2011
... Temperature, rain and discharge Maximum, minimum and mean temperatures, cooling de-gree days,... more ... Temperature, rain and discharge Maximum, minimum and mean temperatures, cooling de-gree days, and total rain were gathered from three Environ-Fig. ... Reach1 Reach2 Reach-3 Reach4 DL median (min-max) median (min-max) median (min-max) median (min-max) ...
Diatom Research, 1996
... I Research Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Canada,KIP 6P... more ... I Research Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Canada,KIP 6P4 ... Europe (Hustedt 1922, Krammer & Lange-Bertalot 1986), northern Europe (Cleve-Euler 1955, Tynni 1976), possibly Russia (Skvortzow 1937), Greenland (Foged 1955), and ...
Diatom Research, 1997
Two new taxa within the proposed genus Porannulus are described from the body wall of Antarctic s... more Two new taxa within the proposed genus Porannulus are described from the body wall of Antarctic sponges. These diatoms are small organisms with either rhombic to linear (P. contentus) or nearly circular (P. contentus var. circulus) valves. The diagnostic character of the new genus is a linear row of simple, unoccluded pores (not portulae) present along the valve margins. Such pores are typically absent from the valve face. Frustules are, for their size, heavily silicified and are initially formed as transapical extensions from a primary sternum. Systematically, the new genus belongs to the order Fragilariales based on the araphid nature of the valve, the presence of a sternum in early stages of silicification and the rare presence of pores on the valve face. One or possibly two parietal plastids are associated with the pore openings around the valve margins. Of 54 Porifera (20 species) collected in Maxwell Bay, Antarctica, 52 samples contained specimens from the new genus. Porannulus dominated the diatom flora from the two sponges Axociella flabellata and Sphaerotylus antarcticus. The absence of areolae on the valve face and copulae of Porannulus may be a special adaptation to living in the mesohyl of sponges. Additional records were also observed from Synascidae gut samples.
Journal of Geophysical Research: Oceans, 2014
River Research and Applications, 2011
The main objective of the project was to assess how climate-induced variability and change in sea... more The main objective of the project was to assess how climate-induced variability and change in sea temperature, sea ice cover dynamics and the timing and intensity of river freshet affect marine biological productivity, fish stocks and marine mammals in Hudson Bay. This chapter summarizes the scientific activities conducted from icebreakers and land-based laboratories and observations from space. Large spatial and temporal variability was observed in the physical, chemical, and biological data. River plumes influence primary production, phytoplankton taxonomic composition, zooplankton dynamics and the feeding success and survival of fish larvae in Hudson Bay’s immense estuarine system.
Diatom Research, 1992
... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlD... more ... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlDN, M. POULIN, DF CHARLES & M. ANGELL from dated sediment cores to determine if lakes had acidified and, if so, by how much and when. ... WATERSHED SURF. MAX. pH ALK ...
Diatom research, 1992
... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlD... more ... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlDN, M. POULIN, DF CHARLES & M. ANGELL from dated sediment cores to determine if lakes had acidified and, if so, by how much and when. ... WATERSHED SURF. MAX. pH ALK ...
Diatom …, 1994
... Page 2. 304 PB HAMILTON, M. POULIN. C. PRfiVOST, M. ANGELL AND S. A. EDLUND ... EXSICCATA SUR... more ... Page 2. 304 PB HAMILTON, M. POULIN. C. PRfiVOST, M. ANGELL AND S. A. EDLUND ... EXSICCATA SURFACE MAX. TEMP pH COND CHL, CHL, PN POC Ca2+ Na+ K+ S042-Cl-Si02 SLIDE # AREA DEPTH (m2) (m) CC) (c1s.cm-1) - (mg.1-1) - (mg1-1) ...
Frontiers in Marine Science, 2020
Limnology and Oceanography, 2017
Ambiente & sociedade, 2007
Na busca de estratégias para a conservação dos recursos biológicos globais, vem sendo reconhecido... more Na busca de estratégias para a conservação dos recursos biológicos globais, vem sendo reconhecido, com intensidade crescente, que os métodos científicos convencionais e os arranjos institucionais nem sempre são eficientes para se lidar com a complexidade embutida nas dimensões biofísicas e sociopolíticas desta problemática. No enfrentamento desses desafios, torna-se necessária uma abordagem integrada, capaz de combinar métodos científicos com valores societários. As pesquisas participativas promovem mudanças sociais ao capacitarem as comunidades a encontrar opções adequadas - do ponto de vista coletivo e cultural - para a concretização do desenvolvimento sustentável nos seus próprios termos. A gestão ecossistêmica reconhece a interconectividade dos sistemas sociais e ecológicos e tenta articular a pesquisa científica, a formulação de políticas públicas e o estabelecimento de objetivos societários por meio de pesquisas interdisciplinares e processos de tomada de decisões envolvendo m...
European Journal of Phycology, 2010
Marine Ecology Progress Series, 2010
Journal of Phycology, 2013
Global climate change is having profound impacts on polar ice with changes in the duration and ex... more Global climate change is having profound impacts on polar ice with changes in the duration and extent of both land-fast ice and drift ice, which is part of the polar ice pack. Sea ice is a distinct habitat and the morphologically identifiable sympagic community living within sea ice can be readily distinguished from pelagic species. Sympagic metazoa and diatoms have been studied extensively since they can be identified using microscopy techniques. However, non-diatom eukaryotic cells living in ice have received much less attention despite taxa such as the dinoflagellate Polarella and the cercozoan Cryothecomonas being isolated from sea ice. Other small flagellates have also been reported, suggesting complex microbial food webs. Since smaller flagellates are fragile, often poorly preserved, and are difficult for non-experts to identify, we applied high throughput tag sequencing of the V4 region of the 18S rRNA gene to investigate the eukaryotic microbiome within the ice. The sea ice communities were diverse (190 taxa) and included many heterotrophic and mixotrophic species. Dinoflagellates (43 taxa), diatoms (29 taxa) and cercozoans (12 taxa) accounted for ~80% of the sequences. The sympagic communities living within drift ice and land-fast ice harbored taxonomically distinct communities and we highlight specific taxa of dinoflagellates and diatoms that may be indicators of land-fast and drift ice.
Continental Shelf Research, 2009
Continental Shelf Research, 2013
River Systems, 2011
... Temperature, rain and discharge Maximum, minimum and mean temperatures, cooling de-gree days,... more ... Temperature, rain and discharge Maximum, minimum and mean temperatures, cooling de-gree days, and total rain were gathered from three Environ-Fig. ... Reach1 Reach2 Reach-3 Reach4 DL median (min-max) median (min-max) median (min-max) median (min-max) ...
Diatom Research, 1996
... I Research Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Canada,KIP 6P... more ... I Research Division, Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Canada,KIP 6P4 ... Europe (Hustedt 1922, Krammer & Lange-Bertalot 1986), northern Europe (Cleve-Euler 1955, Tynni 1976), possibly Russia (Skvortzow 1937), Greenland (Foged 1955), and ...
Diatom Research, 1997
Two new taxa within the proposed genus Porannulus are described from the body wall of Antarctic s... more Two new taxa within the proposed genus Porannulus are described from the body wall of Antarctic sponges. These diatoms are small organisms with either rhombic to linear (P. contentus) or nearly circular (P. contentus var. circulus) valves. The diagnostic character of the new genus is a linear row of simple, unoccluded pores (not portulae) present along the valve margins. Such pores are typically absent from the valve face. Frustules are, for their size, heavily silicified and are initially formed as transapical extensions from a primary sternum. Systematically, the new genus belongs to the order Fragilariales based on the araphid nature of the valve, the presence of a sternum in early stages of silicification and the rare presence of pores on the valve face. One or possibly two parietal plastids are associated with the pore openings around the valve margins. Of 54 Porifera (20 species) collected in Maxwell Bay, Antarctica, 52 samples contained specimens from the new genus. Porannulus dominated the diatom flora from the two sponges Axociella flabellata and Sphaerotylus antarcticus. The absence of areolae on the valve face and copulae of Porannulus may be a special adaptation to living in the mesohyl of sponges. Additional records were also observed from Synascidae gut samples.
Journal of Geophysical Research: Oceans, 2014
River Research and Applications, 2011
The main objective of the project was to assess how climate-induced variability and change in sea... more The main objective of the project was to assess how climate-induced variability and change in sea temperature, sea ice cover dynamics and the timing and intensity of river freshet affect marine biological productivity, fish stocks and marine mammals in Hudson Bay. This chapter summarizes the scientific activities conducted from icebreakers and land-based laboratories and observations from space. Large spatial and temporal variability was observed in the physical, chemical, and biological data. River plumes influence primary production, phytoplankton taxonomic composition, zooplankton dynamics and the feeding success and survival of fish larvae in Hudson Bay’s immense estuarine system.
Diatom Research, 1992
... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlD... more ... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlDN, M. POULIN, DF CHARLES & M. ANGELL from dated sediment cores to determine if lakes had acidified and, if so, by how much and when. ... WATERSHED SURF. MAX. pH ALK ...
Diatom research, 1992
... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlD... more ... One of the objectives of this project was to analyze diatom assemblages Page 2. 26 PB HAMILlDN, M. POULIN, DF CHARLES & M. ANGELL from dated sediment cores to determine if lakes had acidified and, if so, by how much and when. ... WATERSHED SURF. MAX. pH ALK ...
Diatom …, 1994
... Page 2. 304 PB HAMILTON, M. POULIN. C. PRfiVOST, M. ANGELL AND S. A. EDLUND ... EXSICCATA SUR... more ... Page 2. 304 PB HAMILTON, M. POULIN. C. PRfiVOST, M. ANGELL AND S. A. EDLUND ... EXSICCATA SURFACE MAX. TEMP pH COND CHL, CHL, PN POC Ca2+ Na+ K+ S042-Cl-Si02 SLIDE # AREA DEPTH (m2) (m) CC) (c1s.cm-1) - (mg.1-1) - (mg1-1) ...