Paul Wassmann - Academia.edu (original) (raw)

Papers by Paul Wassmann

VLIZ Special Publication, 2011

Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in ... more Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.

Frontiers in Marine Science

In 2011, a first comprehensive assessment of the footprints of climate change on Arctic marine ec... more In 2011, a first comprehensive assessment of the footprints of climate change on Arctic marine ecosystems (such as altered distribution ranges, abundances, growth and body conditions, behaviours and phenologies, as well as community and regime shifts) was published. Here, we re-assess the climate-driven impacts reported since then, to elucidate to which extent and how observed ecological footprints have changed in the following decade (2011 to 2021). In total, 98 footprints have been described and analysed. Most of those impacts reported in the 2011 assessment are reconfirmed and can, hence, be assumed as continuing trends. In addition, novel footprints (behavioural changes, diet changes, altered competition and pathogen load) are described. As in 2011, most reported footprints are related to changes in distribution ranges, abundances, biomass and production. Range shifts have mostly been observed for fish species, while behavioural changes have mainly been reported for mammals. Pri...

participantGeochemical fluxes have received particular attention in marine ecosystems in the cont... more participantGeochemical fluxes have received particular attention in marine ecosystems in the context of climate changes and potential CO2 sequestration by the oceans. In addition, areas where changes are expected to be the most important and the fastest are the polar ones and especially the Arctic Ocean. It is thus particularly important to better understand the role played by marine biological pump in regulating the essential elements, which are carbon, nitrogen but also phosphorous, in Arctic seas. Most of the regulation through the biological pump is realised by primary and secondary producers. In the arctic, few data are available on C, N and P elements and ratios of secondary producers. Those ratios can change according to several parameters including species, development stage, feeding mode, etc... Secondary producers are represented by zooplankton, of which 90% are copepods. One result of their feeding activities is the creation of faecal pellets, which can sink out of the eu...

American Geophysical Union eBooks, Feb 1, 2016

Frontiers Research Topics, 2021

Consejo Superior de Investigaciones Científicas (España), Jan 31, 2012

Datos técnicos: 4 minutos, color, español e inglés con subtítulos en español. Ficha técnica: Gabi... more Datos técnicos: 4 minutos, color, español e inglés con subtítulos en español. Ficha técnica: Gabinete de Presidencia CSIC y Departamento de ComunicaciónN

Frontiers in Marine Science, 2021

Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South,... more Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, SpainOcean acidification and warming are two main consequences of climate change that can directly affect organismal and ecosystem processes in marine ecosystems. This is especially true in the Arctic Ocean where temperatures are increasing 2-3 times the global rate and inherent cold temperatures and recent ice cover loss increases its vulnerability to ocean acidification. We carried out a microcosm experiment with a plankton community collected from a high Arctic Fjord (Isfjorden, Svalbard Islands) to analyze how the interaction between acidification (changes in pH, by bubbling CO2) and warming (1°C, 6°C and 10°C) could affect bacterial, protists and viral processes as bacterial production (BP), bacterial mortality by protists and viruses, and lytic vs lysogenic (LysoVP) viral production. We obtained that a 48% and a 79% of BP variability is explained by pH at 6° C and at 10°C, respectively, while at 1ºC pH also explicated a 49% variability of the percentage of bacterial removed by protists. Furthermore, pH were responsible of 86% of LysoVP and 94% of the percentage of LysoVP variability, at 10°C. However no pattern for lytic viral production and lysed bacteria were observed with pH at different temperatures. Consequently, pH together with temperature contributes to modify BP, grazing by predators, and to introduce changes in the virus cycle infection promoting LysoVP at low pH and at high temperature. This experiment provides hints to how these altered microbial processes could intervene with the carbon cycle in the Arctic OceanPeer Reviewe

Partnerships in Marine Research, 2022

length, weight, maturity stage, stomach filling degree and age of capelin. Some capelin were also... more length, weight, maturity stage, stomach filling degree and age of capelin. Some capelin were also preserved by freezing for later identification of stomach content in relation to food resources. RESULTS Only a part of the data collected during the cruise are worked up until now. In this report, the horizontal and vertical distribution of temperature and salinity are briefly described together with the distribution of chlorophyll ~ and nutrients. In addition, some selected stations (which were common for most of the participating scientists) are described in more detail. The zooplankton results are concentrated to the description of its vertical distribution and species composition. Horizontal distribution of hydrography and chlorophyll a The horizontal distribution of temperature and salinity at 50 m are shown in Fig. 2. This depth is below the pycnocline, and the water masses are therefore not influenced either by melt water .or by temperature heating from the atmosphere. Consequently, Fig. 2 indicates the areas which were occupied by Arctic and Atlantic water masses, and also shows the position of the qceanic Polar front. Water with temperature below o 0 c and with salinity from 34.4 to. 34.6°/oo is usually characterized as Arctic water (LOENG 1985), while water of.-At'la'ntic orig_ i.n. iri ,thi-s. . ar.e.a ,.ha•s "s _ alini ty , a-b:ove 0 .-.. '. .. .. 0 ". . • 34.9 /oo. . Water with sa~inity between 34-;6 and 34.9 • /oo is a mixture between these two main water masses. The position of the soutbqoing BeaI: Island Current is easily seen between the tw~• sh~~P fro~ts in the temperature distribution along the eastern slope of the Svalbard Bank, from Hopen 0 south to Bear Island. the core had a temperature below-1 C. The western front was against a •penna-nent_ ~.ddy above the most shallow part of the bank area, whi'le • the .• eastern front was against the Atlantic water which is flowing northwar4s. 40 1. 0 0. 1 x Eco l ogical inve s ti gations in t he Barent s Sea , Augus t 1985. Report f r om PRO MARE-cru ise no 5. Ecologic al investigations in the Ba r ents Sea, August 1985.

VLIZ Special Publication, 2011

Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in ... more Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.

Frontiers in Marine Science

In 2011, a first comprehensive assessment of the footprints of climate change on Arctic marine ec... more In 2011, a first comprehensive assessment of the footprints of climate change on Arctic marine ecosystems (such as altered distribution ranges, abundances, growth and body conditions, behaviours and phenologies, as well as community and regime shifts) was published. Here, we re-assess the climate-driven impacts reported since then, to elucidate to which extent and how observed ecological footprints have changed in the following decade (2011 to 2021). In total, 98 footprints have been described and analysed. Most of those impacts reported in the 2011 assessment are reconfirmed and can, hence, be assumed as continuing trends. In addition, novel footprints (behavioural changes, diet changes, altered competition and pathogen load) are described. As in 2011, most reported footprints are related to changes in distribution ranges, abundances, biomass and production. Range shifts have mostly been observed for fish species, while behavioural changes have mainly been reported for mammals. Pri...

participantGeochemical fluxes have received particular attention in marine ecosystems in the cont... more participantGeochemical fluxes have received particular attention in marine ecosystems in the context of climate changes and potential CO2 sequestration by the oceans. In addition, areas where changes are expected to be the most important and the fastest are the polar ones and especially the Arctic Ocean. It is thus particularly important to better understand the role played by marine biological pump in regulating the essential elements, which are carbon, nitrogen but also phosphorous, in Arctic seas. Most of the regulation through the biological pump is realised by primary and secondary producers. In the arctic, few data are available on C, N and P elements and ratios of secondary producers. Those ratios can change according to several parameters including species, development stage, feeding mode, etc... Secondary producers are represented by zooplankton, of which 90% are copepods. One result of their feeding activities is the creation of faecal pellets, which can sink out of the eu...

American Geophysical Union eBooks, Feb 1, 2016

Frontiers Research Topics, 2021

Consejo Superior de Investigaciones Científicas (España), Jan 31, 2012

Datos técnicos: 4 minutos, color, español e inglés con subtítulos en español. Ficha técnica: Gabi... more Datos técnicos: 4 minutos, color, español e inglés con subtítulos en español. Ficha técnica: Gabinete de Presidencia CSIC y Departamento de ComunicaciónN

Frontiers in Marine Science, 2021

Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South,... more Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, SpainOcean acidification and warming are two main consequences of climate change that can directly affect organismal and ecosystem processes in marine ecosystems. This is especially true in the Arctic Ocean where temperatures are increasing 2-3 times the global rate and inherent cold temperatures and recent ice cover loss increases its vulnerability to ocean acidification. We carried out a microcosm experiment with a plankton community collected from a high Arctic Fjord (Isfjorden, Svalbard Islands) to analyze how the interaction between acidification (changes in pH, by bubbling CO2) and warming (1°C, 6°C and 10°C) could affect bacterial, protists and viral processes as bacterial production (BP), bacterial mortality by protists and viruses, and lytic vs lysogenic (LysoVP) viral production. We obtained that a 48% and a 79% of BP variability is explained by pH at 6° C and at 10°C, respectively, while at 1ºC pH also explicated a 49% variability of the percentage of bacterial removed by protists. Furthermore, pH were responsible of 86% of LysoVP and 94% of the percentage of LysoVP variability, at 10°C. However no pattern for lytic viral production and lysed bacteria were observed with pH at different temperatures. Consequently, pH together with temperature contributes to modify BP, grazing by predators, and to introduce changes in the virus cycle infection promoting LysoVP at low pH and at high temperature. This experiment provides hints to how these altered microbial processes could intervene with the carbon cycle in the Arctic OceanPeer Reviewe

Partnerships in Marine Research, 2022

length, weight, maturity stage, stomach filling degree and age of capelin. Some capelin were also... more length, weight, maturity stage, stomach filling degree and age of capelin. Some capelin were also preserved by freezing for later identification of stomach content in relation to food resources. RESULTS Only a part of the data collected during the cruise are worked up until now. In this report, the horizontal and vertical distribution of temperature and salinity are briefly described together with the distribution of chlorophyll ~ and nutrients. In addition, some selected stations (which were common for most of the participating scientists) are described in more detail. The zooplankton results are concentrated to the description of its vertical distribution and species composition. Horizontal distribution of hydrography and chlorophyll a The horizontal distribution of temperature and salinity at 50 m are shown in Fig. 2. This depth is below the pycnocline, and the water masses are therefore not influenced either by melt water .or by temperature heating from the atmosphere. Consequently, Fig. 2 indicates the areas which were occupied by Arctic and Atlantic water masses, and also shows the position of the qceanic Polar front. Water with temperature below o 0 c and with salinity from 34.4 to. 34.6°/oo is usually characterized as Arctic water (LOENG 1985), while water of.-At'la'ntic orig_ i.n. iri ,thi-s. . ar.e.a ,.ha•s "s _ alini ty , a-b:ove 0 .-.. '. .. .. 0 ". . • 34.9 /oo. . Water with sa~inity between 34-;6 and 34.9 • /oo is a mixture between these two main water masses. The position of the soutbqoing BeaI: Island Current is easily seen between the tw~• sh~~P fro~ts in the temperature distribution along the eastern slope of the Svalbard Bank, from Hopen 0 south to Bear Island. the core had a temperature below-1 C. The western front was against a •penna-nent_ ~.ddy above the most shallow part of the bank area, whi'le • the .• eastern front was against the Atlantic water which is flowing northwar4s. 40 1. 0 0. 1 x Eco l ogical inve s ti gations in t he Barent s Sea , Augus t 1985. Report f r om PRO MARE-cru ise no 5. Ecologic al investigations in the Ba r ents Sea, August 1985.