Effects of temperature regime on primary producers in Icelandic geothermal streams

Rakel Gudmundsdottir; Gisli Mar Gislason; Snaebjorn Palsson; Jon S. Olafsson; Anders Schomacker; Nikolai Friberg; Guy Woodward; Elisabet R. Hannesdottir; Brian Moss

doi:10.1016/j.aquabot.2011.08.003

Effects of temperature regime on primary producers in Icelandic geothermal streams

Rakel Gudmundsdottir
, Gisli Mar Gislason
, Snaebjorn Palsson
, Jon S. Olafsson
, Anders Schomacker
, Nikolai Friberg
, Guy Woodward
, Elisabet R. Hannesdottir
, Brian Moss

Líf- og umhverfisvísindadeild

Háskóli Íslands

Rannsóknarafurð: Framlag til fræðitímarits › Grein › ritrýni

Útdráttur

Eight adjacent sub-arctic streams with consistently different temperatures but broadly similar chemistry, other than some differences in conductivity and linked pH, were used to investigate effects of temperature regime on the structure of primary producer communities. Grazing by invertebrates was also taken into account to detect possible effects on the primary producers.The moss species Fontinalis antipyretica Hedw. (Bryophyta) was only observed in the warmer streams and its cover was positively linked with temperature. The liverwort Jungermannia exsertifolia (Steph.) was absent from the warmer streams and scarce in the colder streams. The biomass of F. antipyretica was inversely correlated with concentration of epilithic chlorophyll a, possibly due to shading from the bryophyte and/or competition between algae and bryophytes for nutrients. Epilithic algae and bryophyte biomass were not related to density of the main grazer, Radix peregra Müller (Gastropoda).A high biovolume of green algae (Chlorophyta) occurred in all streams. The biovolume Cyanobacteria was greatest in the coldest stream and in the two intermediately warm streams. Diatom biovolume was low compared with the biovolumes of Cyanobacteria and green algae in all streams, except in the two warmest streams, where the highest biovolume of diatom occurred.Regularized Canonical Correlation Analysis (RCCA) classification based on all primary producer assemblages and invertebrates indicated that warm streams (16.7-22.2°C) were similar to each other. It also showed that the colder streams (6.6-13.2°C) were different from the warmer streams and from each other because of differences in conductivity. Temperature and conductivity were the most influential variables in determining overall stream diversity.

Upprunalegt tungumál	Enska
Síður (frá-til)	278-286
Síðufjöldi	9
Fræðitímarit	Aquatic Botany
Bindi	95
Númer tölublaðs	4
DOI	https://doi.org/10.1016/j.aquabot.2011.08.003
Útgáfustaða	Útgefið - nóv. 2011

Athugasemd

Funding Information: The authors would like to thank Kristinn Ólafur Kristinsson for field assistance, Hlynur Bárðarson, John Bøhme Christensen and Saga Svavarsdóttir for field and laboratory assistance. Professor Helge Reinertsen at NTNU (Norwegian University of Science and Technology) is thanked for providing RG with facilities to write and analyze data in Norway. We also thank Dr. Hákon Aðalsteinsson for providing a converted microscope and other microscope equipment. Dr. Karl Gunnarsson and the Marine Research Institute of Iceland kindly assisted with a converted microscope in the beginning of the project. The late Dr. Bergþór Jóhannsson helped us with the identifications on the bryophytes and for that we are thankful. We are also grateful to the editor and two anonymous referees for their helpful comments. We thank the European Union (Eurolimpacs project GOCECT-2003-505540), the Icelandic Centre for Research (Grant no. 080235023 ) and the Assistantship Fund of the University of Iceland (2007–2009) for financial support.

Aðgangur að skjali

10.1016/j.aquabot.2011.08.003

Vitna í þetta

@article{2a6f8e0e39704621b23b201127fd5afa,

title = "Effects of temperature regime on primary producers in Icelandic geothermal streams",

abstract = "Eight adjacent sub-arctic streams with consistently different temperatures but broadly similar chemistry, other than some differences in conductivity and linked pH, were used to investigate effects of temperature regime on the structure of primary producer communities. Grazing by invertebrates was also taken into account to detect possible effects on the primary producers.The moss species Fontinalis antipyretica Hedw. (Bryophyta) was only observed in the warmer streams and its cover was positively linked with temperature. The liverwort Jungermannia exsertifolia (Steph.) was absent from the warmer streams and scarce in the colder streams. The biomass of F. antipyretica was inversely correlated with concentration of epilithic chlorophyll a, possibly due to shading from the bryophyte and/or competition between algae and bryophytes for nutrients. Epilithic algae and bryophyte biomass were not related to density of the main grazer, Radix peregra M{\"u}ller (Gastropoda).A high biovolume of green algae (Chlorophyta) occurred in all streams. The biovolume Cyanobacteria was greatest in the coldest stream and in the two intermediately warm streams. Diatom biovolume was low compared with the biovolumes of Cyanobacteria and green algae in all streams, except in the two warmest streams, where the highest biovolume of diatom occurred.Regularized Canonical Correlation Analysis (RCCA) classification based on all primary producer assemblages and invertebrates indicated that warm streams (16.7-22.2°C) were similar to each other. It also showed that the colder streams (6.6-13.2°C) were different from the warmer streams and from each other because of differences in conductivity. Temperature and conductivity were the most influential variables in determining overall stream diversity.",

keywords = "Climate change, Epilithic alga, Fontinalis antipyretica, Grazing, Thermal stream",

author = "Rakel Gudmundsdottir and Gislason, \{Gisli Mar\} and Snaebjorn Palsson and Olafsson, \{Jon S.\} and Anders Schomacker and Nikolai Friberg and Guy Woodward and Hannesdottir, \{Elisabet R.\} and Brian Moss",

note = "Funding Information: The authors would like to thank Kristinn {\'O}lafur Kristinsson for field assistance, Hlynur B{\'a}r{\dh}arson, John B{\o}hme Christensen and Saga Svavarsd{\'o}ttir for field and laboratory assistance. Professor Helge Reinertsen at NTNU (Norwegian University of Science and Technology) is thanked for providing RG with facilities to write and analyze data in Norway. We also thank Dr. H{\'a}kon A{\dh}alsteinsson for providing a converted microscope and other microscope equipment. Dr. Karl Gunnarsson and the Marine Research Institute of Iceland kindly assisted with a converted microscope in the beginning of the project. The late Dr. Berg{\th}{\'o}r J{\'o}hannsson helped us with the identifications on the bryophytes and for that we are thankful. We are also grateful to the editor and two anonymous referees for their helpful comments. We thank the European Union (Eurolimpacs project GOCECT-2003-505540), the Icelandic Centre for Research (Grant no. 080235023 ) and the Assistantship Fund of the University of Iceland (2007–2009) for financial support.",

year = "2011",

month = nov,

doi = "10.1016/j.aquabot.2011.08.003",

language = "English",

volume = "95",

pages = "278--286",

journal = "Aquatic Botany",

issn = "0304-3770",

publisher = "Elsevier B.V.",

number = "4",

}

TY - JOUR

T1 - Effects of temperature regime on primary producers in Icelandic geothermal streams

AU - Gudmundsdottir, Rakel

AU - Gislason, Gisli Mar

AU - Palsson, Snaebjorn

AU - Olafsson, Jon S.

AU - Schomacker, Anders

AU - Friberg, Nikolai

AU - Woodward, Guy

AU - Hannesdottir, Elisabet R.

AU - Moss, Brian

N1 - Funding Information: The authors would like to thank Kristinn Ólafur Kristinsson for field assistance, Hlynur Bárðarson, John Bøhme Christensen and Saga Svavarsdóttir for field and laboratory assistance. Professor Helge Reinertsen at NTNU (Norwegian University of Science and Technology) is thanked for providing RG with facilities to write and analyze data in Norway. We also thank Dr. Hákon Aðalsteinsson for providing a converted microscope and other microscope equipment. Dr. Karl Gunnarsson and the Marine Research Institute of Iceland kindly assisted with a converted microscope in the beginning of the project. The late Dr. Bergþór Jóhannsson helped us with the identifications on the bryophytes and for that we are thankful. We are also grateful to the editor and two anonymous referees for their helpful comments. We thank the European Union (Eurolimpacs project GOCECT-2003-505540), the Icelandic Centre for Research (Grant no. 080235023 ) and the Assistantship Fund of the University of Iceland (2007–2009) for financial support.

PY - 2011/11

Y1 - 2011/11

N2 - Eight adjacent sub-arctic streams with consistently different temperatures but broadly similar chemistry, other than some differences in conductivity and linked pH, were used to investigate effects of temperature regime on the structure of primary producer communities. Grazing by invertebrates was also taken into account to detect possible effects on the primary producers.The moss species Fontinalis antipyretica Hedw. (Bryophyta) was only observed in the warmer streams and its cover was positively linked with temperature. The liverwort Jungermannia exsertifolia (Steph.) was absent from the warmer streams and scarce in the colder streams. The biomass of F. antipyretica was inversely correlated with concentration of epilithic chlorophyll a, possibly due to shading from the bryophyte and/or competition between algae and bryophytes for nutrients. Epilithic algae and bryophyte biomass were not related to density of the main grazer, Radix peregra Müller (Gastropoda).A high biovolume of green algae (Chlorophyta) occurred in all streams. The biovolume Cyanobacteria was greatest in the coldest stream and in the two intermediately warm streams. Diatom biovolume was low compared with the biovolumes of Cyanobacteria and green algae in all streams, except in the two warmest streams, where the highest biovolume of diatom occurred.Regularized Canonical Correlation Analysis (RCCA) classification based on all primary producer assemblages and invertebrates indicated that warm streams (16.7-22.2°C) were similar to each other. It also showed that the colder streams (6.6-13.2°C) were different from the warmer streams and from each other because of differences in conductivity. Temperature and conductivity were the most influential variables in determining overall stream diversity.

AB - Eight adjacent sub-arctic streams with consistently different temperatures but broadly similar chemistry, other than some differences in conductivity and linked pH, were used to investigate effects of temperature regime on the structure of primary producer communities. Grazing by invertebrates was also taken into account to detect possible effects on the primary producers.The moss species Fontinalis antipyretica Hedw. (Bryophyta) was only observed in the warmer streams and its cover was positively linked with temperature. The liverwort Jungermannia exsertifolia (Steph.) was absent from the warmer streams and scarce in the colder streams. The biomass of F. antipyretica was inversely correlated with concentration of epilithic chlorophyll a, possibly due to shading from the bryophyte and/or competition between algae and bryophytes for nutrients. Epilithic algae and bryophyte biomass were not related to density of the main grazer, Radix peregra Müller (Gastropoda).A high biovolume of green algae (Chlorophyta) occurred in all streams. The biovolume Cyanobacteria was greatest in the coldest stream and in the two intermediately warm streams. Diatom biovolume was low compared with the biovolumes of Cyanobacteria and green algae in all streams, except in the two warmest streams, where the highest biovolume of diatom occurred.Regularized Canonical Correlation Analysis (RCCA) classification based on all primary producer assemblages and invertebrates indicated that warm streams (16.7-22.2°C) were similar to each other. It also showed that the colder streams (6.6-13.2°C) were different from the warmer streams and from each other because of differences in conductivity. Temperature and conductivity were the most influential variables in determining overall stream diversity.

KW - Climate change

KW - Epilithic alga

KW - Fontinalis antipyretica

KW - Grazing

KW - Thermal stream

UR - https://www.scopus.com/pages/publications/80855130566

U2 - 10.1016/j.aquabot.2011.08.003

DO - 10.1016/j.aquabot.2011.08.003

M3 - Article

SN - 0304-3770

VL - 95

SP - 278

EP - 286

JO - Aquatic Botany

JF - Aquatic Botany

IS - 4

ER -

Effects of temperature regime on primary producers in Icelandic geothermal streams

Útdráttur

Athugasemd

Aðgangur að skjali

Fingerprint

Vitna í þetta