Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord.

Anne Thonig, Gary Thomas Banta, Jenni Kesäniemi, K Emily Knott, Benni Winding Hansen

Publikation: KonferencebidragKonferenceabstrakt til konferenceForskning

Resumé

We sampled populations of Pygospio elegans at four locations (Lynæs, Lammefjord, Vellerup, Herslev) in the Isefjord - Roskilde Fjord estuary complex with approximately monthly intervals from March to November 2014. The goal of this study is to compare the population dynamics, with special focus on reproduction and development, for P. elegans populations exposed to differing environmental factors and that have, based on previous work, different genetic compositions. We wanted to examine to what extent environmental versus genetic factors determine the population dynamics and reproductive mode for this species. We determined the size distribution and the developmental and reproductive status and sex (when possible) of at least 30 individuals from each sampling. Temperature and salinity were continuously monitored by in situ loggers at the same sites. Sediment characteristics (particle size distribution, water content, organic content) were determined at 4 times (March, May, August, November). The major difference between the sites was that Herslev had notably lower (average of 12 ‰) and more variable salinity than the other 3 sites (average of 18 ‰). There were small spatial and temporal differences in the other sediment characteristics. During spring, all populations were reproductively active (Fig. 1), but to a greater extent at Vellerup and Herslev. Juveniles appeared at all sites during summer and again in the fall but numbers were reduced during late summer. All populations began to reproduce again during fall although to varying degrees. More detailed analyses of seasonal changes in worm size and reproductive mode and how this relates to environmental variables will be presented.
OriginalsprogDansk
Publikationsdato28 jan. 2015
StatusUdgivet - 28 jan. 2015
BegivenhedDansk Havforskermøde - GEUS, Copenhagen, Danmark
Varighed: 28 jan. 201530 jan. 2015
Konferencens nummer: 18
http://havforsk2015.geus.dk/index.shtml

Konference

KonferenceDansk Havforskermøde
Nummer18
LokationGEUS
LandDanmark
ByCopenhagen
Periode28/01/201530/01/2015
Internetadresse

Emneord

  • bundfauna
  • fjord
  • population biology

Citer dette

Thonig, A., Banta, G. T., Kesäniemi, J., Knott, K. E., & Hansen, B. W. (2015). Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord.. Abstract fra Dansk Havforskermøde, Copenhagen, Danmark.
Thonig, Anne ; Banta, Gary Thomas ; Kesäniemi, Jenni ; Knott, K Emily ; Hansen, Benni Winding. / Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord. Abstract fra Dansk Havforskermøde, Copenhagen, Danmark.
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abstract = "We sampled populations of Pygospio elegans at four locations (Lyn{\ae}s, Lammefjord, Vellerup, Herslev) in the Isefjord - Roskilde Fjord estuary complex with approximately monthly intervals from March to November 2014. The goal of this study is to compare the population dynamics, with special focus on reproduction and development, for P. elegans populations exposed to differing environmental factors and that have, based on previous work, different genetic compositions. We wanted to examine to what extent environmental versus genetic factors determine the population dynamics and reproductive mode for this species. We determined the size distribution and the developmental and reproductive status and sex (when possible) of at least 30 individuals from each sampling. Temperature and salinity were continuously monitored by in situ loggers at the same sites. Sediment characteristics (particle size distribution, water content, organic content) were determined at 4 times (March, May, August, November). The major difference between the sites was that Herslev had notably lower (average of 12 ‰) and more variable salinity than the other 3 sites (average of 18 ‰). There were small spatial and temporal differences in the other sediment characteristics. During spring, all populations were reproductively active (Fig. 1), but to a greater extent at Vellerup and Herslev. Juveniles appeared at all sites during summer and again in the fall but numbers were reduced during late summer. All populations began to reproduce again during fall although to varying degrees. More detailed analyses of seasonal changes in worm size and reproductive mode and how this relates to environmental variables will be presented.",
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year = "2015",
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note = "Dansk Havforskerm{\o}de ; Conference date: 28-01-2015 Through 30-01-2015",
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Thonig, A, Banta, GT, Kesäniemi, J, Knott, KE & Hansen, BW 2015, 'Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord.' Dansk Havforskermøde, Copenhagen, Danmark, 28/01/2015 - 30/01/2015, .

Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord. / Thonig, Anne; Banta, Gary Thomas; Kesäniemi, Jenni; Knott, K Emily; Hansen, Benni Winding.

2015. Abstract fra Dansk Havforskermøde, Copenhagen, Danmark.

Publikation: KonferencebidragKonferenceabstrakt til konferenceForskning

TY - ABST

T1 - Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord.

AU - Thonig, Anne

AU - Banta, Gary Thomas

AU - Kesäniemi, Jenni

AU - Knott, K Emily

AU - Hansen, Benni Winding

PY - 2015/1/28

Y1 - 2015/1/28

N2 - We sampled populations of Pygospio elegans at four locations (Lynæs, Lammefjord, Vellerup, Herslev) in the Isefjord - Roskilde Fjord estuary complex with approximately monthly intervals from March to November 2014. The goal of this study is to compare the population dynamics, with special focus on reproduction and development, for P. elegans populations exposed to differing environmental factors and that have, based on previous work, different genetic compositions. We wanted to examine to what extent environmental versus genetic factors determine the population dynamics and reproductive mode for this species. We determined the size distribution and the developmental and reproductive status and sex (when possible) of at least 30 individuals from each sampling. Temperature and salinity were continuously monitored by in situ loggers at the same sites. Sediment characteristics (particle size distribution, water content, organic content) were determined at 4 times (March, May, August, November). The major difference between the sites was that Herslev had notably lower (average of 12 ‰) and more variable salinity than the other 3 sites (average of 18 ‰). There were small spatial and temporal differences in the other sediment characteristics. During spring, all populations were reproductively active (Fig. 1), but to a greater extent at Vellerup and Herslev. Juveniles appeared at all sites during summer and again in the fall but numbers were reduced during late summer. All populations began to reproduce again during fall although to varying degrees. More detailed analyses of seasonal changes in worm size and reproductive mode and how this relates to environmental variables will be presented.

AB - We sampled populations of Pygospio elegans at four locations (Lynæs, Lammefjord, Vellerup, Herslev) in the Isefjord - Roskilde Fjord estuary complex with approximately monthly intervals from March to November 2014. The goal of this study is to compare the population dynamics, with special focus on reproduction and development, for P. elegans populations exposed to differing environmental factors and that have, based on previous work, different genetic compositions. We wanted to examine to what extent environmental versus genetic factors determine the population dynamics and reproductive mode for this species. We determined the size distribution and the developmental and reproductive status and sex (when possible) of at least 30 individuals from each sampling. Temperature and salinity were continuously monitored by in situ loggers at the same sites. Sediment characteristics (particle size distribution, water content, organic content) were determined at 4 times (March, May, August, November). The major difference between the sites was that Herslev had notably lower (average of 12 ‰) and more variable salinity than the other 3 sites (average of 18 ‰). There were small spatial and temporal differences in the other sediment characteristics. During spring, all populations were reproductively active (Fig. 1), but to a greater extent at Vellerup and Herslev. Juveniles appeared at all sites during summer and again in the fall but numbers were reduced during late summer. All populations began to reproduce again during fall although to varying degrees. More detailed analyses of seasonal changes in worm size and reproductive mode and how this relates to environmental variables will be presented.

KW - bundfauna

KW - fjord

KW - population biology

M3 - Konferenceabstrakt til konference

ER -

Thonig A, Banta GT, Kesäniemi J, Knott KE, Hansen BW. Population dynamics of the spionid polychaete Pygospio elegans in Isefjord and Roskilde Fjord.. 2015. Abstract fra Dansk Havforskermøde, Copenhagen, Danmark.