The Effect of Variation in Developmental Mode on the Population Dynamics of a Spionid Polychaete (Pygospio elegans) in a Heterogeneous Environment

Anne Thonig

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

Resumé

The effect of variation in developmental mode on the population dynamics of a
spionid polychaete (Pygospio elegans) in a heterogeneous environment.
Yhteenveto: Kehitysmuotojen variaatio ja sen vaikutus Pygospio elegans -
monisukasmadon populaatiodynamiikkaan heterogeenisessä ympäristössä.
Oversigt: Effekten af variation I developmental mode på populationsdynamikken
af en spionid børsteorm (Pygospio elegans) i et heterogent miljø.
There is a great diversity in larvae of marine invertebrates. To understand the
causes and consequences of different modes of development on population
dynamics, study of poecilogonous species that show a polymorphism in
developmental mode might be more useful than are comparisons between
species, since no confounding effects due to speciation arise. In this study, I
documented the population ecology and genetics of the poecilogonous
polychaete P. elegans and investigated the impact of abiotic and biotic variables
on population dynamics. Four focal populations from the Isefjord-RoskildeFjord
estuary complex, Denmark were sampled over one year. I observed
highly dynamic population structure in both size cohort data and population
genetic data that is possibly explained by the short life span of P. elegans and
sweepstakes reproductive success. Additionally, stochastic events, such as rain
storms, can lead to abrupt drops in salinity which can be detrimental for P.
elegans and hence introduce further changes in population structure. Seasonal
dynamics, including sexual reproduction, were correlated with temperature,
whereas spatial differences in density, size and reproductive activity of P.
elegans as well as species diversity of the benthic invertebrate community, were
related to sediment structure. A positive correlation between species and allelic
richness of P. elegans might indicate that environmental impacts are of greater
importance in shaping population dynamics than are species interactions.
Switches in developmental mode could reflect a strategy for coping with life in
an unpredictable, heterogeneous habitat. Although switches in developmental
mode were correlated with the appearance of genetically differentiated size
cohorts, environmental or epigenetic effects cannot be ruled out.
OriginalsprogEngelsk
Udgivelses stedRoskilde
ForlagRoskilde Universitet
Antal sider72
StatusUdgivet - 12 jan. 2018

Emneord

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    title = "The Effect of Variation in Developmental Mode on the Population Dynamics of a Spionid Polychaete (Pygospio elegans) in a Heterogeneous Environment",
    abstract = "The effect of variation in developmental mode on the population dynamics of aspionid polychaete (Pygospio elegans) in a heterogeneous environment.Yhteenveto: Kehitysmuotojen variaatio ja sen vaikutus Pygospio elegans -monisukasmadon populaatiodynamiikkaan heterogeenisess{\"a} ymp{\"a}rist{\"o}ss{\"a}.Oversigt: Effekten af variation I developmental mode p{\aa} populationsdynamikkenaf en spionid b{\o}rsteorm (Pygospio elegans) i et heterogent milj{\o}.There is a great diversity in larvae of marine invertebrates. To understand thecauses and consequences of different modes of development on populationdynamics, study of poecilogonous species that show a polymorphism indevelopmental mode might be more useful than are comparisons betweenspecies, since no confounding effects due to speciation arise. In this study, Idocumented the population ecology and genetics of the poecilogonouspolychaete P. elegans and investigated the impact of abiotic and biotic variableson population dynamics. Four focal populations from the Isefjord-RoskildeFjordestuary complex, Denmark were sampled over one year. I observedhighly dynamic population structure in both size cohort data and populationgenetic data that is possibly explained by the short life span of P. elegans andsweepstakes reproductive success. Additionally, stochastic events, such as rainstorms, can lead to abrupt drops in salinity which can be detrimental for P.elegans and hence introduce further changes in population structure. Seasonaldynamics, including sexual reproduction, were correlated with temperature,whereas spatial differences in density, size and reproductive activity of P.elegans as well as species diversity of the benthic invertebrate community, wererelated to sediment structure. A positive correlation between species and allelicrichness of P. elegans might indicate that environmental impacts are of greaterimportance in shaping population dynamics than are species interactions.Switches in developmental mode could reflect a strategy for coping with life inan unpredictable, heterogeneous habitat. Although switches in developmentalmode were correlated with the appearance of genetically differentiated sizecohorts, environmental or epigenetic effects cannot be ruled out.",
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    The Effect of Variation in Developmental Mode on the Population Dynamics of a Spionid Polychaete (Pygospio elegans) in a Heterogeneous Environment. / Thonig, Anne.

    Roskilde : Roskilde Universitet, 2018. 72 s.

    Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

    TY - BOOK

    T1 - The Effect of Variation in Developmental Mode on the Population Dynamics of a Spionid Polychaete (Pygospio elegans) in a Heterogeneous Environment

    AU - Thonig, Anne

    PY - 2018/1/12

    Y1 - 2018/1/12

    N2 - The effect of variation in developmental mode on the population dynamics of aspionid polychaete (Pygospio elegans) in a heterogeneous environment.Yhteenveto: Kehitysmuotojen variaatio ja sen vaikutus Pygospio elegans -monisukasmadon populaatiodynamiikkaan heterogeenisessä ympäristössä.Oversigt: Effekten af variation I developmental mode på populationsdynamikkenaf en spionid børsteorm (Pygospio elegans) i et heterogent miljø.There is a great diversity in larvae of marine invertebrates. To understand thecauses and consequences of different modes of development on populationdynamics, study of poecilogonous species that show a polymorphism indevelopmental mode might be more useful than are comparisons betweenspecies, since no confounding effects due to speciation arise. In this study, Idocumented the population ecology and genetics of the poecilogonouspolychaete P. elegans and investigated the impact of abiotic and biotic variableson population dynamics. Four focal populations from the Isefjord-RoskildeFjordestuary complex, Denmark were sampled over one year. I observedhighly dynamic population structure in both size cohort data and populationgenetic data that is possibly explained by the short life span of P. elegans andsweepstakes reproductive success. Additionally, stochastic events, such as rainstorms, can lead to abrupt drops in salinity which can be detrimental for P.elegans and hence introduce further changes in population structure. Seasonaldynamics, including sexual reproduction, were correlated with temperature,whereas spatial differences in density, size and reproductive activity of P.elegans as well as species diversity of the benthic invertebrate community, wererelated to sediment structure. A positive correlation between species and allelicrichness of P. elegans might indicate that environmental impacts are of greaterimportance in shaping population dynamics than are species interactions.Switches in developmental mode could reflect a strategy for coping with life inan unpredictable, heterogeneous habitat. Although switches in developmentalmode were correlated with the appearance of genetically differentiated sizecohorts, environmental or epigenetic effects cannot be ruled out.

    AB - The effect of variation in developmental mode on the population dynamics of aspionid polychaete (Pygospio elegans) in a heterogeneous environment.Yhteenveto: Kehitysmuotojen variaatio ja sen vaikutus Pygospio elegans -monisukasmadon populaatiodynamiikkaan heterogeenisessä ympäristössä.Oversigt: Effekten af variation I developmental mode på populationsdynamikkenaf en spionid børsteorm (Pygospio elegans) i et heterogent miljø.There is a great diversity in larvae of marine invertebrates. To understand thecauses and consequences of different modes of development on populationdynamics, study of poecilogonous species that show a polymorphism indevelopmental mode might be more useful than are comparisons betweenspecies, since no confounding effects due to speciation arise. In this study, Idocumented the population ecology and genetics of the poecilogonouspolychaete P. elegans and investigated the impact of abiotic and biotic variableson population dynamics. Four focal populations from the Isefjord-RoskildeFjordestuary complex, Denmark were sampled over one year. I observedhighly dynamic population structure in both size cohort data and populationgenetic data that is possibly explained by the short life span of P. elegans andsweepstakes reproductive success. Additionally, stochastic events, such as rainstorms, can lead to abrupt drops in salinity which can be detrimental for P.elegans and hence introduce further changes in population structure. Seasonaldynamics, including sexual reproduction, were correlated with temperature,whereas spatial differences in density, size and reproductive activity of P.elegans as well as species diversity of the benthic invertebrate community, wererelated to sediment structure. A positive correlation between species and allelicrichness of P. elegans might indicate that environmental impacts are of greaterimportance in shaping population dynamics than are species interactions.Switches in developmental mode could reflect a strategy for coping with life inan unpredictable, heterogeneous habitat. Although switches in developmentalmode were correlated with the appearance of genetically differentiated sizecohorts, environmental or epigenetic effects cannot be ruled out.

    KW - Benthic invertebrates

    KW - Isefjord-Roskilde-Fjord

    KW - Pygospio elegans

    KW - population ecology and genetics

    KW - poecilogony

    KW - life history

    KW - estuary complex

    M3 - Ph.D. thesis

    BT - The Effect of Variation in Developmental Mode on the Population Dynamics of a Spionid Polychaete (Pygospio elegans) in a Heterogeneous Environment

    PB - Roskilde Universitet

    CY - Roskilde

    ER -