Al-Janabi, Balsam

Graiff, A.

Karsten, U.

Kruse, Inken

Wahl, Martin

OceanRep

B. Al-Janabi 1, A. Graiff 2, U. Karsten 2, I. Kruse 1, M. Wahl 1  1 GEOMAR, Kiel, Germany, 2 University of Rostock, Rostock, Germany GEOMAR Helmholtz Centre for Ocean Research Kiel – www.geomar.de – BIOACID Phase II Meeting Kiel 10 – 11 Sept. 2014 Does genetic diversity of F. vesiculosus germlings confer resistance towards climate change stress? Consortium 2:  Responses of benthic assemblages to interactive stress WP 2.5:         Interaction between intraspecific genetic diversity and environmental stress in early       life-stage macroalgae Contact: Balsam Al-Janabi (baljanabi@geomar.de)  Conclusions Future climate change is simulated at the Kiel Benthocosm  T: 5° pCO2: 600 µatm C Climate change factors are overlain as a delta-treatment onto naturally fluctuating regimes.  A Fucus vesiculosus community is exposed to different conditions. Temperature and pCO2 increase  simulate the climate change predicted for 2100. Eutrophication increases survival of Fucus germlings While a heat wave lead to low survival of germlings, mortality was alleviated in presence of higher nutrient concentrations (p-value < 0,05). Groups with higher genetic diversity presented higher survival than those of lower levels.  020406080100T+ CO2+ NS - T+ CO2+ NS+ T- CO2- NS- T- CO2- NS+Survival % 123low medium high Diversity level Climate change effects on seaweed germlings‘ growth depends on season Higher temperature regimes enhance growth rate in spring and autumn, but lead to a high mortality during summer.  The fertilisation effect caused by high pCO2 is observed only during summer.  -20020406080100120Growth rate (% day-1) T+ CO2+T+ CO2-T- CO2+T- CO2-Means and standard deviations Spring Early summer Summer Late summer Autumn 200 µM 200 µM Cohorte 1 Cohorte 2 No effect Temp * Temp x CO2* Temp * Temp * Temp * CO2 *               00,20,40,60,81T+ CO2 + T+ CO2 - T- CO2 + T- CO2-1:Y (NPQ)1:Y (NO)1:Y (II)Y(NPQ)  (    Y(PSII) Germlings‘ photosynthetic parameters are influenced at higher temperatures The high effective quantum yield (Fv‘/Fm‘) at elevated temperature regimes indicates a better health condition for Fucus germlings in spring (p-value < 0,05). Proportion: Energy Dissipation • The temperature effect is favourable in spring and autumn but harmful during summer.       High nutrient level alleviates mortality during the summer heat wave.  • Ocean acidification increases growth during summer due to a fertilisation effect.  • Survival is increased for groups with a high genetic diversity. • For detecting genotypes selected in diverse populations, microsattelite markers are applied. Genetic diversity confers potential for adaptation and is crucial for the conservation in a changing ocean. To explore the significance of genetic diversity during early life, when highest selection occurs, we exposed Fucus vesiculosus germlings to increased temperature, pCO2 and nutrients. We hypothesize that diverse genotypes react differently on climate change factors. Performance of the germlings (photosynthetic efficiency &  growth) and survival are measured coninuously. Are Fucus germlings with high genetic diversity doing better under climate change scenarios? Three diversity levels settled on limestones Low diversity level                   Single siblings 1   2   3   4 Medium diversity level                 Quartets = 4 sibs High diversity level                  Octets     = 8 sibs versus versus 1         2         3        4         5        6         7        8          9        10      11       12      13       14      15      16 5   6   7   8 9   10   11  12 13  14  15  16 1   2   3   4   5   6   7   8 9  10  11  12  13  14  15  16 Foto: B. Al-Janabi © Inken Kruse 500 µM Foto: B. Al-Janabi Mean and ±SD  n = 3 

Does genetic diversity of F. vesiculosusgermlings confer resistance towards climate change stress?

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