10.7 Growth and respiration of the scleractinian cold...
Transcript of 10.7 Growth and respiration of the scleractinian cold...
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Growth and respiration of the scleractinian cold-water coral
Tethocyathus endesa
10.7
Susann Diercks, stud. rer. Nat. (M.Sc.) and Scientific diver Dr. Jürgen Laudien, Dr. Vreni Häussermann and Günther Försterra
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Introduction
M & M
Results / Discussion
Conclusion
Cold-water corals
References
Questions
Also ‘Deep-sea corals‘, occur usually in waters
between 200m and 1500m (Freiwald et al., 2004)
> 50% of the approximately 5100 recent
corals (Roberts et al., 2009)
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Cold-water corals
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are long living
slow growing
fragile, which makes them especially
vulnerable to physical damage
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Cold-water corals
References
Questions
> 70% of CCW live in regions that will be
undersaturated with respect to aragonite by
the end of the century (Maier et al. 2013)
www.scepticalscience.com
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Distribution of cold-water corals
Warm – water corals
Cold – water corals Data: Pörtner et al. 2014, IPCC 2014 Map: Laura Fillinger
References
Questions
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Comau fjord
References
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Tides at Comau fjord
Results
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Comau fjord
High pH
Sampling stations:
Low pH
pH: 7.87 ± 0.06
pH: 7.67 ± 0.05
References
Questions
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Tethocyathus endesa
• Recently discovered (Cairns, Häussermann, Försterra, 2005)
• Solitary scleractinian
• Cold-water coral: ~ 12°C
Upper distribution: ~ 15m Low: not examined yet
References
Questions
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Conclusion Material and Methods
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Cross-transplantation experiment
References
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Control group:
10 corals at high pH location
10 corals at low pH location
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Cross-transplantation experiment
References
Questions
Transplanted corals:
10 corals from high pH –
transplanted to low pH
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Cross-transplantation experiment
References
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Transplanted corals:
10 corals from high pH –
transplanted to low pH
10 corals from low pH –
transplanted to high pH
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Setup
Corals holders at both stations: - 20m depth - 10 corals per coral holder
References
Questions
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Setup
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Buoyant - weighing
wtair = wtwater / (1– (ρwater / ρaragonite ))
Archimedes’ principle – theory
References
Questions
After Davies, 1989
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Respiration rates
• in situ effects of low Seawater pH measured as
in vitro respiration rates.
Increased respiration rates are an indicator for
stress (Telesnicki et al., 1995) !!
References
Questions
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Respiration rates
Manually method:
- Dark incubation
- Magnetic stirrer
- 12h
References
Questions
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Respiration rates
Manually method:
- handheld Luminescent/Optical
Dissolved Oxygen Probe
- + one blank for bacterical
background respiration
References
Questions
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Respiration rates
Automatically method:
- Respiration chambers with flow-through system
- 12h dark – incubation
- Constant data logging
References
Questions
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Conclusion Results and Discussion
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Mass increase
Controls: High pH : 65.11 ± 25.23 mg y-1 (0.03 ± 0.01 %d-1) Low pH : 73.55 ± 26.71 mg y-1 (0.03 ± 0.01 %d-1 )
References
Questions
Low pH
High pH
High pH Low pH
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Mass increase
References
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H
H to L
L
L to H
H H to L
L
L to H
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Mass increase
• Caryophyllia huinayensis (Wurz, 2014): 0.06 ± 0.04 %d-1 • Desmophyllum dianthus (Orejas et al., 2011b):
0.04 ± 0.02 %d-1
• Dendrophyllia cornigera (Orejas et al., 2011b): 0.04 ± 0.02 %d-1
T.endesa in situ longterm mass increase:
0.03 ± 0.01 %d-1 (69.33 ± 25.72 mg y-1 )
Results /
Discussion
References
Questions
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Mass increase
- one of first studies on in situ growth rates of CCW
- No significant difference in growth rates between
cross-transplanted corals of the central part of the
fjord (pH 7.66) and of mouth of the fjord (7.87)
Indication for the adaptability of T.endesa
Results /
Discussion
References
Questions
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Respiration rates
Comparison of manually and automatically method:
comparable values
Δ O2Start – O2End
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Discussion
References
Questions
30
50
70
90
110
Oxy
gen
co
nte
nt
in %
ove
r ti
me
Respiration rates - automatically method
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Respiration rates
Comparison of manually and automatically method:
comparable values
Δ O2Start – O2End
Results /
Discussion
References
Questions Manually method is valid and much easier to implement, especially at field expeditions!
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Respiration rates – T.endesa
Results
/ Discussion
Control groups:
low pH: 7.16 ± 4.23 μMol O2 x cm² x d-1
High pH: 8.05 ± 2.93 μMol O2 x cm² x d-1
Transplants:
High to low pH: 9.88 ± 4.52 μMol O2 x cm² x d-1
References
Questions
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/ Discussion
T.endesa High to low +22%
C.huinayensis High vs. low +144%
Indication for the adaptability of T.endesa
References
Questions
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Tethocyathus endesa, has the potential to colonize habitats:
that are influenced by daily and seasonally
fluctuations
References
Questions
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Conclusion
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Tethocyathus endesa, has the potential to colonize habitats:
that are influenced by daily and seasonally
fluctuations
that are foreseen to undergo more severe changes
in the future
References
Questions
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Results
/ Discussion
T.endesa is capable to maintain its ability of
calcification and stays physiologically potent in
the acidified waters of Chilean fjords.
References
Questions
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Results /
Discussion
Apple Inc. © 2012-2013, Maps Cairns S.D., Häussermann V., Försterra G. (2005) A review of the Scleractinia (Cnidaria: Anthozoa) of Chile, with the description of two new species, Zootaxa, 1018, 15-46 Davis P.S. (1989) Short-term growth measurements of corals using an accurate buoyant weighting technique, Marine Biology, 101, 389-462 Freiwald, A., Fosså, J.H., Grehan, A., Koslow, T., Roberts, J.M. (2004) Cold-water Coral Reefs, UNEP-WCMC, Cambridge, UK IPCC (2014) Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part A: Global and Sectoral Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Field, C.B., V.R. Barros, D.J. Dokken, K.J. Mach, M.D. Mastrandrea, T.E. Bilir, M. Chatterjee, K.L. Ebi, Y.O. Estrada, R.C. Genova, B. Girma, E.S. Kissel, A.N. Levy, S. MacCracken, P.R. Mastrandrea, and L.L. White (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1132 pp. Orejas C., Ferrier-Pagès C., Reynaud S., Gori A., Beraud E., Tsounis G., Allemand D., Gili J.-M. (2011b) Long-term growth rates of four Mediterranean cold-water coral species maintained in aquaria, Marine Ecology Progress Series, 429, 57-65 Telesnicki G. J., Goldberg W. M. (1995) Effects of turbidity on the photosynthesis and respiration of two South Florida reef coral species, Bulletin of Marine Science, 57(2), 527-539 Roberts J.M., Wheeler A.J., Freiwald A., Cairns S. (2009) Cold-water corals – The Biology and Geology of Deep-Sea Coral Habitats, Cambridge University Press, The Edinburgh Building, Cambridge CB2 8RU, United Kingdom Wurz E. (2014) Master-Thesis: Autökologie der Kaltwassersteinkoralle Caryophyllia huinayensis aus der patagonischen Fjordregion, Master Thesis: Universität Rostock, 73 pp.
References
Questions
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Acknowledgements
• Dr. Jürgen Laudien
• Huinay Scientific Field Station • Reserva Anihue
• Fieldtrip Team Patagonia 2014 and 2015
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Questions?
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Respiration rates
Treatment RR [µMol O2 x cm² x d-1]
Manually Automatically
High pH 9.20 ± 2.53 5.712 ± 2.148
High to Low pH 10.57 ± 4.10 6.793 ± 6.799
Low pH 8.23 ± 4.32 5.239 ± 3.666
Low to High pH 7.24 ± 0.74 8.916 ± 1.844
Results /
Discussion
References
Questions
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/ Discussion
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H
H to L
L
L to H
RR
[µ
Mo
l O2
x c
m²
x d
-1]
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/ Discussion
pH RR [µMol O2 x cm² x d-1]
T.endesa 7.87 8.05 ± 2.93
C.huinayensis 7.8 3.69 ± 0.80
T.endesa 7.66 7.16 ± 4.23
C.huinayensis 7.6 7.24 ± 1.74
References
Questions