In situ giant clam growth rate behavior in relation to temperature : a one-year coupled study of high-frequency noninvasive valvometry and sclerochronology

Caroline Schwartzmann 1, 2 Gilles Durrieu 3 Mohamedou Sow 1 Pierre Ciret 1 Claire E. Lazareth 2 Jean-Charles Massabuau 1, *
* Corresponding author
1 EPOC - Environnements et Paléoenvironnements OCéaniques
2 LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
3 LMBA - Laboratoire de Mathématiques de Bretagne Atlantique
Abstract : The life history of 15 giant clams, Hippopus hippopus, was studied in situ in the southern lagoon of New Caledonia; growth rate and animal behavior were studied both by sclerochronology and high-frequency noninvasive (HFNI) valvometry. Electrodes glued on each valve of each specimen recorded the shell-gaping behavior at 0.6-Hz frequency. A nonparametric regression model was used to model clam behavior. The daily increment thickness in the inner layer of five representative clams was measured. H. hippopus has its valves open during the day and partly closed during the night all year round, and shell growth is continuous. The cumulative growth using both techniques was similar, as was the mean daily thickness increment. The occurrence of one increment per day in H. hippopus shell was measured by valvometry. The five sclerochronological profiles were highly similar. Shell growth was significantly correlated to rising sea surface temperature (SST), up to 27 degrees C. At the solar maximum, gaping behavior and increment thickness became erratic. SST- and solar irradiance-related stress could be related to physiological oxidative stress triggered by zooxanthellae symbionts. In the present context of globally increasing SST, our data indicate that the giant clams H. hippopus could live beyond their thermal comfort limits in summer in New Caledonia.
Document type :
Journal articles
Complete list of metadatas

Cited literature [28 references]  Display  Hide  Download
https://hal.ird.fr/ird-01097945
Contributor : Claire E. Lazareth <>
Submitted on : Monday, December 22, 2014 - 2:45:57 PM
Last modification on : Monday, June 17, 2019 - 12:16:02 PM
Long-term archiving on : Monday, March 23, 2015 - 7:31:01 PM

File

Schwartzmann-Hhippopus-growth-...
Publisher files allowed on an open archive

Identifiers

Collections

IRD | LOCEAN | INSU | EPHE | UPMC | INSMI | UNIV-BREST | PSL | LMBA_UBS | IBNM | SORBONNE-UNIVERSITE | MNHN | SU-SCIENCES

Citation

Caroline Schwartzmann, Gilles Durrieu, Mohamedou Sow, Pierre Ciret, Claire E. Lazareth, et al.. In situ giant clam growth rate behavior in relation to temperature : a one-year coupled study of high-frequency noninvasive valvometry and sclerochronology. Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2011, 56 (5), pp.1940-1951. ⟨10.4319/lo.2011.56.5.1940⟩. ⟨ird-01097945⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

620

Files downloads

504

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD