Ecology

Habitat

Depth range based on 2429 specimens in 10 taxa.
Water temperature and chemistry ranges based on 2400 samples.

Environmental ranges
  Depth range (m): 0 - 47
  Temperature range (°C): 3.032 - 29.241
  Nitrate (umol/L): 0.033 - 23.389
  Salinity (PPS): 33.676 - 36.148
  Oxygen (ml/l): 4.447 - 7.531
  Phosphate (umol/l): 0.063 - 1.722
  Silicate (umol/l): 0.950 - 15.997

Graphical representation

Depth range (m): 0 - 47

Temperature range (°C): 3.032 - 29.241

Nitrate (umol/L): 0.033 - 23.389

Salinity (PPS): 33.676 - 36.148

Oxygen (ml/l): 4.447 - 7.531

Phosphate (umol/l): 0.063 - 1.722

Silicate (umol/l): 0.950 - 15.997
 
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Wikipedia

Tridacninae

Tridacninae, common name, the giant clams, is a taxonomic subfamily of very large saltwater clams, marine bivalve mollusks in the family Cardiidae, the cockles.

Contents

Description

This family contains the largest living bivalve species, including Tridacna gigas, the giant clam. They have heavy shells, fluted with 4–6 folds. The mantle is usually brightly coloured. They inhabit coral reefs in warm seas in the Indo-Pacific region. Most of these clams live in symbiosis with photosynthetic dinoflagellates (zooxanthellae).

Systematics

Sometimes the giant clams are still treated as a separate family Tridacnidae,[1] but modern phylogenetic analyses included them in the family Cardiidae as a subfamily.[2][3] Two recent genera and eight species are known:

Recent genetic evidence has shown them to be monophyletic sister taxa.[4]

Human relevance

In some areas, such as the Philippines, smaller members of the family are farmed to supply the marine aquarium trade.

References

  1. ^ WoRMS. (2009). Tridacnidae. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=196336 on 2009-01-10.
  2. ^ Schneider,J. Phylogeny of cardiid bivalves (cockles and giant clams): revision of the Cardiinae and the importance of fossils in explaining disjunct biogeographical distributions. Zoological Journal of the Linnean Society, 2002,136, 321–369
  3. ^ Keys,J.L., Helay,J.M. Relevance of Sperm Ultrastructure to the Classification of Giant Clams (Mollusca, Cardioidea, Cardiidae, Tridacninae)(in: Harper et al., (Eds) The Evolutionary Biology of the Bivalvia, Geological Society Special Publication No 177, 2000)
  4. ^ Schneider, J.A.,and O´Foighil, D. Phylogeny of Giant Clams (Cardiidae: Tridacninae) Based on Partial Mitochondrial 16S rDNA Gene Sequences. Molecular Phylogenetics and Evolution Vol. 13, No. 1, October, pp. 59–66, 1999
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