Environmental geochemistry and mineralogy of molluscan shells as related to their ecology
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ORIGINAL PAPER
Environmental geochemistry and mineralogy of molluscan shells as related to their ecology W. R. Alharbi 1 & Atef El-Taher 2
Received: 13 February 2017 / Accepted: 2 November 2017 / Published online: 15 December 2017 # Saudi Society for Geosciences 2017
Abstract Several samples of gastropod and pelecypod mollusk shells from three localities are selected along the Egyptian Red Sea coast. This is a study of the wall structure of some different shells of gastropods and pelecypod mollusks and their adaptive significance on evolution of the physical and chemical properties of the Red Sea water prevailing along the Egyptian shores and coasts. Analysis of gastropod and pelecypod mollusk shells of the study areas provides investigators with data to characterize the composition of these gastropod and pelecypod mollusk shells and to know the degree of human activities influence on the composition of the gastropod and pelecypod mollusk shells. Lambis truncata at Quseir and Safaga Harbors recorded the highest carbonate percentages (98.0 and 98.4%); meanwhile, Tridacna gigas at Quseir and Safaga Harbors recorded the highest organic matter contents (2.0 and 1.9%). On the other hand, Tridacna gigas recorded the highest values of organic matter in the study areas compared with the other species. The highest Ca contents were observed in Tridacna gigas and Strombus tricornis (71.1 and 69.6%) at El-Esh area, also the highest Mg was in Tridacna gigas (2.0%) at Qusier and Safaga Harbors, while the highest Sr was in Strombus tricornis at Qseir Harbor and El-Esh area (2473 and 2335 ppm). A study of the geochemistry, X-ray diffraction contents of the common gastropod and pelecypod mollusk shells from Quseir Harebour, Safaga
* W. R. Alharbi [email protected]
1
Present address: Physics Department, Faculty Science, King Abdulaziz University, Jeddah, Saudi Arabia
2
Physics Department, Faculty of Science, Al Azhar University Assiut Branch, Assiut, Egypt
Harbor, and El-Esh area along the Egyptian Red Sea coast was carried out. Keywords Shells . Geochemistry . X-ray diffractions . Ecology . Red Sea . Egypt
Introduction The Red Sea is a semi-closed basin at the extreme end of the Indo-Pacific province; it is expected to contain some species which are quite different from closely related species in nearly seas. These include forms which are particularly living and flourishing in warm, shallow water, carbonate environments with higher salinities. The Red Sea stretch represents an ideal carbonate environment in which biostromes, carbonate sands with vegetation and reefs predominate. Recent invertebrates mainly are benthic foraminifera, coral reefs, and Mollusca which are considered to be most important for this integrated approach. Recent invertebrates and protists, especially Mollusca and benthic foraminifera, serve as excellent indicators of the water temperature in the past and present environments (Madkour 2015). Mollusca is the second largest phylum of invertebrates in the animal kingdom, comprising about 100,000 spec
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