The defensive role of scutes in juvenile fluted giant clams (Tridacna squamosa)

Han, Ling; Todd, Peter A.; Chou, Loke Ming; Bing, Yap Von; Sivaloganathan, B.

doi:10.1016/j.jembe.2008.02.021

Cited by 23 publications

(10 citation statements)

References 40 publications

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“…Previous studies state that T. maxima varies greatly in color, usually has 4-5 ribs with round projections on the upper margins of its shell, and more commonly inhabits shallow reef tops (Jantzen et al 2008;Su et al 2014). Tridacna squamosa, commonly known as the fluted clam, has exaggerated scutes that open outward and individual clams are found deeper on the reef (Jantzen et al 2008;Chan et al 2008;Han et al 2008). Following genetic identification of the species, our in-situ photographs of T. squamosa ( Fig.…”

Section: Discussionmentioning

confidence: 98%

Genetic diversity of giant clams (Tridacna spp.) and their associated Symbiodinium in the central Red Sea

Pappas

Hardenstine

et al. 2017

Mar Biodiv

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Section: Discussionmentioning

confidence: 98%

Genetic diversity of giant clams (Tridacna spp.) and their associated Symbiodinium in the central Red Sea

Pappas

Hardenstine

et al. 2017

Mar Biodiv

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“…Other examples without a phylogenetic framework hypothesizing that ornamentation evolved through adaptation to drilling predation include work on Paleozoic brachiopods (Leighton 2001(Leighton , 2003. Adaptation against durophagous predators through ornamentation on bivalves was suggested by Dietl et al (2000) and Han et al (2008), but only the former made use of a phylogenetic framework (i.e., "lineages").…”

Section: Discussionmentioning

confidence: 99%

Shell ornamentation as a likely exaptation: evidence from predatory drilling on Cenozoic bivalves

Klompmaker¹,

Kelley²

2015

Paleobiology

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Abstract.-Predation is an important process in modern oceans and in the evolutionary history of marine ecosystems. Consequently, it has been hypothesized that shelled prey modified their ornamentation in response to predation. However, bivalve ornamentation has also been argued to be important in maintaining a stable life position in the sediment and in burrowing. To test whether concentric ribs were effective against drilling by carnivorous gastropods, we examined drill hole position and completeness for four Cenozoic bivalve species that differ in rib strength (Astarte radiata, A. goldfussi, Lirophora glyptocyma, and L. latilirata). The percentage of drill holes located between the ribs increases with increasing rib strength, whereas the percentage of drill holes on top of ribs decreases. This result suggests that gastropods select the drill hole site more effectively as rib strength increases, thereby saving time and energy, and that natural selection favors gastropods that select drill hole sites between ribs. Because of this greater stereotypy, the percentage of drill holes that are incomplete is generally lower in strongly ribbed species. The proportion of drill holes located on top of ribs is greater for incomplete than complete holes, implying that ribs can be effective against predators, but only when selected as the drilling location. We show that ribs are most effective against drilling predation for bivalves with moderately sized ribs, between which gastropods have difficulty siting drill holes. Concentric ribs are unlikely to have evolved as an adaptation against drilling predation because concentric ribs evolved in the Paleozoic and were already common in the Mesozoic, whereas drilling frequency increased later, in the Late Cretaceous-Paleogene. Moreover, rib strength of North American Astarte did not change through this time interval. Thus, the ribs considered here are a likely exaptation to drilling given their effectiveness at deterring drilling predation on bivalves with moderate ribs.

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“…The survival rate of the clams in the conventional methods was lower, and it was observed that their outer casings were thinner and blacker (and then later whiter) and they inhabited sediment with higher sulphide levels. Some studies also indicated that the shape of the outer casing of clams is strongly associated with the physiological conditions used to assess organism health (Lin, Meyers & Vecchio ; Han, Todd, Chou, Bing & Sivaloganathan ; Aoki, Ishikawa, Fujiwara, Atsumi, Nishikawa, Okamoto & Komaru ; Lewbart, Christian, Harms & Van Wettere ), that is the stronger the casing, the more resistant to injury and disease for the clam. Therefore, we summarized the appropriate farming environmental factors for clams were suggested by the present study as follows.…”

Section: Discussionmentioning

confidence: 99%

A study of the growth and burrowing ability for the environmentally friendly cultured freshwater clamCorbicula fluminea

Chang

Shih

et al. 2016

Aquac Res

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Issues concerning ecology, food safety and environmental protection are currently the focus of global attention, as are studies related to regionspecific agriculture that emphasize regional quality. Hualien County, located in eastern Taiwan, proposed the so-called innocuous agriculture is that the industries can product non-toxic products, including agriculture, fisheries, animal husbandry and processed industries. Innocuous agriculture and organic agriculture share the same objective, producing non-toxic and pollutant-free agricultural products. The biodiversity associated with organic farming is greater than that associated with conventional farming, and these results have been confirmed by several studies, triggering the present research on the benefits of innocuous aquaculture over those of conventional aquaculture farming. The purpose of this study was to compare the growth, aquaculture outlet wastewater and burrowing ability of clams (Corbicula fluminea) cultured by an innocuous aquaculture method and two conventional aquaculture methods. The results indicated that the clams cultured by the innocuous aquaculture method grew faster and were healthier than those cultured by the two conventional methods. The innocuous method, which approaches the organic method, is environmentally friendly and produces more vigorous individuals than those of conventional methods.

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The defensive role of scutes in juvenile fluted giant clams (Tridacna squamosa)

Cited by 23 publications

References 40 publications

Genetic diversity of giant clams (Tridacna spp.) and their associated Symbiodinium in the central Red Sea

Genetic diversity of giant clams (Tridacna spp.) and their associated Symbiodinium in the central Red Sea

Shell ornamentation as a likely exaptation: evidence from predatory drilling on Cenozoic bivalves

A study of the growth and burrowing ability for the environmentally friendly cultured freshwater clamCorbicula fluminea

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