scholarly journals Drivers of the Abundance of Tridacna spp. Giant Clams in the Red Sea

2021 ◽  
Vol 7 ◽  
Author(s):  
Susann Rossbach ◽  
Andrea Anton ◽  
Carlos M. Duarte
Keyword(s):  
Red Sea ◽  
Large Scale ◽  
Multiple Roles ◽  
Giant Clam ◽  
Carbonate Budget ◽  
Giant Clams ◽  
Tridacna Squamosa ◽  
Tridacna Maxima ◽  
Large Scale Survey ◽  
Reef Zone

Giant clams (Subfamily Tridacninae), are important members of Indo-Pacific coral reefs, playing multiple roles in the framework of these communities. Although they are prominent species in Red Sea reefs, data on their distribution and densities in the region are scarce. The present study provides the first large-scale survey of Red Sea Tridacna spp. densities, where we examined a large proportion of the Saudi Arabian Red Sea coast (1,300 km; from 18° to 29°N). Overall, Tridacninae were found at densities of 0.19 ± 0.43 individuals m–2 (±SD). Out of the total 4,002 observed clams, the majority (89%) were Tridacna maxima, with 0.17 ± 0.37 individuals m–2, while only 11% were Tridacna squamosa clams with 0.02 ± 0.07 individuals m–2. We also report on a few (total 6) Tridacna squamosina specimens, found at a single reef. We identified different geographical parameters (i.e., latitude and distance to shore) and local environmental factors (i.e., depth and reef zone) as the main drivers for local Tridacna spp. densities. Our results show that the drivers influencing the densities of Red Sea giant clams are complex due to their co-occurrence and that this complexity might explain the high variation in Tridacninae abundances across the Indo-Pacific, but also within a given reef. We also estimate that giant clam calcification likely contributes to an average of 0.7%, but potentially up to 9%, of the overall mean calcium carbonate budget of Red Sea coral reef communities.

scholarly journals KEPADATAN DAN KONDISI HABITAT KERANG KIMA (CARDIIDAE: TRIDACNINAE) DI BEBERAPA LOKASI DI PERAIRAN SULAWESI UTARA

2017 ◽  
Vol 3 (2) ◽  
pp. 139
Author(s):  
Ucu Yanu Arbi
Keyword(s):  
Large Scale ◽  
Data Retrieval ◽  
Line Transect ◽  
Giant Clam ◽  
North Sulawesi ◽  
Giant Clams ◽  
Tridacna Squamosa ◽  
Tridacna Maxima ◽  
Tridacna Gigas ◽  
Tridacna Crocea

Kima merupakan salah satu jenis kerang laut yang telah dieksploitasi oleh nelayan Sulawesi Utara dalam skala besar karena memiliki nilai ekonomis yang tinggi. Penelitian ini bertujuan untuk mengetahui kepadatan dan kondisi habitat kerang kima di perairan Sulawesi Utara pada tahun 2007-2009. Daerah penelitian ini meliputi perairan Bitung, Pulau Lembeh, Taman Nasional Bunaken, Likupang, Pulau Talise, Kepulauan Sangihe, dan Kepulauan Talaud. Pengambilan data dilakukandengan metode rapid reef resources inventory dan metode kuadrat transek garis. Ditemukan 1.064 individu kima yang terdiri atas tujuh jenis, yaitu Tridacna crocea, Tridacna squamosa, Tridacna maxima, Tridacna derasa, Tridacna gigas, Hippopus hippopus, dan Hippopus porcelanus. Kepadatan kimasecara keseluruhan di lokasi penelitian rata-rata 0,53 ind./m2. Kepadatan tertinggi adalah jenis Tridacna crocea (rata-rata 0,32 ind./m2), sedangkan terendah adalah jenis Tridacna gigas, Tridacna derasa, dan Hippopus porcelanus (0,01 ind./m2). Giant clam is one of the sea shells that have been exploited by the fisherman of North Sulawesi, a large scale because it has a high economic value. This study aims to determine the distribution and density of giant clams in North Sulawesi waters in 2007-2009. Research conducted in the waters of Bitung, Pulau Lembeh, Bunaken National Park, Likupang, Talise Island, Sangihe Islands, and Talaud Islands. Data retrieval is done by the rapid reef resources inventory method and the quadrat line transect method. 1.064 individual of giant clams was found consisting of seven species, there are Tridacna crocea, Tridacna squamosa, Tridacna maxima, Tridacna derasa, Tridacna gigas, Hippopus hippopus and Hippopus porcelanus. Density of giant clams density is 0,53 ind./m2. The highest density of individuals is Tridacna crocea (0,32 ind./m2), while the lowest is Tridacna gigas, Tridacna derasa and Hippopus porcelanus (0.01 ind./m2).

scholarly journals Light-dependent calcification in Red Sea giant clam <i>Tridacna maxima</i>

2019 ◽  
Vol 16 (13) ◽  
pp. 2635-2650 ◽  
Author(s):  
Susann Rossbach ◽  
Vincent Saderne ◽  
Andrea Anton ◽  
Carlos M. Duarte
Keyword(s):  
Primary Production ◽  
Red Sea ◽  
Gross Primary Production ◽  
Dry Mass ◽  
Giant Clam ◽  
Light Levels ◽  
Unicellular Algae ◽  
Giant Clams ◽  
Intermediate Size ◽  
Tridacna Maxima

Abstract. Tropical giant clams of the subfamily Tridacninae, including the species Tridacna maxima, are unique among bivalves as they live in a symbiotic relationship with unicellular algae and generally function as net photoautotrophs. Light is therefore crucial for these species to thrive. Here we examine the light dependency of calcification rates of T. maxima in the central Red Sea as well as the patterns of its abundance with depth in the field. Red Sea T. maxima show the highest densities at a depth of 3 m with 0.82±0.21 and 0.11±0.03 individuals m−2 (mean ± SE) at sheltered and exposed sites, respectively. Experimental assessment of net calcification (µmol CaCO3 cm−2 h−1) and gross primary production (µmol O2 cm−2 h−1) under seven light levels (1061, 959, 561, 530, 358, 244, and 197 µmol quanta m−2 s−1) showed net calcification rates to be significantly enhanced under light intensities corresponding to a water depth of 4 m (0.65±0.03 µmol CaCO3 cm−2 h−1; mean ± SE), while gross primary production was 2.06±0.24 µmol O2 cm−2 h−1 (mean ± SE). We found a quadratic relationship between net calcification and tissue dry mass (DM in gram), with clams of an intermediate size (about 15 g DM) showing the highest calcification. Our results show that the Red Sea giant clam T. maxima stands out among bivalves as a remarkable calcifier, displaying calcification rates comparable to other tropical photosymbiotic reef organisms such as corals.

scholarly journals Light-dependent calcification in Red Sea giant clam <i>Tridacna maxima</i>

2019 ◽  
Author(s):  
Susann Rossbach ◽  
Vincent Saderne ◽  
Andrea Anton ◽  
Carlos M. Duarte
Keyword(s):  
Primary Production ◽  
Red Sea ◽  
Gross Primary Production ◽  
Dry Mass ◽  
Giant Clam ◽  
Light Levels ◽  
Unicellular Algae ◽  
Giant Clams ◽  
Intermediate Size ◽  
Tridacna Maxima

Abstract. Tropical giant clams of the Tridacninae family, including the species Tridacna maxima, are unique among bivalves as they live in a symbiotic relationship with unicellular algae and generally function as net photoautotrophic. Light is therefore crucial for these species to thrive. Here we examine the light-dependency of calcification rates of T. maxima in the Central Red Sea as well as the patterns of its abundance with depth in the field. Red Sea T. maxima show highest densities in a depth of 3 m with 0.82 ± 0.21 and 0.11 ±  0.03 individuals m−2 (mean ± SE) at sheltered and exposed sites, respectively. Experimental assessment of net calcification (μmol CaCO3 cm−2 h−1) and gross primary production (μmol O2 cm−2 h−1) under seven light levels (1061, 959, 561, 530, 358, 244 and 197 μmol quanta m−2 s−1) showed net calcification rates to be significantly enhanced under light intensities corresponding to a water depth of 4 m (0.65 ± 0.03 μmol CaCO3 cm−2 h−1; mean ± SE), while gross primary production was 2.06 ± 0.24 μmol O2 cm−2 h−1 (mean ± SE). We found a quadratic relationship between net calcification and tissue dry-mass (DM in gram), with clams of an intermediate size (about 15 g DM), showing the highest calcification. Our results show that the Red Sea giant clam T. maxima stands out among bivalves as a remarkable calcifier, displaying calcification rates comparable to other tropical photosymbiotic reef organism, such as corals.

scholarly journals Tissue-Specific Microbiomes of the Red Sea Giant Clam Tridacna maxima Highlight Differential Abundance of Endozoicomonadaceae

2019 ◽  
Vol 10 ◽  
Author(s):  
Susann Rossbach ◽  
Anny Cardenas ◽  
Gabriela Perna ◽  
Carlos M. Duarte ◽  
Christian R. Voolstra
Keyword(s):  
Red Sea ◽  
Giant Clam ◽  
Differential Abundance ◽  
Tissue Specific ◽  
Tridacna Maxima

Survival and growth of juvenile fluted giant clams, Tridacna squamosa, in large-scale grow-out trials in the Solomon Islands

Aquaculture ◽  
1997 ◽  
Vol 148 (2-3) ◽  
pp. 85-104 ◽  
Author(s):  
Timothy P. Foyle ◽  
Johann D. Bell ◽  
Mark Gervis ◽  
Idris Lane
Keyword(s):  
Large Scale ◽  
Solomon Islands ◽  
Giant Clams ◽  
Tridacna Squamosa ◽  
Survival And Growth

scholarly journals Phylogeographic Analysis Suggests a Recent Population Bottleneck in the Rare Red Sea Tridacna squamosina

2021 ◽  
Vol 8 ◽  
Author(s):  
Kah Kheng Lim ◽  
Susann Rossbach ◽  
Nathan R. Geraldi ◽  
Ester A. Serrão ◽  
Carlos M. Duarte
Keyword(s):  
Genetic Diversity ◽  
Red Sea ◽  
Coastal Zone Management ◽  
Small Population ◽  
Zone Management ◽  
Low Genetic Diversity ◽  
Giant Clams ◽  
Management Plans ◽  
Tridacna Maxima ◽  
Distribution And Ecology

Giant clams are an important ecological component of coral reefs in the Red Sea, as they enhance the reef’s productivity and provide habitat that can increase diversity. Three species of giant clams, namely Tridacna maxima, T. squamosa, and T. squamosina have been described within the Red Sea. However, due to its scarcity, information about the distribution and ecology of T. squamosina in the Saudi Arabian Red Sea is still lacking. This study used DNA barcoding to confirm the identity of the rare T. squamosina in the Farasan Banks. Six mtCOI fragments (500 bp) of T. squamosina were successfully amplified using the SQUA-primers for the first time. We used our data along with 18 reference sequences (16S) from the online database to assess the genetic diversity and population structure of T. squamosina. Low genetic diversity among the T. squamosina populations inferred from the 16S sequences implies a recent bottleneck for this species, which is supported by their historically higher diversity based on the coalescent-based estimator. Given the small population abundance and limited genetic variation of T. squamosina, it may warrant immediate local protections such as biobanking and fertility preservation programs as well as effective integrated coastal zone management plans.

scholarly journals Large dendrinids meet giant clam: the bioerosion trace fossil <i>Neodendrina carnelia</i> igen. et isp. n. in a <i>Tridacna</i> shell from Pleistocene–Holocene coral reef deposits, Red Sea, Egypt

Fossil Record ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Max Wisshak ◽  
Christian Neumann
Keyword(s):  
Coral Reef ◽  
Red Sea ◽  
Trace Fossil ◽  
Giant Clam ◽  
Shallow Marine ◽  
Tropical Coral ◽  
Tropical Coral Reef ◽  
Tridacna Maxima ◽  
Large Representative ◽  
Sea Coast

Abstract. The rosette-shaped microboring trace fossil Neodendrina carnelia igen. et isp. n. – a large representative of the ichnofamily Dendrinidae – is identified on the inner side of the giant clam Tridacna maxima from Pleistocene to Holocene coral reef deposits of the El Quseir district at the Egyptian Red Sea coast. The new dendritic bioerosion trace fossil is diagnosed as a radial rosette comprised of a prostrate system of roofless canals that ramify in a strictly dichotomous fashion forming intermittent branches of uniform width and rounded terminations. The trace appears to be rare, although in the type material it occurs in a cluster of more than a hundred specimens. The location of traces on the interior surface of the shell suggests that boring occurred post-mortem to the host. Its record is presently restricted to shallow marine, euphotic, tropical coral reef settings in the Western Indo-Pacific (Red Sea and Madagascar). The biological identity of the trace maker cannot be resolved yet, but several lines of reasoning allow speculations directed towards a complex attachment scar, perhaps produced by a benthic foraminiferan or a macrophyte.

Photosynthetic performance of giant clams, Tridacna maxima and T. squamosa, Red Sea

2008 ◽  
Vol 155 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Carin Jantzen ◽  
Christian Wild ◽  
Mohammed El-Zibdah ◽  
Hilly Ann Roa-Quiaoit ◽  
Christoph Haacke ◽  
...  
Keyword(s):  
Red Sea ◽  
Photosynthetic Performance ◽  
Giant Clams ◽  
Tridacna Maxima

scholarly journals Effects of Symbiodiniaceae Phylotypes in Clades A–E on Progeny Performance of Two Giant Clams (Tridacna squamosa and T. crocea) During Early History Life Stages in the South China Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Chao Long ◽  
Yuehuan Zhang ◽  
Yunqing Li ◽  
Jun Li ◽  
Zihua Zhou ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Giant Clam ◽  
Larval Metamorphosis ◽  
The South ◽  
China Sea ◽  
Giant Clams ◽  
Tridacna Squamosa ◽  
Progeny Performance

Unlike most bivalves, giant clams (tridacnids) harbor symbiotic microalgae (zooxanthellae) in their other fleshy bodies. The effects of mixed populations of zooxanthellae on larval metamorphosis has been reported in several papers, but there have been very few studies on the effects of single zooxanthella species on the establishment of symbiosis in giant clams. In this study, we obtained five pure zooxanthella species (clades A3, B1, C1, D1, E1) from antler coral by molecular identification, and analyzed their effects on the larval metamorphosis and progeny performance of two giant clams, Tridacna squamosa and T. crocea, in the South China Sea. Clam larvae with all five zooxanthella species underwent larval settlement and metamorphosis, and formed the zooxanthellal tubular system. There was some variation in metamorphic rate and time to metamorphosis between clams with different zooxanthella species, but no significant differences in size at metamorphosis. After metamorphosis, larvae with all zooxanthella types continued to develop normally. Mantle color was consistent within clam species and zooxanthella species had no effect on mantle color. However, clam progeny with clade E1 zooxanthellae were smaller than progeny with the other four zooxanthella clades (A3, B1, C1, and D1). Survival rate was over 90% for all progeny and there were no significant differences in survival between progeny with Symbiodinium clades A–E during the entire culture process. Two-way ANOVA analysis revealed that giant clam species was the main factor influencing progeny growth, with some variation in growth attributable to zooxanthella type. Our results provide new information on both the symbiotic relationship between giant clams and zooxanthellae and the mantle coloration of giant clams, and will be useful in giant clam seed production and aquaculture.

Sign in / Sign up

Export Citation Format

Share Document