N. Yasuda, K. Kajiwara, S. Nagai, Kota Ikehara, K. Nadaoka
To date, field sampling and identification of the larvae of the coral-eating starfish Acanthaster planci have not been successfully performed (Birkeland 1990). We collected water samples (500 L) from 5 different depths (surface, 3 m, 7 m, 11 m, 15 m, and near the bottom) to find A. planci larvae on June 29, 2005, during the spawning period (Yasuda et al. 2010). The samples were obtained from Yabiji Reef, off Miyako Island, Okinawa, Japan (25°1′13.85′′N, 125°14′49.20′′E, Fig. 1A), where a population outbreak of A. planci was observed (Fig. 1B). We used a stereoscopic microscope to find and isolate 26 possible starfish larvae (gastrula and bipinnaria stages; Fig. 1C and D, respectively) from the samples, which were preserved in ethanol (>70%). We extracted DNA using the DNeasy blood & tissue kit (Qiagen), and directly sequenced partial mitochondrial DNA fragments amplified by using a previously published COI primer pair (Vogler et al. 2008) and a putative control region primer pair (Timmers et al. 2011). The latter primer pair can discriminate A. planci from some common sea stars such as Protoreaster nodosus, Linckia laevigata, and Culcita novaeguineae. The following PCR conditions were used: denaturing step at 94°C for 3 min, followed by 35 cycles of 94°C for 20 s, 60°C for 30 s, and 72°C for 30 s with a final extension step at 72°C for 5 min. The PCR cocktail contained 3.84 μL of ddH2O, 5 μL of KAPATaq Extra HotStart ReadyMix (Kapa Biosystems), 1 μL of template DNA, and 0.07 μL of 50 mM primers. Only 10 larvae were successfully analyzed, partly due to degradation of DNA, but all were identified as A. planci by BLAST search. Nine larvae at the gastrula stage were found in either the surface (2), 7 m (5), or near bottom (2) samples, while 1 larva at the bipinnaria stage was found in the surface sample. Salinity-Temperature-Depth (STD) data showed that the water temperature was 27.7-27.9°C and chlorophyll a concentration was 0.3-0.4 μg/L at the sampling points from where we identified larvae of A. planci. Since the minimum threshold density of chlorophyll a for successful development is 0.4 μg/L (Fabricius et al. 2010), the larvae might have had access to limited food during the study period. First report of field sampling and identification of crown-of-thorns starfish larvae
{"title":"First report of field sampling and identification of crown-of-thorns starfish larvae","authors":"N. Yasuda, K. Kajiwara, S. Nagai, Kota Ikehara, K. Nadaoka","doi":"10.3755/GALAXEA.17.15","DOIUrl":"https://doi.org/10.3755/GALAXEA.17.15","url":null,"abstract":"To date, field sampling and identification of the larvae of the coral-eating starfish Acanthaster planci have not been successfully performed (Birkeland 1990). We collected water samples (500 L) from 5 different depths (surface, 3 m, 7 m, 11 m, 15 m, and near the bottom) to find A. planci larvae on June 29, 2005, during the spawning period (Yasuda et al. 2010). The samples were obtained from Yabiji Reef, off Miyako Island, Okinawa, Japan (25°1′13.85′′N, 125°14′49.20′′E, Fig. 1A), where a population outbreak of A. planci was observed (Fig. 1B). We used a stereoscopic microscope to find and isolate 26 possible starfish larvae (gastrula and bipinnaria stages; Fig. 1C and D, respectively) from the samples, which were preserved in ethanol (>70%). We extracted DNA using the DNeasy blood & tissue kit (Qiagen), and directly sequenced partial mitochondrial DNA fragments amplified by using a previously published COI primer pair (Vogler et al. 2008) and a putative control region primer pair (Timmers et al. 2011). The latter primer pair can discriminate A. planci from some common sea stars such as Protoreaster nodosus, Linckia laevigata, and Culcita novaeguineae. The following PCR conditions were used: denaturing step at 94°C for 3 min, followed by 35 cycles of 94°C for 20 s, 60°C for 30 s, and 72°C for 30 s with a final extension step at 72°C for 5 min. The PCR cocktail contained 3.84 μL of ddH2O, 5 μL of KAPATaq Extra HotStart ReadyMix (Kapa Biosystems), 1 μL of template DNA, and 0.07 μL of 50 mM primers. Only 10 larvae were successfully analyzed, partly due to degradation of DNA, but all were identified as A. planci by BLAST search. Nine larvae at the gastrula stage were found in either the surface (2), 7 m (5), or near bottom (2) samples, while 1 larva at the bipinnaria stage was found in the surface sample. Salinity-Temperature-Depth (STD) data showed that the water temperature was 27.7-27.9°C and chlorophyll a concentration was 0.3-0.4 μg/L at the sampling points from where we identified larvae of A. planci. Since the minimum threshold density of chlorophyll a for successful development is 0.4 μg/L (Fabricius et al. 2010), the larvae might have had access to limited food during the study period. First report of field sampling and identification of crown-of-thorns starfish larvae","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132676576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The concentrations of dissolved cadmium (Cd) were monitored in the surface water of Urasoko Bay and the mouth of the stream that runs into the bay. Urasoko Bay is located on the northern coast of Ishigaki Island, Okinawa, which is surrounded by a fringing reef. Water samplings were carried out from August 2006 to August 2007, and adding to these samplings, freshwater from the upper stream and brackish water that exudates at the beach site were collected from April to June 2007. The concentration of dissolved Cd showed no tendency to decrease from the upper stream to the bay site. The results of Cd behaved non-conservatively in the Cd-salinity plot, which was attributed to daily variations in the Cd concentrations of upper stream water and the irregular input of Cd possibly adsorbed particles into the stream and beach water (the mixture of groundwater and seawater before exudation on the beach).
{"title":"Behavior of dissolved cadmium in surface water of Urasoko Bay, Ishigaki Island, Japan","authors":"K. Abe","doi":"10.3755/GALAXEA.10.77","DOIUrl":"https://doi.org/10.3755/GALAXEA.10.77","url":null,"abstract":"The concentrations of dissolved cadmium (Cd) were monitored in the surface water of Urasoko Bay and the mouth of the stream that runs into the bay. Urasoko Bay is located on the northern coast of Ishigaki Island, Okinawa, which is surrounded by a fringing reef. Water samplings were carried out from August 2006 to August 2007, and adding to these samplings, freshwater from the upper stream and brackish water that exudates at the beach site were collected from April to June 2007. The concentration of dissolved Cd showed no tendency to decrease from the upper stream to the bay site. The results of Cd behaved non-conservatively in the Cd-salinity plot, which was attributed to daily variations in the Cd concentrations of upper stream water and the irregular input of Cd possibly adsorbed particles into the stream and beach water (the mixture of groundwater and seawater before exudation on the beach).","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133639469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cleaner fishes remove ectoparasites, mucus and dead tissues from other ‘client’ organisms. These mutu alistic interactions provide benefits for the ‘clients’ and, on a larger scale, maintain healthy reef ecosystems. Here, we report two species of angelfishes, Centropyge bicolor and C. tibicen, acting as cleaners of the blue tang Paracanthurus hepatus in an aquarium. This observation is the first time that pygmy angelfishes are recorded cleaning in any en vironment. This novel cleaning ob servation raises ques tions on the ecosystem role of cleaner fishes and which biological traits facilitate cleaning.
{"title":"Filling an empty role: first report of cleaning by pygmy angelfishes (Centropyge, Pomacanthidae)","authors":"P. Narvaez, R. Morais","doi":"10.3755/galaxea.22.1_31","DOIUrl":"https://doi.org/10.3755/galaxea.22.1_31","url":null,"abstract":"Cleaner fishes remove ectoparasites, mucus and dead tissues from other ‘client’ organisms. These mutu alistic interactions provide benefits for the ‘clients’ and, on a larger scale, maintain healthy reef ecosystems. Here, we report two species of angelfishes, Centropyge bicolor and C. tibicen, acting as cleaners of the blue tang Paracanthurus hepatus in an aquarium. This observation is the first time that pygmy angelfishes are recorded cleaning in any en vironment. This novel cleaning ob servation raises ques tions on the ecosystem role of cleaner fishes and which biological traits facilitate cleaning.","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"217 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130724738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Overharvesting of herbivorous fishes is assumed to be one of the causes for phase shift on coral reefs from coralto macroalgal-dominated communities by reducing inhibitor of algal growth. In order to reveal the effect of herbivorous fishes on algae and juvenile acroporid corals, field experiment was conducted in Okinawa, southern Japan. Grazer-exclusion cages were established where small (≈2 cm in length) coral branchlets of Acropora tenuis were transplanted both inside and outside the cages. During the exclusion experiment, algal biomass, survival and growth of the transplanted corals were monitored. The cages effectively excluded herbivorous fishes that resulted in significantly greater algal biomass inside the cages than outside. While algal biomass continued to increase within the cages, algal species composition has changed drastically at the middle of the experimental period. During the first half period (3 months) when encrusting turf algae covered substrate adjacent to coral branchlets inside the cages, coral branchlets could not expand their attachment area on the substrata. In contrast, during the second half period (3 months) corals started rapid growth after turf algae disappeared and frondose macroalgae dominated. We conclude that turf algae may prevent the growth of juvenile acroporid corals especially in the early stages of horizontal expansion prior to the vertical growth.
{"title":"Space competition between coral and algae — effect of two functional groups of algae on juvenile Acropora corals","authors":"Rei Tamai, K. Sakai","doi":"10.3755/GALAXEA.15.115","DOIUrl":"https://doi.org/10.3755/GALAXEA.15.115","url":null,"abstract":"Overharvesting of herbivorous fishes is assumed to be one of the causes for phase shift on coral reefs from coralto macroalgal-dominated communities by reducing inhibitor of algal growth. In order to reveal the effect of herbivorous fishes on algae and juvenile acroporid corals, field experiment was conducted in Okinawa, southern Japan. Grazer-exclusion cages were established where small (≈2 cm in length) coral branchlets of Acropora tenuis were transplanted both inside and outside the cages. During the exclusion experiment, algal biomass, survival and growth of the transplanted corals were monitored. The cages effectively excluded herbivorous fishes that resulted in significantly greater algal biomass inside the cages than outside. While algal biomass continued to increase within the cages, algal species composition has changed drastically at the middle of the experimental period. During the first half period (3 months) when encrusting turf algae covered substrate adjacent to coral branchlets inside the cages, coral branchlets could not expand their attachment area on the substrata. In contrast, during the second half period (3 months) corals started rapid growth after turf algae disappeared and frondose macroalgae dominated. We conclude that turf algae may prevent the growth of juvenile acroporid corals especially in the early stages of horizontal expansion prior to the vertical growth.","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132891913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Tuấn, P. Hoang, Hua Thai Tuyen, Thai Minh Quang, H. Bền
± 26.1%), Montipora (10.1 ± 5.7%; Fig. 1A). Two genera Galaxea and Diploastrea did not suffer bleaching. Acropora with most branch and tabulate colonies were less impacted both in deep and shalow waters (0.9 ± 1.3% bleached; Fig. 1D - F). Hard corals in deeper waters exhibited a higher susceptibility to bleaching than their shallow counterparts (48% bleached in deeper transects compared with 15% in shallow transects). The findings were consistent with the higher abundance of the five most susceptible genera mentioned above in deeper (total mean cover ＝ 17.5%) than in shallow (2.2%) transects. An earlier bleaching event at Con Dao islands in October 1998 resulted in 37.8% of hard coral colonies bleached (Vo 2000). The 2019 event had both similarities and differences in impacts. Soft corals were the most susceptible in both events (100% bleached) and Galaxea remained consistently unbleached. In 2019, Pachyseris and Fungia had much higher levels of bleaching than in 1998, when these genera were little affected (7.7% and 8.3% bleached). In contrast, Diploastrea had no bleaching compared with 14% bleached in 1998. Porites was severely impacted at both events with 57% bleached and many dead massive corals covered by filamentous algae were recorded in October 1998. Acropora were among the susceptible genera with 19% bleached colonies together with many dead colonies observed in October 1998 (Vo 2000).
{"title":"Genus-specific bleaching at Con Dao Islands, Southern Vietnam, June 2019","authors":"V. Tuấn, P. Hoang, Hua Thai Tuyen, Thai Minh Quang, H. Bền","doi":"10.3755/galaxea.22.1_27","DOIUrl":"https://doi.org/10.3755/galaxea.22.1_27","url":null,"abstract":"± 26.1%), Montipora (10.1 ± 5.7%; Fig. 1A). Two genera Galaxea and Diploastrea did not suffer bleaching. Acropora with most branch and tabulate colonies were less impacted both in deep and shalow waters (0.9 ± 1.3% bleached; Fig. 1D - F). Hard corals in deeper waters exhibited a higher susceptibility to bleaching than their shallow counterparts (48% bleached in deeper transects compared with 15% in shallow transects). The findings were consistent with the higher abundance of the five most susceptible genera mentioned above in deeper (total mean cover ＝ 17.5%) than in shallow (2.2%) transects. An earlier bleaching event at Con Dao islands in October 1998 resulted in 37.8% of hard coral colonies bleached (Vo 2000). The 2019 event had both similarities and differences in impacts. Soft corals were the most susceptible in both events (100% bleached) and Galaxea remained consistently unbleached. In 2019, Pachyseris and Fungia had much higher levels of bleaching than in 1998, when these genera were little affected (7.7% and 8.3% bleached). In contrast, Diploastrea had no bleaching compared with 14% bleached in 1998. Porites was severely impacted at both events with 57% bleached and many dead massive corals covered by filamentous algae were recorded in October 1998. Acropora were among the susceptible genera with 19% bleached colonies together with many dead colonies observed in October 1998 (Vo 2000).","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133808828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manoli Reef Complex (MRC) and Kurusadai Reef Complex (KRC) of the Gulf of Mannar, southeast coast of India were taken for this study to estimate the biophysical status of the coral reef ecosystems. This study was conducted between the years 2006 and 2008. About 25 sites all around the islands were chosen for this study. Among them, good Live Coral (LC) cover was recorded in fourteen sites. The other categories like Dead coral with algae, Exposed reef and Rubble, Seagrass, Algal assem-blage, Muddy flat and Sandy flat were also considered in this study. The estimated sedimentation rate of this area was higher in seaward sides than the shoreward sides.
{"title":"Reef status in the Mandapam group of Islands, Gulf of Mannar","authors":"N. Marimuthu, J. J. Wilson, A. Kumaraguru","doi":"10.3755/GALAXEA.12.65","DOIUrl":"https://doi.org/10.3755/GALAXEA.12.65","url":null,"abstract":"Manoli Reef Complex (MRC) and Kurusadai Reef Complex (KRC) of the Gulf of Mannar, southeast coast of India were taken for this study to estimate the biophysical status of the coral reef ecosystems. This study was conducted between the years 2006 and 2008. About 25 sites all around the islands were chosen for this study. Among them, good Live Coral (LC) cover was recorded in fourteen sites. The other categories like Dead coral with algae, Exposed reef and Rubble, Seagrass, Algal assem-blage, Muddy flat and Sandy flat were also considered in this study. The estimated sedimentation rate of this area was higher in seaward sides than the shoreward sides.","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"48 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113975583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As common practices, evaluation process is done by special dive task force unit to conduct diving activity to observe on how Artificial Reefs (AR) growth. This evaluation for effectiveness and efficiency of AR development is quite difficult and troublesome. In this paper, the framework architecture for databases integration process using location coordinate data (longitude and latitude) of AR will matches with the fish catches data from identified fish landing port that using SIDIF. With SIDIF, the data of fish catches will be mapped with data on location coordinate of AR as a whole via mapping and integration of these two different databases. Using this methodology, the effectiveness and efficiency of AR development will be achieved as well as the evaluation will be measured.
{"title":"SIDIF: Spatial Information Databases Integration Framework","authors":"M. Mustafa, Zailani Ms, Zaidi Mz","doi":"10.3755/GALAXEA.15.66","DOIUrl":"https://doi.org/10.3755/GALAXEA.15.66","url":null,"abstract":"As common practices, evaluation process is done by special dive task force unit to conduct diving activity to observe on how Artificial Reefs (AR) growth. This evaluation for effectiveness and efficiency of AR development is quite difficult and troublesome. In this paper, the framework architecture for databases integration process using location coordinate data (longitude and latitude) of AR will matches with the fish catches data from identified fish landing port that using SIDIF. With SIDIF, the data of fish catches will be mapped with data on location coordinate of AR as a whole via mapping and integration of these two different databases. Using this methodology, the effectiveness and efficiency of AR development will be achieved as well as the evaluation will be measured.","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122567160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Denis, J. K. Leung, Chia-Min Hsu, H. Hsieh, W. Tsai, Chaolun Allen Chen
2012, after more than one year in total darkness and being exposed to temperature from 10.7 to 31.3oC, this colony was still alive and visually seemed unaffected by such conditions (Fig. 1a). Moreover, extra-tentacular buddings suggested that this colony continues to grow over this period. Lack of chlorophyll fluorescence (
{"title":"Dark survival of Oulastrea crispata","authors":"V. Denis, J. K. Leung, Chia-Min Hsu, H. Hsieh, W. Tsai, Chaolun Allen Chen","doi":"10.3755/GALAXEA.14.117","DOIUrl":"https://doi.org/10.3755/GALAXEA.14.117","url":null,"abstract":"2012, after more than one year in total darkness and being exposed to temperature from 10.7 to 31.3oC, this colony was still alive and visually seemed unaffected by such conditions (Fig. 1a). Moreover, extra-tentacular buddings suggested that this colony continues to grow over this period. Lack of chlorophyll fluorescence (","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123901408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wararat Sirianansakul, N. Pumijumnong, T. Mitsuguchi, S. Putchakarn, N. Boontanon
Abstract The Mg/Ca and Sr/Ca ratios were determined for Porites lutea specimens that were collected from Koh Chueak, Surat Thani Province, Thailand, using inductively coupled plasma optical emission spectrometry. The elemental analyses were performed from the surface to the interior of the coral specimen along its growth axis at 1mm intervals, generating the nearmonthly resolved time series for the Mg/Ca and Sr/Ca ratios. The ratios demonstrate clear annual cycles, which are assumed to reflect variations in the sea surface temperature (SST). Comparing with the annual maximum and minimum values of SST, the following Mg/Ca -SST and Sr/Ca-SST relations were determined: Mg/Ca (mmol/mol)＝−1.72＋0.193×SST and Sr/Ca (mmol/mol)＝11.83−0.098× SST. These relations are different than those of previously published studies. The reason for this difference is unclear; however, it may be related to vital effects that have been observed for geochemical proxies in coral skeletons and to differences in chemical composition of seawater and in sampling procedure.
{"title":"Mg/Ca and Sr/Ca ratios in a coral from Koh Chueak, Surat Thani, Thailand","authors":"Wararat Sirianansakul, N. Pumijumnong, T. Mitsuguchi, S. Putchakarn, N. Boontanon","doi":"10.3755/GALAXEA.14.63","DOIUrl":"https://doi.org/10.3755/GALAXEA.14.63","url":null,"abstract":"Abstract The Mg/Ca and Sr/Ca ratios were determined for Porites lutea specimens that were collected from Koh Chueak, Surat Thani Province, Thailand, using inductively coupled plasma optical emission spectrometry. The elemental analyses were performed from the surface to the interior of the coral specimen along its growth axis at 1mm intervals, generating the nearmonthly resolved time series for the Mg/Ca and Sr/Ca ratios. The ratios demonstrate clear annual cycles, which are assumed to reflect variations in the sea surface temperature (SST). Comparing with the annual maximum and minimum values of SST, the following Mg/Ca -SST and Sr/Ca-SST relations were determined: Mg/Ca (mmol/mol)＝−1.72＋0.193×SST and Sr/Ca (mmol/mol)＝11.83−0.098× SST. These relations are different than those of previously published studies. The reason for this difference is unclear; however, it may be related to vital effects that have been observed for geochemical proxies in coral skeletons and to differences in chemical composition of seawater and in sampling procedure.","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124530972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Presence of Alveopora tizardi (Scleractinia: Acroporidae) as an epibiont on molluscan shells in an anchialine lake of a raised atoll, Kakaban Island, East Kalimantan, Indonesia: An opportunist or a survivor?","authors":"T. Tomascik, A. J. Mah","doi":"10.3755/galaxea.g25-5","DOIUrl":"https://doi.org/10.3755/galaxea.g25-5","url":null,"abstract":"","PeriodicalId":118057,"journal":{"name":"Galaxea, Journal of Coral Reef Studies","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121377492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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