OLDI (Oseanologi dan Limnologi di Indonesia)最新文献

{"title":"Variasi Fluks CO2 Udara-Laut di Perairan Pesisir Pulau Bintan","authors":"A. Afdal, Hanif Budi Prayitno, A. Wahyudi, Suci Lastrini","doi":"10.14203/OLDI.2020.V5I3.266","DOIUrl":"https://doi.org/10.14203/OLDI.2020.V5I3.266","url":null,"abstract":"<strong>Variation of Air-Sea CO₂ Fluxes in Bintan Island Coastal Water. </strong>Eastern part of Bintan coastal water plays a major role as CO₂ sink. However, flux and partial pressure of CO₂ (<em>p</em>CO₂) dynamically follows spatio-temporal variability. Spatio-temporal variability of CO₂ flux may shows the whole condition of Bintan Island coastal water, especially in correlation with the primary production. Systematic study on variability of CO₂ flux from or to the watern column is essential to understand the whole conditions of Bintan Island coastal water. This study aims to understand the spatio-temporal variation of CO₂ fluxes in Bintan Island coastal water, and the factors influencing it. This study was conducted in the eastern part of Bintan coastal water in April and August 2014. In addition, this study was also conducted in the southern and northern parts in April 2016. CO₂ fluxes dynamics were calculated from <em>p</em>CO₂ (surface water and atmosphere), temperature, salinity, and wind speed. The result showed that almost all parts of the Bintan coastal water were carbon sources during first transition season. The largest CO₂ emission was observed in the northern part (4.02 ± 1.92 mmol/m²/d) followed by the southern part (2.28 ± 0.80 mmol/m²/d) and then the eastern part (0.46 ± 0.28 mmol/m²/d). The eastern part temporally turned into CO₂ sink in the southwest monsoon season (-0.27 ± 0.10 mmol/m²/d). Temperature was the main factor causing spatial and temporal variability of air-sea CO₂ fluxes in the Bintan coastal water. Spatially, the presence of seagrass and coral reef ecosystems causes the partial pressure of surface water CO₂ in the eastern part of waters of Bintan is much lower compared to the waters of north and south Bintan, thus emitting less CO₂ to the atmosphere","PeriodicalId":202832,"journal":{"name":"OLDI (Oseanologi dan Limnologi di Indonesia)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125345096","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":"Pertumbuhan dan Sintasan Juvenil Teripang Pasir Holothuria scabra pada Pemeliharaan Dengan dan Tanpa Rumput Laut Gracilaria sp., Menggunakan Keramba Apung dan Tancap di Tambak","authors":"Dedy Kurnianto, Lisa Fajar Indriana, A. Wahab, Syafriyadi Hafid, Balkam F. Badi","doi":"10.14203/OLDI.2020.V5I3.340","DOIUrl":"https://doi.org/10.14203/OLDI.2020.V5I3.340","url":null,"abstract":"<p><strong>Growth and Survival of Sandfish <span style=\"text-decoration: underline;\">Holothuriascabra</span> Juveniles </strong><strong>Grown </strong><strong>with and without Seaweed <span style=\"text-decoration: underline;\">Gracilaria</span> sp</strong><strong>.,</strong><strong> using Floating and Fixed Hapas in </strong><strong>Earthen </strong><strong>Pond</strong><strong>. </strong><span style=\"text-decoration: underline;\">Holothuriascabra</span> known as sandfish have long been used for pharmaceutical, cosmetic, and food industries.Juveniles production is one of the ways to address the problem of raw material availability due to declining sandfish population in the wild. This research aimed to determine growth performance and survival of sandfish juveniles reared with and without seaweed <span style=\"text-decoration: underline;\">Gracilaria</span> sp.  using floating and fixed hapas in earthen pond. The research was conducted from May to September 2014. A completely randomized design was used to arrange 12 hapas of four treatments groups with three replicates including floating hapas without <span style=\"text-decoration: underline;\">G</span><span style=\"text-decoration: underline;\">racilaria</span> sp. (ATR), floating hapas with <span style=\"text-decoration: underline;\">G</span><span style=\"text-decoration: underline;\">racilaria</span>sp. (ADR), fixed hapas without <span style=\"text-decoration: underline;\">G</span><span style=\"text-decoration: underline;\">racilaria</span> sp. (TTR) and fixed hapas with <span style=\"text-decoration: underline;\">G</span><span style=\"text-decoration: underline;\">racilaria</span> sp. (TDR). Some parameters was observed includingweight increment, Growth Rate (GR),Specific Growth Rate(SGR), Biomass, Survival, and Water Quality. The result showed that GR and SGR were not significantlydifferent among treatments (P>0.05). Survial and Biomass showed significant difference among treatments (P <0.05). ATR has the highest GR, SGR, survival, dan biomass whereas TDR has the lowest GR, SGR, survival, dan biomass. Water quality parameters were in optimal range for sandfish rearing. Added<span style=\"text-decoration: underline;\">G</span><span style=\"text-decoration: underline;\">racilaria</span> sp.tend to inhibitGR, SGR, survival, dan biomass.<strong></strong></p>","PeriodicalId":202832,"journal":{"name":"OLDI (Oseanologi dan Limnologi di Indonesia)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130464084","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}