Pressure on oxygen levels of Jakarta Bay

Ladwig, Norbert; Hesse, Kirsten; Wulp, Simon A. van der; Damar, Ario; Koch, Daniela

doi:10.1016/j.marpolbul.2016.04.017

Cited by 28 publications

(19 citation statements)

References 10 publications

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“…In a decade, the land cover had reduced from 340,90 ha in 1997 to 232,04 in 2006, equating 31.93% loss (Parawansa 2007). This change is mainly caused by land degradation with human as the main driver as indicated by many studies such as Permanawati et al (2013), Kusuma et al (2014), KLHK and Plarenco (2015), Breckwoldt et al (2016), Ladwig et al (2016), Simon et al (2016), Sindern et al (2016), Siregar et al (2016), Dsikowitzky et al (2018), and Latief et al (2018).…”

Section: Introductionmentioning

confidence: 99%

The The structure of mangrove communities in response to water quality in Jakarta Bay, Indonesia

et al. 2019

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Abstract. Sari N, Patria MP, Soesilo TEB, Tejakusuma IG. 2019. The structure of mangrove communities in response to water quality in Jakarta Bay, Indonesia. Biodiversitas 20: 1873-1879. The waters of Jakarta Bay, which is a habitat for mangrove vegetation, have been polluted caused by many human activities such as development of housing, industry, tourism and facilities along the coast, and reclamation of man-made islands. The islands reclamation has caused changes in ocean current pattern and has impacts on material mobilization in the waters. The mangroves have experienced degradation as well since long time ago. The purpose of this research was to investigate the responses of mangrove vegetation to the quality of water in disturbed areas in Jakarta Bay to be used as baseline information for mangrove forest management in the area. Analysis of vegetation was used to examine mangrove community structure with the results were then related to the measurements on water quality using simulation modeling. The results show that mangrove forests in Jakarta Bay have an average Important Value Index (IVI) for all levels of life stage 95.7% with relative density of 28.85%, relative frequency of 29.21%, and closure relative of 38.62%. These results indicate that the mangrove forests in Jakarta Bay are under the criteria of damaged or disturbed according to the Minister of Environment Regulation. The mangrove forests were dominated by Avicennia marina, Avicennia lanata, Rhizophora apiculata, Sonneratia caseolaris, and Sonneratia alba. The average of ocean current velocity was 0.04-0.08 m/s. tides were single type with short waves generated by wind. The water discharge from 13 rivers were 205 ± 97 m3/s and the water discharge from power plant 224.9 m3/s. The heavy metal whereas The average pH was 7.75; Dissolved Oxygen 4.68 mg/L; turbidity 5 m; Total Suspended Solid (TSS) 50.95 mg/L; and salinity 6.6 ‰. The result of grain size analysis showed that most sediments obtained was in the form of silt with a mixture of little clay and sand. The responses showed that there was a reinforced pattern for pH, temperatures, rainfall, brightness, sediment, DO, and ocean current, with a trend of exponential growth in two years next of important value index of mangroves in response to water quality in Jakarta Bay. The heavy metals of Pb have concentrations of 65-104 ppm in sediments and 38-60 ppm in the water column; Zn has 150-258 ppm in sediment and 42-140 ppm in water column; Cu has 34-72 ppm in sediment and 13-30 ppm in water column; Ni has 33-39 ppm in sediment and 40-50 ppm in water column; Cd has 5.9-8 ppm in sediment and 8.5-15 ppm in the water column. The heavy metals, TSS, and water river discharge have balance-decay pattern. The amount of river water discharge entering Jakarta Bay, the heavy metals, and the low level of ocean currents cause coastal waters of Jakarta Bay to become muddy puddles that cannot flow properly. These conditions make the mangrove forest habitat becomes polluted and the mangrove vegetation degraded. Therefore, all of these things need to get serious attention so the mangrove forests can be restored and the function of mangroves can return to normal.

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Section: Introductionmentioning

confidence: 99%

The The structure of mangrove communities in response to water quality in Jakarta Bay, Indonesia

et al. 2019

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“…Most megacities included Jakarta, have some various environmental problems such as water pollution and coastal littering, eutrophication, seafood contamination, depletion of fishery resources and loss of habitat (Pelling & Blackburn, 2013). This is proved by the current study, Ladwig, Hesse, van der Wulp, Damar and Koch, (2016) which stated that problem area of Jakarta bay represents eutrophication with the 60% oxygen saturation and classified as "poor". One of the contamination sources is the river which discharges into the coastal and catchment area.…”

Section: Fish Species Concentration [Mg/kg (Dry Weight) ± Sd]mentioning

confidence: 56%

Human Health Risk Assessment of Heavy Metals Bioaccumulation In Fish and Mussels from Jakarta Bay

Putri

Barokah

Andarwulan

2017

Squalen Bull. Marine Fisheries Postharvest Biotech.

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Aquatic environment of Jakarta Bay have already been highlighted due to its heavy metals contamination which may lead into food safety concern of fisheries products derived from this region. This research aimed to investigate bioaccumulation level of heavy metals (Pb, Cd, and As) in fish and mussels from Jakarta Bay, as a human risk assessment of seafood consumption. Samples of mussels and fish were taken from Penjaringan, Tarumanegara, Cilincing, and Tanjung Pasir district. Bioaccumulation of heavy metals was analyzed by Inductively Coupled Plasma -Mass Spectrometry technique. Results of the study revealed that metals bioaccumulation in fisheries products were varied, with As (Arsenic) as the highest metal contaminant (0.68 mg/kg, dry weight). Furthermore, estimated daily intake (EDI), target hazard quotient (THQ), total target hazard quotient (TTHQ), and safety limits prescribed by various agencies, showed that consumption of fisheries products from Jakarta Bay considered as relatively safe for human health in total of food ingestion rate of fish 57.34 g/day. These results are expected to serve as a baseline to construct preventive and palliative policies for food safety of fisheries products from Jakarta Bay.

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“…Other studies have reported similarly high values for eutrophication along the Thousand Islands, e.g. DIN levels of up to 21 μM/L (Ladwig et al, 2016) and total nitrogen of 54 μM/L as well as total phosphate levels of 5.2 μM/L (Van der Wulp et al, 2016). This extreme eutrophication may be the consequence of massive land runoff, lack of sewage treatment and large-scale agri- and aquaculture in the area.…”

Section: Discussionmentioning

confidence: 67%

Abundance and physiology of dominant soft corals linked to water quality in Jakarta Bay, Indonesia

Baum

Januar

Ferse

et al. 2016

PeerJ

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Declining water quality is one of the main reasons of coral reef degradation in the Thousand Islands off the megacity Jakarta, Indonesia. Shifts in benthic community composition to higher soft coral abundances have been reported for many degraded reefs throughout the Indo-Pacific. However, it is not clear to what extent soft coral abundance and physiology are influenced by water quality. In this study, live benthic cover and water quality (i.e. dissolved inorganic nutrients (DIN), turbidity (NTU), and sedimentation) were assessed at three sites (< 20 km north of Jakarta) in Jakarta Bay (JB) and five sites along the outer Thousand Islands (20–60 km north of Jakarta). This was supplemented by measurements of photosynthetic yield and, for the first time, respiratory electron transport system (ETS) activity of two dominant soft coral genera, Sarcophyton spp. and Nephthea spp. Findings revealed highly eutrophic water conditions in JB compared to the outer Thousand Islands, with 44% higher DIN load (7.65 μM/L), 67% higher NTU (1.49 NTU) and 47% higher sedimentation rate (30.4 g m−2 d−1). Soft corals were the dominant type of coral cover within the bay (2.4% hard and 12.8% soft coral cover) compared to the outer Thousand Islands (28.3% hard and 6.9% soft coral cover). Soft coral abundances, photosynthetic yield, and ETS activity were highly correlated with key water quality parameters, particularly DIN and sedimentation rates. The findings suggest water quality controls the relative abundance and physiology of dominant soft corals in JB and may thus contribute to phase shifts from hard to soft coral dominance, highlighting the need to better manage water quality in order to prevent or reverse phase shifts.

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Pressure on oxygen levels of Jakarta Bay

Cited by 28 publications

References 10 publications

The The structure of mangrove communities in response to water quality in Jakarta Bay, Indonesia

The The structure of mangrove communities in response to water quality in Jakarta Bay, Indonesia

Human Health Risk Assessment of Heavy Metals Bioaccumulation In Fish and Mussels from Jakarta Bay

Abundance and physiology of dominant soft corals linked to water quality in Jakarta Bay, Indonesia

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