ORCID Profile
0000-0002-6961-8752
Current Organisation
Badan Riset dan Inovasi Nasional Republik Indonesia
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer Science and Business Media LLC
Date: 02-08-2023
DOI: 10.1007/S00027-023-00982-8
Abstract: Floodplains are highly complex ecosystems representing high bio ersity and conservation values, but they are also one of the world’s most threatened ecosystems due to extensive development and anthropogenic activities. Lake Tempe is a lowland riverine floodplain lake in Sulawesi Island, Indonesia, that is subject to multiple stressors such as flow alteration, eutrophication and invasive species. In this study, the dynamics of the zooplankton community size structure was investigated in Lake Tempe. Five size-based metrics, including zooplankton mean body size, total abundance, total, biomass, and normalised biomass size spectra (NBSS) slope and intercept were assessed from net-s led zooplankton collected monthly from March to December 2016, and the role of environmental variables in shaping these size-based metrics were also examined. Zooplankton community size structure is a useful metric as it is less labour intensive than traditional approaches, provides more data accuracy and does not require highly specialised taxonomic expertise. The zooplankton community in Lake Tempe was characterised by high density of small-sized zooplankton with an average mean body size 500 µm equivalent spherical diameter. While the zooplankton density was characterised by the dominance of the size class 300–700 µm, there was evidence of a significant contribution of the size 700 µm towards total biomass. Seasonal hydrological regimes, water temperature and eutrophication parameters, as indicated by total phosphorus and chlorophyll- a concentration, had a significant role in driving the variability of zooplankton community size structure in this system. The results of this study are not only a significant step in providing critical baseline information on the zooplankton assemblage of Lake Tempe, but is also a significant contribution to the overall understanding of zooplankton community structure in tropical lakes, and will aid in improving lake management plans in these regions.
Publisher: IOP Publishing
Date: 04-2021
DOI: 10.1088/1755-1315/744/1/012092
Abstract: Study on freshwater ecology have been long focused on subtropical habitats with few references to tropical regions including Indonesia. Zooplankton, in particular, is an important component of aquatic ecosystem as they are key player of aquatic food webs, thus a solid understanding of their community structure can be of direct benefit to freshwater ecosystem management. The spatial patterns of zooplankton ersity in Lake Tondano, Celebes Island – Indonesia were studies in 2013, with the main aim was to understand how local environmental and habitat heterogeneity driving the zooplankton community structure. We performed field s lings to collect zooplankton using a vertical tow with a 156 μm mesh plankton net from 1 meter above sediment to the surface and to measure environmental parameters using portable multi probes water quality checker from three different water columns. The s ling sites were selected to include different habitats within the lake to look at ersity of the entire zooplankton communities including Rotifers, Cladocerans, and Copepods in Lake Tondano, Indonesia. A total of 21 species of cladocerans, 31 copepods, and 60 rotifers were identified from Lake Tondano. Our result indicates a relatively low number of cladocerans which is may be associated with high predatory pressure from planktivorous fish, especially within the open pelagic zone.
Publisher: IOP Publishing
Date: 07-2020
DOI: 10.1088/1755-1315/535/1/012007
Abstract: Limnology in the tropics provides a new paradigm for inland water science, which has traditionally focused on temperate regions. Numerous studies have shown that tropical inland waters are fundamentally different from temperate systems. Warm conditions, combined with higher solar radiation and higher precipitation rates, have important consequences for biogeochemical processes in tropical waters. In addition, rapid population and economic growth has resulted in high levels of anthropogenic pressures on these systems. Such pressures have resulted in a reduction in the adequate supply of water of acceptable quality in many tropical countries and provide challenges to limnologists in terms of societal concerns and climate change impacts. Using a bibliometric approach to assessing limnological studies in the tropics, we examined how tropical limnology has barely touched the fundamental complexity that tropical inland waters have. Over 12,000 references were found and indexed by Scopus as being within the category of “limnology”. Only 335 of these were grouped under tropical studies. However, similar to those studied globally, studies from the tropics focused mainly on “lake”, “river”, “phytoplankton”, “carbon”, “oxygen”, “fish” and “nutrient”. While areas of research tended to reflect how limnologists perceive the impacts of climate change and eutrophication on lentic and lotic systems, the ecosystem services provided by inland waters and their resilience to disturbance were found to require further study.
Publisher: IOP Publishing
Date: 07-2022
DOI: 10.1088/1755-1315/1062/1/012014
Abstract: Phytoplankton plays an important role in aquatic ecosystems and is one of the biological parameters that can be used as bioindicators to describe conditions, quality, and environmental changes. Jakarta Bay is polluted by various wastes originating from industry, domestic, and sea transportation for fishing activities, which causes a decrease in water quality in Jakarta Bay. This study aims to reveal the composition of phytoplankton and its relationship with the physical and chemical parameters of the waters that empty into Jakarta Bay. The study was conducted in September 2021 at three s ling stations in estuary areas. Station 3 was the most polluted area from industrial waste, only found phytoplankton from the group of Cyanophyta (61.57%) and Euglenophyta (38.43%). Meanwhile, station 2 with the highest concentration of chlorophyll-a, contaminated with domestic waste was dominated by Cyanophyta (29.26%), Euglenophyta (11.79%), Chrysophyta (39.74%), and Chlorophyta (19.21%) groups. The water quality of the two s ling stations greatly affects the composition and abundance of phytoplankton.
Publisher: IOP Publishing
Date: 07-2022
DOI: 10.1088/1755-1315/1062/1/012019
Abstract: Kapuas River in West Kalimantan with over 1,143 km is the largest river in Indonesia. It serves as a main refuge for high potential bio ersity. Oxbow lakes along the Kapuas River are of high ecological essential due to the number and the ersity of habitats they provide. In addition, oxbow lakes are critical components of the floodplain systems of lowland rivers. The objective of this study was to explore the ersity of oxbow lakes and their connectivity to the main river. We conducted fieldwork to measure water quality and ecological components at 12 oxbow lakes along the Kapuas River and two lakes in the Sentarum complex in January - February 2020. We measured the environmental parameters including water depth, water temperature, Secchi/transparency, pH, dissolved oxygen concentration, chlorophyll-a concentration, total nitrogen, and total phosphorus concentrations. Aquatic biota, including phytoplankton and zooplankton community structures, were also observed at 12 oxbow lakes along the Kapuas River and two lakes in the Sentraum complex. The s ling points represented both permanent and non-permanent connectivity of the oxbow lakes to the main river. The result indicates the variability of environmental characteristics between the lakes, based on water quality and biota analysis for ex le, water acidity, as indicated by pH, was likely to seem like the main variable determining the oxbow lake biota. Also, the habitat connectivity of oxbow lakes to the main river has significantly influenced the biotic composition.
Publisher: MDPI AG
Date: 16-08-2022
DOI: 10.3390/W14162518
Abstract: Floodplain ecosystems are characterised by alternating flood and drought periods that can affect the structure of the aquatic community. Dynamic changes in the hydrological regimes from flooding to dry periods influence the migration and dispersal of aquatic fauna and the exchange of particulate matter and nutrients. Riverine floodplains are among the most productive ecosystems however, increasing pressure from anthropogenic activities has altered the hydrological regimes, threatening aquatic bio ersity. In this study, we examined the temporal patterns of zooplankton community size structure and fish density during three distinct hydrological events in a tropical floodplain lake, Lake Tempe, Indonesia. We included fish density data and three contrasting hydrological conditions, moderate-, high-, and low-water periods, as the environmental factors regulating zooplankton community structure. In high- and low-water conditions, the ecosystem heterogeneity was characterised by high chlorophyll-a, total nitrogen, and total phosphorus concentrations high fish density and high zooplankton abundance and biomass. During the early flood period, the ecosystem was characterised by lower concentrations of trophic indicators and significant decreases in zooplankton abundance and biomass, as well as decreased fish density. While there was no clear association between hydrological conditions and zooplankton size structure, our findings indicate that fish predation probably suppressed zooplankton size ersity in Lake Tempe, shown by the dominant contribution of small-sized zooplankton towards total abundance and biomass under all hydrological conditions. Our results indicate that the patterns of environmental variables, zooplankton community, and fish density are affected by hydrological conditions, highlighting the role of water level fluctuation as the driving factor for zooplankton community structure. Our results also indicated that fish predation led to the development of a small-sized population of zooplankton in Lake Tempe.
Publisher: Elsevier BV
Date: 2012
Publisher: MDPI AG
Date: 22-08-2021
DOI: 10.3390/W13162305
Abstract: Urban lakes are important environmental assets that contribute significant ecosystem services in urbanised areas around the world. Consequently, urban lakes are more exposed to anthropogenic pressures. Zooplankton communities play a central role in lake processes and, as such, are very sensitive to the impacts of human activities both through in-lake and catchment processes. Understanding their ecological function in urban lakes and how they respond to urbanisation is essential for environmental sustainability. In this study, we investigated the reliability of zooplankton size structure as indicators of anthropogenic stressors in urban lakes. We examined the relationship between environmental variables and zooplankton community size spectra derived as mean body size, density, and biomass. Our study showed that the overall mean body size was within the small size group ranged from 416 to 735 µm equivalent spherical diameter (ESD). Despite no significant difference in total zooplankton density between lakes, there was variability in the total density of the five different size classes. Total biomass was characterised by a significant proportion of size µm. As the specific parameter of normalised biomass size spectra (NBSS), the slopes of the NBSS varied from moderate (−0.83 to −1.04) for a community with higher biomass of the larger size zooplankton to steeper slopes (from −1.15 to −1.49) for a community with higher biomass of smaller size. The environmental variables, represented by total phosphorus (TP) and chlorophyll a (chl-a), had a strong effect on zooplankton biomass and NBSS, where TP and chl-a were significantly correlated with the increase of total biomass and corresponded well with a less negative slope. Our results indicated that the community metric was sensitive to nutrient input and that size-based metrics have the potential to serve as key indicators for the management of urban lakes.
Location: Indonesia
No related grants have been discovered for Reliana Lumban Toruan.