Journal ArticleDOI
The plankton community of Lake Matano: factors regulating plankton composition and relative abundance in an ancient, tropical lake of Indonesia
Elisabeth Sabo,Elisabeth Sabo,Denis Roy,Paul B. Hamilton,Peter E. Hehanussa,Roger McNeely,G. Douglas Haffner +6 more
TLDR
It was concluded that chemical factors as opposed to physical or biological processes were regulating the observed very low standing crops of phytoplankton which in turn supports a very minimal zooplankon community restricted in both species composition and abundance.Abstract:
Recent evidence reveals that food webs within the Malili Lakes, Sulawesi, Indonesia, support community assemblages that are made up primarily of endemic species. It has been suggested that many of the species radiations, as well as the paucity of cosmopolitan species in the lakes, are related to resource limitation. In order to substantiate the possibility that resource limitation is playing such an important role, a study of the phytoplankton and zooplankton communities of Lake Matano was implemented between 2000 and 2004. We determined species diversity, relative abundances, size ranges, and total biomass for the phytoplankton and zooplankton, including the distribution of ovigerous individuals throughout the epilimnion of Lake Matano in three field seasons. The phytoplankton community exhibited very low biomass (<15 μg l−1) and species richness was depressed. The zooplankton assemblage was also limited in biomass (2.5 mg l−1) and consisted only of three taxa including the endemic calanoid Eodiaptomus wolterecki var. matanensis, the endemic cyclopoid, Tropocyclops matanensis and the rotifer Horaella brehmi. Zooplankton were very small (<600 lm body length), and spatial habitat partitioning was observed, with Tropocylops being confined to below 80 m, while rotifer and calanoid species were consistently observed above 80 m. Less than 0.1% of the calanoid copepods in each year were egg-bearing, suggesting very low population turnover rates. It was concluded that chemical factors as opposed to physical or biological processes were regulating the observed very low standing crops of phytoplankton which in turn supports a very minimal zooplankton community restricted in both species composition and abundance. As chemical factors are a function of the catchment basin of Lake Matano, it is predicted that resource limitation has long played an important role in shaping the unique endemic assemblages currently observed in the food web of the lake.read more
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Characteristics, main impacts, and stewardship of natural and artificial freshwater environments: consequences for biodiversity conservation
Marco Cantonati,Sandra Poikane,Catherine M. Pringle,Lawrence E. Stevens,Eren Turak,Eren Turak,Jani Heino,John S. Richardson,Rossano Bolpagni,Alex Borrini,Núria Cid,Martina Čtvrtlíková,Diana M. P. Galassi,Michal Hájek,Ian Hawes,Zlatko Levkov,Luigi Naselli-Flores,Abdullah A. Saber,Mattia Di Cicco,Barbara Fiasca,Paul B. Hamilton,Jan Kubečka,Stefano Segadelli,Petr Znachor +23 more
TL;DR: In this article, the main biodiversity patterns and ecological features, human impacts on the system and environmental issues, and discuss ways to use this information to improve stewardship are identified, and the authors consider all main types of natural and artificial inland freshwater habitas (fwh).
Journal ArticleDOI
Hydrological connectivity and mixing of Lake Towuti, Indonesia in response to paleoclimatic changes over the last 60,000 years
TL;DR: In this paper, a new record of sediment geochemistry from Lake Towuti (2.5°S, 121.5ºE) was generated to investigate changes in hydrological connectivity with upstream lakes and the extent of lake mixing and oxygenation during paleoclimate changes over the last 60,000 years BP (60.ka).
Journal ArticleDOI
The Ancient Lakes of Indonesia: Towards Integrated Research on Speciation
TL;DR: The Malili Lakes of Sulawesi, Indonesia are an outstanding natural model for integrative research into speciation as they offer the opportunity to explore the roles of geography, dispersal, and selection in the radiation of aquatic organisms.
Journal ArticleDOI
Impact of anthropogenic activities on water quality and plankton communities in the Day River (Red River Delta, Vietnam).
Hang Thi Thu Hoang,Thi Thuy Duong,Thi Thuy Duong,Kien T. Nguyen,Quynh Thi Phuong Le,Minh T. N. Luu,Duc Anh Trinh,Anh Hung Le,Cuong Tu Ho,Kim Dinh Dang,Julien Némery,Julien Némery,Didier Orange,Didier Orange,Judith Klein +14 more
TL;DR: The Day River was divided into three main site groups based on water quality and characteristics of plankton community and temperature and nutrients (total phosphorus and total nitrogen) are key factors regulating plankton abundance and distribution in the Day River.
Journal ArticleDOI
Heterotrophic bacteria from an extremely phosphate-poor lake have conditionally reduced phosphorus demand and utilize diverse sources of phosphorus.
Mengyin Yao,Felix J Elling,CarriAyne Jones,Sulung Nomosatryo,Christopher P. Long,Sean A. Crowe,Maciek R. Antoniewicz,Kai-Uwe Hinrichs,Julia A. Maresca +8 more
TL;DR: The results demonstrate that heterotrophs isolated from this unusual environment alter their macromolecular composition, which allows the organisms to grow efficiently even in their extremely phosphorus-limited environment.
References
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Journal ArticleDOI
Zur Vervollkommnung der quantitativen Phytoplankton-Methodik
TL;DR: In this paper, the main aim is to describe the counting-chamber method and the numerous difficulties encountered in quantitative plankton research are discussed and ways of avoiding them are described together with improvements of technique that save time.
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Journal ArticleDOI
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