Tohoku University · Environmental Science
Professor Takashi Sakamaki's research lab specializes in aquatic ecosystem ecology, focusing on the biogeochemical dynamics of organic matter across stream-forest and estuarine-terrestrial interfaces. The lab investigates how landscape characteristics, such as land use and riparian forest conditions, influence the quality and quantity of particulate organic matter (POM) and its role in shaping food web dynamics and sediment carbon cycling. Key research directions include stream–landscape linkages, oyster biodeposition processes, and the long-term stability of carbon in tidal flats, with an emphasis on understanding scale-dependent ecological processes in temperate watersheds and estuaries. The lab employs field monitoring, mesocosm experiments, and stable isotope analysis to trace organic matter flow and ecosystem function across environmental gradients.
Figures are computed from collected data and may differ slightly.
Summary Spatial scale of processes is necessary information to design appropriate ecosystem research and management. In‐stream ecological processes are tightly linked with their adjacent terrestrial environment and impacted by modifications of riparian environments, particularly in small, forested streams. Quantitative understanding of how the dynamic coupling of these adjacent ecosystems varies along stream continua is necessary to enhance stream research and management. In temperate, forest‐do
In a long-term and a short-term study of 2 estuarine intertidal flats (sandy and muddy), sediment carbon contents were measured every 2 wk over 2.5 yr and daily for a 2 wk period, respectively. During the long-term study, current velocity was measured twice (for periods of 8 wk and 6 wk). During the short-term study, sediment traps were also deployed. In both tidal flats, sediment carbon content fluctuated but had no long-term trend, indicating dynamic equilibrium. Amplitude, period and mechanis
We compared effects of particulate organic matter (POM) transported from small rivers (POM R ) on chemical properties of sediment and diets of primary consumers in 3 estuarine tidal flats with different watershed characteristics in southwestern British Columbia, Canada. The source rivers (0.1 to 1.9 m 3 s -1 , annual mean) flowed through forested and urbanized areas (FR) or through agricultural areas (AG1 and AG2). The C:N ratio of POM R was significantly higher in FR (8.6 to 10.1) than in AG1 a
The study objective was to clarify how the growth stages of the Pacific oyster Crassostrea gigas affect selective suspension-feeding of particulate organic matter (POM) and the composition of biodeposits. A day-long (22 h), continuous-flow mesocosm experiment was conducted with 3, 15, and 27 mo old oysters. The suspended particulate matter (PM), settled PM (mostly biodeposits in the oyster mesocosms), and oyster soft tissues were analysed to determine the content of fatty acids, organic carbon,
Summary 1. The magnitude and spatial scales of human effects on stream habitats need to be correctly measured to achieve sound ecosystem management. We investigated whether the biogeochemical properties of fine particulate organic matter (FPOM) might be indicative of reach‐scale vs. catchment‐scale effects on forested stream ecosystems. 2. Along each of three forested streams, we established 4–5 sampling stations at 0·6–2·0‐km intervals, which represent a range of local riparian forest condition
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