Noboru Okuda

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Biomagnification of trace elements in the aquatic food web in the Mekong Delta, South Vietnam using stable carbon and nitrogen isotope analysis.

Tokutaka Ikemoto, Nguyen Phuc Cam Tu, +5 authors Ichiro Takeuchi
Archives of environmental contamination and…
2008

In the present study, we report the concentrations of 21 trace elements (V, Cr, Mn, Co, Cu, Zn, As, Se, Rb, Sr, Mo, Ag, Cd, Sn, Sb, Cs, Ba, Hg, Tl, Pb, and Bi), as well as the results of the analysis… (More)

A RAD-based linkage map and comparative genomics in the gudgeons (genus Gnathopogon, Cyprinidae)

Ryo Kakioka, Tomoyuki Kokita, Hiroki Kumada, Katsutoshi Watanabe, Noboru Okuda
BMC Genomics
2012

The construction of linkage maps is a first step in exploring the genetic basis for adaptive phenotypic divergence in closely related species by quantitative trait locus (QTL) analysis. Linkage maps… (More)

Analysis of biomagnification of persistent organic pollutants in the aquatic food web of the Mekong Delta, South Vietnam using stable carbon and nitrogen isotopes.

Tokutaka Ikemoto, Nguyen Phuc Cam Tu, +5 authors Ichiro Takeuchi
Chemosphere
2008

The present study elucidated the biomagnification profiles of persistent organic pollutants (POPs) through a tropical aquatic food web of Vietnam based on trophic characterization using stable… (More)

Trophic polymorphism in bluegill sunfish (Lepomis macrochirus) introduced into Lake Biwa: evidence from stable isotope analysis

Kimiko Uchii, Noboru Okuda, Ryuji Yonekura, Zin’ichi Karube, Kazuaki Matsui, Zen’ichiro Kawabata
Limnology
2006

Trophic polymorphism was recently reported in introduced bluegill (Lepomis macrochirus) in Lake Biwa, Japan, where three morphs are specialized in benthic invertebrates (benthivorous type), submerged… (More)

Seasonal and site-specific variability in terrigenous particulate organic carbon concentration in near-shore waters of Lake Biwa, Japan

Yoichiro Sakai, Zin’ichi Karube, +5 authors Noboru Okuda
Limnology
2012

Identifying sources of particulate organic matter (POM) is important for clarifying fundamental mechanisms by which lake food webs are sustained. We determined carbon and nitrogen stable isotope… (More)

Grazing impact on the cyanobacterium Microcystis aeruginosa by the heterotrophic flagellate Collodictyon triciliatum in an experimental pond

Yuki Kobayashi, Yoshikuni Hodoki, Kako Ohbayashi, Noboru Okuda, Shin-Ichi Nakano
Limnology
2012

We estimated the grazing impact of the heterotrophic flagellate Collodictyon triciliatum on the harmful, bloom-forming cyanobacterium Microcystis aeruginosa in an experimental pond during a… (More)

Is the Relationship between Body Size and Trophic Niche Position Time-Invariant in a Predatory Fish? First Stable Isotope Evidence

Takefumi Nakazawa, Yoichiro Sakai, +4 authors Noboru Okuda
PloS one
2010

Characterizing relationships between individual body size and trophic niche position is essential for understanding how population and food-web dynamics are mediated by size-dependent trophic… (More)

Carbon and nitrogen stable isotope ratios of macroinvertebrates in the littoral zone of Lake Biwa as indicators of anthropogenic activities in the watershed

Zin’ichi Karube, Yoichiro Sakai, +5 authors Ichiro Tayasu
Ecological Research
2010

Carbon and nitrogen stable isotope ratios (δ13C and δ15N) of macroinvertebrates inhabiting littoral zones of lakes can serve as useful indicators of material loading from the watershed. We collected… (More)

Vertical heterogeneity of a forest floor invertebrate food web as indicated by stable-isotope analysis

Yutaka Okuzaki, Ichiro Tayasu, Noboru Okuda, Teiji Sota
Ecological Research
2009

Diverse populations of invertebrates constitute the food web in detritus layers of a forest floor. Heterogeneity in trophic interactions within such a species-rich community food web may affect the… (More)

Long-Term Changes in the Diet of Gymnogobius isaza from Lake Biwa, Japan: Effects of Body Size and Environmental Prey Availability

Jonathan Carlo Briones, Cheng-Han Tsai, +4 authors Noboru Okuda
PloS one
2012

Body size and environmental prey availability are both key factors determining feeding habits of gape-limited fish predators. However, our understanding of their interactive or relative effects is… (More)

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