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Search: authors:"Noboru Okuda"

5 papers found.
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Food web properties of the recently constructed, deep subtropical Fei-Tsui Reservoir in comparison with the ancient Lake Biwa

Using carbon and nitrogen stable isotope analysis, we characterised food web properties of the deep subtropical Fei-Tsui Reservoir (FTR), which was recently altered from a lotic to a lentic system after dam construction. In the littoral zone, zoobenthos showed strong reliance (83.9%) on benthic algal production. Zoobenthos were never found in the profundal zone because of anoxia. ...

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

Background 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 are also useful for comparative genomics in non-model organisms. Advances in genomics technologies make it more feasible than ever to study the genetics of adaptation in ...

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

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 still limited. In this study, we performed quantitative dietary analysis of different body sizes of goby (Gymnogobius isaza) specimens collected from Lake Biwa between 1962 and 2004. ...

Temporal variation in cyanobacteria species composition and photosynthetic activity in experimentally induced blooms

Temporal variation in the photosynthetic activity of bloom-forming cyanobacteria was evaluated by the maximum quantum yield of photosystem II (Fv/Fm) using a 3′-(3,4-dichlorophenyl)-1′, 1′-dimethyl urea (DCMU) methodology. To evaluate the Fv/Fm of cyanobacteria in phytoplankton communities containing several algal groups, phycocyanin was directly excited at 590 nm, and in vivo ...

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

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 interactions. However, whether (and how) intraspecific size-trophic relationships (i.e., trophic ontogeny pattern at the population level) vary with time remains poorly understood. Using ...