Abstract Species in the cyclopoid copepod Triconia are known to be bioluminescent, emitting blue light by mechanical stimulus. In this study Triconica conifera , we identified presence of luciferase activity coelenterazine, a substrate for bioluminescence various marine taxa such as luminous cnidarians, fishes, and crustaceans including calanoid copepods. The molecular size estimated gel‐filtration chromatography pH dependency were similar those On other hand, reaction rate inhibitory effect...

Abstract We examined the degradation of discarded appendicularian houses due to feeding by oncaeid copepods in surface waters Kuroshio region. Vertical distributions and were investigated optical sampling using a video plankton recorder (VPR). In situ VPR observations revealed that commonly associated with houses: proportion individuals attached reached saturated values 25‐39% at house concentrations above 2000 m −3 , suggesting oncaeids was not limited encounters typically observed upper 50...

Spatial distribution and the diet composition of Asplanchna species were studied in 18 water bodies Matsuyama, Japan. The abundance other rotifers, crustaceans, phytoplankton microbial plankton, together with basic environmental parameters, determined between October December 2006, estimated. Three Asplanchna, A. herricki, priodonta girodi found present study, but herricki was rather less abundant than two species. Their different among species, showing that consumed only particulate matter...

Onboard incubation experiments were conducted to examine the feeding rates and selectivity of cyclopoid copepod Oithona similis on natural assemblages microplankton during spring bloom in Oyashio region. O. cleared ciliates at higher (2.8–11.9 mL copepod−1 d−1) than dinoflagellates (1.4 d−1), with no detectable ingestion diatoms. Clearance increased ciliate size, reaching maximum a size ~35 μm equivalent spherical diameter. The total protozooplankton (ciliates dinoflagellates) by ranged...

Community structure and vertical distribution of oncaeid copepods were investigated at an offshore site in Tosa Bay, southern Japan. Samples collected with a 0.063 mm closing type net from eight discrete layers between the surface 500 m depth August November 2005. A total 45 species three form variants belonging to genera Triconia, Oncaea, Spinoncaea, Conaea Epicalymma identified. The greatest number was consistently found lower epipelagic zone, 50–100 m. patterns similar November, highest...

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 25:259-270 (2001) - doi:10.3354/ame025259 Trophic linkage among heterotrophic nanoflagellates, ciliates and metazoan zooplankton in a hypereutrophic pond Shin-ichi Nakano1,*, Pathmalal M. Manage1, Yuichiro Nishibe1, Zen¹ichiro Kawabata2 1Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 3, Matsuyama...

Abstract Most studies on the feeding ecology of larvae and juveniles commercially important pelagic fishes have used field-based approaches. However, due to possible biases related net sampling, it is uncertain whether results obtained from those truly represent situation live fish in sea. Here we investigated through a laboratory experiment minimizing inherent field sampling. In experiment, hatchery-reared juvenile chub mackerel ( Scomber japonicus ) larval/juvenile Japanese anchovy...

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 29:173-179 (2002) - doi:10.3354/ame029173 Grazing on Microcystis aeruginosa by heterotrophic flagellate Collodictyon triciliatum in a hypertrophic pond Yuichiro Nishibe1,*, Zen¹ichiro Kawabata2, Shin-ichi Nakano1 1Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 3, Matsuyama, 790-8577, Japan 2Center...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 353:107-113 (2008) - DOI: https://doi.org/10.3354/meps07202 Attached microalgae contribute planktonic food webs in bays with fish and pearl oyster farms Hideyuki Doi1,*, Kwang-Hyeon Chang2, Yumiko Obayashi2, Mizuho Yoshihara1, Mary Shime1, Takako Yamamoto1, Yuichiro Nishibe2, Shin-ichi Nakano1 1LAFWEDY,...

We determined trophic niche breadths of three dominant Neocalanus species using δ13C–δ15N variation among individuals. Trophic differed the congeneric copepods, depending on their body size and feeding habits.

Abstract To understand the spatio‐temporal dynamics of juvenile chum salmon Oncorhynchus keta and their zooplankton prey, neritic Pseudocalanus newmani , oceanic Eucalanus bungii Themisto japonica we developed species‐specific environmental DNA (eDNA) quantification methods. First, confirmed that collected in Otsuchi Bay preyed on target by stomach contents analyses using assays. Size‐fraction water bay showed P. E. were derived mostly from nauplii early copepodids. We then investigated...

The importance of analyzing the determinants biodiversity and community composition by using multiple trophic levels is well recognized; however, relevant data are lacking. In present study, we investigated variations in species diversity indices structures plankton taxonomic groups–zooplankton, rotifers, ciliates, phytoplankton–under a range local environmental factors pond ecosystems. For each planktonic group, estimated index linear models analyzed structure canonical correspondence...

Abstract Despite ecological importance, the feeding ecology of large calanoid copepod, Neocalanus cristatus is little known, as its ingestion rate under experimental conditions consistently falls short metabolic demand. The conventional incubation bottle size (~ 2 liters) used in previous studies may have affected behavior. Here, we examined effect (2.4 vs. 13liters) and copepod density on N. Stage C5. Under similar (0.4 ind. L −1 ) rates decreased significantly for tests conducted small...