Results 181 to 190 of about 3,801 (201)
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Non-carnivorous feeding in Arctic chaetognaths
Progress in Oceanography, 2020Abstract Chaetognaths (arrow worms) are important components of zooplankton communities in terms of abundance, biomass and contribution to carbon export. Though traditionally considered strict carnivores, recent studies have identified “omnivorous” chaetognaths. These may feed on non-animal materials, including algae, detritus or sediments.
Grigor, Jordan J. +5 more
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Multigene analysis of lophophorate and chaetognath phylogenetic relationships
Molecular Phylogenetics and Evolution, 2008Maximum likelihood and Bayesian inference analyses of seven concatenated fragments of nuclear-encoded housekeeping genes indicate that Lophotrochozoa is monophyletic, i.e., the lophophorate groups Bryozoa, Brachiopoda and Phoronida are more closely related to molluscs and annelids than to Deuterostomia or Ecdysozoa.
Martin, Helmkampf +2 more
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TEM Analyses of Chaetognath Reproductive Organs
2014Transmission electron microscopy (TEM) enables analysis of subcellular organization. It is especially useful for describing the diverse array of cell types in the gonads and embryos of marine invertebrates. Here, I describe methods for preserving and embedding the reproductive organs of marine arrow worms for TEM, including procedures for staining ...
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Pigments of meso- and bathypelagic chaetognaths
Marine Biology, 1977Pigments of the meso- and bathypelagic chaetognaths Sagitta macrocephala and Eukrohnia fowleri were studied by chromatographic analysis. Supplementary histological studies were also performed. Fat-soluble properties and absorption spectra of the chaetognath pigments indicated that all pigments were carotenoid, independent of chaetognath species or ...
M. Terazaki, R. Marumo, Y. Fujita
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1991
Abstract Chaetognaths, or arrow-worms, are voracious carnivores which are exceptionally abundant in all the seas of the world. It is highly likely that their vast numbers render them of major ecological significance in marine planktonic communities, yet very little is known of the group, largely because of the lack (until now) of easily ...
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Abstract Chaetognaths, or arrow-worms, are voracious carnivores which are exceptionally abundant in all the seas of the world. It is highly likely that their vast numbers render them of major ecological significance in marine planktonic communities, yet very little is known of the group, largely because of the lack (until now) of easily ...
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Immunohistochemistry of chaetognath body wall muscles
Invertebrate Biology, 2003Abstract. A light and electron immunohistochemical study was carried out on the body wall muscles of the chaetognath Sagitta friderici for the presence of a variety of contractile proteins (myosin, paramyosin, actin), regulatory proteins (tropomyosin, troponin), and structural proteins (α‐actinin, desmin, vimentin).
Mar Royuela +6 more
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Chaetognaths in Boka Kotorska Bay
Studia marina, 2014Temporal and spatial distribution of pelagic chaetognaths was studied at six stations in Boka Kotorska Bay from March 2009 to June 2010. This work present for the first time detailed information of the ecology of chaethognats in the specific ecosystem of Boka Kotorska Bay. Chaethognats were more numerous in Kotor Bay and Parasagitta setosa was dominant
Lučić, Davor, Hure, Marijana
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Chaetognaths of the Arabian Sea
1973During the IIOE (1959–1965) the Indian Ocean Biological Centre (IOBC) received 1927 Zooplankton samples, of which 1548 are standard ones (IOBC, 1969). Of these, 614 samples belong to the area extending from 10° S to 25° N lat. between 20° E and 80° E long. The chaetognaths identified from these 614 samples form the basis of the present study.
V. R. Nair, T. S. S. Rao
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Parasitism and Diseases In Chaetognaths
1991Abstract The early records of parasites from chaetognaths (reviewed by Hyman (1959) and Alvariiio (1965)) consist mainly of isolated descriptive observations. They include protozoans, nematodes, trematodes and cestodes. Dollfus (1960) catalogued all early records of digenetic trematodes from chaetognaths and attempted to classify them on
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The Tetrodotoxin Venom Of Chaetognaths
1991Abstract For many years it was suggested that chaetognaths paralysed their prey with a toxin before ingesting them. These suggestions were based on light microscopy observations (Burfield 1927; Kuhl 1938), observations of chaetognaths feeding in the laboratory (Parry 1944; Feigenbaum and Maris 1984; Nagasawa 1985c) and observations of ...
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