Search results for "Systematics"

A validated bioenergetics model for ruffeGymnocephalus cernuusand its application to a northern lake

2008

A bioenergetics model was constructed for ruffe Gymnocephalus cernuus, and the model was used to estimate the food consumption of a native G. cernuus stock in Pyhajarvi, a large mesotrophic lake in south-west Finland. The parameters for the bioenergetics model were determined through laboratory experiments conducted at several temperatures between 5 and 22° C for different sized G. cernuus (from 6 to 27 g). The model was verified and validated with independent laboratory growth experiments. The validated model was applied to field data from Pyhajarvi to estimate the food consumption of G. cernuus and its effects on the zoobenthos community during the years 2002–2004. The total annual food c…

Survey of the parasitoids of the European Sunflower MothHomoeosoma nebulella [Lep.: Pyralidae] in the palearctic region

1993

The European Sunflower MothHomoeosoma nebulella Denis & Schiffermuller is a potential pest on sunflower in France. The parasitoids of this moth are little known. We present here original data obtained in the south of France together with previous survey. Some parasitoids we found were new records onH. nebulella. The relative weakness of the parasite complex ofH. nebulella (less than 15 species) compared to that of the American Sunflower MothH. electellum (Hulst) is discussed.

Numerical Taxonomy of Aeromonadaceae and Vibrionaceae associated with Reared Fish and Surrounding Fresh and Brackish Water

1995

Summary A numerical taxonomic study was performed on 51 isolates of gram-negative, oxidase-positive, rodshaped, heterotrophic, facultative anaerobic bacteria isolated from aquatic samples (fresh and brackish water, eels, turbot and rainbow trout). These bacteria were compared with 28 type and references strains which included most of Aeromonas phenospecies and DNA hybridization groups, as well as strains of some arginine-positive vibrios and Plesiomonas shigelloides . The strains were characterized by 137 morphological, biochemical, physiological and nutritional tests, and data were examined by simple matching (S SM ) and Jaccard (S J ) coefficients. Unweigthed pair group mathematical avera…

<strong>Seven new Spanish species of the genus <em>Synaldis</em> (Hymenoptera, Braconidae, Alysiinae) with mesoscutal pit</stron…

2014

Descriptions of seven new species of the alysiine genus Synaldis having mesoscutal pit from Spain are given: Synaldis berbegalae sp. nov., S. falcoi sp. nov., S. gilaberti sp. nov., S. jujisae sp. nov., S. lozanoae sp. nov., S. martinezae sp. nov., and S. navarroae sp. nov.

Sphingolipids and other constituents from Cordia platythyrsa

2005

A revision of Gynura (Asteraceae: Senecioneae)

2011

A revision of the paleotropical genus Gynura Cass. is presented. Forty-four species are recognized, of which three are described as new. These are G. daviesiae Vanijajiva & Kadereit, G. villosa Vanijajiva & Kadereit, and G. siamensis Vanijajiva & Kadereit. Gynura dissecta (F. G. Davies) Vanijajiva & Kadereit, G. annua (F. G. Davies) Vanijajiva & Kadereit, and G. aurantiaca (Bl.) DC. subsp. parviflora (F. G. Davies) Vanijajiva & Kadereit are new combinations. An identification key, descriptions, and distribution maps are provided.

<strong>Contributions to the Opiinae (Hymenoptera: Braconidae) of Eastern Iran with updated checklist of Iranian species</strong>

2014

The present work collects the checklist of species of Opiinae (Hymenoptera: Braconidae) from Iran and presents new information about the specimens captured in the Sistan and Baluchestan province during 2009–2011. A total of 68 species belonging to eight genera have been listed, of which nine species including Opius ( Hypocynodus ) arundinis Fischer, 1964a; Opius ( Hypocynodus ) bouceki (Fischer, 1958b); Opius ( Opius ) caricivorae Fischer, 1964b; Opius ( Opius ) exilis Haliday, 1837; Opius ( Opiothorax ) opacus Fischer, 1968; Opius ( Allophlebus ) tabificus Papp, 1979; Phaedrotoma biroica (Fischer et Beyarslan 2005a); Phaedrotoma mirabunda (Papp, 1982) and Xynobius rudis (Wesmaelm, 1835) ar…

Species diversity of the deep-water gulper sharks (Squaliformes: Centrophoridae:Centrophorus) in North Atlantic waters - current status and taxonomic…

2014

The gulper sharks (genus Centrophorus) are a group of deep-water benthopelagic sharks with a worldwide dis- tribution. The alpha taxonomy of the group has historically been problematic and the number of species included in the genus has varied considerably over the years and is still under debate. Gulper sharks are routinely caught in mid- and deep-water fisheries worldwide and some have shown a considerable decline in abundance in the last few decades. Clear and consistent species discrimination of Centrophorus is essential for an efficient and sustain- able management of these fisheries resources. Our study used molecular cytochrome oxidase subunit I (COI) and 16S ribosomal RNA gene seque…

Influence of lactose-citrate co-metabolism on the differences of growth and energetics in Leuconostoc lactis, Leuconostoc mesenteroides ssp. mesenter…

1999

International audience; The biodiversity of growth and energetics in Leuconostoc sp. has been studied in MRS lactose medium with and without citrate. On lactose alone, Ln. lactis has a growth rate double that of Ln. cremoris and Ln. mesenteroides. The pH is a more critical parameter for Ln. mesenteroides than for Ln. lactis or Ln. cremoris; without pH control Ln. mesenteroides is unable to acidify the medium under pH 4.5, while with pH control and as a consequence of a high Y(ATP) its growth is greater than Ln. lactis and Ln. cremoris. In general, lactose-citrate co-metabolism increases the growth rate, the biomass synthesis, the lactose utilisation ratio, and the production of lactate and …

Responses of co-occurring populations of Dendrobaena octaedra (Lumbricidae) and Cognettia sphagnetorum (Enchytraeidae) to soil pH, moisture and resou…

2000

Summary Dendrobaena octaedra (Lumbricidae) and Cognettia sphagnetorum (Enchytraeidae) are the two most dominating soil invertebrates in terms of biomass in boreal coniferous forest soils. A microcosm experiment was set up in order to study the influence of pH, moisture and resource addition on D. octaedra and C. sphagnetorum when both species are simultaneously present. Two kinds of coniferous forest humus were used as substrate, pine stand humus (pH 4.2), and spruce stand humus (pH 4.6); in the third treatment the pine stand humus was adjusted with slaked lime (CaOH 2 ) to the same initial pH as the spruce stand humus. Each substrate was adjusted to water contents of 25%, 42.5% and 60% of …