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《African Journal of Marine Science》2013,35(2):265-268
The collection of the barnacle Chirona (Striatobalanus) amaryllis (Darwin 1954) (Crustacea, Cirripedia) from the hull of a ship that had been operating for five months in the Gulf of Guinea and off Sierra Leone triggered a closer investigation of the cirriped fauna of the West African coast. Both C. amaryllis and Megabalanus coccopoma can now be added to the list of successful invasions in tropical West African waters. This discovery, as well as the circumstances of the findings, necessitates an update of the invertebrate faunal inventory of tropical West African marine waters. 相似文献
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Abstract Concentrations of cadmium (Cd), lead (Pb), copper (Cu), and zinc (Zn) were measured in adult barnacles (Elminius modestus Darwin) from Waitemata and Manukau Harbours in the Auckland area, New Zealand. As in studies on sediments reported in the literature, it was possible to identify areas of likely anthropogenic influence, e.g., around the Auckland Harbour Bridge for Pb, Cu, and Zn. Groups of individuals with highest concentrations for these metals showed 19.8–23.8 mg Pb kg?1, 198–266 mg Cu kg?1, and 4460–6530 mg Zn kg?1 (95% confidence limits, dry weight basis). Cd concentrations found for all barnacles from the Auckland area ranged from 0.8 to 3.1 mg kg?1. Two samples from Omaha Beach, 60 km north of Auckland, were used as a reference. Accordingly, groups of individuals with lowest concentrations for Pb, Cu, and Zn could be allocated to this site using the Student‐Newman‐Keuls Multiple Range Test (0.5–1.3 mg Pb kg?1, 8–10 mg Cu kg?1, and 144–214 mg Zn kg?1 ; 95% confidence limits). Only Cd concentrations were highest at Omaha Beach (8.6–12.1 mg Cd kg?1 ). This result may have arisen from “naturally” increased bio‐availabilities of certain metals in mangrove systems which are reported in the literature. Generally, metal concentrations in barnacles from the Auckland Harbour area and from Omaha Beach were within the wider range for E. modestus as well as other barnacle species reported in the international literature. 相似文献
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A new species of deep-water barnacle that belongs to the family Scalpellidae is described from the South China Sea. A rcoscalpellum liui sp. nov. is morphologically similar to A rcoscalpellum gryllum Zevina,but differs from the latter by the absence of longitudinal striae on the capitular plates and the presence of caudal appendages with few terminal setae. 相似文献
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Abstract. Direct evidence for interspecific competition between Tetrachthamalus oblitteratus and Tetraclita squamosa is provided. Tetrachthamalus oblitteratus is smothered and eliminated from the main midlittoral zone by encrusting Tetraclita. The disjunct distribution of Tetrachthamalus can be explained by elimination through competitive exclusion. 相似文献
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Extensive new material of scalpelliform cirripedes, including articulated individuals, from the Late Jurassic (Tithonian) Kimmeridge Clay of Dorset, southern England, is described and used as a basis for taxonomic revision of the family Zeugmatolepadidae. Two subfamilies, the Zeugmatolepadinae and Martillepadinae nov., are established and two new genera (Martillepas, Concinnalepas) in the latter subfamily are described from the Upper Jurassic and one (Icenilepas) from the Upper Cretaceous Chalk. Material from the Kimmeridge Clay of Dorset also includes the oldest fossil representative of the family Pollicipedidae for which a new genus and species, Etcheslepas durotrigensis, are erected, and the oldest calanticid, Cretiscalpellum sp. nov. Jurassic taxa established by T.H. Withers in 1928, on the basis of sparse material, are redescribed, and referred to the new genera as Martillepas ovalis, M. costata, M. hollisi, Concinnalepas concinna and Etcheslepas fragilis. 相似文献
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An abundant and diverse fauna of thoracican cirripedes is described on the basis of over 3000 isolated valves collected from a single lens of material representing in the order of a few thousand years of Campanian time (c. 80 Ma), from sediment formed on and close to a rocky shoreline at Ivö Klack in southern Sweden. At least twenty-eight species are present in the fauna, belonging to scalpelliform and basal sessile taxa. Two families (Myolepadidae and Titanolepadidae) and four genera are new (Myolepas, Bosquetlepas, Levelepas and Ivoelepas), as are seven species (Titanolepas spinifer, Levelepas roeperi, Ivoelepas nielseni, Arcoscalpellum scaniensis, Pollicipes vansyoci and P. (?) striatum). The palaeoecology is discussed with reference to extant cirripede faunas from rocky coastal environments. It is concluded that, although many taxa lived subtidally, the pollicipedids and pollicipedid-like forms (Capitulum, Pollicipes and Myolepas, respectively) lived in the intertidal zone, attached to rocks in a high-energy environment. Pachydiadema, a large basal balanomorph species, was adapted to living attached to boulders in the intertidal zone. The remarkable diversity significantly exceeds that of any known fossil thoracican assemblage, and is unknown in similar habitats at the present day, possibly challenging Darwin's famous quip that we currently live in the ‘Age of Barnacles’. 相似文献
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