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  • 1
    Online Resource
    Online Resource
    Marine Macrophytes As Foundation Species. (2016)
    Portland :Taylor & Francis Group,
    Details
    Keywords: Aquatic plants. ; Marine habitats. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (286 pages)
    Edition: 1st ed.
    ISBN: 9781315353630
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5209764
    DDC: 581.76
    Language: English
    Note: Cover -- Half Title -- Title Page -- Copyright Page -- Prefeace -- Table of Contents -- I: Macroalgae and Seagrasses as a Source of Biodiversity -- 1: Microbial Biodiversity Associated with Marine Macroalgae and Seagrasses -- 2: The Role of Chemically Defended Seaweeds as Biodiversity Sources -- 3: Epibiont-Marine Macrophyte Assemblages -- 4: The Role of Floating Plants in Dispersal of Biota Across Habitats and Ecosystems -- 5: The Role of Drifting Algae for Marine Biodiversity -- II: Production of Macrophytes -- 6: Macrophyte Productivity and the Provisioning of Energy and Habitat to Nearshore Systems -- 7: Secondary Production -- III: Human Threats to Macrophytic Foundation Species -- 8: Eutrophication and the Challenge of Changing Biotic Interactions -- 9: Threats to Ecosystem Engineering Macrophytes: Climate Change -- 10: Ecological Interactions between Marine Plants and Alien Species -- 11: Physical Threats to Macrophytes as Ecosystem Engineers -- Index.
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  • 2
    Book
    Book
    Marine macrophytes as foundation species (2017)
    Boca Raton : CRC Press
    Details Availability
    Keywords: Aquatic plants ; Marine habitats ; Aufsatzsammlung ; Meeresökosystem ; Seetang ; Seegrasgewächse ; Mangrovengewächse ; Habitat
    Type of Medium: Book
    Pages: viii, 277 Seiten , Illustrationen
    ISBN: 9781498723244
    URL: https://external.dandelon.com/download/attachments/dandelon/ids/DE0060BFE58508A9DC777C12580960038ECFB.pdf
    DDC: 581.7/6
    Language: English
    Note: Includes bibliographical references and index
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of the deposit-feeding benthic bivalve Macoma balthica on meiobenthos (1993)
    Springer
    Oecologia 93 (1993), S. 457-462 
    Details
    ISSN: 1432-1939
    Keywords: Microcosm ; Meiofauna ; Macoma balthica ; Biological interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To evaluate the effects of a deposit-feeding bivalve on meiobenthic assemblage structure in muddy habitats, a laboratory experiment was performed at the Askö Laboratory in the northwestern Baltic proper. Microcosms, surface area 104 cm2, containing a c. 7-cm thick layer of sieved (0.5 mm) sublittoral mud were established in June 1990. Two months later the tellinid bivalve Macoma balthica was added in quantities varying from 0 to 40 individuals per microcosm. After 5 months the effects of the bivalves on the meiofauna were surprisingly small. The density of harpacticoid copepods was lowest (P 〈0.05) in microcosms containing a high density of M. balthica. It is suggested that competition for food resources was responsible for this pattern. For all other meiofaunal groups, including nematodes which were the most abundant taxon (99%), no significant differences (P〉0.05) were observed among treatments. The assemblage structure of the nematodes was similar between treatments. The vertical distribution of both major taxa and nematode species appeared to be unaffected by the presence of the bivalve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328952
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  • 4
    Electronic Resource
    Electronic Resource
    Small-scale spatial distribution of marine meiobenthos: the effects of decaying macrofauna (1992)
    Springer
    Oecologia 90 (1992), S. 37-42 
    Details
    ISSN: 1432-1939
    Keywords: Microcosm ; Small-scale spatial distribution ; Patch formation ; Decaying macrofauna ; Meiofauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To evaluate the effects of decaying animals on small-scale horizontal distribution of meiobenthos in muddy habitats, a laboratory experiment was performed at the Askö Laboratory in the northwestern Baltic Sea. A microcosm (35×55×28 cm) containing a ca. 7-cm thick layer of sieved (0.5 mm) sublittoral mud was established in June 1990. Three months later specimens of the bivalve Macoma balthica were collected and killed in boiling water. The sediment inside the microcosm was implanted with empty shell, empty shell and dead animal or left alone. At the end of the experiment (17 days) visual examination of the microcosm revealed black spots at the sediment surface where dead animals had been implanted. The densities of nematodes, the most abundant group (98%), were not significantly different between areas. However total non-nematode fauna was found in much lower numbers (P〈0.01) in the black spot areas. A multivariate analysis (detrended correspondence ordination) of nematode species abundance data separated samples from the black spot areas from the others. Of the 25 nematode species recorded in the microcosm, there was a significant difference between areas for four species. The decaying animals clearly attracted Monhystera disjuncta which was almost 6 times as abundant in the black spot areas compared to control and shell areas. Both the overall dominant species, Leptolaimus elegans and Calomicrolaimus honestus were found in lower numbers in the areas of dead Macoma than in control and shell areas. Sabatieria pulchra was found in lower numbers in the control areas compared to shell and dead animal areas. The overall structure of the nematode assemblage indicated a shift to lower dominance in the dead animal areas and it is speculated that decomposing animal tissue may be of primary importance regarding spatial distribution of meiobenthos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317806
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  • 5
    Electronic Resource
    Electronic Resource
    Meiobenthos in mangrove areas in eastern Africa with emphasis on assemblage structure of free-living marine nematodes (1995)
    Springer
    Hydrobiologia 312 (1995), S. 47-57 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A survey was conducted to examine spatial variations in the population density of major meiofaunal taxa and the assemblage structure of free-living marine nematodes within 5 mangrove areas on the west and east coast of Zanzibar. Meiofauna densities in surface sediments (0–5 cm) ranged from 205 to 5263 ind. 10 cm2, being on average 1493 ind. 10 cm2. Of the 17 major taxa recorded, nematodes dominated (64–99%) in all samples while harpacticoid copepods were usually second most abundant. Within all areas the numbers of meiofauna were very variable and significant differences among areas were only detected for oligochaetes and turbellarians. Densities of nematodes, harpacticoids, polychaetes and turbellarians were, however, significantly (P〈0.001) higher at low water stations compared with mid and high water stations. Harpacticoids were negatively correlated with the numbers of fiddler crab (Uca spp.) burrows. Other correlations between environmental factors (grain size, temperature, salinity, oxygen tension, prop root density, fiddler crab burrows) and major meiofaunal taxa were non-significant. A total of 94 nematode genera were recorded from four mangrove areas. The most abundant and frequent genera were Microlaimus and Spirinia, followed by Desmodora and Metachromadora. Representatives of the genera most common in current study are found all over the globe. There was a high variation in nematode assemblage structure within and between sampling areas indicating the absence of a well defined nematode assemblage confined to mangrove areas. In a hypersaline area diversity was much reduced and where salinity was over 100%. the fauna was restricted to 3 nematode genera, Microlaimus, Theristus and Bathylaimus. Multidimensional scaling ordination (MDS) of the nematode genera separated samples taken from low water stations from other stations, the assemblage structure being significantly different at the low water stations. Numbers of selective deposit feeders were negatively correlated with average grain size and positively correlated with silt content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018886
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  • 6
    Electronic Resource
    Electronic Resource
    Soft-bottom fauna with emphasis on nematode assemblage structure in a tropical intertidal lagoon in Zanzibar, eastern Africa: I. spatial variability (1999)
    Springer
    Hydrobiologia 405 (1999), S. 133-148 
    Details
    ISSN: 1573-5117
    Keywords: Soft-bottom ; macrofauna ; meiofauna ; Nematoda ; tropical lagoon ; spatial distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Twenty stations were sampled in a reef-protected lagoon on the east coast of Zanzibar from a variety of habitats: seagrass beds, fine sand, bare medium sand and coarse sand. Total meiofauna densities ranged from 219 to 3422 ind./10 cm2. Stations in the upper lagoon (〈 400 m from shore) had relatively higher densities of meiofauna than those of other habitats, apart from seagrass beds. Of the 12 major taxa recorded, Nematoda normally was the most abundant taxon, contributing between 13% and 97% of total fauna, followed by Harpacticoida, Polychaeta and Turbellaria. Nematodes were dominated by epistrate feeders in all habitat-types and altogether 100 nematode genera were found within the lagoon. Clear nematode assemblage structures were depicted by non-metric multidimensional scaling ordination in seagrass bed, fine sand and coarse sand habitats. On a larger scale, sediment characteristics seem to determine the gross assemblage structure. Samples from the same station were more similar in terms of generic occurrence and population structure than samples from different stations in similar habitats. This indicates that there are localised factors influencing the nematode populations on a small scale in each habitat-type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003874122971
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  • 7
    Electronic Resource
    Electronic Resource
    Meiobenthos of hypersaline tropical mangrove sediment in relation to spring tide inundation (2000)
    Springer
    Hydrobiologia 426 (2000), S. 57-64 
    Details
    ISSN: 1573-5117
    Keywords: hypersaline ; mangrove ; tidal cycles ; meiofauna ; nematode assemblage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tropical intertidal sediments often contain porewater of relatively high salinity, especially in areas exposed to longer periods without seawater inundation and high evaporation. Such an area exists on the west coast of Zanzibar: a high intertidal mangrove plateau, flooded only during spring high tides, with sediment porewater salinities commonly exceeding 100 ppt. A field survey was conducted in this area to examine variations in population density of major meiofaunal taxa and the assemblage structure of free-living marine nematodes during spring-neap tidal cycles. Samples were taken on seven occasions for two months, starting from the end of the rainy season. Porewater salinity remained high throughout the sampling period, ranging from 89 to 160 ppt. Neither spring tide inundation nor heavy rains lowered the salinity markedly. The meiofauna consisted only of four taxa, present on all sampling occasions: nematodes, harpacticoid copepods, plathyhelminthes and chironomids. Densities in surface sediments (0–5 cm) were low compared to other mangrove areas, ranging from 271 to 656 animals 10 cm-2 with nematodes dominant on all sampling occasions (58–87%). Density fluctuations could not be explained by the effects of spring tide inundation, but the meiofauna showed significant correlations with grain size and organic material. Despite the wide range of salinity, only the numbers of chironomids were negatively correlated with increased salinity. Nematode species diversity was low in all samples, although altogether 28 species were recorded in the samples. Four species occurred in more than 50% of the samples (Microlaimus sp. (100%), Metalinhomoeus sp. (76%), Daptonema sp.l (56%), Chromadorina sp. (56%)) while 12 species were found only in one or two samples. Multidimensional scaling ordination (MDS) of the nematode species abundance data indicated little effects of spring tide inundation on the assemblage structure, but rather a successive change from wet to dry season with a reduction in species diversity and increased numbers of the dominant nematode species Microlaimus sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003992211656
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  • 8
    Electronic Resource
    Electronic Resource
    Reef fish assemblages in north-western Sri Lanka: distribution patterns and influences of fishing practises (1997)
    Springer
    Environmental biology of fishes 49 (1997), S. 45-61 
    Details
    ISSN: 1573-5133
    Keywords: habitat structure ; habitat partitioning ; sandstone reef ; coral reef ; fish community ; zonation ; human disturbance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and abundance of reef fishes in relation to habitat structure were studied within Bar Reef Marine Sanctuary (BRMS) and on an adjacent reef, disturbed by destructive fishing techniques, in north-western Sri Lanka, by visually censusing 135 species groups using fifty metre belt-transects. Two types of continental shelf patch-reefs are found in the study area: coral reefs and sandstone reefs, which are divided into distinct habitats, four for the coral reef (shallow reef flat, shallow patch reef, deep reef flat and Porites domes) and two for the sandstone reef (structured sandstone-reef and flat sandstone-reef). Fish assemblages varied in structure between reef types and among habitats within reef types. Functional aspects of habitat structure and composition, such as available food and shelter, seemed to be important factors influencing distribution patterns. The strongest separation in the organisation of fish assemblages in BRMS was between reef types: 19% of all species were confined to the coral-reef patches while 22% were restricted to the sandstone reef patches and 59% were represented on both reef types. In terms of distribution among habitats, 21% of all species were restricted to one habitat while only 1.5% were present in all. The highest density of fish was in the coral reef habitats while highest species diversity was found in the most structurally complex habitat: the structured sandstone-reef. This habitat also had the highest proportion of species with restricted distribution. Planktivores were the most abundant trophic group in BRMS, and the species composition of the group varied among habitats. The comparison of the disturbed reef with BRMS suggested that habitat alteration caused by destructive fishing methods has strongly influenced the fish community. Within the fished area the structure of the fish assemblages was more heterogeneous, fish abundance was lower by an order of magnitude and species numbers were lower than in BRMS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007309230416
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