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  • interspecific hybridization  (2)
  • production  (2)
  • AWI_BioOce; Biological Oceanography @ AWI; Calculated; CN-analyser; DATE/TIME; Event label; Experimental treatment; German Bight, North Sea; HelgolandRoads_temora_longicornis_2016; Kabeltonne; Number of individuals; Replicate; Sampling; Temora longicornis, female, biomass as carbon per individual; Temora longicornis, female, biomass as nitrogen per individual; Temora longicornis, female, Carbon/Nitrogen ratio; Temora longicornis, female, dry mass per individual; Temora longicornis, females, biomass as carbon; Temora longicornis, females, biomass as nitrogen; Temora longicornis, females, dry mass  (1)
Document type
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Tail spine length in the Daphnia galeata complex: costs and benefits of induction by fish (1997)
    Springer
    Aquatic ecology 31 (1997), S. 89-98 
    Details
    ISSN: 1573-5125
    Keywords: fish predation ; inducible defence ; interspecific hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the combined effect of fish kairomones and food conditions on the relative tail spine length (RTL) of five Daphnia taxa, and the interaction of these factors with the vertical distribution of the daphnids. The experiment was done in two large-scale indoor containers, the so-called plankton towers in Plön, Germany. We conducted a competition experiment in which food level and the presence of fish chemicals and later fish were varied. A strong response of RTL to fish kairomones (e.g., longer tail spines), significant differences in RTL between species, but no differences in RTL with water depth were found. Further, we observed that these Daphnia taxa produced a higher RTL only under high food conditions. This suggests that there is a cost related to the production of longer tail spines. In a preliminary study in lake Plußsee, we found that Daphnia had longer average RTL than in the towers. Further, we noted significant differences in RTL between the two sampling dates, which may be related to a lower food level. We also detected a strong inverse correlation between RTL and depth. We discuss the implications of these findings for the co-existence of co-occurring Daphnia species and their hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009935100804
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Genetic markers, genealogies and biogeographic patterns in the cladocera (1998)
    Springer
    Aquatic ecology 32 (1998), S. 37-51 
    Details
    ISSN: 1573-5125
    Keywords: microcrustaceans ; Daphnia ; evolution ; interspecific hybridization ; molecular systematics ; aquatic ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cladoceran crustaceans are an important component of zooplankton in a wide range of freshwater habitats. Although the ecological characteristics of several cladoceran species have been well studied, biogeographical studies have been hampered by problematic taxonomic affiliations. However, recently developed molecular techniques, provide a powerful tool to subject aquatic taxa to comparative analyses. Here we highlight recent molecular approaches in aquatic ecology by presenting a simple method of DNA preparation and PCR amplification of the mitochondrial DNA (16S rDNA) in species from nine different families within the cladocera. On a broad taxonomic scale, sequence analysis of this mtDNA fragment has been used to produce the first molecular based phylogeny of the cladocera. This analysis clustered the cladoceran families in a fashion similar to that suggested by previous systematic classifications. In a more detailed analysis of the family Daphniidae, nuclear randomly amplified polymorphic DNA (RAPD), mitochondrial restriction fragment length polymorphism (RFLP) and morphological analyses were combined to identify species and interspecific hybrids within the Daphnia galeata species complex across 50 lakes in 13 European countries and one lake in Africa. The study revealed interspecific hybridization and backcrossing between some taxa (D. cucullata and D. galeata) to be widespread, and species and hybrids to frequently occur in sympatry. Genetic, as well as morphological information, suggests the occurrence of D. hyalina outside the Holarctic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009939901198
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Production biology of copepods and cladocerans in three south-east Sri Lankan low-land reservoirs and its comparison to other tropical freshwater bodies (1997)
    Springer
    Hydrobiologia 350 (1997), S. 145-162 
    Details
    ISSN: 1573-5117
    Keywords: microcrustacean zooplankton ; tropical limnology ; biomass ; production ; empirical relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Production, biomass and productivity of the microcrustacean zooplanktonpopulations of three low-land reservoirs, Tissawewa (eutrophic), Ridiyagama(moderately eutrophic), and Muruthawela (mesotrophic) in South-east SriLanka were studied. The temporal variation of zooplankton production wasstudied in Tissawewa on basis of fortnightly sampling on five fixed samplingstations for 2 years. Zooplankton production was relatively high, mainlybecause of high copepod production predominantly realised due to twocalanoid copepods, Phyllodiaptomus annae and Heliodiaptomus viduus. Abouthalf of the copepod production was contributed by the naupliar instarstages, whereas the contribution of the eggs was generally much smaller(〈20%). In contrast, the cladoceran production consisted for ca50–70% of egg production. The results of this study werecompared with those from more than twenty other tropical and subtropicalwaterbodies reported in the literature by deriving empirical relationshipsbetween mean phytoplankton biomass and mean zooplankton biomass andproduction. Mean zooplankton biomass and annual zooplankton production werefound to be positively related to mean phytoplankton biomass, and meanphytoplankton biomass proved to be a good predictor of mean zooplanktonbiomass (r2 = 0.58) and a moderate good predictor ofannual zooplankton production (r2 = 0.43). However,the relationships between the mean phytoplankton biomass and zooplankton P/Bwere not significant neither for small-bodied and large-bodied cladoceransnor for copepods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003035831790
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Seasonal variation in the interactions between piscivorous fish, planktivorous fish and zooplankton in a shallow eutrophic lake (1990)
    Springer
    Hydrobiologia 207 (1990), S. 279-286 
    Details
    ISSN: 1573-5117
    Keywords: food web ; trophic interactions ; production ; consumption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The interactions between the higher trophic levels in a shallow eutrophic lake were studied during the course of a year. Three fish species determined the main pathways of organic matter flow within the system: the predominantly planktivorous bream (Abramis brama), the obligate planktivorous smelt (Osmerus eperlanus), and the piscivorous pikeperch (Stizostedion lucioperca). Of the thirteen common zooplankton taxa Daphnia hyalina and cyclopoid copepods were utilized most by the planktivorous fish, while the large production of small cladocerans is almost left unutilized. The seasonal variations of production and consumption are large. This is mainly affected by seasonal variation of the water temperature. The production of O + smelt is efficiently utilized by the pikeperch. Being the most important zooplankton consumer, as well as the most important prey group, O + fish plays a key role in the Tjeukemeer food web.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041466
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    Paper (German National Licenses)
    Fulltext
  • 5
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    Unknown
    Carbon and nitrogen contents of Temora longicornis under different nutrient regimes (2018)
    PANGAEA
    Details
    Publication Date: 2023-07-06
    Keywords: AWI_BioOce; Biological Oceanography @ AWI; Calculated; CN-analyser; DATE/TIME; Event label; Experimental treatment; German Bight, North Sea; HelgolandRoads_temora_longicornis_2016; Kabeltonne; Number of individuals; Replicate; Sampling; Temora longicornis, female, biomass as carbon per individual; Temora longicornis, female, biomass as nitrogen per individual; Temora longicornis, female, Carbon/Nitrogen ratio; Temora longicornis, female, dry mass per individual; Temora longicornis, females, biomass as carbon; Temora longicornis, females, biomass as nitrogen; Temora longicornis, females, dry mass
    Type: Dataset
    Format: text/tab-separated-values, 767 data points
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    DATA PANGAEA
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