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Digitale Medien

Tail spine length in the Daphnia galeata complex: costs and benefits of induction by fish (1997)

Spaak, Piet ; Boersma, Maarten

Springer

Aquatic ecology 31 (1997), S. 89-98

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ISSN: 1573-5125

Schlagwort(e): fish predation ; inducible defence ; interspecific hybridization

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1009935100804

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Digitale Medien

Genetic markers, genealogies and biogeographic patterns in the cladocera (1998)

Schwenk, Klaus ; Sand, Anna ; Boersma, Maarten ; [weitere]

Springer

Aquatic ecology 32 (1998), S. 37-51

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ISSN: 1573-5125

Schlagwort(e): microcrustaceans ; Daphnia ; evolution ; interspecific hybridization ; molecular systematics ; aquatic ecology

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1009939901198

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Carbon and nitrogen contents of Temora longicornis under different nutrient regimes (2018)

Franco-Santos, Rita Melo ; Auel, Holger ; Boersma, Maarten ; [weitere]

PANGAEA

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Publikationsdatum: 2023-07-06

Schlagwort(e): 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

Materialart: Dataset

Format: text/tab-separated-values, 767 data points

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