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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 33 (1995), S. 0 
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In situ enclosure experiments were performed in the mesotrophic Bermejales reservoir to evaluate the algal response to changes in the nutrient supply and in the zooplankton size structure and density in a 2 × 2 factorial design. The experiments were conducted during the spring bloom of nanoplanktonic diatoms in 1989.2. Nutrient enrichment promoted a great increase of phytoplankton biomass indicating a strong nutrient limitation on phytoplankton growth. Total phytoplankton biomass was significantly lower in the Daphina-added enclosures at a given nutrient level and strong direct an indirect effect of zooplankton on phytoplankton community structure and nutrient availability were observed.3. Most of the nanoplanktonic species were effectively grazed but species with protective coverings and large size colonies were favoured by grazers and small chlorococcales were unaffected probably because of their compensatory high growth rates. The decrease in total biomass imposed by grazers is attributable mainly to the decrease of Cyclotella ocellata, the most abundant species. This taxon suffers two net effects of zooplankton: direct grazing and the indirect decrease of Si availability caused by the growth of C. ocellata which was promoted by P excretion by zooplankton. Indirect effects of grazers on Si availability should, therefore, be taken into account in explaining phytoplankton succession and community structure.4. In this experiment grazers affected considerably the nanoplanktonic community in Bermejales reservoir. The extent which they were affected, however, depended not only on the algal size as a determinant of edibility but also greatly on the specific nutrient requirements and taxonomic features of the algal species.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5117
    Keywords: phosphorus ; nutrient ; regeneration ; Daphnia ; herbivores ; phytoplankton ; P-demand ; primary production ; Lake Vechten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data on phosphate excretion rates of zooplankton are based on measurements using the pelagic crustacean zooplankton of Lake Vechten and laboratory-cultured Daphnia galeata. In case of Daphnia sp we measured the effects of feeding on P-rich algae and P-poor algae (Scenedesmus) as food on the P-excretion rates at 20°C. The excretion rates of the natural zooplankton community, irrespective of the influence of the factors mentioned, varied by an order of magnitude: 0.025–0.275µg PO4-Pmg−1C in zooplankton (C zp ) h−1. The temperature accounted for about half the observed variation in excretion rates. The mean excretion rates in the lake, computed for 20°C, varied between 0.141 and 0.260 µg Pmg−1C zp h−1. Based on data of zooplankton biomass in the lake the P-regeneration rates by zooplankton covered between 22 and 239% of the P-demand of phytoplankton during the different months of the study period. In D. galeata, whereas the C/P ratios of the Scenedesmus used as food differed by a factor 5 in the experiments, the excretion rates differed by factor 3 only. Despite the higher P-excretion rates (0.258± 0.022 µg PO4-P mg−1 C h−1) of the daphnids fed with P-rich food than those fed with P-poor food (0.105 ± 0.047 µg PO4-P mg−1 C hp−1), both the categories of the animals were apparently conserving P. A survey of the literature on zooplankton excretion shows that in Daphnia the excretion rates vary by a factor 30, irrespective of the species and size of animals and method of estimation and temperature used. About two-thirds of this variation can be explained by size and temperature. A major problem of comparability of studies on P-regeneration by zooplankton relates to the existing techniques of P determination, which necessitates concentrating the animals several times above the in situ concentration (crowding) and prolonged experimental duration (starving), both of which manifest in marked changes that probably lead to underestimation of the ‘real’ rates.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 391 (1998), S. 147-155 
    ISSN: 1573-5117
    Keywords: N and P release rates ; Daphnia ; Scenedesmus ; species-specific effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bioavailable N and P release rates by juveniles and adults of three Daphnia taxa (D. hyalina, D. galeata and its interspecific hybrids D. hyalina × galeata) were measured to assess the effect of weight and interspecific differences on these rates in Daphnia. Immobilized Scenedesmus obliquus cells were used to estimate the release rates. The specific release rate of N varied between 5.19–5.71 μg N mg C-1 h-1 for juveniles and 3.00–3.42 μg N mg C-1 h-1 for adults. P excretion rate ranged between 1.93–2.37 μg P mg C-1 h-1 for juveniles and 1.00–1.24 μg P mg C-1 h-1 for adults. Our results show that the taxonomic affiliation of Daphnia individuals did not affect their N and P release rates.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2023-12-23
    Keywords: Achnanthidium minutissimum; Achnanthidium saprophilum; Achnanthidium sp.; Achnanthidium subatomoides; Adlafia minuscula; Adlafia minuscula var. muralis; Adlafia suchlandtii; Age; Aguas_Verdes_2011; Amphora copulata; Aulacoseira alpigena; Brachysira brebissonii; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis bacillum; Caloneis silicula; Cavinula cocconeiformis; Cavinula pseudoscutiformis; Chamaepinnularia mediocris; Common Era; Cymbopleura naviculiformis; DEPTH, sediment/rock; Diadesmis perpusilla; Diatoma hyemalis; Diatoma mesodon; diatom communiy composition; Encyonema minutum; Encyonema perpusillum; Encyonema silesiacum; Encyonema spp.; Eolimna minima; Eunotia bilunaris; Eunotia diodon; Eunotia incisa; Eunotia minor; Eunotia subarcuatoides; Eunotia tenella; Fragilaria capucina; Fragilaria pararumpens; Fragilaria recapitellata; Geissleria acceptata; Gomphonema affine; Gomphonema clavatum; Gomphonema exilissimum; Gomphonema gracile; Gomphonema parvulum; Lake Aguas Verdes, Sierra Nevada, Spain; Lake core; Mayamaea atomus; Mayamaea permitis; Meridion circulare; Meridion constrictum; Navicula cryptocephala; Navicula cryptotenella; Naviculadicta elorantana; Naviculadicta seminulum; Navicula radiosa; Navicula sp.; Navicula tridentula; Neidium affine; Nitzschia alpina; Nitzschia graciliformis; Nitzschia gracilis; Nitzschia hantzschiana; Nitzschia palea; Pinnularia brebissonii var. minuta; Pinnularia divergentissima; Pinnularia maior; Pinnularia microstauron; Pinnularia perirrorata; Pinnularia pseudacuminata; Pinnularia sinistra; Pinnularia subcapitata; Planothidium frequentissimum; Planothidium lanceolatum; Planothidium sp.; Psammothidium altaicum; Psammothidium curtissimum; Psammothidium helveticum; Psammothidium levanderi; Psammothidium marginulatum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Pseudostaurosira parasitica; Relative abundance (counted and calculated); Rossithidium pusillum; Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroforma exiguiformis; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis smithii; Staurosira pinnata; Staurosira pseudoconstruens; Staurosira sp.; Staurosira venter; Surirella angusta; Tabellaria flocculosa var. flocculosa
    Type: Dataset
    Format: text/tab-separated-values, 2678 data points
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  • 5
    Publication Date: 2023-12-23
    Keywords: Achnanthidium minutissimum; Adlafia minuscula; Adlafia suchlandtii; Age; Aulacoseira alpigena; Borreguil_2011; Brachysira brebissonii; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis bacillum; Caloneis silicula; Caloneis sp.; Chamaepinnularia mediocris; Common Era; Craticula buderi; Craticula molestiformis; Cymbopleura naviculiformis; DEPTH, sediment/rock; Diatoma mesodon; diatom communiy composition; Encyonema lange-bertalotii; Encyonema neogracile; Encyonema perpusillum; Encyonema silesiacum; Encyonema sp.; Eolimna minima; Eunotia arcus; Eunotia bilunaris; Eunotia diodon; Eunotia glacialis; Eunotia implicata; Eunotia incisa; Eunotia intermedia; Eunotia minor; Eunotia sp.; Eunotia subarcuatoides; Eunotia tenella; Fragilaria capucina; Fragilaria heidenii var. nevadensis; Fragilaria rumpens; Fragilaria virescens; Frustulia crassinervia; Gomphonema affine; Gomphonema clavatum; Gomphonema exilissimum; Gomphonema gracile; Gomphonema parvulum; Hantzschia amphioxys; Lake Borreguil, Sierra Nevada, Spain; Lake core; Luticola goeppertiana; Meridion constrictum; Naviculadicta elorantana; Naviculadicta seminulum; Navicula sp.; Neidiopsis levanderi; Neidium affine; Neidium ampliatum; Neidium sp.; Nitzschia acidoclinata; Nitzschia alpina; Nitzschia graciliformis; Nitzschia gracilis; Nitzschia hantzschiana; Nitzschia sp.; Pinnularia borealis f. rectangularis; Pinnularia brebissonii var. minuta; Pinnularia maior; Pinnularia microstauron; Pinnularia perirrorata; Pinnularia pseudacuminata; Pinnularia sinistra; Pinnularia sp.; Pinnularia subcapitata; Planothidium frequentissimum; Planothidium lanceolatum; Psammothidium altaicum; Psammothidium curtissimum; Psammothidium daonense; Psammothidium helveticum; Psammothidium levanderi; Psammothidium marginulatum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Relative abundance (counted and calculated); Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroforma exiguiformis; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis smithii; Staurosira pinnata; Staurosira pseudoconstruens; Staurosira venter; Staurosirella leptostauron; Staurosirella pinnata var. trigona; Surirella tenera; Tabellaria flocculosa var. flocculosa
    Type: Dataset
    Format: text/tab-separated-values, 2769 data points
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  • 6
    Publication Date: 2023-12-23
    Keywords: Achnanthidium minutissimum; Adlafia minuscula; Adlafia suchlandtii; Age; Amphora copulata; Amphora indistincta; Amphora pediculus; Aulacoseira alpigena; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis silicula; Cavinula pseudoscutiformis; Cocconeis euglypta; Common Era; Cymbopleura naviculiformis; DEPTH, sediment/rock; Diadesmis gallica; diatom communiy composition; Encyonema lange-bertalotii; Encyonema minutum; Encyonema reichardtii; Encyonema silesiacum; Encyonema sp.; Encyonopsis subminuta; Eolimna minima; Eunotia bilunaris; Eunotia minor; Fragilaria capucina; Fragilaria pararumpens; Fragilaria recapitellata; Fragilaria tenera; Fragilaria vaucheriae; Geissleria acceptata; Gomphonema exilissimum; Gomphonema gracile; Gomphonema parvulum; Lake core; Lake Mosca, Sierra Nevada, Spain; Luticola nivalis; Luticola paramutica; Mayamaea permitis; Meridion circulare; Mosca_2011; Navicula cryptocephala; Navicula radiosa; Navicula sp.; Neidium affine; Nitzschia acidoclinata; Nitzschia alpina; Nitzschia fonticola; Nitzschia hantzschiana; Nitzschia sp.; Pinnularia brebissonii; Pinnularia brebissonii var. minuta; Pinnularia maior; Pinnularia microstauron; Pinnularia pseudacuminata; Pinnularia sinistra; Pinnularia subcapitata; Psammothidium curtissimum; Psammothidium helveticum; Psammothidium levanderi; Psammothidium marginulatum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Relative abundance (counted and calculated); Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroneis smithii; Staurosira pinnata; Staurosira pseudoconstruens; Staurosira venter
    Type: Dataset
    Format: text/tab-separated-values, 1705 data points
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  • 7
    Publication Date: 2023-12-23
    Keywords: Achnanthes johncarteri; Achnanthes sp.; Achnanthidium minutissimum; Adlafia minuscula; Adlafia suchlandtii; Age; Amphora copulata; Aulacoseira alpigena; Brachysira brebissonii; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis bacillum; Caloneis lauta; Caloneis silicula; Cavinula cocconeiformis; Chamaepinnularia mediocris; Common Era; Craticula buderi; Cyclotella ocellata; Cymbopleura naviculiformis; DEPTH, sediment/rock; diatom communiy composition; Diatoms, other; Encyonema perpusillum; Encyonema silesiacum; Eolimna minima; Eunotia bilunaris; Eunotia diodon; Eunotia glacialis; Eunotia incisa; Eunotia pseudopectinalis; Eunotia tenella; Fragilaria pararumpens; Fragilaria virescens; Frustulia rhomboides sensu lato; Geissleria schoenfeldii; Gomphonema clavatum; Gomphonema gracile; Gomphonema parvulum var. exilissimum; Lake core; Lake Río Seco, Sierra Nevada, Spain; Luticula acidoclinata; Melosira sp.; Navicula cryptocephala; Naviculadicta elorantana; Naviculadicta seminulum; Naviculadicta stauroneioides; Navicula pusio; Navicula sp.; Neidiopsis levanderi; Neidium affine; Neidium ampliatum; Nitzschia alpina; Nitzschia gracilis; Pinnularia borealis f. rectangularis; Pinnularia divergens; Pinnularia divergentissima; Pinnularia julma; Pinnularia maior; Pinnularia microstauron; Pinnularia perirrorata; Pinnularia sinistra; Pinnularia sp.; Pinnularia viridis; Psammothidium altaicum; Psammothidium curtissimum; Psammothidium helveticum; Psammothidium marginulatum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Relative abundance (counted and calculated); Rio_Seco_2008; Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroforma exiguiformis; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis smithii; Staurosira pinnata; Staurosira venter; Stenopterobia delicatissima; Surirella angusta; Surirella grande; Surirella lapponica; Surirella linearis var. linearis; Tabellaria flocculosa var. flocculosa
    Type: Dataset
    Format: text/tab-separated-values, 2624 data points
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  • 8
    Publication Date: 2023-12-23
    Keywords: Achnanthidium minutissimum; Achnanthidium sp.; Adlafia bryophila; Adlafia minuscula; Adlafia minuscula var. muralis; Adlafia sp.; Adlafia suchlandtii; Age; Aulacoseira alpigena; Aulacoseira ambigua; Aulacoseira sp.; Brachysira sp.; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis bacillum; Caloneis silicula; Caloneis sp.; Common Era; Cyclotella ocellata; Cyclotella sp.; Cymbopleura naviculiformis; DEPTH, sediment/rock; Diadesmis gallica; Diadesmis perpusilla; diatom communiy composition; Encyonema minutum; Encyonema silesiacum; Encyonema sp.; Eolimna minima; Eunotia sp.; Fistulifera saprophila; Fragilaria pararumpens; Fragilaria rumpens; Geissleria schoenfeldii; Gomphonema acuminatum; Gomphonema exilissimum; Gomphonema gracile; Gomphonema parvulum; Hantzschia amphioxys; Lake core; Lake Río Seco, Sierra Nevada, Spain; Luticola goeppertiana; Mayamaea permitis; Meridion constrictum; Navicula cryptocephala; Navicula cryptotenella; Naviculadicta seminulum; Navicula sp.; Neidium affine; Neidium silicula; Neidium sp.; Nitzschia acidoclinata; Nitzschia hantzschiana; Nitzschia palea; Nitzschia perminuta; Nitzschia sp.; Pinnularia brebissonii var. minuta; Pinnularia divergentissima; Pinnularia microstauron; Pinnularia pseudacuminata; Pinnularia sinistra; Pinnularia sp.; Pinnularia subcapitata; Pinnularia viridis; Planothidium frequentissimum; Planothidium lanceolatum; Planothidium sp.; Psammothidium curtissimum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Pseudostaurosira spp.; Relative abundance (counted and calculated); Rio_Seco_Superior_2011; Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroforma exiguiformis; Stauroneis smithii; Staurosira construens var. binodis; Staurosira pinnata; Staurosira sp.; Staurosira venter; Stephanodiscus spp.; Surirella tenera; Tabellaria flocculosa var. flocculosa
    Type: Dataset
    Format: text/tab-separated-values, 2370 data points
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  • 9
    Publication Date: 2023-12-23
    Keywords: Achnanthidium latecephalum; Achnanthidium pyrenaicum; Achnanthidium sp.; Adlafia minuscula; Age; Aulacoseira alpigena; Aulacoseira sp.; Calculated from 210Pb dating according to the Constant Rate of Supply (CRS) method; Caloneis lauta; Caloneis silicula; Common Era; Craticula buderi; Craticula sp.; Craticula vixnegligenda; Cuadrada_2011; Cyclotella ocellata; DEPTH, sediment/rock; Diatoma mesodon; diatom communiy composition; Encyonema minutisimum; Encyonema neogracile; Encyonema silesiacum; Eolimna minima; Epithemia adnata; Eunotia bilunaris; Eunotia diodon; Eunotia glacialis; Eunotia minor; Eunotia praerupta; Eunotia sp.; Fistulifera saprophila; Fragilaria bidens; Fragilaria capucina; Fragilaria nevadensis; Fragilaria rumpens; Fragilaria sp.; Gomphonema exilissimum; Gomphonema gracile; Gomphonema parvulum; Gomphonema pseudoaugur; Gomphonema sp.; Hantzschia abundans; Lake core; Lake Cuadrada, Sierra Nevada, Spain; Navicula cryptocephala; Navicula cryptotenella; Navicula sp.; Neidium affine; Neidium bisulcatum; Neidium sp.; Nitzschia alpina; Nitzschia graciliformis; Nitzschia perminuta; Nitzschia sp.; Pinnularia borealis var. borealis; Pinnularia brebissonii var. minuta; Pinnularia interrupta; Pinnularia maior; Pinnularia microstauron; Pinnularia obscura; Pinnularia pseudacuminata; Pinnularia sp.; Psammothidium curtissimum; Psammothidium helveticum; Psammothidium subatomoides; Pseudostaurosira brevistriata; Relative abundance (counted and calculated); Sample code/label; Sediment core; Sellaphora pupula; Sierra Nevada (Spain); Slide-hammer gravity corer; Stauroforma exiguiformis; Stauroforma sp.; Stauroneis anceps; Staurosira pinnata; Staurosira venter; Stenopterobia delicatissima; Stephanodiscus sp.; Surirella angusta; Surirella bohemica; Surirella linearis; Surirella sp.; Surirella tenera; Synedra sp.; Tabellaria flocculosa var. flocculosa
    Type: Dataset
    Format: text/tab-separated-values, 2736 data points
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  • 10
    Publication Date: 2023-12-20
    Description: This dataset includes the fractional abundances of the long-chain alkyl diol (LCD) record for the last ca. 9000 years of an alpine lake, Laguna de Río Seco (LdRS) at 3020 masl, in the Sierra Nevada (southern Spain), along with four reconstructed reference temperature time-series (from 1908 to 2008 CE at 3020 masl) used for the LCD-temperature calibration. Six main LCD isomers have been identified: C28 and C30 1,13-diols, C28 and C30 1,14-diols, and C30 and C32 1,15-diols. Four reference temperature series have been reconstructed at 3020 masl from 1) the temperature shifts between reference low elevation observatories and LdRS site: reference temperature time-series 1a (from Madrid data), and reference temperature time-series 1b (from Sevilla data), and from 2) the direct comparison between Madrid and Sevilla temperatures and those from the observatory Cetursa 5 (3020 masl, Sierra Nevada) by means of ordinary least square regressions: reference temperature time-series 2a (from Madrid data), and reference temperature time-series 2b (from Sevilla data).
    Keywords: Age; AGE; Calculated; Core; DEPTH, sediment/rock; Depth, uncorrected; DRILL; Drilling/drill rig; Laboratory code/label; LdRS; long-chain alkyl diols; Long chain diol, C28 1,13-diol, fractional abundance; Long chain diol, C28 1,14-diol, fractional abundance; Long chain diol, C30 1,13-diol, fractional abundance; Long chain diol, C30 1,14-diol, fractional abundance; Long chain diol, C30 1,15-diol, fractional abundance; Long chain diol, C32 1,15-diol, fractional abundance; Long chain diol index; Reconstructed; Shimadzu QP2010-Plus Mass Spectrometer interfaced with a Shimadzu 2010 GC; Sierra Nevada, Spain; Temperature; Temperature, calculated
    Type: Dataset
    Format: text/tab-separated-values, 1383 data points
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