Archiv Fur Hydrobiologie最新文献_第4页

Combining dialysis and dilution techniques to estimate gross growth rate of phytoplankton and grazing by micro- and mesozooplankton in situ 结合透析和稀释技术估算浮游植物的总生长率和微浮游动物和中浮游动物的原位放牧

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0403

H. Stibor, Anna Gelzleichter, F. Hantzsche, U. Sommer, M. Striebel, O. Vadstein, Y. Olsen

引用次数: 8

Gut passage of phosphorus-limited algae through Daphnia: do they take up nutrients in the process? 限磷藻类通过水蚤的肠道通道:它们在这个过程中吸收营养吗?

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0489

M. Boersma, K. Wiltshire

{"title":"Gut passage of phosphorus-limited algae through Daphnia: do they take up nutrients in the process?","authors":"M. Boersma, K. Wiltshire","doi":"10.1127/0003-9136/2006/0167-0489","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0167-0489","url":null,"abstract":"Nutrient-limited algae are known to be a food source of inferior quality for zooplankters. Three factors are thought to determine this poor quality: direct elemental limitations of the algae, biochemical limitations and an increased resistance to digestion because of an increase in cell wall thickness. Thus far, most studies have concentrated on the effect of the algae on the daphniids. It has recently been hypothesized, however, that while going through the digestive tract of herbivorous zooplankters the digestion resistant nutrient-limited algae might actually take-up nutrients, in a similar way as it has been described for gelatinous alga such as Sphaerocystis. In this study, we present results of different experiments investigating whether nutrient-limited algae are indeed more resistant to digestion, and whether nutrient-limited algae take-up the limiting nutrient in the guts of their predators. We observed that digestion resistance is not very important, and that it can only be observed at high food levels. As a result, we could not find any evidence for nutrient uptake of these algae when they pass through the daphniids. We did find that animals adapted to low-P environments have a higher incorporation efficiency for P, and conclude that digestion resistance in nutrient stressed algae is of very limited ecological relevance.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"14 1","pages":"489-500"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82683331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Effects of duration of the planktonic phase on rotifer genetic diversity 浮游期持续时间对轮虫遗传多样性的影响

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0203

R. Ortells, A. Gómez, M. Serra

{"title":"Effects of duration of the planktonic phase on rotifer genetic diversity","authors":"R. Ortells, A. Gómez, M. Serra","doi":"10.1127/0003-9136/2006/0167-0203","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0167-0203","url":null,"abstract":"In a homogeneous aquatic environment, clonal diversity in cyclical parthe- nogens should decrease with time while the population is active in the water column due to directional clonal selection. On the contrary, if planktonic populations experi- ence a heterogeneous environment the loss of clonal diversity with time could be neu- tralised. We tested the importance of these contrasting processes using ten rotifer pop- ulations belonging to four species from the Brachionus plicatilis species complex from four different ponds, and differing in their duration of the planktonic phase. Genotypic diversity and heterozygosity estimates were obtained using allozyme data. We found a negative correlation between genotypic diversity and the duration of the planktonic phase, indicating that our populations experience a homogeneous environment, and that directional clonal selection shapes the genetic structure of rotifer populations and has long-term consequences when this effect is repeated for several years. However, diversity fluctuations observed within a season suggests that the duration of the plank- tonic phase by itself is insufficient to explain the temporal dynamics of genetic divers- ity in cyclical parthenogenetic rotifers, and that there may be other factors acting on the genotypic diversity levels at a short-time scale.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"49 1","pages":"203-216"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76417365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Selective advantage of irreversible and reversible phenotypic plasticity 不可逆和可逆表型可塑性的选择优势

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0001

W. Gabriel

引用次数: 40

Stoichiometry and growth kinetics in the "smallest zooplankton" - phagotrophic flagellates “最小浮游动物”-吞噬性鞭毛虫的化学计量学和生长动力学

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0467

J. Grover, T. Chrzanowski

引用次数: 25

Two new methods for Regime Change Analyses 政权变化分析的两种新方法

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0593

B. Manly, M. Chotkowski

{"title":"Two new methods for Regime Change Analyses","authors":"B. Manly, M. Chotkowski","doi":"10.1127/0003-9136/2006/0167-0593","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0167-0593","url":null,"abstract":"There is currently a good deal of concern about a recently recognized decline in the numbers of several pelagic fish species in the Sacramento-San Joaquin Delta in California, USA. Several research groups are investigating possible reasons for this decline. One part of this study addresses whether the decline is the result of some recent regime change in the ecosystem, and more generally whether one or more regime changes have occurred since regular sampling of fish, zooplankton and mysids shrimps began in 1967. There are many statistical methods of analysis that have been proposed to detect regime changes. These are reviewed, but it is noted that none of them is immediately suitable for analysing the basic data collected from the Sacramento-San Joaquin Delta, which consists of counts from trawl hauls and other sampling gears used in the field. Two new methods are therefore proposed for this type of data, which is commonly collected. One method searches for times when the mean level and trend in the abundance of an organism changed, assuming that in the absence of a regime change the abundances will exhibit a linear trend with time. The other method assumes that in the absence of a regime change the abundances will exhibit a polynomial trend in time, and searches for times when the mean level changed significantly. Both methods rely on bootstrap resampling of the data for assessing the significance of apparent regime changes. Simulation studies to verify the properties of the proposed analyses are described, and also some examples of the results of the analyses on the Sacramento-San Joaquin data.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"1 1","pages":"593-607"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88491680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Freshwater ciliates as ecophysiological model organisms - lessons from Daphnia, major achievements, and future perspectives 作为生态生理模式生物的淡水纤毛虫——来自水蚤的教训、主要成就和未来展望

Archiv Fur Hydrobiologie Pub Date : 2006-09-01 DOI: 10.1127/0003-9136/2006/0167-0371

T. Weisse

引用次数: 76

Embryonic experience to predation risk affects tadpoles of the common frog (Rana temporaria) 普通青蛙蝌蚪的胚胎经历对捕食风险的影响(临时蛙)

Archiv Fur Hydrobiologie Pub Date : 2006-08-01 DOI: 10.1127/0003-9136/2006/0166-0505

P. Saglio, Anne-Lise Mandrillon

{"title":"Embryonic experience to predation risk affects tadpoles of the common frog (Rana temporaria)","authors":"P. Saglio, Anne-Lise Mandrillon","doi":"10.1127/0003-9136/2006/0166-0505","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0166-0505","url":null,"abstract":"Amphibians are known to exhibit phenotypic plasticity in response to variations in predation pressure. Data also indicate that developmental changes can be induced by embryonic exposures to predator non-contact cues. However, the possible consequences of such exposures on larval behavioural activity and sensitivity to chemical cues from predators have remained unexplored. These laboratory experiments examine the effects of predation cues experienced during embryonic development on some morphological and behavioural traits in hatchlings and tadpoles of the common frog (Rana temporaria). Eggs were raised until hatching in the nonlethal presence of either a sympatric predator (larval spotted salamander, Salamandra salamandra), or an allopatric predator (juvenile Turkish crayfish, Astacus leptodactylus), or crushed conspecific tadpoles. Predators were kept either starved, or fed with R. temporaria tadpoles. Embryonic treatments had significant consequences on weight and total length of hatchlings, as well as on the general activity of tadpoles. Olfactometric tests showed that the behavioural responses of tadpoles to chemical cues from the two predators tested were not significantly affected by embryonic treatments. In contrast, embryonic experience showed a significant influence on the behavioural response of tadpoles to chemical cues from crushed conspecifics. These results indicate that the morphology of hatchlings depends on the species and diet of the predators present during embryonic development and demonstrate for the first time that the subsequent activity and chemically mediated antipredator behaviour of tadpoles can be influenced by embryonic experience of the predation risk.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"4 1","pages":"505-523"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76100538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Net production and heterotrophy in Lake Apopka: a reply to BACHMANN et al. Apopka湖的净产量和异养:对BACHMANN等人的回复。

Archiv Fur Hydrobiologie Pub Date : 2006-08-01 DOI: 10.1127/0003-9136/2006/0166-0565

C. Schelske, F. J. Aldridge, H. Carrick, M. Coveney

引用次数: 1

Rapid assessment of multiple-limiting factors of phytoplankton biomass : bioassays, in vivo chlorophyll-a fluorescence, and factorial design 浮游植物生物量多重限制因素的快速评估:生物测定、体内叶绿素-a荧光和因子设计

Archiv Fur Hydrobiologie Pub Date : 2006-08-01 DOI: 10.1127/0003-9136/2006/0166-0433

C. Leboulanger, Catherine Quiblier, P. Dufour

{"title":"Rapid assessment of multiple-limiting factors of phytoplankton biomass : bioassays, in vivo chlorophyll-a fluorescence, and factorial design","authors":"C. Leboulanger, Catherine Quiblier, P. Dufour","doi":"10.1127/0003-9136/2006/0166-0433","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0166-0433","url":null,"abstract":"An approach is described here that has been designed to determine the fac- tors that control growth and standing crop in natural populations of phytoplankton. This approach involves the use of 1) small volume bioassays of natural phytoplankton samples, incubated in semi-natural conditions, 2) indirect determination of phyto- plankton biomass during growth by in vivo chlorophyll-a fluorescence measurements, and 3) computer-designed factorial plans. A commercial computer program was used to achieve optimal planning of the assays, statistically sound and rapid data analysis, and forecasting of phytoplankton responses to inputs. An example of field application of the protocol is described, in which a phytoplankton population of a Western African Lake was studied. This approach can be used to rapidly identify the main bottom-up control factors and their interactions, and further refining of analysis with optimization of sample number. Modelled responses also make it possible to predict how phyto- plankton biomass would change in reaction to changes in environmental conditions. The pros and cons of the approach are discussed taking into account the use of frac- tional design and the reduction of sample numbers.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"39 1","pages":"433-451"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90610765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11