Pub Date : 1991-08-13DOI: 10.1127/archiv-hydrobiol/121/1991/497
P. Snoeijs
{"title":"Monitoring pollution effects by diatom community composition. A comparison of sampling methods","authors":"P. Snoeijs","doi":"10.1127/archiv-hydrobiol/121/1991/497","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/497","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115179256","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}
Pub Date : 1991-08-13DOI: 10.1127/archiv-hydrobiol/121/1991/463
R. Schröder
{"title":"Relevant parameters to define the trophic state of lakes","authors":"R. Schröder","doi":"10.1127/archiv-hydrobiol/121/1991/463","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/463","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"37 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132434008","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/343
D. Hessen, A. Lyche
{"title":"Inter- and intraspecific variations in zooplankton element composition","authors":"D. Hessen, A. Lyche","doi":"10.1127/archiv-hydrobiol/121/1991/343","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/343","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128754217","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/261
A. Walsby, R. Kinsman, B. Ibelings, C. Reynolds
The colonial gas-vacuolate cyanobacterium Anabaena lemmermannii has formed modest populations in Windermere during the months of June and July in recent years. During the summer of 1990 the colonies were dispersed in the well-mixed upper epilimnion of the main lake basins but formed light surface scums along leeward shores and in sheltered bays, including Mitchell Wyke. The gas vesicles of this species were found to be much stronger (p(c)0.93 MPa) than those in other Anabaena species; they would withstand exposure to hydrostatic pressures at depths exceeding 40 m and they would therefore survive deep-mixing events in this lake. The colonies were highly buoyant; they required only 46% of their gas vesicles to render 50% of the colonies neutrally buoyant in one sample. In another sample the buoyant density of colonies with intact gas vesicles was 975 kg m-3 compared with 1022 kg m-3 after gas vesicles collapse, which indicated that only 51% of the gas vesicles were need to give the same density as water. In a third sample comparison of the mean colony floation rate of 181-mu-m s-1 before gas vesicle collapse with the sinking rate of 186-mu-m s-1 after collapse also demonstrated that 51% of the gas vesicles were required for neutral buoyancy. Colonies incubated in two bottles at the lake surface failed to respond to the high irradiance by losing their buoyancy. It was calculated that the colonies would not have been able to accumulate sufficient carbohydrate in a day to overcome the excess buoyancy provided by their gas vesicles; the high critical pressure of the gas vesicles prevented their collapse by turgor pressure rise. The inability of highly buoyant cyanobacteria to lose buoyancy may provide a general explanation for the persistence of cyanobacterial surface water-blooms.
近年来，殖民地气液泡蓝藻Anabaena lemmermannii在6月和7月在温德米尔形成了适度的种群。在1990年夏天，这些群落分散在主要湖盆混合良好的上边缘，但在背风海岸和有遮蔽的海湾，包括米切尔·威克，形成了浅色的表面浮冰。结果表明，该种属的气囊比其他种属的气囊强(p(c)0.93 MPa);它们可以承受深度超过40米的静水压力，因此它们可以在这个湖的深层混合事件中存活下来。殖民地的浮力很大;他们只需要46%的气体囊泡就能使一个样品中50%的菌落呈中性浮力。在另一个样品中，完整气囊的菌落浮力密度为975 kg m-3，而气囊崩塌后的菌落浮力密度为1022 kg m-3，这表明只需要51%的气囊就能达到与水相同的密度。在第三个样本中，气体囊泡崩解前的平均菌落漂浮速率为181 μ m m s-1，崩解后的沉降速率为186 μ m m s-1，对比结果也表明，51%的气体囊泡需要中性浮力。在湖面上的两个瓶子里孵育的蜂群由于失去浮力而无法对高辐射做出反应。据计算，菌落不可能在一天内积累足够的碳水化合物来克服它们的气囊提供的多余浮力;气泡的高临界压力通过膨胀压力的上升防止了它们的崩溃。高度浮力的蓝藻无法失去浮力可能为蓝藻表面水华的持久性提供了一般解释。
{"title":"Highly buoyant colonies of the cyanobacterium Anabaena lemmermannii form persistent surface waterblooms","authors":"A. Walsby, R. Kinsman, B. Ibelings, C. Reynolds","doi":"10.1127/archiv-hydrobiol/121/1991/261","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/261","url":null,"abstract":"The colonial gas-vacuolate cyanobacterium Anabaena lemmermannii has formed modest populations in Windermere during the months of June and July in recent years. During the summer of 1990 the colonies were dispersed in the well-mixed upper epilimnion of the main lake basins but formed light surface scums along leeward shores and in sheltered bays, including Mitchell Wyke. The gas vesicles of this species were found to be much stronger (p(c)0.93 MPa) than those in other Anabaena species; they would withstand exposure to hydrostatic pressures at depths exceeding 40 m and they would therefore survive deep-mixing events in this lake. The colonies were highly buoyant; they required only 46% of their gas vesicles to render 50% of the colonies neutrally buoyant in one sample. In another sample the buoyant density of colonies with intact gas vesicles was 975 kg m-3 compared with 1022 kg m-3 after gas vesicles collapse, which indicated that only 51% of the gas vesicles were need to give the same density as water. In a third sample comparison of the mean colony floation rate of 181-mu-m s-1 before gas vesicle collapse with the sinking rate of 186-mu-m s-1 after collapse also demonstrated that 51% of the gas vesicles were required for neutral buoyancy. Colonies incubated in two bottles at the lake surface failed to respond to the high irradiance by losing their buoyancy. It was calculated that the colonies would not have been able to accumulate sufficient carbohydrate in a day to overcome the excess buoyancy provided by their gas vesicles; the high critical pressure of the gas vesicles prevented their collapse by turgor pressure rise. The inability of highly buoyant cyanobacteria to lose buoyancy may provide a general explanation for the persistence of cyanobacterial surface water-blooms.","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134424526","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/373
Å. Bengtsson
{"title":"Effects of bleached pulp mill effluents on vertebral defects in fourhorn sculpin (Myoxocephalus quadricornis L.) in the Gulf of Bothnia","authors":"Å. Bengtsson","doi":"10.1127/archiv-hydrobiol/121/1991/373","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/373","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124519610","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/307
A. Yagi, S. Miyachi, H. Terai
{"title":"Vertical distribution of purple nonsulphur bacteria and their utilization of dissolved organic carbon in Lake Fukami-ike","authors":"A. Yagi, S. Miyachi, H. Terai","doi":"10.1127/archiv-hydrobiol/121/1991/307","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/307","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131914455","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/281
J. Kiviranta, K. Sivonen, K. Lahti, R. Luukkainen, S. Niemelä
{"title":"Production and biodegradation of cyanobacterial toxins - a laboratory study","authors":"J. Kiviranta, K. Sivonen, K. Lahti, R. Luukkainen, S. Niemelä","doi":"10.1127/archiv-hydrobiol/121/1991/281","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/281","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131329118","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/365
C. Nwadiaro, M. Odigi
{"title":"Sediments of Lake Oguta, Nigeria I. Cations and trace metals","authors":"C. Nwadiaro, M. Odigi","doi":"10.1127/archiv-hydrobiol/121/1991/365","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/365","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"428 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134022792","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}
Pub Date : 1991-06-20DOI: 10.1127/archiv-hydrobiol/121/1991/319
R. M. Pinto-Coelho
{"title":"The importance of Daphnia for zooplankton grazing in Lake Constance","authors":"R. M. Pinto-Coelho","doi":"10.1127/archiv-hydrobiol/121/1991/319","DOIUrl":"https://doi.org/10.1127/archiv-hydrobiol/121/1991/319","url":null,"abstract":"","PeriodicalId":146956,"journal":{"name":"Archiv für Hydrobiologie","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124811376","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}
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