Jump to Main Content
PubAg
Main content area
Search
« Previous |
1 - 20 of 33
|
Next »
Search Results
- Author:
- Mundo-Ocampo, Manuel; Lambshead, P. John D.; Debenham, Nicola; King, Ian W.; De Ley, Paul; Baldwin, James G.; De Ley, Irma Tandingan; Rocha-Olivares, Axayacatl; Waumann, Dora; Thomas, W. Kelley; Packer, Margaret; Boucher, Guy
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 179-189
- ISSN:
- 0018-8158
- Subject:
- Nematoda; biodiversity; environmental factors; fauna; latitude; littoral zone; marine sediments; Europe; Gulf of California; Mexico
- Abstract:
- ... The Gulf of California, Mexico, consists of unique environmental conditions resulting in a rich array of biological diversity. Nematodes are present in most marine sediments and are probably the most abundant metazoans. This research analyses and compares nematode biodiversity in two shallow, littoral locations of the Gulf and compares the results with other Pacific and Atlantic faunae. Samples co ...
- DOI:
- 10.1007/s10750-006-0624-z
-
http://dx.doi.org/10.1007/s10750-006-0624-z
- Author:
- Sanvicente-Añorve, Laura; Alba, Claudia; Alatorre, Miguel A.; Flores-Coto, César
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 69-78
- ISSN:
- 0018-8158
- Subject:
- Cnidaria; biomass; coasts; food availability; food webs; freshwater; geographical distribution; principal component analysis; rivers; salinity; temperature; zooplankton; Gulf of Mexico
- Abstract:
- ... Siphonophores are exclusively marine cnidaria and their predatory role in plankton food-webs is well recognised. In this study, we analyse the structure and the spatial extent of siphonophore assemblages in relation to changes in freshwater outflows and food availability in the southern Gulf of Mexico during a high (October) and a low (April) outflow periods. A total of 149 samples were collected ...
- DOI:
- 10.1007/s10750-006-0492-6
-
http://dx.doi.org/10.1007/s10750-006-0492-6
- Author:
- Lim, Darlene S. S.; Smol, John P.; Douglas, Marianne S. V.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 191-211
- ISSN:
- 0018-8158
- Subject:
- Bacillariophyceae; birds; global warming; lakes; limnology; mammals; multivariate analysis; nitrogen; nitrogen content; nutrient content; ponds; sediments; Arctic region
- Abstract:
- ... Banks Island, in the Canadian Arctic Archipelago, has been identified as an important reference site for studies of environmental change, especially as it relates to climatic warming. The island is logistically manageable (i.e. researchers can survey the entire island in one field season) and, most importantly, spans three major ecoclimatic regions supporting a diverse and large bird and mammal po ...
- DOI:
- 10.1007/s10750-007-0623-8
-
http://dx.doi.org/10.1007/s10750-007-0623-8
- Author:
- Punning, Jaan-Mati; Puusepp, Liisa
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 27-41
- ISSN:
- 0018-8158
- Subject:
- Cyclotella; Stephanodiscus; biological assessment; data collection; habitats; lakes; pH; sediments; trophic relationships; Estonia
- Abstract:
- ... Diatom analysis of surface sediments and two sediment cores from different sedimentation areas of a small closed lake was undertaken with the aim of acquiring knowledge on the dependence of the distribution of diatom assemblages on lake bathymetry. Lake Juusa was selected for the study because we have for this lake a large data set about the lithological composition of sediments and macrofossil an ...
- DOI:
- 10.1007/s10750-006-0474-8
-
http://dx.doi.org/10.1007/s10750-006-0474-8
- Author:
- Boegle, Michael G.; Schneider, Susanne; Mannschreck, Beate; Melzer, Arnulf
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 155-166
- ISSN:
- 0018-8158
- Subject:
- Chara; amplified fragment length polymorphism; brackish water; coasts; freshwater; lakes; models; refuge habitats; salinity; Baltic Sea; Central European region; North Sea; Sweden
- Abstract:
- ... Charophytes are macrophytic green algae, occurring in standing and running waters throughout the world. Species descriptions of charophytes are contradictive and different determination keys use various morphologic characters for species discrimination. Chara intermedia Braun, C. baltica Bruzelius and C. hispida Hartman are treated as three species by most existing determination keys, though their ...
- DOI:
- 10.1007/s10750-006-0571-8
-
http://dx.doi.org/10.1007/s10750-006-0571-8
- Author:
- Suzuki, Toshikazu; Miyabe, Chieko
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 403-410
- ISSN:
- 0018-8158
- Subject:
- Ciliophora; ecological balance; plankton; spring; East China Sea
- Abstract:
- ... Standing stocks of ciliate plankton and its prey candidates, both picoplankton and nanoplankton, were investigated in spring in the East China Sea. The former was 1.36 x 10⁵-1.54 x 10⁸ μm³ l-¹ in biovolume, and the latter was 5.33 x 10⁶-1.11 x 10⁸ μm³ l-¹. The biovolume ratio of ciliate plankton to prey candidates ranged from 1.31 x 10-² to 2.00 x 10⁰; it was larger in abundant prey conditions and ...
- DOI:
- 10.1007/s10750-007-0715-5
-
http://dx.doi.org/10.1007/s10750-007-0715-5
- Author:
- Bertasi, Fabio; Colangelo, Marina A.; Abbiati, Marco; Ceccherelli, Victor Ugo
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 277-290
- ISSN:
- 0018-8158
- Subject:
- benthic organisms; coasts; community structure; fauna; hydrodynamics; sediments; shorelines; species diversity; surveys; Adriatic Sea; Italy
- Abstract:
- ... This study analysed the benthic compartment at Lido di Dante (Northern Adriatic Sea, Italy) within the frame of an integrated European project (DELOS), which aimed to identify, describe and quantify the effects of the Low Crested Structures (LCS) on the beach environment of many European coastlines. Both macrofaunal benthic communities and sediment characteristics were analysed in a sandy beach pr ...
- DOI:
- 10.1007/s10750-007-0701-y
-
http://dx.doi.org/10.1007/s10750-007-0701-y
- Author:
- Wang, Qiaohan; Dong, Shuanglin; Tian, Xiangli; Wang, Fang
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 313-319
- ISSN:
- 0018-8158
- Subject:
- Ulva; chlorophyll; circadian rhythm; growth models; macroalgae; proline; protein content; solutes; temperature; thallus
- Abstract:
- ... The marcoalga Ulva pertusa was cultured under (20 ± 2)°C, (20 ± 4)°C, (20 ± 6)°C, (20 ± 8)°C and (20 ± 10)°C circadian rhythms of fluctuating temperature conditions, and constant temperature of 20°C was used as the control. The growth rate of macroalga at (20 ± 2)°C, (20 ± 4)°C and (20 ± 6)°C were significantly higher than that at constant temperature of 20°C, while growth rate at (20 ± 8)°C and ( ...
- DOI:
- 10.1007/s10750-007-0700-z
-
http://dx.doi.org/10.1007/s10750-007-0700-z
- Author:
- Caraveo-Patiño, Javier; Hobson, Keith A.; Soto, Luis A.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 17-25
- ISSN:
- 0018-8158
- Subject:
- Amphipoda; calves; ecology; foraging; juveniles; nitrogen; summer; time series analysis; variance; whales; Arctic region
- Abstract:
- ... Stable-carbon and nitrogen isotopic compositions (δ¹³C, δ¹⁵N) of baleen plates of two juvenile and four adult gray whales (Eschrichtius robustus) were examined. High variance in isotopic composition of baleen plates was detected among individuals and, unlike other migratory species of baleen whales examined isotopically, δ¹³C and δ¹⁵N values of most whales showed no regular oscillations. Only one ...
- DOI:
- 10.1007/s10750-006-0477-5
-
http://dx.doi.org/10.1007/s10750-006-0477-5
- Author:
- Cesari, Michele; Luchetti, Andrea; Scanabissi, Franca; Mantovani, Barbara
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 249-260
- ISSN:
- 0018-8158
- Subject:
- Branchiopoda; genetic variation; loci; microsatellite repeats; null alleles; Italy
- Abstract:
- ... The genetic variability of the gonochoric Leptestheria dahalacensis (Rüppel, 1837) was studied through the analysis of mitochondrial and nuclear (microsatellite loci) markers in eight Italian and two Central European populations. Mitochondrial data exhibited a low variability, as only six mitotypes were scored: five in Italy and one for both Central European samples, with a very low number of subs ...
- DOI:
- 10.1007/s10750-007-0645-2
-
http://dx.doi.org/10.1007/s10750-007-0645-2
- Author:
- Brown, Bryan L.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 93-106
- ISSN:
- 0018-8158
- Subject:
- community structure; drought; humans; hydrology; macroinvertebrates; observational studies; predation; refuge habitats; streams; temporal variation; New England region
- Abstract:
- ... Both habitat heterogeneity and disturbance can profoundly influence ecological systems at many levels of biological and ecological organization. However, the joint influences of heterogeneity and disturbance on temporal variability in communities have received little attention despite the intense homogenizing influence of human activity. I performed a field manipulation of substrate heterogeneity ...
- DOI:
- 10.1007/s10750-006-0531-3
-
http://dx.doi.org/10.1007/s10750-006-0531-3
- Author:
- Ciesielka, Iwona K.; Bailey, Robert C.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 57-67
- ISSN:
- 0018-8158
- Subject:
- aquatic invertebrates; benthic zone; biological assessment; community structure; ecosystems; habitats; rivers; streams; Ontario
- Abstract:
- ... It has long been recognized that communities and their ecosystems are structured at several, nested spatial scales. But identifying the appropriate scale(s) to collect, analyse and interpret data to answer specific questions about ecosystems has been a vexing problem for ecologists. We collected observations of the benthic invertebrate community and its environment in 10 primarily agricultural tri ...
- DOI:
- 10.1007/s10750-006-0481-9
-
http://dx.doi.org/10.1007/s10750-006-0481-9
- Author:
- Okely, Patricia; Imberger, Jörg
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 343-355
- ISSN:
- 0018-8158
- Subject:
- drinking water; hydrodynamics; lakes; mass transfer; mixing; models; temperature profiles; water reservoirs
- Abstract:
- ... Several processes associated with spatial variations in buoyancy flux and mixing set up local and lake-wide horizontal temperature gradients, that in turn drive slow gravitational currents. These motions can dominate the horizontal transport and re-distribution of biological and chemical material. Here intrusions, indicative of horizontal transport, are identified in field data from a small drinki ...
- DOI:
- 10.1007/s10750-007-0706-6
-
http://dx.doi.org/10.1007/s10750-007-0706-6
- Author:
- Koch, Richard W.; Bukaveckas, Paul A.; Guelda, Debbie L.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 79-91
- ISSN:
- 0018-8158
- Subject:
- autotrophs; bacteria; carbon; lakes; nutrients; organic matter; phytoplankton; primary productivity; rivers; summer; Kentucky; Ohio River; Tennessee River
- Abstract:
- ... The flux of carbon and nutrients through aquatic systems is largely dependent upon interactions between autotrophic and heterotrophic processes. As a means of assessing the relative importance of autotrophy and heterotrophy in large rivers, we compared phytoplankton production, heterotrophic bacterial production and community respiration in three regulated rivers of the Midwestern USA. Samples wer ...
- DOI:
- 10.1007/s10750-006-0525-1
-
http://dx.doi.org/10.1007/s10750-006-0525-1
- Author:
- Simčič, Tatjana; Mori, Nataša
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 221-234
- ISSN:
- 0018-8158
- Subject:
- biofilm; carbon; electron transfer; geomorphology; gravel; microbial communities; microorganisms; mineralization; oxygen consumption; rivers; sand; sand fraction; silt; stream channels; surface water; Slovenia
- Abstract:
- ... Respiratory electron transport system (ETS) activity and oxygen consumption in the interstitial water, and in the fine (i.e. silt) and coarse (sand) sediment fractions from the hyporheic zone of the prealpine river Bača (W Slovenia) have been measured in order to estimate the intensity of potential and actual carbon mineralization through microbial communities. Hyporheic samples from the river bed ...
- DOI:
- 10.1007/s10750-007-0621-x
-
http://dx.doi.org/10.1007/s10750-007-0621-x
- Author:
- Frame, Kristin; Hunt, Gene; Roy, Kaustuv
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 331-342
- ISSN:
- 0018-8158
- Subject:
- anthropogenic activities; arthropods; fauna; habitats; humans; littoral zone; macroalgae; species diversity; trampling damage; California
- Abstract:
- ... Rocky intertidal algae harbor a diverse invertebrate meiofauna of arthropods, nematodes and other invertebrates. Despite its ecological importance, relatively little is known about the diversity and composition of this important component of intertidal biodiversity. In this study, we quantified species composition, abundance and distribution of ostracodes, an important group of phytal meiofauna, a ...
- DOI:
- 10.1007/s10750-007-0707-5
-
http://dx.doi.org/10.1007/s10750-007-0707-5
- Author:
- Rees, T. A. V.; Dobson, B. C.; Bijl, M.; Morelissen, B.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 135-141
- ISSN:
- 0018-8158
- Subject:
- macroalgae; transporters; Ulva; ammonium compounds; seawater; nitrates; Rhodophyta; Xiphophora; New Zealand
- Abstract:
- ... Kinetic constants were determined for nitrate uptake in three species, Pterocladiella capillacea (S.G. Gmelin) Santelices et Hommersand (Rhodophyceae, Gelidiales), Ulva intestinalis L. (Chlorophyceae, Ulvales) and Xiphophora chondrophylla (Turner) Montagne ex Harvey (Phaeophyceae, Fucales), of New Zealand macroalgae, with K m values ranging from 10 to 17 μM and V max values from 3 to 65 μmole g-¹ ...
- DOI:
- 10.1007/s10750-006-0569-2
-
http://dx.doi.org/10.1007/s10750-006-0569-2
- Author:
- Ginn, Brian K.; Cumming, Brian F.; Smol, John P.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 261-275
- ISSN:
- 0018-8158
- Subject:
- acidification; acids; highlands; lakes; national parks; pH; sulfates; Nova Scotia
- Abstract:
- ... Diatom-based paleolimnological techniques were used to study 14 lakes from two regions of Nova Scotia which represent regions of high and low sulphate deposition. Using decadal scale intervals, changes in diatom assemblages and diatom-inferred pH were tracked in relation to deposition of anthropogenic-sourced strong acids. Eight study lakes were located in Kejimkujik National Park in the southwest ...
- DOI:
- 10.1007/s10750-007-0644-3
-
http://dx.doi.org/10.1007/s10750-007-0644-3
- Author:
- Wang, Chunyan; Yu, Xiaomu; Tong, Jingou
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 321-329
- ISSN:
- 0018-8158
- Subject:
- Culter; alleles; freshwater fish; genetic variation; heterozygosity; lakes; microsatellite repeats; population structure; variance; China; Yangtze River
- Abstract:
- ... Redfin culter (Culter erythropterus) is a small lethic freshwater fish and widely distributed in the adjacent lakes of the Yangtze River of China. Five microsatellite loci were applied to investigate the genetic variation and population structure of redfin culter from seven lakes in the middle-and-lower reaches of the Yangtze River. The gene diversity was high among the populations (H > 0.9), the ...
- DOI:
- 10.1007/s10750-007-0702-x
-
http://dx.doi.org/10.1007/s10750-007-0702-x
- Author:
- Christian, Bradley W.; Lind, Owen T.
- Source:
- Hydrobiologia 2007 v.586 no.1 pp. 43-56
- ISSN:
- 0018-8158
- Subject:
- correlation; redox potential; winter; lakes; mixing; bacteria; variance; principal component analysis; environmental factors; amino acids; putrescine; dissolved organic carbon; eutrophication; polymers; seasonal variation; temperature; dissolved oxygen; carboxylic acids
- Abstract:
- ... Sediment-water interfaces (SWIs) in lakes and reservoirs harbor diverse assemblages of heterotrophic bacteria that influence organic matter cycling. Seasonal reservoir mixing and stratification affect the rate and type of dissolved organic carbon (DOC) utilized by SWI bacteria, however these seasonal carbon utilization dynamics remain poorly understood. We conducted an exploratory multi-seasonal s ...
- DOI:
- 10.1007/s10750-006-0476-6
-
http://dx.doi.org/10.1007/s10750-006-0476-6