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You searched for: Journal Hydrobiologia Remove constraint Journal: Hydrobiologia Publication Year 2007 Remove constraint Publication Year: 2007 Source 2007 v.586 no.1 Remove constraint Source: 2007 v.586 no.1
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1. Biodiversity of littoral nematodes from two sites in the Gulf of California

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

2. Cross-shelf and vertical distribution of siphonophore assemblages under the influence of freshwater outflows in the southern Gulf of Mexico

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

3. Diatom assemblages and their relationships to lakewater nitrogen levels and other limnological variables from 36 lakes and ponds on Banks Island, N.W.T., Canadian Arctic

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

4. Diatom assemblages in sediments of Lake Juusa, Southern Estonia with an assessment of their habitat

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

5. Differentiation of Chara intermedia and C. baltica compared to C. hispida based on morphology and amplified fragment length polymorphism

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

6. Ecological balance between ciliate plankton and its prey candidates, pico- and nanoplankton, in the East China Sea

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

7. Effects of an artificial protection structure on the sandy shore macrofaunal community: the special case of Lido di Dante (Northern Adriatic Sea)

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

8. Effects of circadian rhythms of fluctuating temperature on growth and biochemical composition of Ulva pertusa

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

9. Feeding ecology of gray whales inferred from stable-carbon and nitrogen isotopic analysis of baleen plates

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

10. Genetic variability in European Leptestheria dahalacensis (Rüppel, 1837) (Crustacea, Branchiopoda, Spinicaudata)

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

11. Habitat heterogeneity and disturbance influence patterns of community temporal variability in a small temperate stream

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

12. Hierarchical structure of stream ecosystems: consequences for bioassessment

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

13. Horizontal transport induced by upwelling in a canyon-shaped reservoir

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

14. Importance of phytoplankton carbon to heterotrophic bacteria in the Ohio, Cumberland, and Tennessee rivers, USA

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

15. Intensity of mineralization in the hyporheic zone of the prealpine river Bača (West Slovenia)

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

16. Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

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

17. Kinetics of nitrate uptake by New Zealand marine macroalgae and evidence for two nitrate transporters in Ulva intestinalis L

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:
Rhodophyta; Ulva; Ulvales; Xiphophora; ammonium compounds; macroalgae; nitrates; seawater; transporters; 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

18. Long-term lake acidification trends in high- and low-sulphate deposition regions from Nova Scotia, Canada

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

19. Microsatellite diversity and population genetic structure of redfin culter (Culter erythropterus) in fragmented lakes of the Yangtze River

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

20. Multiple carbon substrate utilization by bacteria at the sediment-water interface: seasonal patterns in a stratified eutrophic reservoir

Author:
Christian, Bradley W.; Lind, Owen T.
Source:
Hydrobiologia 2007 v.586 no.1 pp. 43-56
ISSN:
0018-8158
Subject:
amino acids; bacteria; carbon; carboxylic acids; correlation; dissolved organic carbon; dissolved oxygen; environmental factors; eutrophication; lakes; mixing; polymers; principal component analysis; putrescine; redox potential; seasonal variation; temperature; variance; winter
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