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You searched for: Journal name Freshwater biology Remove constraint Journal name: Freshwater biology Publication year rev 7991-2009 Remove constraint Publication year rev: 7991-2009 Source 2009 v.54 no.11 Remove constraint Source: 2009 v.54 no.11
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1. Bryozoan populations reflect nutrient enrichment and productivity gradients in rivers

Author:
HARTIKAINEN, HANNA; JOHNES, PENNY; MONCRIEFF, CLIVE; OKAMURA, BETH
Source:
Freshwater biology 2009 v.54 no.11 pp. 2320-2334
ISSN:
0046-5070
Subject:
Bryozoa; altitude; biomass; chlorophyll; diet; freshwater; mortality; nutrient content; phosphorus; rare species; regression analysis; rivers; sediments; traps
Abstract:
... 1. The hypothesis that nutrient enrichment will affect bryozoan abundance was tested using two complementary investigations; a field-based method determining bryozoan abundance in 20 rivers of different nutrient concentrations by deploying statoblast (dormant propagule) traps and an experimental laboratory microcosm study measuring bryozoan growth and mortality. These two methods confirmed indepen ...
DOI:
10.1111/j.1365-2427.2009.02262.x

2. Carbon assimilation mode in mixotrophs and the fatty acid composition of their rotifer consumers

Author:
WACKER, ALEXANDER; WEITHOFF, GUNTRAM
Source:
Freshwater biology 2009 v.54 no.11 pp. 2189-2199
ISSN:
0046-5070
Subject:
Brachionus; Chlamydomonas; alpha-linolenic acid; carbon; diet; ecophysiology; eicosapentaenoic acid; fatty acid composition; glucose; omega-3 fatty acids
Abstract:
... 1. We examined an important ecophysiological link between the mixotrophic flagellate Chlamydomonas acidophila and its consumers, the rotifers Elosa worallii, Cephalodella sp. and Brachionus sericus, by comparing their fatty acid profiles. 2. The mixotrophic flagellate was grown under either exclusively autotrophic conditions in the light, under exclusively heterotrophic conditions in the dark with ...
DOI:
10.1111/j.1365-2427.2009.02251.x

3. Contribution of fungal biomass to the growth of the shredder, Pycnopsyche gentilis (Trichoptera: Limnephilidae)

Author:
CHUNG, NAMIL; SUBERKROPP, KELLER
Source:
Freshwater biology 2009 v.54 no.11 pp. 2212-2224
ISSN:
0046-5070
Subject:
Anguillospora; Limnephilidae; Liriodendron tulipifera; Paenibacillus larvae; carbon; diet; digestive physiology; feeding behavior; instars; larvae; larval development; leaves; microbial biomass; nutritive value
Abstract:
... 1. 1. It has been accepted that aquatic hyphomycetes colonising submerged leaves increase the nutritional value of leaf detritus and suggested that fungal biomass plays a greater role in the growth of shredders than leaf tissue itself. However, it is not clear what proportion of the nutritional needs of shredders is met by fungal biomass. 2. We fed Pycnopsyche gentilis larvae with tulip poplar (Li ...
DOI:
10.1111/j.1365-2427.2009.02260.x

4. Ecological assessment of an intermittent Mediterranean river using community structure and function: evaluating the role of different organism groups

Author:
HUGHES, SAMANTHA JANE; SANTOS, JOSÉ MARIA; FERREIRA, MARIA TERESA; CARAÇA, RUTE; MENDES, ANA M.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2383-2400
ISSN:
0046-5070
Subject:
altitude; birds; community structure; fish; floodplains; habitats; land use change; lotic systems; macroinvertebrates; macrophytes; monitoring; pH; principal component analysis; rivers
Abstract:
... 1. Reliable lotic ecological monitoring requires knowledge of river typology, environmental factors, the effect of stressors known here as 'pressures' and appropriate indicators of anthropogenically induced change. We sampled benthic macroinvertebrate, fish, bird and macrophyte communities along an intermittent Mediterranean river and analysed community structure (relative abundance) and function ...
DOI:
10.1111/j.1365-2427.2009.02253.x

5. Extended lifespan traded for diapause in Daphnia

Author:
SLUSARCZYK, MIROSŁAW
Source:
Freshwater biology 2009 v.54 no.11 pp. 2252-2262
ISSN:
0046-5070
Subject:
Daphnia pulex; cold; color; diapause; eggs; environmental degradation; evolution; field experimentation; freshwater; fuels; habitats; lakes; life history; lifestyle; longevity; mountains; parthenogenesis; phenotypic plasticity; spring; summer; winter; Arctic region; Poland
Abstract:
... 1. Most freshwater crustaceans of the genus Daphnia are cyclically parthenogenetic organisms that are well adapted to unstable habitats due to their short life cycle, wide phenotypic plasticity, and the ability to produce protective diapausing eggs in anticipation of environmental deterioration. Short lifespan and heterogonic reproduction are typical features of Daphnia in a broad spectrum of fres ...
DOI:
10.1111/j.1365-2427.2009.02256.x

6. Seasonal trophic dynamics affect zooplankton community variability

Author:
BEISNER, BEATRIX E.; PERES-NETO, PEDRO R.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2351-2363
ISSN:
0046-5070
Subject:
Copepoda; adults; carnivores; community structure; ecologists; fish; food webs; herbivores; invertebrates; nauplii; omnivores; population growth; predation; prediction; species diversity; zooplankton
Abstract:
... 1. The degree to which communities are variable may be affected by the ecological conditions to which they are exposed and can affect their propensity to form alternative states. We examined the influence of two common ecological factors, predation and seasonal successional stage, on the variability in community composition of herbivorous pond plankton. In a highly replicated, two factor, mesocosm ...
DOI:
10.1111/j.1365-2427.2009.02266.x

7. Subfossil Cladocera in relation to contemporary environmental variables in 54 Pan-European lakes

Author:
BJERRING, RIKKE; BECARES, ELOY; DECLERCK, STEVEN; GROSS, ELISABETH M.; HANSSON, LARS-ANDERS; KAIRESALO, TIMO; NYKÄNEN, MIRVA; HALKIEWICZ, ANNA; KORNIJÓW, RYSZARD; CONDE-PORCUNA, JOSÉ M.; SEFERLIS, MILTIADIS; NÕGES, TIINA; MOSS, BRIAN; AMSINCK, SUSANNE LILDAL; ODGAARD, BENT VAD; JEPPESEN, ERIK
Source:
Freshwater biology 2009 v.54 no.11 pp. 2401-2417
ISSN:
0046-5070
Subject:
Cladocera; acid tolerance; chlorophyll; cold zones; community structure; eggs; environmental factors; fish; fish communities; food availability; growing season; habitat preferences; lakes; latitude; macrophytes; nutrient content; regression analysis; sediments; temperature; trophic relationships
Abstract:
... 1. Changes in cladoceran subfossils in the surface sediments of 54 shallow lakes were studied along a European latitude gradient (36-68°N). Multivariate methods, such as regression trees and ordination, were applied to explore the relationships between cladoceran taxa distribution and contemporary environmental variables, with special focus on the impact of climate. 2. Multivariate regression tree ...
DOI:
10.1111/j.1365-2427.2009.02252.x

8. The response of invertebrates to a gradient of flow reduction - an instream channel study in a New Zealand lowland river

Author:
JAMES, ALEXANDER B.W.; SUREN, ALASTAIR M.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2225-2242
ISSN:
0046-5070
Subject:
Ostracoda; Oxyethira; biomass; chlorophyll; dissolved oxygen; invertebrates; organic matter; periphyton; rivers; streams; temperature; temporal variation; New Zealand
Abstract:
... 1. The impacts of low flows on invertebrates were assessed in six experimental channels placed in a lowland stream. Each channel consisted of replicate stacked gravel-filled baskets (buried 0-7, 8-14 and 15-21 cm deep) from which invertebrates were sampled. Samples were collected before, and 1 and 2 months after flows were reduced by varying amounts. We predicted that invertebrate communities woul ...
DOI:
10.1111/j.1365-2427.2009.02254.x

9. Validation and implications of a growth model for brown trout, Salmo trutta, using long-term data from a small stream in north-west England

Author:
ELLIOTT, J.M.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2263-2275
ISSN:
0046-5070
Subject:
Salmo trutta; climate change; compensatory growth; drought; freshwater; gravel; growth models; juveniles; population density; streams; summer; trout; water temperature; winter; England
Abstract:
... 1. The objectives were: (i) to check the validity of a new growth model; (ii) to examine the relationship between population density and both mean mass and mean growth rate and (iii) to discover if compensatory growth occurred. First (0+) and second (1+) year-old juvenile sea-trout were sampled by electrofishing at the beginning and end of the summer from 1967 to 2000. Additional samples were take ...
DOI:
10.1111/j.1365-2427.2009.02258.x

10. Alkalinity generation and sediment CO₂ uptake influence establishment of Sparganium angustifolium in softwater lakes

Author:
LUCASSEN, ESTHER C.H.E.T.; SPIERENBURG, P.; FRAAIJE, R.G.A.; SMOLDERS, A.J.P.; ROELOFS, J.G.M.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2300-2314
ISSN:
0046-5070
Subject:
Sparganium; alkalinity; ammonium compounds; bicarbonates; biomass; calcium; carbon; carbon dioxide; carbonates; ecophysiology; iron; laboratory experimentation; lakes; leaves; liming; magnesium; nutrient availability; phosphates; redox potential; roots; sediments; surveys; water quality
Abstract:
... 1. Softwater lakes are generally dominated by slow growing, small, isoetid plant species that are adapted to the carbon- and nutrient-limited conditions in these lakes. We investigated the strategy of a fast growing species, Sparganium angustifolium, for occupying softwater lakes. A field survey was carried out in Norwegian carbon-limited Isoëteto-Lobelietum softwater lakes to compare abiotic cond ...
DOI:
10.1111/j.1365-2427.2009.02264.x

11. Calcium balance in Daphnia grown on diets differing in food quantity, phosphorus and calcium

Author:
HE, XUE-JIA; WANG, WEN-XIONG
Source:
Freshwater biology 2009 v.54 no.11 pp. 2200-2211
ISSN:
0046-5070
Subject:
Daphnia magna; calcium; diet; excretion; freshwater; molting; phosphorus; radiolabeling; young adults
Abstract:
... 1. The influences of dietary phosphorus (P) and food concentration on the calcium (Ca) balance in Daphnia magna were examined in this study at two different ambient Ca concentrations (0.5 and 10 mg Ca L⁻¹). Daphnia were grown by feeding the young adults differentially under contrasting dietary P conditions [molar C : P ratio = c. 900 and c. 90 as low P (LP) and high P (HP), respectively], ambient ...
DOI:
10.1111/j.1365-2427.2009.02255.x

12. Colonisation by Dreissena of Great Lakes coastal ecosystems: how suitable are wetlands

Author:
NELSON, KRISTIN M.; RUETZ, CARL R. III.; UZARSKI, DONALD G.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2290-2299
ISSN:
0046-5070
Subject:
Dreissena bugensis; Dreissena polymorpha; basins; ecosystems; habitats; mussels; sediments; vegetation; water waves; wetlands; Great Lakes
Abstract:
... 1. Invasive zebra (Dreissena polymorpha) and quagga mussels (Dreissena bugensis) have become widespread throughout the Great Lakes basin. However, some types of Great Lakes coastal wetlands may be unsuitable for Dreissena invasion. 2. To test this observation, artificial substrata were placed in wetlands (with emergent vegetation) and in adjacent open water (without emergent vegetation) habitats i ...
DOI:
10.1111/j.1365-2427.2009.02265.x

13. Concerns regarding the use of amphibians as metrics of critical biological thresholds: a comment on Welsh '' Hodgson (2008)

Author:
KROLL, ANDREW J.; HAYES, MARC P.; MACCRACKEN, JAMES G.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2364-2373
ISSN:
0046-5070
Subject:
amphibians; cost effectiveness; ecosystems; environmental health; environmental management; geographical distribution; habitats; monitoring; population size; predation; sediments; streams; uncertainty; water temperature; watersheds; wood; California
Abstract:
... 1. Welsh '' Hodgson (2008) argued that stream-associated amphibians (Ascaphus truei, Dicamptodon tenebrosus and Rhyacotriton variegatus) are reliable indicators of ecosystem health in the Pacific Northwest (PNW), U.S.A. We demonstrate that their assertions rely on circular reasoning as well as logical and empirical assumptions that have not received rigorous evaluation. 2. Welsh '' Hodgson (2008) ...
DOI:
10.1111/j.1365-2427.2009.02245.x

14. Intraspecific variation in the consumption of exotic prey - a mechanism that increases biotic resistance against invasive species

Author:
CARLSSON, NILS O.L.; STRAYER, DAVID L.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2315-2319
ISSN:
0046-5070
Subject:
Ambloplites rupestris; Lepomis gibbosus; diet; fish; intraspecific variation; introduced species; invasive species; predators
Abstract:
... 1. Hyper-successful exotic species can both displace the native prey that formerly made up a native predator's diet and represent an abundant potential prey resource for native predators. Little is known about how this drastic change affects native predators, or their short- and long term potential to regulate the exotic species. 2. We compared zebra mussel consumption by pumpkinseed sunfish (Lepo ...
DOI:
10.1111/j.1365-2427.2009.02263.x

15. Microbial leaf degraders in boreal streams: bringing together stochastic and deterministic regulators of community composition

Author:
FISCHER, HELMUT; BERGFUR, JENNY; GOEDKOOP, WILLEM; TRANVIK, LARS
Source:
Freshwater biology 2009 v.54 no.11 pp. 2276-2289
ISSN:
0046-5070
Subject:
bacteria; community structure; denaturing gradient gel electrophoresis; environmental factors; fungi; habitats; hydrochemistry; leaves; microbial communities; streams; watersheds; Sweden
Abstract:
... 1. Leaves that fall into the water represent a new habitat for microorganisms to colonise in streams, providing an opportunity to study colonisation and the subsequent regulation of community structure. We explored community composition of bacteria and fungi on decomposing alder leaves in nine streams in central Sweden, and describe their relationship with environmental variables. Succession of th ...
DOI:
10.1111/j.1365-2427.2009.02257.x

16. Stream amphibians as metrics of critical biological thresholds in the Pacific Northwest, U.S.A.: a response to Kroll et al

Author:
WELSH JR, HARTWELL H.; HODGSON, GARTH R.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2374-2382
ISSN:
0046-5070
Subject:
amphibians; anthropogenic activities; biocenosis; biometry; blood pressure; coasts; ecosystems; environmental factors; freshwater; human health; life tables; meta-analysis; models; prediction; streams; water temperature; watersheds; California; Oregon
Abstract:
... 1. Kroll, Hayes '' MacCracken (in press) Concerns regarding the use of amphibians as metrics of critical biological thresholds: a comment on Welsh and Hodgson 2008 . Freshwater Biology, criticised our paper [ Welsh '' Hodgson (2008) Amphibians as metrics of critical biological thresholds in forested headwater streams of the Pacific Northwest. Freshwater Biology, 53, 1470-1488] proposing the use of ...
DOI:
10.1111/j.1365-2427.2009.02273.x

17. The effect of land use on dissolved organic carbon and nitrogen uptake in streams

Author:
JOHNSON, LAURA T.; TANK, JENNIFER L.; ARANGO, CLAY P.
Source:
Freshwater biology 2009 v.54 no.11 pp. 2335-2350
ISSN:
0046-5070
Subject:
dissolved organic nitrogen; acetates; autumn; dissolved inorganic nitrogen; ammonium compounds; solutes; spring; streams; dissolved organic carbon; summer; nutrients; land use; deoxynivalenol; Michigan
Abstract:
... 1. Agricultural and urban land use may increase dissolved inorganic nitrogen (DIN) concentrations in streams and saturate biotic nutrient demand, but less is known about their impacts on the cycling of organic nutrients. To assess these impacts we compared the uptake of DIN (as ammonium, NH₄⁺), dissolved organic carbon (DOC, as acetate), and dissolved organic nitrogen (DON, as glycine) in 18 low-g ...
DOI:
10.1111/j.1365-2427.2009.02261.x

18. Unravelling complexities in benthic food webs using a dual stable isotope (hydrogen and carbon) approach

Author:
DEINES, PETER; WOOLLER, MATTHEW J.; GREY, JONATHAN
Source:
Freshwater biology 2009 v.54 no.11 pp. 2243-2251
ISSN:
0046-5070
Subject:
acetates; autotrophs; carbon; fermentation; food webs; freshwater; hydrogen; lakes; larvae; macroinvertebrates; methane; methane production; microbial biomass; nitrogen; stable isotopes; streams; tissues; uncertainty
Abstract:
... 1. Stable carbon isotope studies have been an essential component of research regarding the contribution of methane (CH₄)-derived carbon to freshwater food webs and results have suggested that benthic macroinvertebrates in billabongs, streams and lakes may be partially, and in some instances, significantly 'fuelled' by methanotrophic biomass. However, the singular use of carbon isotopes can lead t ...
DOI:
10.1111/j.1365-2427.2009.02259.x