Influence of river discharge and wind field on the freshwater meiofauna of a dynamic river mouth area

Witthöft-Mühlmann, André

doi:10.1127/0003-9136/2005/0163-0307

Cited by 6 publications

(5 citation statements)

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“…The predominance of nematodes at all sites in this study is in line with the findings of most previous studies of freshwater meiobenthic communities (Nalepa & Quigley, 1983;Strayer, 1985;Traunspurger, 1996a;Bergtold & Traunspurger, 2004;Michiels & Traunspurger, 2004, 2005a. The mean nematode abundances recorded here (total mean: 149 ± 109 ind./10 cm 2 ) rank among the higher values found in other littoral studies, which in most cases yielded fewer than 120 ind./10 cm 2 , even from littoral areas of meso-/eutrophic lakes (Traunspurger, 2002;Michiels & Traunspurger, 2005a).…”

Section: Communitiessupporting

confidence: 91%

“…The microbial, chemical and granulometric methods applied follow those described in detail by Witthöft-Mühlmann et al (2005a). Algal pigment composition was analysed by a modified HPLC technique after Schmid et al (1995).…”

Section: Analysesmentioning

confidence: 99%

“…Seasonal and spatial distribution patterns of nematodes have been described for several lakes (Biró, 1973;Holopainen & Paasivirta, 1977;Prejs, 1977;Bretschko, 1984;Strayer, 1985;Raspopov et al, 1996;Traunspurger, 1996a;Bergtold & Traunspurger, 2004;Michiels & Traunspurger, 2004, 2005aWu et al, 2004). However, * Corresponding author, e-mail: Andre.Witthoeft@onlinehome.de studies dealing with the meiobenthic structure of river mouth areas are rare (Nalepa & Quigley, 1983).…”

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confidence: 96%

“…However, * Corresponding author, e-mail: Andre.Witthoeft@onlinehome.de studies dealing with the meiobenthic structure of river mouth areas are rare (Nalepa & Quigley, 1983). In an earlier study we were able to show that the presence of nematodes within and adjacent to the dynamic habitat at the mouth of the River Schussen was closely related to the interaction between wind and river discharge (Witthöft-Mühlmann et al, 2005a). The present study focuses on nematode communities inhabiting the same area, where six sample sites: i) direct within the river inflow-zone; ii) intermediate zones; and iii) far distant zone) were investigated on a monthly basis over a 1 year period and nematode species and feeding types determined.…”

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confidence: 96%

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Nematodes of Lake Constance, Germany, with special reference to littoral communities of a river mouth area

Witthöft-Mühlmann¹,

Traunspurger²,

Rothhaupt³

2006

Nematol

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Six sites within the littoral habitat of Lake Constance in Germany were studied from February 1999 to January 2000 in order to determine the influence of the inflowing River Schussen on local nematode assemblages. The sites were selected to represent a gradient of river influence within the broader river mouth area. The area as a whole was found to be rich in nematode diversity, with 106 nematode species identified. The nematode communities recorded ranged in density from 121 to 165 individuals/10 cm 2 and in biomass from 108 to 503 µg wet weight/10 cm 2 . They were also shown to vary in terms of feeding ecology, with significant differences in the proportions of feeding types occurring among site. Deposit feeders were most abundant, followed by chewers, although the latter dominated in terms of biomass. Epistrate feeders were less common and suction feeders rare. The occurrence of epistrate feeders was linked to the concentration of algal pigment, whereas records of deposit feeders and chewers correlated with bacterial density and organic carbon content. The characters of the different nematode communities in the vicinity of the river mouth were found to reflect the transitional nature of the study area.

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Section: Communitiessupporting

confidence: 91%

Section: Analysesmentioning

confidence: 99%

mentioning

confidence: 96%

mentioning

confidence: 96%

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Nematodes of Lake Constance, Germany, with special reference to littoral communities of a river mouth area

Witthöft-Mühlmann¹,

Traunspurger²,

Rothhaupt³

2006

Nematol

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“…Existing work on unaltered stream‐–lake networks largely focuses on the downstream effects of lakes, while relatively little attention has been paid to lake effects on inlet streams (see review by Jones, ) such as Bear Creek. Stream and river deltas are known to be hotspots of biodiversity (Willis & Magnuson, ) and production (Witthöft‐Mühlmann, Traunspurger & Rothhaupt, ) within the stream–lake network. However, complex lake level dynamics due to variable patterns of precipitation and snowmelt can result in considerable changes to the physical habitat template and local environmental conditions of stream deltas; just as variability in flows modify the habitat mosaic upstream of lake influence (Stanford et al ., ; Whited et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Juvenile coho salmon track a seasonally shifting thermal mosaic across a river floodplain

et al. 2016

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1. Seasonal variation in river water levels creates a shifting mosaic of habitat conditions associated with variables such as water temperature, chemistry and prey availability to consumers. Previous work has shown that fishes can exploit spatial variation in water temperature, but less is known about how they respond to shifts in the spatial arrangement of habitat conditions through time. 2. Juvenile coho salmon (Oncorhynchus kisutch) are the numerically dominant fish species in many southwest Alaskan streams, which exhibit seasonal variation in water level and temperature due to changes in precipitation and snowmelt. We assessed the degree to which juvenile coho salmon exploit the associated shifting mosaic of water temperature by monitoring the spatial distribution of water temperatures and juvenile coho salmon in the lake-influenced reaches of a southwest Alaskan stream. We also monitored the diets of juvenile coho salmon relative to the spatial distribution of prey taxa. 3. Juvenile coho salmon exhibited two scales of movement to track spatiotemporal variation in habitat conditions. First, over the course of 6 weeks, individuals moved among off-channel units, tracking shifts in the location of warm water habitat caused by receding water level. Second, individuals moved at diel time scales, foraging on benthic macroinvertebrates in the cold thalweg of the stream at night and then digesting prey in warmer off-channel habitats during the day. 4. Seasonally asynchronous variation in water temperature among off-channel habitat units produced portfolio effects in habitat conditions, such that coho salmon had continual access to warm habitat for digestion despite its ephemeral availability at discrete locations. 5. Our study demonstrates that behavioural thermoregulation by juvenile fishes can be important throughout the growing season and is not restricted to ephemeral events such as resource pulses or heat stress. Our results have implications for the conservation of highly connected, heterogeneous landscapes, and their ability to support economically and ecologically important species such as coho salmon.

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Combined influence of river discharge and wind on littoral nematode communities of a river mouth area of Lake Constance

2007

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The littoral nematode community adjacent to a river mouth (River Schussen) on Lake Constance (Germany) was studied from February 1999 to January 2000 in order to determine the influence of stress resulting from fluctuations in river discharge on local nematode assemblages. Additionally, the influence of wind as a second important stress factor was considered. Six sample sites were chosen, reflecting a gradient of river influence within the broader river mouth area. Nematode communities, varying in a mean range from 121 to 165 ind/10 cm 2 , were found to differ significantly in terms of abundance, feeding type composition and species diversity. Deposit feeders were most abundant at all sites followed by chewers. Deposit feeders were affected mainly by wind events, while species diversity and the occurrence of chewers were influenced mainly by river discharge. The impact of both these stress factors was modified by a third variable, water level. Moderate and high levels of combined habitat stress led to significant changes in community structure. Under conditions of calm weather and low discharge, reduced species diversity and an increased predominance of deposit feeders were observed. In most cases, species diversity was found to be higher under moderate stress conditions, an observation that offers support for Connel's Intermediate Disturbance Hypothesis.

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Influence of river discharge and wind field on the freshwater meiofauna of a dynamic river mouth area

Cited by 6 publications

References 0 publications

Nematodes of Lake Constance, Germany, with special reference to littoral communities of a river mouth area

Nematodes of Lake Constance, Germany, with special reference to littoral communities of a river mouth area

Juvenile coho salmon track a seasonally shifting thermal mosaic across a river floodplain

Combined influence of river discharge and wind on littoral nematode communities of a river mouth area of Lake Constance

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