Invertebrate Movements within a Small Stream: Density Dependence or Compensating for Drift?

Turner, Dorothea; Williams, D. Dudley

doi:10.1002/(sici)1522-2632(200004)85:2/3<141::aid-iroh141>3.3.co;2-g

Cited by 5 publications

(4 citation statements)

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“…Dispersal of aquatic stages of benthic invertebrate species is even more limited. For these, dispersal is generally believed to be more effective downstream because of passive drift Williams 1993, Turner andWilliams 2000); yet, drifting distances are typically short (Elliott 2003).…”

Section: Discussionmentioning

confidence: 99%

River restoration success depends on the species pool of the immediate surroundings

Sundermann

Stoll

Haase

2011

Ecological Applications

246

177

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Previous studies evaluating the success of river restorations have rarely found any consistent effects on benthic invertebrate assemblages. In this study, we analyzed data from 24 river restoration projects in Germany dating back 1 to 12 years and 1231 data sets from adjacent river reaches that lie within 0-5, 5-10, and 10-15 km rings centered on the restored sites. We calculated restoration success and recolonization potential of adjacent river reaches based on stream-type-specific subsets of taxa indicative for good or bad habitat quality. On average, the restorations did not improve the benthic invertebrate community quality. However, we show that restoration success depends on the presence of source populations of desired taxa in the surrounding of restored sites. Only where source populations of additional desired taxa existed within a 0-5 km ring around the restored sites were benthic invertebrate assemblages improved by the restoration. Beyond the 5-km rings, this recolonization effect was no longer detected. We present here the first field results to support the debated argument that a lack of source populations in the areas surrounding restored sites may play an important role in the failure to establish desired invertebrate communities by the means of river restorations. In contrast, long-range dispersal of invertebrates seems to play a subordinate role in the recolonization of restored sites. However, because the surroundings of the restored sites were far from good ecological quality, the potential for improvement of restored sites was limited.

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Section: Discussionmentioning

confidence: 99%

River restoration success depends on the species pool of the immediate surroundings

Sundermann

Stoll

Haase

2011

Ecological Applications

246

177

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“…This is because of both the uncertainty of event timing and of the practical difficulties in employing traditional capture-mark-recapture techniques (Southwood & Henderson, 2000;Turner & Williams, 2000). Molecular markers, such as allozymes and mitochondrial DNA, have been advocated as useful tools (Hogg et al, 1995;Hughes et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Habitat background selection by colonizing intermittent pond invertebrates

2007

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Habitat selection processes by organisms colonizing freshwater bodies have not been commonly studied, despite their obvious relevance to wetland ecology and management. We monitored, weekly, all organisms that appeared in tanks with different backgrounds (brown; white) and substrate/food availability treatments (control; added leaf litter; added algae) floating on the water surface of a natural intermittent pond. The experiment lasted for 14 weeks, from pond filling to pond drying, during which time we collected around 9,000 colonizing insects per m 2 (e.g., Diptera, Coleoptera, Hemiptera, and eggs) and a similar number of colonizing non-insects (e.g., Acari, Crustacea, Gastropoda, and ephippia). Non-insects exhibited greatest colonization early in the hydroperiod, correlated with major rain-fall events. Insect colonization was low at first, peaked in late May, and thereafter remained high until the pond dried. Most ovipositing female insects (especially chironomids) were attracted to tanks with a dark background or those containing decomposing dark leaves, although there were exceptions related to taxon (e.g., beetles) and hydroperiod. Non-insects showed treatment preferences similar to the insects, with cladoceran ephippia appearing more in the Leaf treatment. Colonization mechanisms were deemed 'active' for insects and largely 'passive' for the microcrustaceans, and the various possibilities for the latter (heavy rainfall, wind, wildlife) are discussed. For highly dispersive taxa, such as adults of the beetles Helophorus sp. and Anacaena sp. colonization densities at the pond surface were calculated to attain maxima of around 26 and 33 m -2 respectively, in early May.

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“…Temperature has significant influence on the growth and development of lotic insects, and as a result of faster nymphal development, earlier emergence is to be expected (Sweeney 1984). Likewise, Turner and Williams (2000), when studying the same spring, found that emergence commenced about one week earlier near the source than further downstream. The smaller size of adults emerging upstream may be a function of their earlier emergence relative to adults emerging downstream, which may in turn be a function of the higher minimum temperatures for nymphal development (Williams & Hogg 1988).…”

Section: Discussionmentioning

confidence: 99%

“…In addition to differences in the timing of emergence, between-site variation in body size could be the result of differences in food availability (Hawkins 1986). The downstream site may have greater food availability as N. trispinosa densities are lower (13.9 + 2.3 SE and 92.8 + 19.4 SE, respectively;Turner & Williams 2000). Differences in the total invertebrate densities or the presence/absence of species between channels appear to be unlikely influences, as Hogg and Williams (1996) found that taxon richness did not differ according to thermal regime, whereas densities were in fact lower in the experimental channel.…”

Section: Discussionmentioning

confidence: 99%

Sexual dimorphism and the influence of artificial elevated temperatures on body size in the imago ofNemoura trispinosa(Plecoptera: Nemouridae)

Turner

Williams

2005

Aquatic Insects

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Our study site was composed of a spring that was divided lengthwise from its source into two equally wide channels, with water temperature in the experimental channel being increased by 2.0 -3.58C relative to that of the control channel. We examined sexual dimorphism in overall body size and eight morphological traits in the stonefly Nemoura trispinosa Claassen, and whether body size varies according to site of emergence (upstream versus downstream) and/or the thermal regime in which they undergo nymphal development. Univariate tests showed that females were significantly larger than males in all eight traits, and multivariate analyses (Principal Components Analysis) demonstrated that females were larger in overall body size. Both univariate and multivariate tests showed that adults emerging from the control and downstream portions of the stream were larger than those from heated and upstream reaches, respectively. We discuss possible hypotheses contributing to the female-biased sexual dimorphism observed in this species.

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Invertebrate Movements within a Small Stream: Density Dependence or Compensating for Drift?

Cited by 5 publications

References 0 publications

River restoration success depends on the species pool of the immediate surroundings

River restoration success depends on the species pool of the immediate surroundings

Habitat background selection by colonizing intermittent pond invertebrates

Sexual dimorphism and the influence of artificial elevated temperatures on body size in the imago ofNemoura trispinosa(Plecoptera: Nemouridae)

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