Rotifers of temporary waters

Walsh, Elizabeth J.; Smith, Hilary A.; Wallace, Robert L.

doi:10.1002/iroh.201301700

Cited by 39 publications

(23 citation statements)

References 174 publications

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“…In addition, low grazing rates (less than 10% day −1 in the benthic layer) of individual feeding types in benthic water layers indicates suppression by higher concentrations of suspended organic matter (Gannon & Stemberger, 1978). Greater numbers of accessory species in HP3 as well as higher species diversity, compared to HP2, supports the assumption that some rotifers appear from sediment seed bank from the surrounding flooded area following inundation (Walsh, Smith, & Wallace, 2014 Karabin & Pontin, 1995). This result is presumably an outcome of the shift in phytoplankton community composition along hydroregime gradient and the availability of specific algae size-ranges targeted by Synchaeta species.…”

Section: Discussionmentioning

confidence: 92%

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

2017

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Rotifers display r‐strategy life‐histories and are adaptable to environmental disturbances. Although rotifers constitute a large proportion of zooplankton in river‐floodplain systems, the influence of hydrology on their assemblage has been poorly studied. We postulated that rotifer assemblage and grazing activities were controlled by mechanisms associated with hydrological conditions. We conducted a 5‐year study (Kopački Rit Nature Park, NE Croatia) to assess the influence of hydrology on (a) rotifer assemblage during different hydrological phases, (b) the vertical distribution of rotifer abundance, functional feeding guilds, and grazing intensity, and (c) the main drivers affecting rotifer assemblage in the floodplain lake. The results indicated that (a) during isolation, longer residence time and high phytoplankton biomass microfilter‐feeders (mIff) and macrofilter‐feeders (mAff) grazing rates were similar whereas predators (Pr) were the most efficient consumers, (b) during high flow pulses, high conductivity and variable water level governed rotifer grazing rates of mIff and mAff at a retion of 1:2 and a decline of Pr grazing activity, and (c) during the flood pulse, reduced phytoplankton biomasss still resulted in mAff and Pr domination of the community whereas mIff grazing activity remained at the same level. Under stable hydrological conditions algivorous species codominated with bacterivores and predators, suggesting an increased biodiversity and food web interactions. In contrast, throughout the inundation period, algivorous species predominated. However, differences in rotifer assemblage between normal flow and flood pulses indicated the importance of hydrology in shaping rotifer trophic structure through modifying lower trophic levels and the availability of food sources.

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Section: Discussionmentioning

confidence: 92%

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

2017

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“…The modeled back trajectories show that wind events in the Chihuahuan Desert deposited material in downwind collectors at UTEP. These sediments crossed dust-emitting ephemeral aquatic systems, including playas such as the Paleolake Palomas Basin, Mexico (Baddock et al 2016) and Lake Lucero (White Sands, New Mexico) (White et al 2015), centered 79 km and 112 km away from UTEP, respectively (Fig. 3).…”

Section: Discussionmentioning

confidence: 99%

Evidence for regional aeolian transport of freshwater micrometazoans in arid regions

Rivas

Mohl

Pelt³

et al. 2018

Limnol Oceanogr Letters

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While separated by large expanses of dry terrain unsuitable for aquatic biota, aridland waters possess high biodiversity. How aquatic micrometazoans disperse to, and colonize, these isolated ephemeral habitats are not well understood. We used a multi-faceted approach including wind tunnel and rehydration experiments, and next-generation sequencing to assess potential movement of diapausing propagules of aquatic invertebrates by anemochory across regional scales (102–105 km). Wind tunnel experiments using dry playa sediments with added micrometazoan propagules demonstrated that after entrainment by saltation and downwind transport were subsequently recoverable as viable animals when rehydrated. Further, rehydration of fallen natural dust yielded micrometazoans, including rotifers, gastrotrichs, microcrustaceans, and nematodes. Using conserved DNA primers, we identified >3,300 eukaryotic Operational Taxonomic Units (excluding fungi) in the dust including some taxa found in rehydration experiments. Thus, we provide strong evidence that anemochory can disperse micrometazoans among isolated, ephemeral ecosystems in North American deserts and likely elsewhere.

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“…While the literature is replete with examples of this phenomenon across a wide array of taxa, we recognise that artificial rehydration protocols, including ours, may not be suitable to initiate hatching of all viable propagules (May, ; Rivas et al., ; Vandekerkhove et al., ). Propagules may have a range of hatching conditions and bet‐hedging strategies have often been invoked to explain differential hatching patterns from lake sediments (García‐Roger, Serra, & Carmona, ; Walsh, Smith, & Wallace, ). Nevertheless, our study yielded a large number of taxa, including 91 events in which rotifers were present.…”

Section: Discussionmentioning

confidence: 99%

“…In a recent review of rotifers of temporary waters, Walsh et al. () noted that rotifers in ephemeral wetlands are likely to have a high dispersal capacity. This assessment was supported by the work of Rivas et al.…”

Section: Discussionmentioning

confidence: 99%

Anemochory of diapausing stages of microinvertebrates in North American drylands

et al. 2019

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Dry, ephemeral, desert wetlands are major sources of windblown sediment, as well as repositories for diapausing stages (propagules) of aquatic invertebrates. Zooplankton propagules are of the same size range as sand and dust grains. They can be deflated and transported in windstorm events. This study provides evidence that dust storms aid in dispersal of microinvertebrate propagules via anemochory (aeolian transport). We monitored 91 windstorms at six sites in the southwestern U.S.A. over a 17‐year period. The primary study site was located in El Paso, Texas in the northern Chihuahuan Desert. Additional samples were collected from the Southern High Plains region. Dust carried by these events was collected and rehydrated to hatch viable propagules transported with it. Using samples collected over a 6‐year period, 21 m above the ground, which included 59 storm events, we tested the hypothesis that transport of propagules is correlated with storm intensity by monitoring meteorological conditions such as storm duration, wind direction, wind speed, and particulate matter (PM10; fine dust concentration). An air quality monitoring site located adjacent to the dust samplers provided quantitative hourly measurements. Rehydration results from all events showed that ciliates were found in 92% of the samples, rotifers in 81%, branchiopods in 29%, ostracods in 4%, nematodes in 13%, gastrotrichs in 16%, and tardigrades in 3%. Overall, four bdelloid and 11 monogonont rotifer species were identified from rehydrated windblown dust samples. Principal component analysis indicated gastrotrichs, branchiopods, nematodes, tardigrades, and monogonont rotifer occurrence positively correlated with PM10 and dust event duration. Bdelloid rotifers were correlated with amount of sediment deposited. Non‐metric multidimensional scaling showed a significant relationship between PM10 and occurrence of some taxa. Zero‐inflated, general linear models with mixed‐effects indicated significant relationships with bdelloid and nematode transport and PM10. Thus, windstorms with high PM10 concentration and long duration are more likely to transport microinvertebrate diapausing stages in drylands.

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Rotifers of temporary waters

Cited by 39 publications

References 174 publications

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

Hydrology driven changes in the rotifer trophic structure and implications for food web interactions

Evidence for regional aeolian transport of freshwater micrometazoans in arid regions

Anemochory of diapausing stages of microinvertebrates in North American drylands

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