Hydrologic influences on soil properties along ephemeral rivers in the Namib Desert

Jacobson, Peter J.; Jacobson, Kathryn M.; Angermeier, Paul L.; Cherry, Donald S.

doi:10.1006/jare.1999.0619

Cited by 47 publications

(43 citation statements)

References 17 publications

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“…Vol. 69, 2007 Research Article 563 biogeochemical pathways than in saturated sediments (e.g., Boulton, 1991;Jacobson et al, 2000b). Moreover, some invertebrates that are common in flowing water can persist for long periods in dry river sediments, and recolonize the benthos soon after the onset of flow (Brock et al, 2003;Tronstadt et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Biogeochemical processes in ephemeral alluvial rivers and coarsegrained vadose systems are generally water-and organic carbon-limited (e.g., Kieft et al, 1993, Jacobson et al, 2000b. Inundation in ephemeral rivers and saturating recharge in vadose systems lead to ecological "hot moments" (Belnap et al, 2005;Holden and Fierer, 2005).…”

Section: Comparisons With Surface Soils and Vadose Zonesmentioning

confidence: 99%

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Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods

Datry²,

2007

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Inundation marks the shift from a terrestrial ecosystem to an aquatic ecosystem in ephemeral rivers. The forms and rates of responses by aquatic invertebrates and sediment microbes to inundation depend on desiccation resistance during preceding dry periods. We assessed invertebrate and microbial responses to inundation over a range of preceding dry periods in an ephemeral reach of the Selwyn River, New Zealand. Microbial response variables were dissolved oxygen consumption and non-specific esterase activity. Sampling sites along the reach had been continuously dry for 1-592 d prior to sample collection. The onset of flow simulated by an experimental inundation led to the appearance of aquatic invertebrates in all samples, but the assemblages varied with the length of the preceding dry period. Taxon richness decreased linearly with dry period length while density decreased exponentially. These patterns indicate that a large number of individuals from desiccation-sensitive taxa were eliminated soon after flow ceased, and a low-density assemblage composed of a small number of desiccation-resistant taxa persisted during prolonged dry periods. As with invertebrate density, sediment respiration and nonspecific esterase activity decreased with length of dry period, and were characterized by exponential decay functions. The results of the inundation experiments suggest that a temporal ecotone exists for about one week after the disappearance of flowing water, and before the terrestrial system stabilizes.

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Section: Discussionmentioning

confidence: 99%

Section: Comparisons With Surface Soils and Vadose Zonesmentioning

confidence: 99%

Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods

Datry²,

2007

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“…The abscised and withered leaves fall to the dry ground, where they may be fragmented by trampling, eaten by herbivores or transported away, either by the wind or the next flood (cf. Jacobson, 1997;Jacobson et al, 2000). Leaflitter was very rarely observed in the area, except on a sandy point bar downstream within the seep, where, ca.…”

Section: Study Localitymentioning

confidence: 95%

“…During the rainy season, these, together with the small leaves of B. albitrunca, M. parviflora, Combretum wattii, C. imberbe, C. multijuga, Grewia bicolor and T. prunioides (all in the range of leptophyll II and microphyll I to II) are likely to be the first leaves carried away from the litter layer by rising water, compared to bigger leaves. Furthermore, after water saturation and settling, recurrent floods can easily re-entrain these leaves, transporting them further downstream (Spicer, 1989;Jacobson et al, 2000).…”

Section: Leaf Size and Sortingmentioning

confidence: 99%

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Leaf-jams — A new and unique leaf deposit in the ephemeral Hoanib River, NW Namibia: Origin and plant taphonomic implications

Hofmann¹,

Rice²

2010

International Journal of Coal Geology

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Interactions between soil, rainfall, and wildlife drive surface water quality across a savanna ecosystem

Strauch

2012

Ecohydrology

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Surface water resources play an important role in the transportation of nutrients within and between regions. Water quality varies spatially across landscapes, but the extent of this variability and the interaction between water quality and wildlife are not well‐known. In some savannas, heterogeneous climatic and geologic patterns result in gradients of precipitation and soil nutrients, leading to temporal and regional differences in soil and vegetation quality. Wildlife utilise these seasonal patterns, influencing soil nutrient dynamics and vegetation. However, the impact of seasonally abundant wildlife, climate, and soils on surface water quality is unknown in savannas. Fluctuations in surface water quality were measured across the Serengeti ecosystem at 6‐month intervals, and the influence of rainfall, watershed, and seasonal wildlife migration were then modelled. The results suggest that although soil composition in watersheds influences the concentration of soil‐derived nutrients in rivers, rainfall and wildlife have a significant effect on the seasonal concentrations of most nutrients. The role of migratory wildlife in surface water quality in some watersheds is likely dampened by the large influence of resident species across seasons and habitats. The alteration of rainfall patterns by climate change is expected to influence nutrient transport into savanna rivers. Copyright © 2012 John Wiley & Sons, Ltd.

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Hydrologic influences on soil properties along ephemeral rivers in the Namib Desert

Cited by 47 publications

References 17 publications

Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods

Invertebrate and microbial responses to inundation in an ephemeral river reach in New Zealand: effects of preceding dry periods

Leaf-jams — A new and unique leaf deposit in the ephemeral Hoanib River, NW Namibia: Origin and plant taphonomic implications

Interactions between soil, rainfall, and wildlife drive surface water quality across a savanna ecosystem

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