The hyporheic refuge hypothesis reconsidered: A …
Additional keywords: epigean, hyporheic refuge hypothesis, macroinvertebrate, refugia, refugium.
(the hyporheic refuge hypothesis).
Both deterministic and stochastic processes may shape bacterial communities in opposing ways. Larger, more severe periods of flood or drought may support regional colonists from surrounding watershed sources during flood and select for specialists when conditions become unfavourable (that is, determinism), whereas less-severe events are evidence of random, stochastic processes within a watershed. Therefore, hypothetically, we predict that hyporheic bacterial taxa may range in type from generalist to specialist along a gradient of connectivity and patchiness in the hyporheic zone (). Disturbance events, such as gradients of surface water flow and cessation, and their impacts on stream biota depend largely on the severity and timing of the event (; ) and are becoming increasingly common stressors to perennial streams. In particular, sediment biological communities are affected by flood and drought through the creation of localized wet and dry refugia (). Few hypotheses have addressed the consequence of intermittency on hyporheic bacteria, and current theories for larger biota (for example, macroinvertebrates) do not apply to bacteria and other microbes. The hyporheic refuge hypothesis, for example, first proposed by and tested by others (; ; ), predicted that macroinvertebrate biota migrate deeper into streambed sediments when conditions on the stream surface become unfavourable. For microbial communities, such a theory requires revising as the physical factors influencing their assembly and distribution are different.
This review proposes a framework of hypotheses, based on the recognition of hyporheic flowpaths across several scales and predicting the highest refugial capacity in large-scale upwelling zones.
The hyporheic refuge hypothesis reconsidered: a ..
The hyporheic zone (HZ) is thought to serve multiple functions for lotic invertebrates, but its role in the persistence of benthic assemblages after disturbances (‘hyporheic refuge hypothesis’, HRH) has never been clearly demonstrated since its initial proposal in 1953. Water exchanges through the HZ appear to be crucial in determining most hyporheic processes and subsequently, in controlling directly or indirectly the distribution of hyporheic assemblages. At present, it seems that the distribution of hyporheic refugia would also be controlled by hyporheic flowpaths, explaining the non-uniform response to the HRH documented in the literature. In light of recent developments in hyporheic hydrology, it is timely to propose research directions for understanding the distribution and patchiness of hyporheic refugia. This review proposes a framework of hypotheses, based on the recognition of hyporheic flowpaths across several scales and predicting the highest refugial capacity in large-scale upwelling zones. Outcomes from this framework include the development of physical indicators measuring the ability of the HZ to protect invertebrates, the identification of river areas demonstrating the highest refuge capacity (hyporheic hotspots) and the promotion in restoration projects of suitable hydrologic exchanges for enhancing the development of hyporheic hotspots.
a test of the hyporheic refuge hypothesis
The hyporheic refuge hypothesis …
a test of the hyporheic refuge hypothesis.
The hyporheic refuge hypothesis reconsidered: a review of hydrological aspects Marie-José Dole-Olivier
The hyporheic refuge hypothesis ..
20/12/2017 · Response of Invertebrates to Lotic Disturbances - A Test of the Hyporheic Refuge Hypothesis
CSIRO PUBLISHING | Marine and Freshwater Research
Response of invertebrates to lotic disturbance: a test of the hyporheic refuge hypothesis
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