Influence of mild to severe flow alterations on invertebrates in three mountain streams

Rader, Russell B.; Belish, Timberley A.

doi:10.1002/(sici)1099-1646(199907/08)15:4<353::aid-rrr551>3.0.co;2-u

Cited by 88 publications

(96 citation statements)

References 29 publications

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“…homogenized flow regimes below hydropower dams; Poff et al 1997) or less predictable (e.g. irregular drought occurrence due to water diversion; Rader & Belish 1999) than those occurred previously. Organisms that rely on predictable hydrological cycles to complete their life cycles, such as salmonids (Quinn & Adams 1996;Quinn et al 2000), may be particularly at risk from these changes.…”

Section: Discussionmentioning

confidence: 99%

Evolution of aquatic insect behaviours across a gradient of disturbance predictability

2007

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Natural disturbance regimes-cycles of fire, flood, drought or other events-range from highly predictable (disturbances occur regularly in time or in concert with a proximate cue) to highly unpredictable. While theory predicts how populations should evolve under different degrees of disturbance predictability, there is little empirical evidence of how this occurs in nature. Here, we demonstrate local adaptation in populations of an aquatic insect occupying sites along a natural gradient of disturbance predictability, where predictability was defined as the ability of a proximate cue (rainfall) to signal a disturbance (flash flood). In controlled behavioural experiments, populations from predictable environments responded to rainfall events by quickly exiting the water and moving sufficiently far from the stream to escape flash floods. By contrast, populations from less predictable environments had longer response times and lower response rates, reflecting the uncertainty inherent to these environments. Analysis with signal detection theory showed that for 13 out of 15 populations, observed response times were an optimal compromise between the competing risks of abandoning versus remaining in the stream, mediated by the rainfall-flood correlation of the local environment. Our study provides the first demonstration that populations can evolve in response to differences in disturbance predictability, and provides evidence that populations can adapt to among-stream differences in flow regime.

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Section: Discussionmentioning

confidence: 99%

Evolution of aquatic insect behaviours across a gradient of disturbance predictability

2007

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“…The formerly broad, open channel of the South Platte now meanders between thickly vegetated banks, and migratory birds that rely on open sandbars for feeding and resting are now restricted to short reaches of the river. Although flow diversions have generally had less physical effect on mountain streams in the South Platte basin, aquatic and riparian organisms have been affected by changes in the timing and magnitude of flow associated with diversions (Merritt 1999, Rader andBelish 1999).…”

Section: Flow Diversion and Regulationmentioning

confidence: 99%

“…Detailed studies of the habitat requirements of various aquatic and riparian species native to the rivers of the Colorado Front Range are ongoing (Merritt 1999, D. Pepin, personal communication). Results to date suggest that some native species such as the cutthroat trout would have wider geographic distributions if they did not have to compete with introduced species, whereas other organisms, such as the river birch (Betula fontinalis; Merritt 1999, Merritt andWohl 2006) or macroinvertebrates (Rader and Belish 1999), are compromised primarily because of physical changes such as altered flow regime.…”

Section: Change From Reference Conditions: Compromised Rivers?mentioning

confidence: 99%

Compromised Rivers: Understanding Historical Human Impacts on Rivers in the Context of Restoration

Wohl¹

2005

E&S

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ABSTRACT. A river that preserves a simplified and attractive form may nevertheless have lost function. Loss of function in these rivers can occur because hydrologic and geomorphic processes no longer create and maintain the habitat and natural disturbance regimes necessary for ecosystem integrity. Recognition of compromised river function is particularly important in the context of river restoration, in which the public perception of a river's condition often drives the decision to undertake restoration as well as the decision about what type of restoration should be attempted. Determining the degree to which a river has been altered from its reference condition requires a knowledge of historical land use and the associated effects on rivers. Rivers of the Front Range of the Colorado Rocky Mountains in the United States are used to illustrate how historical land uses such as beaver trapping, placer mining, tie drives, flow regulation, and the construction of transportation corridors continue to affect contemporary river characteristics. Ignorance of regional land use and river history can lead to restoration that sets unrealistic goals because it is based on incorrect assumptions about a river's reference condition or about the influence of persistent land-use effects.

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“…Dans les Pyrénées, les abondances de truite commune sont étroitement reliées aux conditions environnementales . De nombreuses études sur les impacts de l'hydroélectricité ont montré une affectation des caractéristiques physiques des cours d'eau (KRAFT, 1972), des perturbations de la structure des populations de poissons (HOOPER, 1973in STALNAKER, 1979MANN, 1988 ;LAUTERS, 1992) et des populations d'invertébrés benthiques (BOON, 1988 ;CEREGHINO et LAVANDIER, 1997 ;RADER et BELISH, 1999). En situation de débit réservé, la réduction de la surface mouillée, des vitesses de courant et des profondeurs engendrent une moindre disponibilité en habitats, notamment en habitats énergétiquement favorables à la nutrition (BRAATEN et al, 1997).…”

Section: Influences Des Modifications Artificielles De Débitunclassified

“…En situation de débit réservé, la réduction de la surface mouillée, des vitesses de courant et des profondeurs engendrent une moindre disponibilité en habitats, notamment en habitats énergétiquement favorables à la nutrition (BRAATEN et al, 1997). Couplée à une disponibilité trophique souvent plus réduite dans ces secteurs (RADER et BELISH, 1999), ceci peut perturber l'alimentation des Salmonidés et influencer négativement leur croissance (FILBERT et HAWKINS, 1995). Cette altération des conditions trophiques en secteur de débit réservé, pourrait expliquer qu'à température moyenne estivale équivalente, la taille moyenne à 3 ans soit plus faible pour les sites soumis à un débit réservé.…”

Section: Influences Des Modifications Artificielles De Débitunclassified

Taille À 3 Ans De La Truite Commune (Salmo Trutta L.) Dans Les Rivières Des Pyrénées Françaises : Relations Avec Les Caractéristiques Mésologiques Et Influence Des Aménagements Hydroélectriques.

Lagarrigue

Baran

Delacoste³

et al. 2001

Bull. Fr. Pêche Piscic.

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RÉSUMÉLa croissance de populations de truite commune (Salmo trutta L.) a été étudiée sur 84 cours d'eau répartis sur l'ensemble de la chaîne des Pyrénées. Pour cela, des échantillons d'écailles ont été récoltés dans 215 sites situés à des altitudes comprises entre 185 et 2000 m, pour des largeurs variant de 1,2 à 60 m. La croissance des individus a été déterminée par scalimétrie. La longueur totale moyenne atteinte par les individus à l'âge de 3 ans a été retenue comme variable biologique.La taille moyenne à 3 ans des individus est fortement structurée par l'altitude, ce gradient altitudinal représentant en grande partie un gradient thermique. Elle est corrélée négativement avec l'altitude et la densité totale en truites communes et positivement avec la largeur du cours d'eau et la conductivité estivale.La nature du débit joue également un rôle important sur la croissance puisqu'à altitude et à température moyenne estivale équivalentes, la taille moyenne à 3 ans est significativement plus faible en site soumis à un débit réservé qu'en site à débit naturel.Selon la nature du débit, deux modèles prédictifs de la taille moyenne à 3 ans (T 3 ) en fonction de l'altitude (ALT) et de la largeur du cours d'eau (L) ont été établis par régression multiple pas à pas :-sites à débit naturel : Log (T 3 ) = 2.457 -0.007 x ALT + 0.066 x Log (L) 65.5 % (p < 0.01) de variance expliquée dont 61.6 % (p < 0.01) par l'altitude et 3.9 % (p < 0.01) par la largeur.-sites à débit réservé : Log (T 3 ) = 2.432 -0.009 x ALT + 0.087 x Log (L) 53.5 % (p < 0.01) de variance expliquée dont 47 % (p < 0.01) par l'altitude et 6.5 % (p < 0.05) par la largeur. TOTAL LENGTH OF AGE-3 BROWN TROUT (SALMO TRUTTA L.) IN FRENCH PYRENEAN STREAMS : RELATIONSHIPS WITH ENVIRONMENTAL FACTORS AND INFLUENCE OF HYDROELECTRIC FACILITIES. ABSTRACTThe growth of brown trout (Salmo trutta L.) populations has been studied on 84 streams distributed over the whole range of the Pyrenees. Samples of scales were collected in 215 sites located at altitudes ranging between 185 and 2000 m, for width varying from 1,2 to 60 m. The growth of individuals was determined by scale reading. The mean total length of age-3 trout was selected as the biological variable.The mean total length of age-3 trout was strongly structured by altitude, this altitudinal gradient mainly representing a thermal gradient. It is negatively correlated with altitude and total density of brown trout and positively correlated with stream width and summer conductivity.The nature of the flow regime also plays a major role on the growth since at equivalent altitude and equivalent mean summer temperature, the mean total length of age-3 trout is significantly lower in sites below dams with constant reduced flow than in site with natural flow.According to the nature of the flow, two predictive models of the mean total length of age-3 trout (T 3 ), which take into account altitude (ALT) and width of the river (L), were established by stepwise linear multiple regression analysis : -sites with natural flow : Log (T ...

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Influence of mild to severe flow alterations on invertebrates in three mountain streams

Cited by 88 publications

References 29 publications

Evolution of aquatic insect behaviours across a gradient of disturbance predictability

Evolution of aquatic insect behaviours across a gradient of disturbance predictability

Compromised Rivers: Understanding Historical Human Impacts on Rivers in the Context of Restoration

Taille À 3 Ans De La Truite Commune (Salmo Trutta L.) Dans Les Rivières Des Pyrénées Françaises : Relations Avec Les Caractéristiques Mésologiques Et Influence Des Aménagements Hydroélectriques.

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