Do fluctuating water levels alter nest survivorship in reservoir shrubs?

Oort, Harry van; Green, David J.; Hepp, Matthew; Cooper, John M.

doi:10.1650/condor-14-154.1

Cited by 6 publications

(9 citation statements)

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“…The degree to which reservoir operations have direct negative effects on nest success will depend on nest elevation and the timing of breeding relative to the operations of the reservoir (van Oort et al 2015). We show that even for a shrub-nesting species for which reservoir operations have little impact on nest success (Quinlan andGreen 2012, van Oort et al 2015), inundation of breeding habitat can have negative effects on productivity by reducing postfledging juvenile survival.…”

Section: Discussionmentioning

confidence: 78%

“…1c, d) and are controlled by operations (both for hydroelectric and flood control purposes) at Keenleyside Dam downstream and Revelstoke and Mica Dams upstream of the reservoir. Water levels typically start to rise in late May and June and peak in July, but the timing of the rise and the maximum water level in the reservoir varies across years (Green et al 2011, van Oort et al 2015. Yellow Warblers may therefore settle, and initiate breeding, on territories that are above the waterline, but end the season on territories that are partially or completely inundated by water.…”

Section: Study Species and Field Site Locationmentioning

confidence: 99%

“…Changes in water flow and flooding regimes can have significant direct and indirect effects on avian populations. For example, management of water flow that causes water levels to rise during the breeding season can flood nests located both on the ground, e.g., Piping Plover (Charadrius melodus; Anteau et al 2012) and Common Loon (Gavia immer; Windels et al 2013), and in shrubs, e.g., Pygmy Cormorant (Phalacrocorax pygmeus; Nazirides and Papageorgiou 1996) and Yellow Warbler (Setophaga petechia; van Oort et al 2015). Manipulation of flooding regimes can also cause changes in vegetation structure and composition and therefore the location and amount of available breeding habitat (Ellis et al 2009, Hatten et al 2010.…”

Section: Introductionmentioning

confidence: 99%

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Postfledging survival and local recruitment of a riparian songbird in habitat influenced by reservoir operations

Hepp¹,

Ware²,

Oort³

et al. 2018

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ABSTRACT. The impact of anthropogenic activities on breeding bird populations are typically assessed using nest success despite the importance of the postfledging period and juvenile survival for the population dynamics of many birds. Using a combination of radio telemetry data collected between 2012 and 2014, and long-term monitoring data collected between 2005 and 2016, we evaluated whether postfledging survival of Yellow Warblers (Setophaga petechia) is affected when their riparian nesting habitat becomes inundated by the Upper Arrow Lakes Reservoir in the Columbia River Valley near Revelstoke, British Columbia, Canada. Thirty-eight percent of radiotagged fledglings (n = 26) survived for at least 21 days after leaving the nest. Radio-tagged birds that fledged from nests in territories that were inundated by water tended to be have lower survival than those that fledged from nests in territories that were not inundated by water. Local recruitment was low (6.4%, n = 438). Local recruitment was nevertheless positively affected by nestling condition prior to fledging. Fledglings from territories that were not inundated by water also tended to be more likely to recruit locally than those that fledged from territories that were inundated by water. In both cases, we estimated that reservoir operations that flooded habitat reduced postfledging survival or local recruitment by approximately 50%. Our study emphasizes the importance of considering the postfledging period when developing mitigation measures or management plans aimed at minimizing the impact of anthropogenic activities on bird populations. Survie des jeunes après l'envol et recrutement local d'un passereau ripicole nichant dans un habitat touché par la régulation du niveau d'eau d'un réservoirRÉSUMÉ. Les impacts qu'ont les activités anthropiques sur les populations d'oiseaux nicheurs sont habituellement évalués à partir du succès de nidification, malgré l'importance de la période suivant l'envol des jeunes et la survie juvénile dans la dynamique de population de nombreux oiseaux. En combinant des données de radiotélémétrie obtenues entre 2012 et 2014 et des données provenant d'un suivi réalisé de 2005 à 2016, nous avons évalué dans quelle mesure la survie après l'envol des jeunes de Paruline jaune (Setophaga petechia) était affectée lorsque leur habitat de nidification se trouve inondé par le réservoir Upper Arrow Lakes dans la vallée du fleuve Columbia près de Revelstoke, Colombie-Britannique, Canada. Trente-huit pourcent des jeunes munis d'un émetteur (n = 26) ont survécu au moins 21 jours après avoir quitté le nid. La survie des jeunes ayant pris leur envol de nids situés sur des territoires ayant été inondés était généralement plus faible que celle des oiseaux ayant pris leur envol de nids situés sur des territoires n'ayant pas été inondés. Le recrutement local était faible (6,4 %, n = 438). Néanmoins, le recrutement local était positivement lié à la condition des jeunes avant l'envol. Les jeunes ayant pris leur envol dans les territoires non inondés ...

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Section: Discussionmentioning

confidence: 78%

Section: Study Species and Field Site Locationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Postfledging survival and local recruitment of a riparian songbird in habitat influenced by reservoir operations

Hepp¹,

Ware²,

Oort³

et al. 2018

ACE

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“…full pool) and are controlled by operations (both for hydroelectric and flood control purposes) at Hugh Keenleyside Dam downstream and Revelstoke Dam upstream of the reservoir. Water levels typically rise in May and June and peak in July, but the timing of the rise and the maximum water level in the reservoir varies across years [ 16 ]. Historical daily water level data for Arrow Lakes Reservoir (station 08NE104) can be downloaded from https://wateroffice.ec.gc.ca .…”

Section: Study Site and Speciesmentioning

confidence: 99%

“…Studies that monitor nests can document flooding (e.g. [ 15 ]), but need to evaluate the extent to which flooding reduces nest success that may also fail for other reasons [ 16 ], allow for the possibility that individuals of multi-brooded species can re-nest, and incorporate reservoir operation effects on the survival of fledglings [ 17 ]. Long-term monitoring studies of species of concern can sometimes document changes in annual productivity associated with variation in the management of reservoir water levels (e.g.…”

Section: Introductionmentioning

confidence: 99%

Predicting the effects of reservoir water level management on the reproductive output of a riparian songbird

et al. 2021

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Dams and reservoirs alter natural water flow regimes with adverse effects on natural ecosystems. Quantifying and reducing these effects are important as global demands for energy and water, and the number of dams and reservoir, increase. However, costs and logistic constraints typically preclude experimental assessment of reservoir effects on the environment. We developed a stochastic individual-based model (IBM), parameterized using empirical data, to estimate the annual productivity of yellow warblers that breed in riparian habitat within the footprint of the Arrow Lakes Reservoir in British Columbia, Canada. The IBM incorporated information on breeding phenology, nest site selection, brood parasitism, daily nest survival, re-nesting probabilities and post-fledging survival. We used the IBM to estimate the effect of four different water management scenarios on annual productivity. We found that the IBM accurately estimated average nest success (0.39 ± 0.10 SD), the proportion of females that produced at least one fledgling during a breeding season (0.56 ± 0.11), and annual fledging success (2.06 ± 0.43) under current conditions. The IBM estimated that reservoir operations currently reduce the annual productivity of this population by 37%, from an average of 1.62 to 1.06 independent young/female. Delaying when reservoir water levels reach 435m asl (the minimum elevation occupied by yellow warblers) by approximately 2 weeks was predicted to increase annual productivity to 1.44 independent young/female. The standardized effect on annual productivity of reducing the maximum elevation of the reservoir so that yellow warbler habitat is not inundated (Cohen’s d = 1.52) or delaying when water is stored (Cohen’s d = 0.83) was primarily driven by inundation effects on post-fledging survival. Reservoir operation effects on breeding birds will be species specific, but this IBM can easily be modified to allow the environmental impacts on the entire breeding bird community to be incorporated into water management decisions.

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River food chains lead to riparian bats and birds in two mid‐order rivers

Jackson¹,

Stock²,

Harris

et al. 2020

Ecosphere

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River regulation can modify natural flow regimes with deleterious effects on aquatic communities. While the effects of flow manipulation on the physical environment and populations and assemblages of aquatic organisms have been described thoroughly, how and to what extent river regulation influences ecosystem processes like food web architecture is less studied. Emergent aquatic insect prey can provide an important food resource to riparian consumers like birds and bats with concomitant consequences for nutrient cycling through aquatic-terrestrial food webs, thus potentially increasing the spatial influence of river regulation into the riparian zone and beyond. We used naturally abundant stable isotopes of carbon and nitrogen to compare food web architecture (trophic position and reliance on an aquatic nutritional pathway) leading to birds and bats between a regulated river, the Tuolumne River downstream of Hetch Hetchy Reservoir, and an adjacent unregulated river, the Merced River, located in Yosemite National Park on the west slope of the Sierra Nevada, California, USA. We found that both birds and bats derived >50% of their nutrition from food webs originating in photosynthesis by algae. In addition, birds and bats occupied a similar trophic position to predatory fish in other systems. Both birds and bats seemed to rely more strongly on an aquatic nutritional pathway during the dryer year of our study period, underscoring the potential importance of emergent aquatic prey as a water subsidy in dry systems and in dry years. In the Tuolumne River, reservoir managers strive to simulate characteristics of the natural flow regime, including seasonal scouring flows and prolonged floodplain inundation. Although we found no conclusive evidence of an effect of river regulation on food web responses, our study suggests that nutrient cycling through aquatic-terrestrial food webs expands the potential influence of river regulation to organisms and ecosystems typically characterized as terrestrial.

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Do fluctuating water levels alter nest survivorship in reservoir shrubs?

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 6 publications

References 35 publications

Postfledging survival and local recruitment of a riparian songbird in habitat influenced by reservoir operations

Postfledging survival and local recruitment of a riparian songbird in habitat influenced by reservoir operations

Predicting the effects of reservoir water level management on the reproductive output of a riparian songbird

River food chains lead to riparian bats and birds in two mid‐order rivers

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