2022
Rossi, G; Power, ME; Carlson, SM; Grantham, TE
Seasonal growth potential of Oncorhynchus mykiss in streams with contrasting prey phenology and streamflow Journal Article
In: Ecosphere, 2022.
Links | BibTeX | Tags: ERCZO, predator-prey dynamics, steelhead/rainbow trout, streams
@article{Rossi2022,
title = {Seasonal growth potential of Oncorhynchus mykiss in streams with contrasting prey phenology and streamflow},
author = {G Rossi and ME Power and SM Carlson and TE Grantham},
url = {https://angelo.berkeley.edu/ecs24211/},
doi = {https://doi.org/10.1002/ecs2.4211},
year = {2022},
date = {2022-06-16},
urldate = {2022-06-16},
journal = {Ecosphere},
keywords = {ERCZO, predator-prey dynamics, steelhead/rainbow trout, streams},
pubstate = {published},
tppubtype = {article}
}
2020
Uno, Hiromi; Pneh, Shelley
In: Ecological Research, vol. 35, no. 3, pp. 474-481, 2020.
Abstract | Links | BibTeX | Tags: diversity, ecological function, ERCZO, predator-prey dynamics, Riparian, STREAM
@article{Uno2020b,
title = {Effect of source habitat spatial heterogeneity and species diversity on the temporal stability of aquatic‐to‐terrestrial subsidy by emerging aquatic insects},
author = {Hiromi Uno and Shelley Pneh},
doi = {10.1111/1440-1703.12125},
year = {2020},
date = {2020-05-25},
journal = {Ecological Research},
volume = {35},
number = {3},
pages = {474-481},
abstract = {Duration and temporal stability of resource subsidy largely affect the response of recipient communities. Factors that influence the temporal dynamics of resource subsidy from aquatic‐to‐terrestrial habitats by emerging aquatic insects were examined in this study. By measuring the flux of aquatic insect emergence from six habitats in a river over summer, we found that the timing of emergence varied by habitats for each dominant taxa, and that different species emerged at different times of the summer sequentially. We found that spatial variation in the emergence timing caused by the spatial heterogeneity of the water temperature, and so on in the source habitat can temporally stabilize the subsidy of each species from the whole river. Similarly, we found that the variation in emergence timing between species contributed to the temporal stability of subsidies from each habitat. The contribution of spatial heterogeneity to the temporal stability varied by the focal species and the contribution of species diversity varied by habitats. This study demonstrates how the ecological function of spatial heterogeneity and species diversity crosses the boundary of ecosystems by temporally stabilizing resource subsidies.},
keywords = {diversity, ecological function, ERCZO, predator-prey dynamics, Riparian, STREAM},
pubstate = {published},
tppubtype = {article}
}
Duration and temporal stability of resource subsidy largely affect the response of recipient communities. Factors that influence the temporal dynamics of resource subsidy from aquatic‐to‐terrestrial habitats by emerging aquatic insects were examined in this study. By measuring the flux of aquatic insect emergence from six habitats in a river over summer, we found that the timing of emergence varied by habitats for each dominant taxa, and that different species emerged at different times of the summer sequentially. We found that spatial variation in the emergence timing caused by the spatial heterogeneity of the water temperature, and so on in the source habitat can temporally stabilize the subsidy of each species from the whole river. Similarly, we found that the variation in emergence timing between species contributed to the temporal stability of subsidies from each habitat. The contribution of spatial heterogeneity to the temporal stability varied by the focal species and the contribution of species diversity varied by habitats. This study demonstrates how the ecological function of spatial heterogeneity and species diversity crosses the boundary of ecosystems by temporally stabilizing resource subsidies.
1996
Power, Mary E.; Dietrich, WIlliam E.; Finlay, Jacques C.
Dams and downstream aquatic biodiversity: Potential food web consequences of hydrologic and geomorphic change Journal Article
In: Environmental Management, vol. 20, no. 6, pp. 887-895, 1996, ISSN: 0364-152X.
Abstract | Links | BibTeX | Tags: dams, food webs, hydrologic disturbance, predator-prey dynamics, succession
@article{Power1996,
title = {Dams and downstream aquatic biodiversity: Potential food web consequences of hydrologic and geomorphic change},
author = {Mary E. Power and WIlliam E. Dietrich and Jacques C. Finlay},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Power_EnvironmentalManagment1996.pdf},
doi = {10.1007/BF01205969},
issn = {0364-152X},
year = {1996},
date = {1996-11-00},
journal = {Environmental Management},
volume = {20},
number = {6},
pages = {887-895},
abstract = {Responses of rivers and river ecosystems to dams are complex and varied, as they depend on local sediment supplies, geomorphic constraints, climate, dam structure and operation, and key attributes of the biota. Therefore, ''one-size-fits-all'' prescriptions cannot substitute for local knowledge in developing prescriptions for dam structure and operation to protect local biodiversity. One general principle is self-evident: that biodiversity is best protected in rivers where physical regimes are the most natural. A sufficiently natural regime of flow variation is particularly crucial for river biota and food webs. We review our research and that of others to illustrate the ecological importance or alternating periods of low and high flow, of periodic bed scour, and of floodplain inundation and dewatering. These fluctuations regulate both the life cycles of river biota and species interactions in the food webs that sustain them. Even if the focus of biodiversity conservation efforts is on a target species rather than whole ecosystems, a food web perspective is necessary, because populations of any species depend critically on how their resources, prey, and potential predators also respond to environmental change. In regulated rivers, managers must determine how the frequency, magnitude, and timing of hydrologic events interact to constrain or support species and food webs. Simple ecological modeling, tailored to local systems, may provide a framework and some insight into explaining ecosystem response to dams and should give direction to mitigation efforts.},
keywords = {dams, food webs, hydrologic disturbance, predator-prey dynamics, succession},
pubstate = {published},
tppubtype = {article}
}
Responses of rivers and river ecosystems to dams are complex and varied, as they depend on local sediment supplies, geomorphic constraints, climate, dam structure and operation, and key attributes of the biota. Therefore, ”one-size-fits-all” prescriptions cannot substitute for local knowledge in developing prescriptions for dam structure and operation to protect local biodiversity. One general principle is self-evident: that biodiversity is best protected in rivers where physical regimes are the most natural. A sufficiently natural regime of flow variation is particularly crucial for river biota and food webs. We review our research and that of others to illustrate the ecological importance or alternating periods of low and high flow, of periodic bed scour, and of floodplain inundation and dewatering. These fluctuations regulate both the life cycles of river biota and species interactions in the food webs that sustain them. Even if the focus of biodiversity conservation efforts is on a target species rather than whole ecosystems, a food web perspective is necessary, because populations of any species depend critically on how their resources, prey, and potential predators also respond to environmental change. In regulated rivers, managers must determine how the frequency, magnitude, and timing of hydrologic events interact to constrain or support species and food webs. Simple ecological modeling, tailored to local systems, may provide a framework and some insight into explaining ecosystem response to dams and should give direction to mitigation efforts.