scholarly journals A critical analysis of regulated river ecosystem responses to managed environmental flows from reservoirs

2014 ◽  
Vol 60 (2) ◽  
pp. 410-425 ◽  
Author(s):  
Ben R. Gillespie ◽  
Simon Desmet ◽  
Paul Kay ◽  
Martin R. Tillotson ◽  
Lee E. Brown
Keyword(s):  
Critical Analysis ◽  
Environmental Flows ◽  
Regulated River ◽  
River Ecosystem ◽  
Ecosystem Responses

Response of a floodplain fish community to river-floodplain connectivity: natural versus managed reconnection

2014 ◽  
Vol 71 (2) ◽  
pp. 236-245 ◽  
Author(s):  
R.J. Stoffels ◽  
K.R. Clarke ◽  
R.A. Rehwinkel ◽  
B.J. McCarthy
Keyword(s):  
Native Species ◽  
Fish Community ◽  
Large Scale ◽  
Environmental Flows ◽  
Regulated River ◽  
Pest Species ◽  
Fish Community Structure ◽  
River Floodplain ◽  
Natural Connection ◽  
Flood Pulses

To restore lateral connectivity in highly regulated river-floodplain systems, it has become necessary to implement localized, “managed” connection flows, made possible using floodplain irrigation infrastructure. These managed flows contrast with “natural”, large-scale, overbank flood pulses. We compared the effects of a managed and a natural connection event on (i) the composition of the large-bodied fish community and (ii) the structure of an endangered catfish population of a large floodplain lake. The change in community composition following the managed connection was not greater than that exhibited between seasons or years during disconnection. By contrast, the change in fish community structure following the natural connection was much larger than that attributed to background, within- and between-year variability during disconnection. Catfish population structure only changed significantly following the natural flood. While the natural flood increased various population rates of native fishes, it also increased those of non-native carp, a pest species. To have a positive influence on native biodiversity, environmental flows may need to be delivered to floodplains in a way that simulates the properties of natural flood pulses. A challenge, however, will be managing river-floodplain connectivity to benefit native more than non-native species.

Preliminary evidence suggests freshwater turtles respond positively to an environmental water delivery during drought

2016 ◽  
Vol 64 (5) ◽  
pp. 370 ◽  
Author(s):  
K. Howard ◽  
L. Beesley ◽  
K. Ward ◽  
D. Stokeld
Keyword(s):  
Body Condition ◽  
Environmental Flows ◽  
Environmental Water ◽  
Preliminary Evidence ◽  
Regulated River ◽  
Management Tool ◽  
Freshwater Turtles ◽  
Catch Per Unit Effort ◽  
Chelodina Longicollis ◽  
Average Body

Environmental flows (e-flows) are a common management tool to improve the health of flow-regulated river systems and their biota. The effect of e-flows on fish, waterbirds and vegetation has been assessed in Australia, but their influence on turtles remains largely unstudied. We opportunistically examined the effect of e-flows on the eastern long-necked turtle (Chelodina longicollis), a species that occupies ephemeral aquatic habitats, by measuring an index of abundance (catch per unit effort) and body condition before and after an environmental watering event that replenished a severely contracted creek in the mid-Murray region. We found that average body condition increased after watering. Abundance decreased markedly after watering, but the change was not statistically significant. While the causal inference of our study was limited by the opportunistic nature of our before-after experimental design, this study provides preliminary evidence that environmental flows may improve the health of turtles occupying ephemeral floodplain habitats. We encourage further research into the effect of e-flows on turtles to confirm the hypothesis that the increase in average body condition recorded in the current study was a function of e-flows.

A simple channel complexity metric for analyzing river ecosystem responses

River Systems ◽  
2011 ◽  
Vol 19 (4) ◽  
pp. 327-335 ◽  
Author(s):  
Brian J. O'Neill ◽  
James H. Thorp
Keyword(s):  
River Ecosystem ◽  
Ecosystem Responses ◽  
Channel Complexity

Inter-annual variability of a zooplankton community: the importance of summer concentrated rainfall in a regulated river ecosystem

2011 ◽  
Vol 34 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Jong-Yun Choi ◽  
Kwang-Seuk Jeong ◽  
Geung-Hwan La ◽  
Hyun-Woo Kim ◽  
Kwang-Hyun Chang ◽  
...  
Keyword(s):  
Zooplankton Community ◽  
Regulated River ◽  
River Ecosystem ◽  
Annual Variability

379: A Critical Analysis of the Interpretation of Biochemical Recurrence in Surgically Treated Patients using the Revised ASTRO Criterion–"NADIR +2"

2007 ◽  
Vol 177 (4S) ◽  
pp. 126-126
Author(s):  
Matthew E. Nielsen ◽  
Danil V. Makarov ◽  
Elizabeth B. Humphreys ◽  
Leslie A. Mangold ◽  
Alan W. Partin ◽  
...  
Keyword(s):  
Biochemical Recurrence ◽  
Critical Analysis

Effectiveness of Programs for the Prevention of Child Sexual Abuse

2020 ◽  
Vol 25 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Amaia Del Campo ◽  
Marisalva Fávero
Keyword(s):  
United States ◽  
Sexual Abuse ◽  
New Zealand ◽  
Critical Analysis ◽  
Prevention Programs ◽  
The United States ◽  
Sexual Abuse Prevention ◽  
Negative Effects ◽  
The United Kingdom ◽  
Methodological Considerations

Abstract. During the last decades, several studies have been conducted on the effectiveness of sexual abuse prevention programs implemented in different countries. In this article, we present a review of 70 studies (1981–2017) evaluating prevention programs, conducted mostly in the United States and Canada, although with a considerable presence also in other countries, such as New Zealand and the United Kingdom. The results of these studies, in general, are very promising and encourage us to continue this type of intervention, almost unanimously confirming its effectiveness. Prevention programs encourage children and adolescents to report the abuse experienced and they may help to reduce the trauma of sexual abuse if there are victims among the participants. We also found that some evaluations have not considered the possible negative effects of this type of programs in the event that they are applied inappropriately. Finally, we present some methodological considerations as critical analysis to this type of evaluations.

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