Ecological risk assessment of multiple hatchery programs in the upper Columbia watershed using Delphi and modeling approaches

Pearsons, Todd N.; Murdoch, Andrew R.; Mackey, Greg; Murdoch, Keely; Hillman, Tracy W.; Cooper, Matthew R.

doi:10.1007/s10641-011-9884-1

Cited by 13 publications

(15 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the implementation of Returning Land from Farming to Forest Policy increase the forest landscape connectivity and decrease the ecological risk of land use. These concludes show that land use change can affect ecological security and support the method of eco-risk assessment of land use in this study is feasible, which also can be seen by other findings [5,7,15]. …”

Section: Discussionsupporting

confidence: 88%

“…Ecological impacts caused by the intensification of land use have regional and cumulative characteristics and can be directly reflected in the ecosystem structure and composition. With the in-depth study of the ecological environment, ecological risk assessment has become an essential tool for the management of the ecological environment [5]. The main purpose of ecological risk assessment is to evaluate the negative impact on the likelihood and degree of harm.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ecological Risk Assessment of Land Use Change in the Poyang Lake Eco-economic Zone, China

Xie

Wang

Hong-sheng

2013

IJERPH

145

View full text Add to dashboard Cite

Land use/land cover change has been attracting increasing attention in the field of global environmental change research because of its role in the social and ecological environment. To explore the ecological risk characteristics of land use change in the Poyang Lake Eco-economic Zone of China, an eco-risk index was established in this study by the combination of a landscape disturbance index with a landscape fragmentation index. Spatial distribution and gradient difference of land use eco-risk are analyzed by using the methods of spatial autocorrelation and semivariance. Results show that ecological risk in the study area has a positive correlation, and there is a decreasing trend with the increase of grain size both in 1995 and 2005. Because the area of high eco-risk value increased from 1995 to 2005, eco-environment quality declined slightly in the study area. There are distinct spatial changes in the concentrated areas with high land use eco-risk values from 1995 to 2005. The step length of spatial separation of land use eco-risk is comparatively long—58 km in 1995 and 11 km in 2005—respectively. There are still nonstructural factors affecting the quality of the regional ecological environment at some small-scales. Our research results can provide some useful information for land eco-management, eco-environmental harnessing and restoration. In the future, some measures should be put forward in the regions with high eco-risk value, which include strengthening land use management, avoiding unreasonable types of land use and reducing the degree of fragmentation and separation.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Ecological Risk Assessment of Land Use Change in the Poyang Lake Eco-economic Zone, China

Xie

Wang

Hong-sheng

2013

IJERPH

145

View full text Add to dashboard Cite

show abstract

“…When the quality or quantity of data is too suspect to run the model, then an expert based approach, such as described by Pearsons and Hopley (1999), may be more desirable. Alternatively, both modeling and expert based approaches could be used and the results compared (Pearsons et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…The model has not been widely used because it is relatively new (but see current example in this issue by Pearsons et al 2011). Preliminary results from watersheds with information on hatchery and wild fish populations suggest that model results are not unreasonable, but the model needs to be tested in a variety of different watersheds where data is currently available.…”

Section: Discussionmentioning

confidence: 99%

PCD Risk 1: A tool for assessing and reducing ecological risks of hatchery operations in freshwater

Pearsons

Busack

2011

Environ Biol Fish

Self Cite

View full text Add to dashboard Cite

PCD RISK 1 is a flexible computer model designed to assist in assessment and reduction of ecological risks to natural origin fish from hatchery fish releases. PCD RISK 1 simulates predation, competition, and disease impacts on naturally produced salmonids caused by hatchery smolts in fresh water as they move downstream or residualize after release. Individual-based, the model relies upon user specified inputs of up to 45 variables, such as number and size of hatchery and wild fish, and water temperature. The model generates hatchery and natural fish of specified size distributions, then randomly pairs them for interactions for a specified number of days and encounters. Wild fish are subjected to predation if they are less than 50% the length of hatchery fish, otherwise they are subjected to competition. After all of the allowable competition and predation occurs, survivors are subjected to disease risk. The model can provide either deterministic or probabilistic output. Deterministic output includes the number and proportion of wild fish that die from predation, competition, disease, and from all interactions combined. Probabilistic output includes probability distributions of the number and proportion of mortalities, based on user-specified uncertainty input either as uniform or triangular distributions for any of several variables. If desired, the model can also quantify impacts for multiple age or size classes. Simulations of a variety of hatchery programs reveal that risks are highly diverse and that a variety of options are available to reduce risks.

show abstract

“…The study combining land-use change and landscape pattern will help to explore the relationship between land-use change and landscape ecological process and achieve the goal of sustainable land use [19]. Considering that the actual situations of land-use patterns in different regions of Jiangsu are different, respective LVI and LHAI values were calculated to evaluate the land-use change and its landscape ecological impact of 78 county-level areas (districts, counties, and county-level cities)(During the study period, the boundary of counties of Suzhou city was adjusted: In 2001, Wu county was abolished and divided into Wuzhong district and Xiangcheng district.…”

Section: Methodologiesmentioning

confidence: 99%

Coastal Landscape Vulnerability Analysis in Eastern China—Based on Land-Use Change in Jiangsu Province

Zhou

Liu

Zhu

2020

IJERPH

View full text Add to dashboard Cite

The unreasonable land use in rapid urbanization areas induced by large-scale urban construction activities have caused massive ecological issues. In this study, landscape vulnerability index (LVI) and landscape human interference index (LHAI) were originally addressed and calculated using multi-temporal land-use data from 2000 to 2015. Then, the spatial-temporal relationship assessment model of landscape fragility caused by human activities were constructed for each county of Jiangsu Province, China, so as to analyze the spatial distribution of landscape vulnerability and determine the impacts of artificial disturbance on landscape vulnerability. The results showed: (1) The number of counties with middle and high landscape vulnerability increased from 20 in 2000 to 27 in 2015 with a peak value (33) in 2010. (2) Counties with high-intensity human activities showed an upward trend. (3) Land use generally has a significant and diverse impact on landscape vulnerability. At the county level, the LVI was positively correlated with the LHAI before 2010 and was followed by a negative correlation of them. As concluded from this study, a total of four sub-regions (continuous benefit zones, variable benefit zones, continuous harmful zones, and variable harmful zones) have been identified for sustainable landscape management in the future. (4) The LVI suggests that the landscape vulnerability in Jiangsu did not continue to deteriorate in the study period. Further, accelerated land exploitation has produced a positive impact on regional economic development and ecological protection. This study provided an effective method set for analyzing the environmental impacts caused by human activities and promoting future ecosystem management in coastal areas.

show abstract

Ecological risk assessment of multiple hatchery programs in the upper Columbia watershed using Delphi and modeling approaches

Cited by 13 publications

References 8 publications

Ecological Risk Assessment of Land Use Change in the Poyang Lake Eco-economic Zone, China

Ecological Risk Assessment of Land Use Change in the Poyang Lake Eco-economic Zone, China

PCD Risk 1: A tool for assessing and reducing ecological risks of hatchery operations in freshwater

Coastal Landscape Vulnerability Analysis in Eastern China—Based on Land-Use Change in Jiangsu Province

Contact Info

Product

Resources

About