The Experts below are selected from a list of 34686 Experts worldwide ranked by ideXlab platform
Daniel J Rogers - One of the best experts on this subject based on the ideXlab platform.
-
predicting the distribution of a suitable Habitat for the white stork in southern sweden identifying priority areas for reintroduction and Habitat Restoration
Animal Conservation, 2009Co-Authors: Ola Olsson, Daniel J RogersAbstract:The loss of wetlands and semi-natural grasslands throughout much of Europe has led to a historic decline of species associated with these Habitats. The reinstatement of these Habitats, however, requires spatially explicit predictions of the most suitable sites for Restoration, to maximize the ecological benefit per unit effort. One species that demonstrates such declines is the white stork Ciconia ciconia, and the Restoration of Habitat for this flagship species is likely to benefit a suite of other wetland and grassland biota. Storks are also being reintroduced into southern Sweden and elsewhere, and the a priori identification of suitable sites for reintroduction will greatly improve the success of such programmes. Here a simple predictive Habitat-use model was developed, where only a small but reliable presence-only dataset was available. The model is based on the extent and relative soil moisture of semi-natural pastures, the extent of wetlands and the extent of hayfields in southern Sweden. Here the model was used to predict the current extent of stork Habitat that is suitable for successful breeding, and the extent of Habitat that would become suitable with moderate Habitat Restoration. The Habitat model identifies all 10 occupied nesting sites where breeding is currently successful. It also identifies similar to 300 km(2) of Habitat that is predicted to be suitable stork Habitat, but that is presently unused; these sites were identified as potential areas for stork reintroduction. The model also identifies over 100 areas where moderate Habitat Restoration is predicted to have a disproportionate effect (relative to the Restoration effort) on the area of suitable Habitat for storks; these sites were identified as priorities for Habitat Restoration. By identifying areas for reintroduction and Restoration, such Habitat suitability models have the potential to maximize the effectiveness of such conservation programmes.
-
predicting the distribution of a suitable Habitat for the white stork in southern sweden identifying priority areas for reintroduction and Habitat Restoration
Animal Conservation, 2009Co-Authors: Ola Olsson, Daniel J RogersAbstract:The loss of wetlands and semi-natural grasslands throughout much of Europe has led to a historic decline of species associated with these Habitats. The reinstatement of these Habitats, however, requires spatially explicit predictions of the most suitable sites for Restoration, to maximize the ecological benefit per unit effort. One species that demonstrates such declines is the white stork Ciconia ciconia, and the Restoration of Habitat for this flagship species is likely to benefit a suite of other wetland and grassland biota. Storks are also being reintroduced into southern Sweden and elsewhere, and the a priori identification of suitable sites for reintroduction will greatly improve the success of such programmes. Here a simple predictive Habitat-use model was developed, where only a small but reliable presence-only dataset was available. The model is based on the extent and relative soil moisture of semi-natural pastures, the extent of wetlands and the extent of hayfields in southern Sweden. Here the model was used to predict the current extent of stork Habitat that is suitable for successful breeding, and the extent of Habitat that would become suitable with moderate Habitat Restoration. The Habitat model identifies all 10 occupied nesting sites where breeding is currently successful. It also identifies similar to 300 km(2) of Habitat that is predicted to be suitable stork Habitat, but that is presently unused; these sites were identified as potential areas for stork reintroduction. The model also identifies over 100 areas where moderate Habitat Restoration is predicted to have a disproportionate effect (relative to the Restoration effort) on the area of suitable Habitat for storks; these sites were identified as priorities for Habitat Restoration. By identifying areas for reintroduction and Restoration, such Habitat suitability models have the potential to maximize the effectiveness of such conservation programmes.
Ola Olsson - One of the best experts on this subject based on the ideXlab platform.
-
predicting the distribution of a suitable Habitat for the white stork in southern sweden identifying priority areas for reintroduction and Habitat Restoration
Animal Conservation, 2009Co-Authors: Ola Olsson, Daniel J RogersAbstract:The loss of wetlands and semi-natural grasslands throughout much of Europe has led to a historic decline of species associated with these Habitats. The reinstatement of these Habitats, however, requires spatially explicit predictions of the most suitable sites for Restoration, to maximize the ecological benefit per unit effort. One species that demonstrates such declines is the white stork Ciconia ciconia, and the Restoration of Habitat for this flagship species is likely to benefit a suite of other wetland and grassland biota. Storks are also being reintroduced into southern Sweden and elsewhere, and the a priori identification of suitable sites for reintroduction will greatly improve the success of such programmes. Here a simple predictive Habitat-use model was developed, where only a small but reliable presence-only dataset was available. The model is based on the extent and relative soil moisture of semi-natural pastures, the extent of wetlands and the extent of hayfields in southern Sweden. Here the model was used to predict the current extent of stork Habitat that is suitable for successful breeding, and the extent of Habitat that would become suitable with moderate Habitat Restoration. The Habitat model identifies all 10 occupied nesting sites where breeding is currently successful. It also identifies similar to 300 km(2) of Habitat that is predicted to be suitable stork Habitat, but that is presently unused; these sites were identified as potential areas for stork reintroduction. The model also identifies over 100 areas where moderate Habitat Restoration is predicted to have a disproportionate effect (relative to the Restoration effort) on the area of suitable Habitat for storks; these sites were identified as priorities for Habitat Restoration. By identifying areas for reintroduction and Restoration, such Habitat suitability models have the potential to maximize the effectiveness of such conservation programmes.
-
predicting the distribution of a suitable Habitat for the white stork in southern sweden identifying priority areas for reintroduction and Habitat Restoration
Animal Conservation, 2009Co-Authors: Ola Olsson, Daniel J RogersAbstract:The loss of wetlands and semi-natural grasslands throughout much of Europe has led to a historic decline of species associated with these Habitats. The reinstatement of these Habitats, however, requires spatially explicit predictions of the most suitable sites for Restoration, to maximize the ecological benefit per unit effort. One species that demonstrates such declines is the white stork Ciconia ciconia, and the Restoration of Habitat for this flagship species is likely to benefit a suite of other wetland and grassland biota. Storks are also being reintroduced into southern Sweden and elsewhere, and the a priori identification of suitable sites for reintroduction will greatly improve the success of such programmes. Here a simple predictive Habitat-use model was developed, where only a small but reliable presence-only dataset was available. The model is based on the extent and relative soil moisture of semi-natural pastures, the extent of wetlands and the extent of hayfields in southern Sweden. Here the model was used to predict the current extent of stork Habitat that is suitable for successful breeding, and the extent of Habitat that would become suitable with moderate Habitat Restoration. The Habitat model identifies all 10 occupied nesting sites where breeding is currently successful. It also identifies similar to 300 km(2) of Habitat that is predicted to be suitable stork Habitat, but that is presently unused; these sites were identified as potential areas for stork reintroduction. The model also identifies over 100 areas where moderate Habitat Restoration is predicted to have a disproportionate effect (relative to the Restoration effort) on the area of suitable Habitat for storks; these sites were identified as priorities for Habitat Restoration. By identifying areas for reintroduction and Restoration, such Habitat suitability models have the potential to maximize the effectiveness of such conservation programmes.
Timo Muotka - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis of Habitat Restoration impacts on young-of-the-year salmonids in boreal rivers
Reviews in Fish Biology and Fisheries, 2019Co-Authors: Maare Marttila, Pauliina Louhi, Ari Huusko, Teppo Vehanen, Aki Mäki-petäys, Jaakko Erkinaro, Jukka Tapani Syrjänen, Timo MuotkaAbstract:River Restoration offers the potential to enhance biological integrity, often measured as fish population changes. We used a meta-analytical approach to synthesize density responses to in-stream Habitat Restoration by young-of-the year (YOY) brown trout and Atlantic salmon in 28 rivers (overall 32 Restoration projects) in Finland. We also examined which local and watershed-scale factors most influenced Restoration success. Finally, we conducted an expert survey to obtain an independent estimate of a sufficient density enhancement for Restoration to be considered successful. Despite strong context-dependency, Habitat Restoration had an overall positive effect on YOY salmonid density. When compared to target levels derived from the expert survey, density responses mainly reached the minimum expected success rate, but remained short of the level considered to reflect distinct success. Variability in Restoration responses of trout was linked mainly to river size, predominant geology, water quality and potential interspecific competition (trout vs. European bullhead). Fishing mortality tended to obscure positive effects of Restoration and stocking by YOY fish affected negatively trout’s response to Restoration, supporting a shift towards self-sustainable schemes in fisheries management. These results imply that Habitat Restoration is a useful approach for improving the ecological and conservational status of salmonid populations in boreal rivers. To further improve the success rate, and thereby public acceptance, of Restorations they need to be complemented by other management measures that enhance the potential for the recovery of threatened salmonid populations.
-
Long-term monitoring reveals the success of salmonid Habitat Restoration
Canadian Journal of Fisheries and Aquatic Sciences, 2016Co-Authors: Pauliina Louhi, Ari Huusko, Teppo Vehanen, Aki Mäki-petäys, Timo MuotkaAbstract:The growing concern on declining salmonid populations has resulted in numerous Restoration projects with variable responses worldwide. In this spatially replicated multiyear study, we assessed the long-term (12 years postRestoration) effects of in-stream Habitat Restoration (i.e., addition of boulders or large woody debris (LWD) together with boulders) on densities of three age-classes of juvenile brown trout (Salmo trutta) in six forest streams in northern Finland. LWD combined with boulders was more beneficial, particularly for the larger trout (age-2 and older), than were boulder structures alone, indicating that the more diverse Habitat created by LWD may have provided a safeguard against drought for the larger fish. Density of age-0+ trout showed a significant long-term increase in boulder-restored sections, providing evidence that log structures may need to be complemented by stony enhancement structures to guarantee the availability of suitable stream Habitat for all trout age-classes. As trout den...
Robert E. Bilby - One of the best experts on this subject based on the ideXlab platform.
-
The influence of scale on salmon Habitat Restoration priorities
Animal Conservation, 2003Co-Authors: Blake E. Feist, E. Ashley Steel, George R. Pess, Robert E. BilbyAbstract:Abstract Habitat loss and alteration is the leading cause of species’ declines world-wide, therefore Habitat Restoration and protection is a prominent conservation strategy. Despite obvious connections between Habitat and threatened or endangered species, conservationists have been hard pressed explicitly to link abundance or population health with Habitat attributes. Given that Habitat relationships with species are often characterized at a spatial scale that does not account for the functional relationships between Habitat and populations, it is not surprising that the Habitat–population conundrum persists. In order to explore the influence of spatial scale on the apparent relationship between Habitat and populations, we examined the relationship between GIS-based Habitat data and spring/summer chinook salmon ( Oncorhynchus tshawytscha ) redd (spawning nests built by females) densities in the Salmon River basin, Idaho, at two very different spatial scales: stream reach and watershed. Redd density was strongly correlated with climate, geology, wetlands and terrain. However, our stream-reach scale models provided poor predictive power compared with the watershed scale models. Based on these results, we conclude that our perception of which Habitat attributes were important was clearly a function of our scale of observation, and that Restoration efforts should focus on conditions at the watershed or landscape scale when attempting to do local or reach scale Restoration projects.
Ari Huusko - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis of Habitat Restoration impacts on young-of-the-year salmonids in boreal rivers
Reviews in Fish Biology and Fisheries, 2019Co-Authors: Maare Marttila, Pauliina Louhi, Ari Huusko, Teppo Vehanen, Aki Mäki-petäys, Jaakko Erkinaro, Jukka Tapani Syrjänen, Timo MuotkaAbstract:River Restoration offers the potential to enhance biological integrity, often measured as fish population changes. We used a meta-analytical approach to synthesize density responses to in-stream Habitat Restoration by young-of-the year (YOY) brown trout and Atlantic salmon in 28 rivers (overall 32 Restoration projects) in Finland. We also examined which local and watershed-scale factors most influenced Restoration success. Finally, we conducted an expert survey to obtain an independent estimate of a sufficient density enhancement for Restoration to be considered successful. Despite strong context-dependency, Habitat Restoration had an overall positive effect on YOY salmonid density. When compared to target levels derived from the expert survey, density responses mainly reached the minimum expected success rate, but remained short of the level considered to reflect distinct success. Variability in Restoration responses of trout was linked mainly to river size, predominant geology, water quality and potential interspecific competition (trout vs. European bullhead). Fishing mortality tended to obscure positive effects of Restoration and stocking by YOY fish affected negatively trout’s response to Restoration, supporting a shift towards self-sustainable schemes in fisheries management. These results imply that Habitat Restoration is a useful approach for improving the ecological and conservational status of salmonid populations in boreal rivers. To further improve the success rate, and thereby public acceptance, of Restorations they need to be complemented by other management measures that enhance the potential for the recovery of threatened salmonid populations.
-
Long-term monitoring reveals the success of salmonid Habitat Restoration
Canadian Journal of Fisheries and Aquatic Sciences, 2016Co-Authors: Pauliina Louhi, Ari Huusko, Teppo Vehanen, Aki Mäki-petäys, Timo MuotkaAbstract:The growing concern on declining salmonid populations has resulted in numerous Restoration projects with variable responses worldwide. In this spatially replicated multiyear study, we assessed the long-term (12 years postRestoration) effects of in-stream Habitat Restoration (i.e., addition of boulders or large woody debris (LWD) together with boulders) on densities of three age-classes of juvenile brown trout (Salmo trutta) in six forest streams in northern Finland. LWD combined with boulders was more beneficial, particularly for the larger trout (age-2 and older), than were boulder structures alone, indicating that the more diverse Habitat created by LWD may have provided a safeguard against drought for the larger fish. Density of age-0+ trout showed a significant long-term increase in boulder-restored sections, providing evidence that log structures may need to be complemented by stony enhancement structures to guarantee the availability of suitable stream Habitat for all trout age-classes. As trout den...
-
The Potential Role of Stream Habitat Restoration in Facilitating Salmonid Invasions: A Habitat‐Hydraulic Modeling Approach
Restoration Ecology, 2010Co-Authors: Kai Korsu, Ari Huusko, Pekka Korhonen, Timo YrjänäAbstract:Many successful invasions have taken place in systems where harmful disturbance has changed Habitat conditions. However, less attention has been paid to the role of Habitat Restoration, which modifies Habitats and thus also has the potential to facilitate invasions. We examined whether in-stream Habitat Restorations have the potential to either facilitate or resist invasion by two widely introduced non-native stream salmonids, Salvelinus fontinalis Mitchill and Oncorhynchus mykiss Walbaum, in Finland. A physical Habitat simulation system was used to calculate whether the Habitat area for the target species increased or decreased following the Restorations. For comparison, we also reported results for four native stream fish species. The simulations showed that the restored streams provided the highest amount of usable Habitat area for the native species, particularly for Salmo salar L. and Gottus gobio L. However, it was interesting to note that the Restorations significantly increased Habitat quality for the two non-native species, especially at low flows. Nevertheless, the non-native species had the lowest amount of usable Habitat area overall. The modeling results indicated that not only Habitat destruction but also Habitat Restoration could contribute to the spread of non-native species. Fisheries and wildlife managers should be aware of the possibility, when restoring Habitats in order to preserve native ecosystems, that non-native species could manage to gain a foothold in restored Habitats and use them as population sources for further spread. Knowing the widespread negative effect of non-native species, this risk should not be underestimated.