Tree recruitment and survival in rivers: influence of hydrological processes

Simulated recruitment of riparian trees and shrubs under natural and regulated flow regimes on the Wisconsin River, USA

“…Seedling establishment of S. exigua, which had the longest dispersal duration of any species, was more strongly related to flows later in the summer (August and September). The importance of summer high flows for limiting establishment matches well with our field observations on the Wisconsin Dixon, 2003) and (Johnson, 1994(Johnson, , 1997(Johnson, , 2000. Our model results suggest that flow regulation may have heightened the importance of summer flow events for enhancing or limiting seedling recruitment on the Wisconsin, as the dams reduce spring peak flow magnitude and increase the probability that firstyear seedlings will survive until the following spring.…”

Simulated recruitment of riparian trees and shrubs under natural and regulated flow regimes on the Wisconsin River, USA

“…Seedling establishment of S. exigua, which had the longest dispersal duration of any species, was more strongly related to flows later in the summer (August and September). The importance of summer high flows for limiting establishment matches well with our field observations on the Wisconsin Dixon, 2003) and (Johnson, 1994(Johnson, , 1997(Johnson, , 2000. Our model results suggest that flow regulation may have heightened the importance of summer flow events for enhancing or limiting seedling recruitment on the Wisconsin, as the dams reduce spring peak flow magnitude and increase the probability that firstyear seedlings will survive until the following spring.…”

Associations of extreme weather, El Niño events, and streamflow with the annual apparent survival of a migratory riparian bird in the western United States

“…4d). Riparian ecosystem health is driven by multiple factors, including spring precipitation (Warter et al 2023) and streamflow rate (Elias et al 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al 2021. Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020).…”

“…Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020). Such changes could reduce native tree abundance while promoting invasive species (Johnson 2000), further stressing riparian habitats and decreasing resource availability for chats and similar species. Although streamflow has not been directly related to survival in previous studies, decreased flow rates have been associated with declines in obligate riparian species abundance (Merritt & Bateman 2012, Hinojosa-Huerta et al 2013, Cubley et al 2020.…”

“…2023) and streamflow rate (Elias et al . 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al . 2021).…”

Modelling flow regulation effects on vegetation recruitment and survival on alternate bars in channelized rivers

“…The degree to which artificial flow releases have the ability to act as ‘eco‐geomorphic flows’ and restore the previous system state by curtailing vegetation encroachment, either in summer (after seed dispersal) or at a later stage, and possibly in combination with vegetation management and morphological restoration of the bars, is still an unresolved issue (Claude et al, 2018). Few studies have proposed flow manipulation as an approach to river management and restoration (Gladwin & Roelle, 1998; Johnson, 2000; Robinson et al, 2004). The responses of seedling survival to such events are not always evident, are rarely recorded accurately and, as noted by Miao et al (2009), a sequence of flow events may be necessary to induce strong effects.…”

Simulated recruitment of riparian trees and shrubs under natural and regulated flow regimes on the Wisconsin River, USA

“…Seedling establishment of S. exigua, which had the longest dispersal duration of any species, was more strongly related to flows later in the summer (August and September). The importance of summer high flows for limiting establishment matches well with our field observations on the Wisconsin Dixon, 2003) and (Johnson, 1994(Johnson, , 1997(Johnson, , 2000. Our model results suggest that flow regulation may have heightened the importance of summer flow events for enhancing or limiting seedling recruitment on the Wisconsin, as the dams reduce spring peak flow magnitude and increase the probability that firstyear seedlings will survive until the following spring.…”

Associations of extreme weather, El Niño events, and streamflow with the annual apparent survival of a migratory riparian bird in the western United States

“…4d). Riparian ecosystem health is driven by multiple factors, including spring precipitation (Warter et al 2023) and streamflow rate (Elias et al 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al 2021. Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020).…”

“…Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020). Such changes could reduce native tree abundance while promoting invasive species (Johnson 2000), further stressing riparian habitats and decreasing resource availability for chats and similar species. Although streamflow has not been directly related to survival in previous studies, decreased flow rates have been associated with declines in obligate riparian species abundance (Merritt & Bateman 2012, Hinojosa-Huerta et al 2013, Cubley et al 2020.…”

“…2023) and streamflow rate (Elias et al . 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al . 2021).…”

Modelling flow regulation effects on vegetation recruitment and survival on alternate bars in channelized rivers

“…The degree to which artificial flow releases have the ability to act as ‘eco‐geomorphic flows’ and restore the previous system state by curtailing vegetation encroachment, either in summer (after seed dispersal) or at a later stage, and possibly in combination with vegetation management and morphological restoration of the bars, is still an unresolved issue (Claude et al, 2018). Few studies have proposed flow manipulation as an approach to river management and restoration (Gladwin & Roelle, 1998; Johnson, 2000; Robinson et al, 2004). The responses of seedling survival to such events are not always evident, are rarely recorded accurately and, as noted by Miao et al (2009), a sequence of flow events may be necessary to induce strong effects.…”

Simulated recruitment of riparian trees and shrubs under natural and regulated flow regimes on the Wisconsin River, USA

“…Seedling establishment of S. exigua, which had the longest dispersal duration of any species, was more strongly related to flows later in the summer (August and September). The importance of summer high flows for limiting establishment matches well with our field observations on the Wisconsin Dixon, 2003) and (Johnson, 1994(Johnson, , 1997(Johnson, , 2000. Our model results suggest that flow regulation may have heightened the importance of summer flow events for enhancing or limiting seedling recruitment on the Wisconsin, as the dams reduce spring peak flow magnitude and increase the probability that firstyear seedlings will survive until the following spring.…”

Associations of extreme weather, El Niño events, and streamflow with the annual apparent survival of a migratory riparian bird in the western United States

“…4d). Riparian ecosystem health is driven by multiple factors, including spring precipitation (Warter et al 2023) and streamflow rate (Elias et al 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al 2021. Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020).…”

“…Climate warming is predicted to disrupt these dynamics, potentially causing mismatches between riparian seed dispersal and snowmelt (Perry et al 2020). Such changes could reduce native tree abundance while promoting invasive species (Johnson 2000), further stressing riparian habitats and decreasing resource availability for chats and similar species. Although streamflow has not been directly related to survival in previous studies, decreased flow rates have been associated with declines in obligate riparian species abundance (Merritt & Bateman 2012, Hinojosa-Huerta et al 2013, Cubley et al 2020.…”

“…2023) and streamflow rate (Elias et al . 2021), the latter being highly sensitive to the timing and magnitude of upstream snowmelt (Johnson 2000, Elias et al . 2021).…”

Modelling flow regulation effects on vegetation recruitment and survival on alternate bars in channelized rivers

“…The degree to which artificial flow releases have the ability to act as ‘eco‐geomorphic flows’ and restore the previous system state by curtailing vegetation encroachment, either in summer (after seed dispersal) or at a later stage, and possibly in combination with vegetation management and morphological restoration of the bars, is still an unresolved issue (Claude et al, 2018). Few studies have proposed flow manipulation as an approach to river management and restoration (Gladwin & Roelle, 1998; Johnson, 2000; Robinson et al, 2004). The responses of seedling survival to such events are not always evident, are rarely recorded accurately and, as noted by Miao et al (2009), a sequence of flow events may be necessary to induce strong effects.…”