Rapid dispersal of saltcedar (Tamarix spp.) biocontrol beetles (Diorhabda carinulata) on a desert river detected by phenocams, MODIS imagery and ground observations

Nagler, Pamela L.; Pearlstein, S.; Glenn, Edward P.; Brown, Thomas S.; Bateman, Heather L.; Bean, Daniel W.; Hultine, Kevin R.

doi:10.1016/j.rse.2013.08.017

Cited by 56 publications

(54 citation statements)

References 46 publications

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“…Our ET estimates for the five other sites were in rough agreement with previously published rates (Figure , Table ). Previous studies corroborate the use of NDVI for tamarisk stand vigour and water use (Bedford, Sankey, Sankey, Durning, & Ralston, ; Dennison et al, ; Everitt, Yang, Fletcher, Deloach, & Davis, ; Hultine et al, ; Meng et al, ; Nagler et al, ; Nagler et al, ; Sueki et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…This agrees with previous research findings indicating little possibility of sustained “water salvage” with tamarisk reduction in these environments where potential ET exceeds PPT and groundwater is bioavailable (Hultine, Belnap, et al, ; Hultine & Bush, ; Hultine, Nagler, et al, ; Nagler et al, ; Nagler et al, ; Owens & Moore, ). It also supports the general pattern found in many studies (Ji et al, ; Nagler et al, ; Nagler et al, ; Sueki et al, ) that the first 1 to 3 years of defoliation are most extreme, then beetles generally decline in density as they move on to search for greener tamarisk patches (Ji et al, ). For example, Nagler et al () used a combination of remotely sensed Landsat and MODIS greenness imagery over a 10‐year period to estimate ET for six sites in the Western United States: Lower Dolores River, Middle–Upper Dolores River, Humboldt River, Walker River, Upper Colorado River, and Bighorn River.…”

Section: Discussionmentioning

confidence: 99%

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Longer term effects of biological control on tamarisk evapotranspiration and carbon dioxide exchange

Snyder¹,

Scott

2019

Hydrological Processes

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Biological control of Tamarix spp. (tamarisk) with Diorhabda spp. (tamarisk beetle) was initiated in several states in the Western United States in 2001. We analysed 12 years of evapotranspiration (ET), net ecosystem production (NEP), and beetle abundance data from a tamarisk-invaded site in Western Nevada along the Truckee River. Diorhabda carinulata (northern tamarisk beetle) appeared at the site in 2007. Large beetle outbreaks and associated defoliation of the tamarisk occurred in 2008 and 2009, then the beetle population was highly variable from year to year. Since 2016, the beetle population declined. Growing season ET noticeably declined from direct beetle herbivory in 2008, 2009, and 2010, but the decline in ET was seasonally transient as trees regrew leaves. In 2012 and 2013, total growing season ET was low, likely due to the combined effects of drought and beetle herbivory pressure. Total seasonal ET losses and NEP were primarily driven by annual precipitation with higher values in wetter years and reduced values when precipitation fell below 100 mm. In the last 2 years of the study, 2017-2018, there were few to no beetles observed at the site, and we measured increased tamarisk leaf area index, ET, and NEP. Since 2010 at the study site, no further releases of the beetles have occurred due to wildlife concerns, and subsequent declines in beetle populations where such that the "outbreak" conditions apparently required to impair tamarisk physiological function and significantly reduce ET have not occurred. ET and photosynthesis were highly correlated (r 2 ≥ .91) to the Landsat-satellite normalized difference vegetation index (NDVI). Using a relationship between growing season ET and NDVI, we estimated ET for five additional tamarisk sites along several southwestern U.S. rivers. In the 2005 to 2018 analysis period, NDVI-estimated ET declined at all sites after beetle arrival with three sites showing a recovery in pre-beetle ET rates in subsequent years. At the other three sites, ET rates have not recovered to pre-beetle levels.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Longer term effects of biological control on tamarisk evapotranspiration and carbon dioxide exchange

Snyder¹,

Scott

2019

Hydrological Processes

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“…The impact of riparian ET on a particular river system depends on flow rates and the extent of the floodplain phreatophyte communities. On the Virgin River, a tributary to the Colorado River, flows are usually in the range of 400–800 ML d −1 , and the exotic shrub, Tamarix ramosissima and associated species and hybrids, has ET rates of about 750 mm yr −1 , similar to red gum in the present study, and consumes about 20% of annual river flows in ET (Nagler et al ., ). On the other hand , T. ramosissima ET rates for stands on the Lower Colorado River tend to be higher, about 1000 mm yr −1 , but because river flows are 85 000 ML d −1 , only about 1% of the water is discharged in ET in its 500 km passage from Lake Mead to the U.S.–Mexico border (Nagler et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Wide‐area estimates of evapotranspiration by red gum (Eucalyptus camaldulensis) and associated vegetation in the Murray–Darling River Basin, Australia

Nagler

Doody

Glenn

et al. 2015

Hydrological Processes

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Abstract:Floodplain red gum forests (Eucalyptus camaldulensis plus associated grasses, reeds and sedges) are sites of high biodiversity in otherwise arid regions of southeastern Australia. They depend on periodic floods from rivers, but dams and diversions have reduced flood frequencies and volumes, leading to deterioration of trees and associated biota. There is a need to determine their water requirements so environmental flows can be administered to maintain or restore the forests. Their water requirements include the frequency and extent of overbank flooding, which recharges the floodplain soils with water, as well as the actual amount of water consumed in evapotranspiration (ET). We estimated the flooding requirements and ET for a 38 134 ha area of red gum forest fed by the Murrumbidgee River in Yanga National Park, New South Wales. ET was estimated by three methods: sap flux sensors placed in individual trees; a remote sensing method based on the Enhanced Vegetation Index from MODIS satellite imagery and a water balance method based on differences between river flows into and out of the forest. The methods gave comparable estimates yet covered different spatial and temporal scales. We estimated flood frequency and volume requirements by comparing Normalized Difference Vegetation Index values from Landsat images with flood history from 1995 to 2014, which included both wet periods and dry periods. ET during wet years is about 50% of potential ET but is much less in dry years because of the trees' ability to control stomatal conductance. Based on our analyses plus other studies, red gum trees at this location require environmental flows of 2000 GL yr À1 every other year, with peak flows of 20 000 ML d À1, to produce flooding sufficient to keep them in good condition. However, only about 120-200 GL yr À1 of river water is consumed in ET, with the remainder flowing out of the forest where it enters the Murray River system.

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“…NDVIo had a range of 0.06 to 0.10, and NDVIs varied between 0.83 and 1.0 (Table 2) [42]. Pre-and post-beetle studies in the western U.S. have reported a 50% reduction in daily midsummer ET [60] and a 16% (204 mm•year −1 ) reduction on an annual basis [25]. A graphical representation of inter-annual variations of SSS-ET during the study years and the impact of the 2006 wildfire on tamarisk ET over the CNWR is shown in Figure 8.…”

Section: Inter-annual Variation Of Water Usementioning

confidence: 99%

Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach

2017

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Abstract:The accurate estimation of water use by groundwater-dependent riparian vegetation is of great importance to sustainable water resource management in arid/semi-arid regions. Remote sensing methods can be effective in this regard, as they capture the inherent spatial variability in riparian ecosystems. The single-satellite-scene (SSS) method uses a derivation of the Normalized Difference Vegetation Index (NDVI) from a single space-borne image during the peak growing season and minimal ground-based meteorological data to estimate the annual riparian water use on a distributed basis. This method was applied to a riparian ecosystem dominated by tamarisk along a section of the lower Colorado River in southern California. The results were compared against the estimates of a previously validated remotely sensed energy balance model for the year 2008 at two different spatial scales. A pixel-wide comparison showed good correlation (R 2 = 0.86), with a mean residual error of less than 104 mm·year −1 (18%). This error reduced to less than 95 mm·year −1 (15%) when larger areas were used in comparisons. In addition, the accuracy improved significantly when areas with no and low vegetation cover were excluded from the analysis. The SSS method was then applied to estimate the riparian water use for a 23-year period . The average annual water use over this period was 748 mm·year −1 for the entire study area, with large spatial variability depending on vegetation density. Comparisons with two independent water use estimates showed significant differences. The MODIS evapotranspiration product (MOD16) was 82% smaller, and the crop-coefficient approach employed by the US Bureau of Reclamation was 96% larger, than that from the SSS method on average.

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Rapid dispersal of saltcedar (Tamarix spp.) biocontrol beetles (Diorhabda carinulata) on a desert river detected by phenocams, MODIS imagery and ground observations

Cited by 56 publications

References 46 publications

Longer term effects of biological control on tamarisk evapotranspiration and carbon dioxide exchange

Longer term effects of biological control on tamarisk evapotranspiration and carbon dioxide exchange

Wide‐area estimates of evapotranspiration by red gum (Eucalyptus camaldulensis) and associated vegetation in the Murray–Darling River Basin, Australia

Mapping Annual Riparian Water Use Based on the Single-Satellite-Scene Approach

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