Wood density assessment to improve understanding of large wood buoyancy in rivers

Ruíz-Villanueva, Virginia; Stoffel, Markus; Piégay, Hervé; Gaertner, Vincent; Perret, Franck

doi:10.1201/b17133-333

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…However, the hypothesized < 1,000 km explanations for the natural arrival of X. darwini to the Galápagos, and X. clarionensis to the Revillagigedo Islands could be possible (Hurd 1958a). In ocean currents, some driftwood is capable of travelling great distances (e.g., Eggertsson 1993) provided it does not lose buoyancy, which typically can occur with 6 months to 1.5 years (Häggblom 1982), with logs of lesser volume (Eggertsson 1993) or greater density (Ruiz-Villanueva et al 2014) with decreased buoyancy. For many animals, total travel time is likely the main issue for successful natural dispersal in oceans over great distances (see de Queiroz 2014).…”

Section: Discussionmentioning

confidence: 99%

Xylocopa sonorina Smith, 1874 from Vancouver, British Columbia, Canada (Hymenoptera: Apidae, Xylocopinae) with comments on its taxonomy

Sheffield¹,

Heron

Musetti³

2020

BDJ

211

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Only one species of large carpenter bee, Xylocopa virginica (Linnaeus, 1771), has been recorded from Canada, albeit restricted to southern Ontario and Quebec. However, a single female specimen identified by Hurd in 1954 as X. varipuncta Patton, 1879 from British Columbia is in the C.A. Triplehorn Insect Collection at The Ohio State University (OSUC), suggesting that this species was accidentally introduced into coastal western Canada. As wood-nesters, many large carpenter bees are likely capable of expanding their range great distances by natural and unnatural transport methods while nesting inside suitable substrates, the presumed mode of transport into western Canada, and likely elsewhere. The ease at which the nests are transported has likely contributed to the nomenclatural and distributional ambiguity surrounding this species due to morphological similarities of specimens from North America, Hawaii, and several South Pacific islands. By comparing DNA barcodes of specimens from the western United States to specimens from Hawaii, we confirm the early opinion of P.H. Timberlake (Timberlake 1922) that specimens long established on the Hawaiian Islands are the same X. varipuncta from continental North America. Furthermore, these DNA barcode sequences also match those of specimens identified as X. sonorina Smith, 1874 from the French Polynesian and Samoan Islands, thus fully supporting the opinion of Groom et al. (2017) that all are likely conspecific. As X. sonorina, a species described from and likely introduced to Hawaii is the oldest name available, X. varipuncta is here placed into synonymy. Additional research will be needed to trace the timing and pathway of introduction and establishment of X. sonorina; it is presumed that the species is native to the southwestern United States but has been established in Hawaii since the mid-1800s. It is also established in French Polynesia, the Samoan Islands, and likely other south Pacific islands, with additional records of occurrence from Java, New Zealand, and now Canada.

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Section: Discussionmentioning

confidence: 99%

Xylocopa sonorina Smith, 1874 from Vancouver, British Columbia, Canada (Hymenoptera: Apidae, Xylocopinae) with comments on its taxonomy

Sheffield¹,

Heron

Musetti³

2020

BDJ

211

View full text Add to dashboard Cite

show abstract

“…Some pieces of wood can be transported over very long distances during a single flood (Gurnell et al, 2002;Gurnell, 2012;Comiti et al, 2016;. Moreover, the amount of wood can be documented at multi-annual and annual time intervals over long time periods by historical data (Seo et al, 2008;Seo and Nakamura, 2009;Ruiz-Villanueva et al, 2014b). Based on this long time scale, however, it is not possible to record continuous series and study wood transport processes during shorter but critical hydrological events such as floods, exceptional wind events, and landslides, which are known to drive wood fluxes in rivers (Lassettre and Kondolf, 2012;Ruiz Villanueva et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

Video monitoring of in‐channel wood: From flux characterization and prediction to recommendations to equip stations

Zhi

Ghaffarian

MacVicar

et al. 2021

Earth Surf Processes Landf

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Wood flux (piece number per time interval) is a key parameter for understanding wood budgeting, determining the controlling factors, and managing flood risk in a river basin. Quantitative wood flux data is critically needed to improve the understanding of wood dynamics and estimate wood discharge in rivers. In this study, the streamside videography technique was applied to detect wood passage and measure instantaneous rates of wood transport. The goal was to better understand how wood flux responds to flood and wind events and then predict wood flux. In total, one exceptional wind and 7 flood events were monitored on the Ain River, France, and around than 24000 wood pieces were detected visually. It is confirmed that, in general, there is a threshold of wood motion in the river equal to 60% of bankfull discharge. However, in a flood following a windy day, no obvious threshold for wood motion Video monitoring of in-channel wood 2 was observed, confirms that wind is important for the preparation of wood for transport between floods. In two multi-peaks floods, around two-thirds of the total amount of wood was delivered on the first peak, which confirms the importance of the time between floods for predicting wood fluxes. Moreover, we found an empirical relation between wood frequency and wood discharge, which is used to estimate the total wood amount produced by each of the floods. The data set is then used to develop a random forest regression model to predict wood frequency as a function of three input variables that are derived from the flow hydrograph. The model calculates the total wood volume either during day or night based on the video monitoring technique for the first time, which expands its utility for wood budgeting in a watershed. A one-to-one link is then established between the fraction of detected pieces of wood and the dimensionless parameter " × ", which provides a general guideline for the design of monitoring stations.

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Video‐monitoring of wood discharge: first inter‐basin comparison and recommendations to install video cameras

Ghaffarian

Piégay

López

et al. 2020

Earth Surf Processes Landf

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Wood in rivers plays a major role both ecologically and morphologically. In recent decades, due to human activities in the river channels and along the riparian zone, wood obstruction and jamming has exacerbated flooding hazards and infrastructure damage. Therefore, it is necessary to quantify the wood flux and discharge in rivers to improve wood hazard management. Among the various methods for monitoring the wood flux in a river, the streamside videography technique is effective given its high temporal and spatial resolution. Previous work monitored the wood discharge (m3/s) using this technique in the Ain River (France) during three floods (MacVicar and Piégay, 2012), and the same method is implemented on the Isère River (France) to obtain the statistics of wood discharge for two floods. Comparison between the two sites supports the generalization of both the monitoring technique and the link between wood discharge and flood characteristics. We first show that the maximum wood discharge is observed at bankfull discharge, and we confirm the three stage model proposed by MacVicar and Piégay (2012). Additionally, transverse distributions of the number of wood pieces and corresponding wood length appear to be similar for different flood magnitudes on each site. As a technical contribution, the use of the same technique on two sites allows for recommendations on key decisions related to the location and implementation of the equipment. Both statistical and technical contributions can be used by decision makers to implement this monitoring technique, acquire the wood transport parameters, and evaluate the potential wood hazards at local scale or along a river. © 2020 John Wiley & Sons, Ltd.

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Wood density assessment to improve understanding of large wood buoyancy in rivers

Cited by 4 publications

References 1 publication

Xylocopa sonorina Smith, 1874 from Vancouver, British Columbia, Canada (Hymenoptera: Apidae, Xylocopinae) with comments on its taxonomy

Xylocopa sonorina Smith, 1874 from Vancouver, British Columbia, Canada (Hymenoptera: Apidae, Xylocopinae) with comments on its taxonomy

Video monitoring of in‐channel wood: From flux characterization and prediction to recommendations to equip stations

Video‐monitoring of wood discharge: first inter‐basin comparison and recommendations to install video cameras

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