3. Vectors for Spread of Invasive Freshwater Vascular Plants with a North American Analysis

Sytsma, Mark D.; Pennington, Toni G.; Canning-Clode, João

doi:10.1515/9783110438666-007

Cited by 2 publications

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“…Many anglers or other users can also carry native and exotic plant fragments or seeds on their footwear (Ware et al 2012) or on their boats. Higher depths motivate boating or sailing for fish or sport, which is a major vector of native and exotic species dispersal (Rothlisberger et al 2010;Sytsma and Pennington 2015) and can partly explain the positive influence of depth on the percentage of exotic species.…”

Section: Influence Of Environmental Factors On Aquatic Plant Communitiesmentioning

confidence: 99%

A new method for monitoring macrophyte communities in small shallow lakes and ponds

Labat

Thiébaut²,

Piscart³

2022

Biodivers Conserv

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Macrophytes are key to the functioning of small shallow lakes (SSLs) because they maintain a clear water state through numerous positive feedbacks. The composition of macrophyte communities changes under anthropogenic pressures; as a result, tools designed to easily and rapidly assess their structure and composition are increasingly requested. We tested three sampling methods (the S3m sampling method, a stratified method, and a mapped inventory) to monitor macrophytes in 26 SSLs. The effect of each method was evaluated on seven descriptors of macrophyte communities, including the median conservation value. The results were comparable for the three methods, but the stratified method failed to accurately monitor the median conservation value and the number of species present at a low frequency, including exotic and patrimonial species, hence serious consequences for management decisions. S3m was applied to 262 SSLs ranging from 1 m² to 43 ha in surface area. Generalised additive models were used to investigate the environmental factors correlated with four conservation value or ecosystem functioning descriptors. The S3m method showed that surface area, distance from the source, elevation, and bank verticality were determinants of macrophyte richness. Invasive crayfish impacted the macrophyte richness and the coverage of submerged macrophytes, whereas fish presence increased the macrophyte richness and the percentage of exotic macrophytes and reduced patrimonial interest. S3m was successfully applied to a wide diversity of SSLs in France. It proved to be rapid, reproducible, and representative for monitoring macrophytes in SSLs. Therefore, it should be applied for SSL management.

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Section: Influence Of Environmental Factors On Aquatic Plant Communitiesmentioning

confidence: 99%

A new method for monitoring macrophyte communities in small shallow lakes and ponds

Labat

Thiébaut²,

Piscart³

2022

Biodivers Conserv

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Flight plan for the future: floatplane pilots and researchers team up to predict invasive species dispersal in Alaska

et al. 2022

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Aircraft can transport aquatic invasive species (AIS) from urban sources to remote waterbodies, yet little is known about this long-distance pathway. In North America and especially Alaska, aircraft with landing gear for water called floatplanes are used for recreation access to remote, often road-less wilderness destinations. Human-mediated dispersal of AIS is particularly concerning for the conservation of pristine wildlands, yet resource managers are often challenged by limited monitoring and response capacity given the vast areas they manage. We collected pathway data through a survey with floatplane pilots and used a Bayesian hierarchical model to inform early detection in a data-limited situation. The study was motivated by Alaska’s first known AIS, Elodea spp. (Elodea) and its floatplane-related dispersal. For 682 identified floatplane destinations, a Bayesian hierarchical model predicts the chance of flights originating from AIS source locations in freshwater and estimates the expected number of flights from these sources. Model predictions show the potential for broad spread across remote regions currently not known to have Elodea and informed monitoring and early detection efforts. Our result underlines the small window of opportunity for Arctic conservation strategies targeting an AIS free Arctic. We recommend management that focuses on long-distance connectivity, keeping urban sources free of AIS. We discuss applicability of the approach for other data-limited situations supporting data-informed AIS management responses.

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3. Vectors for Spread of Invasive Freshwater Vascular Plants with a North American Analysis

Cited by 2 publications

References 0 publications

A new method for monitoring macrophyte communities in small shallow lakes and ponds

A new method for monitoring macrophyte communities in small shallow lakes and ponds

Flight plan for the future: floatplane pilots and researchers team up to predict invasive species dispersal in Alaska

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