Interactions between alien species and restoration of large-river ecosystems.

Strayer, David L.; Blair, Elizabeth A.; Caraco, Nina F.; Cole, Jonathan J.; Findlay, Stuart; Nieder, William C.; Pace, Michael L.

doi:10.1127/lr/15/2003/133

Cited by 7 publications

(14 citation statements)

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“…Moreover, if we examine Figs. 3E, F and 4 with the management goal of heightened Delta productivity in mind, we see how the non-native C. fluminea has constrained management options (Strayer et al 2005): whereas in the absence of bivalves shallow, slow habitats would represent a reasonable restoration target, no obvious productivity-enhancing options appear if bivalve grazing has the potential to be strong. In fact, those shallow, slow habitats could represent worse options than deep, fast habitats if bivalve grazing is rapid.…”

Section: Implications and Conclusionmentioning

confidence: 99%

“…Although prediction of non-native species responses to ecosystem management is difficult, it is known that ecosystem disturbances such as habitat restoration can facilitate the spread or introduction of non-natives (Strayer et al 2005). In addition, the widespread bivalve species considered herein (C. fluminea) is known to accumulate in the vicinity of high food concentrations (Vaughn and Hakenkamp 2001).…”

Section: Implications and Conclusionmentioning

confidence: 99%

“…Finally, non-natives are generally considered permanent, yet unpredictable. While non-native invasions are frequently irreversible at the ecosystem scale (Mills et al 2003, Lodge et al 2006, our ability to forecast the response of those species to restoration at the habitat scale can be severely limited, thus making future states of invaded ecosystems difficult to predict (Strayer et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Changing restoration rules: Exotic bivalves interact with residence time and depth to control phytoplankton productivity

Lucas

Thompson

2012

Ecosphere

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Citation: Lucas, L. V., and J. K. Thompson. 2012. Changing restoration rules: Exotic bivalves interact with residence time and depth to control phytoplankton productivity. Ecosphere 3(12):117. http://dx.doi.org/10.1890/ES12-00251.1Abstract. Non-native species are a prevalent ecosystem stressor that can interact with other stressors to confound resource management and restoration. We examine how interactions between physical habitat attributes and a particular category of non-native species (invasive bivalves) influence primary production in aquatic ecosystems. Using mathematical models, we show how intuitive relationships between phytoplankton productivity and controllable physical factors (water depth, hydraulic transport time) that hold in the absence of bivalves can be complicated-and even reversed-by rapid bivalve grazing. In lightlimited environments without bivalves, shallow, hydrodynamically ''slow'' habitats should generally have greater phytoplankton biomass and productivity than deeper, ''faster'' habitats. But shallower, slower environments can be less productive than deeper, faster ones if benthic grazing is strong. Moreover, shallower and slower waters exhibit a particularly broad range of possible productivity outcomes that can depend on whether bivalves are present. Since it is difficult to predict the response of non-native bivalves to habitat restoration, outcomes for new shallow, slow environments can be highly uncertain. Habitat depth and transport time should therefore not be used as indicators of phytoplankton biomass and production where bivalve colonization is possible. This study provides for ecosystem management a particular example of a broad lesson: abiotic ecosystem stressors should be managed with explicit consideration of interactions with other major (including biotic) stressors. We discuss the applicability and management implications of our models and results for a range of aquatic system types, with a case study focused on the Sacramento-San Joaquin Delta (California, USA). Simple mathematical models like those used here can illuminate interactions between ecosystem stressors and provide process-based guidance for resource managers as they develop strategies to augment valued populations, restore habitats, and manipulate ecosystem functions.

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Section: Implications and Conclusionmentioning

confidence: 99%

Section: Implications and Conclusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changing restoration rules: Exotic bivalves interact with residence time and depth to control phytoplankton productivity

Lucas

Thompson

2012

Ecosphere

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“…Xenodiversity (sensu Leppäkoski et al 2002b) may be extraordinarily high in, for example, large rivers of developed countries (e.g. the Hudson; Strayer et al 2005) and largely affects many taxa (e.g. fish; Lehtonen 2002).…”

Section: Introductionmentioning

confidence: 99%

Animal xenodiversity in Italian inland waters: distribution, modes of arrival, and pathways

et al. 2007

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The paper provides a list of the non-indigenous animal species occurring today in Italian inland waters. Xenodiversity was found to amount to 112 species (64 invertebrates and 48 vertebrates), which contribute for about 2% to the inland-water fauna in Italy. Northern and central regions are most affected, and Asia, North America, and the rest of Europe are the main donor continents. The large majority of non-indigenous species entered Italy as a direct or indirect effect of human intervention. A difference between invertebrates and vertebrates was found for their mode of arrival (unintentional for invertebrates and intentional for vertebrates). Accidental transport, in association with both fish (for aquaculture or stock enhancement) and crops, has been the main vector of invertebrate introductions, whereas vertebrates were mostly released for stocking purposes. Overall stock enhancement (47.92%) and culture (37.5%) prevailed over the other pathways. Seventeen and 7 species of our list are included among the 100 worst invasive species of Europe (DAISIE) and of the world (IUCN), respectively. For some (but not all) non-indigenous species recorded in Italy the multilevel impact exerted on the recipient communities and ecosystems is known, even if rarely quantified, but knowledge on their chronic impact is still missing. Additional research is needed to provide criteria for prioritizing intervention against well established invaders and identify which new potential invader should be targeted as "unwanted"

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“…Typically, these alien species have biological attributes favouring dispersal, establishment and population growth (Statzner, Bonada & Dol edec, 2008b). Moreover, restoration could favour arrival, establishment and population growth of alien species (Strayer et al, 2005). Thus, the presence of alien species could make predictions of restoration outcomes more uncertain.…”

Section: Predictions Of Changes In Community Traits and Alien Speciesmentioning

confidence: 99%

The ecological restoration of large rivers needs science‐based, predictive tools meeting public expectations: an overview of the Rhône project

et al. 2015

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Summary Effective environmental management needs models that reliably predict quantitative ecological changes as a function of restoration effort (e.g. cost) and meet expectations of stakeholders. Principal threats to large rivers are linked to human‐caused modifications of discharge and morphology of channels and floodplains. However, comprehensive large‐scale tests of the reliability of models predicting ecological consequences of restoring these elements are still lacking. Following a governmental decision, water managers, local authorities and the ‘Compagnie Nationale du Rhône’ financed a scientific programme to develop, test and subsequently use predictive models to assess the restoration (particularly minimum flow increases and reconnections of floodplain channels with the main channel) of eight regulated reaches of the French Rhône River. This approach was fostered by (i) the existence of local initiatives aimed at the ecological improvement of the Rhône; (ii) a history of interactions based on trust among stakeholders; and (iii) knowledge provided by a large interdisciplinary research group that studied the Rhône for two decades before the programme started in 1998. This Special Issue synthesises the insights gained over recent decades of research during which four river reaches (total length 47 km) were restored since 1999. It contains 11 articles including this overview. One article relates physical habitats in the floodplain to river hydrology and morphology; five articles test predictive models linking changes in habitat conditions to changes in taxa abundance, community metrics and biological traits of macroinvertebrates and fish; and four articles address the effects of restoration in larger contexts (long‐term community trends, optimisation of sampling strategies, social processes and bioindication). We describe the Rhône restoration project, explain the conceptual framework used to predict the effects of restoration on river biota and describe the contents of the Special Issue, the main results and their implications. The Rhône restoration led to more lotic and diverse aquatic communities and renewed social links with the river. When reliable pre‐restoration data are available, simple habitat models can be used to predict quantitative ecological changes as a function of restoration effort. The project illustrates the need to describe changes in hydraulic conditions in studies of physical river restoration and shows the effort required for a powerful assessment of restoration effects.

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Interactions between alien species and restoration of large-river ecosystems.

Cited by 7 publications

References 0 publications

Changing restoration rules: Exotic bivalves interact with residence time and depth to control phytoplankton productivity

Changing restoration rules: Exotic bivalves interact with residence time and depth to control phytoplankton productivity

Animal xenodiversity in Italian inland waters: distribution, modes of arrival, and pathways

The ecological restoration of large rivers needs science‐based, predictive tools meeting public expectations: an overview of the Rhône project

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