Long-Term Surveys Show Invasive Overbite Clams (Potamocorbula amurensis) are Spatially Limited in Suisun Marsh, California

Baumsteiger, Jason; Schroeter, Robert E.; O’Rear, Teejay A.; Cook, Jonathan D.; Moyle, Peter B.

doi:10.15447/sfews.2017v15iss2art6

Cited by 11 publications

(13 citation statements)

References 31 publications

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“…Invasive clams have been more thoroughly studied than jellyfish in the upper estuary, and the patterns found in this analysis confirm and extend some of the earlier studies' findings (Parchaso and Thompson 2002;Winder et al 2011;Crauder et al 2016;Baumsteiger et al 2017). C. fluminea and P. amurensis occupy different salinity regimes: C. fluminea primarily inhabits freshwater but has some tolerance for increased salinity during the juvenile phase, while P. amurensis is oligohaline with tolerance for both fresher and more saline water (Crauder et al 2016).…”

Section: P Amurensis Responses To Droughtsupporting

confidence: 83%

Amazing Graze: Shifts in Jellyfish and Clam Distributions During Dry Years in the San Francisco Estuary

Hartman,

Twardochleb,

Burdi

et al. 2024

SFEWS

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Aquatic invasive species have drastically changed how the San Francisco Estuary functions. During the past 2 decades, the effects of invasive species in the estuary may have increased in response to frequent and severe drought conditions. The invasive overbite clam (Potamocorbula amurensis), and the Asian Clam (Corbicula fluminea) have well documented consequences on the estuarine food web, but their responses to drought are not well understood. Another invasive species, the jellyfish Maeotias marginata, can further affect the food web, but these effects have not been studied. We investigated the population responses of these invasive species to dry years and their potential effects on the pelagic food web using data from the Interagency Ecological Program’s monitoring surveys. We found M. marginata rapidly moves upstream with changing salinities during dry years, though it sees its highest abundance during high-outflow years in Suisun Bay and Suisun Marsh. Grazing rates of M. marginata in the estuary have not been quantified but are potentially high during localized blooms. The two invasive clams overlap in distribution, but have opposite population responses to drought conditions, with increases in P. amurensis densities and decreases in C. fluminea densities in dry years. With increasing P. amurensis densities, the clams’ combined annual filtration rates increase during drier years in the confluence and Suisun Marsh. Like M. marginata, P. amurensis also shifts upstream during droughts, but because adults cannot move immediately with a change in salinity, the population center of distribution shifts upstream the year after a dry year as a result of juvenile recruitment. If multiple dry years occur in a row, and both P. amurensis and M. marginata move upstream together, their effects on the food web could be compounded, and phytoplankton and zooplankton biomass could steeply decline in the confluence, affecting higher trophic levels in the estuary.

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Section: P Amurensis Responses To Droughtsupporting

confidence: 83%

Amazing Graze: Shifts in Jellyfish and Clam Distributions During Dry Years in the San Francisco Estuary

Hartman,

Twardochleb,

Burdi

et al. 2024

SFEWS

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“…De soort komt voor in alle sedimenttypen binnen intergetijdengebieden en is goed bestand tegen vervuilde milieus. Gezien zijn voorkeur voor een brakke omgeving (Baumsteiger et al, 2017;Dumoulin & Langeraert, 2020;Nicolini & Penry, 2000;Thompson et al, 2022) is het onwaarschijnlijk dat de soort zich gaat verspreiden door de hele Waddenzee. Lokaal zouden echter hoge dichtheden kunnen ontstaan in de brakkere gebieden zoals de Eems en nabij de Afsluitdijk.…”

Section: Biologieunclassified

Schelpdierbestanden in de Nederlandse kustzone, Waddenzee en zoute deltawateren in 2023

Troost,

van Asch,

Breunesse

et al. 2024

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“…Restoration may be a potential tool to make some habitats less suitable for invasive bivalves. For example, smaller sloughs in Suisun Marsh tend to have lower densities of invasive clams than downstream areas (Baumsteiger et al 2017); therefore, creating more small tidal channels could be beneficial. Similarly, clam densities are lower in San Pablo Bay, where there is heavy grazing pressure from diving ducks (Poulton et al 2004), so perhaps there are ways to create open-water habitats that enhance invasive clam mortality.…”

Section: Invasive Species Detectionmentioning

confidence: 99%

How to Respond? An Introduction to Current Bay–Delta Natural Resources Management Options

Sommer¹

2020

SFEWS

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Long-Term Surveys Show Invasive Overbite Clams (Potamocorbula amurensis) are Spatially Limited in Suisun Marsh, California

Cited by 11 publications

References 31 publications

Amazing Graze: Shifts in Jellyfish and Clam Distributions During Dry Years in the San Francisco Estuary

Amazing Graze: Shifts in Jellyfish and Clam Distributions During Dry Years in the San Francisco Estuary

Schelpdierbestanden in de Nederlandse kustzone, Waddenzee en zoute deltawateren in 2023

How to Respond? An Introduction to Current Bay–Delta Natural Resources Management Options

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