Social attraction used to establish Caspian tern nesting colonies in San Francisco Bay

Hartman, C. Alex; Ackerman, Joshua T.; Herzog, Mark P.; Strong, Cheryl; Trachtenbarg, David

doi:10.1016/j.gecco.2019.e00757

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…ponds, aided in part by social attraction efforts (Hartman et al 2019;Hartman et al 2020), and American Avocet have nested at all four enhanced ponds. In addition, Forster's Tern nest abundance has increased substantially at New Chicago Marsh where nest success is lower (Ackerman et al 2014c), and new colonies have been established in Ravenswood Pond SF2 and the Redwood Shores Nob Hill Market area.…”

Section: Discussionmentioning

confidence: 99%

Breeding Waterbird Populations Have Declined in South San Francisco Bay: An Assessment Over Two Decades

Hartman¹,

Ackerman²,

Schacter³

et al. 2021

SFEWS

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Availability of wetlands with low salinities during the breeding season can influence waterfowl reproductive success and population recruitment. Salinities as low as 2 ppt (3.6 mScm–1) can impair duckling growth and influence behavior, with mortality occurring above 9 ppt (14.8 mScm–1). We used satellite imagery to quantify the amount of available water, and sampled surface water salinity at Grizzly Island, in the brackish Suisun Marsh, at three time-periods during waterfowl breeding (April, May, July) over 4 years (2016–2019). More water was available and salinity was lower during wetter years (2017, 2019) than during drier years (2016, 2018), and the amount of water in wetlands decreased 73%–86% from April to July. Across all time-periods and years, the majority (64%–100%) of wetland habitat area had salinities above what has been shown to negatively affect ducklings (> 2 ppt), and up to 42% of wetland area had salinities associated with duckling mortality (> 9 ppt). During peak duckling production in May, 81%–95% of available water had salinity above 2 ppt, and 5%–21% was above 9 ppt. In May of the driest year (2016), only 0.5 km2 of low-salinity water (< 2 ppt) was available to ducklings in the study area, compared to 2.6 km2 in May of the wettest year (2017). Private duck clubs own the majority of wetland habitat at Grizzly Island and consistently had a greater percentage of land flooded during summer than did publicly owned wetlands, but private wetlands generally had higher salinities than public wetlands, likely because they draw from higher-salinity water sources. By July, few wetlands remained flooded, and most had salinities high enough to impair duckling growth and survival. Local waterfowl populations would benefit from management practices that provide fresher water during peak duckling production in May and retain more water through July.

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Section: Discussionmentioning

confidence: 99%

Breeding Waterbird Populations Have Declined in South San Francisco Bay: An Assessment Over Two Decades

Hartman¹,

Ackerman²,

Schacter³

et al. 2021

SFEWS

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“…The alternative colony sites that were created/enhanced for Caspian terns in San Francisco Bay as part of the IMP were colonized in the fi rst breeding season after completion (2015; Hartman et al 2019 ); however, resightings of previously banded terns indicated that most terns that initially colonized the alternative sites in San Francisco Bay were from other extant colonies in the bay area (Roby et al 2021 ). In contrast, the alternative colony sites constructed for tern nesting in the SONEC region as part of the EMP saw a considerable infl ux of terns that had been banded at Crescent or Goose islands and displaced by management (Roby et al 2021 ).…”

Section: Management In the Columbia Plateau Regionmentioning

confidence: 99%

Fisheries Volume 49 Number 2 February 2024

2024

Fisheries

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“…The alternative colony sites that were created/enhanced for Caspian terns in San Francisco Bay as part of the IMP were colonized in the first breeding season after completion (2015; Hartman et al 2019); however, resightings of previously banded terns indicated that most terns that initially colonized the alternative sites in San Francisco Bay were from other extant colonies in the bay area (Roby et al 2021). In contrast, the alternative colony sites constructed for tern nesting in the SONEC region as part of the EMP saw a considerable influx of terns that had been banded at Crescent or Goose islands and displaced by management (Roby et al 2021).…”

Section: Management In the Columbia Plateau Regionmentioning

confidence: 99%

Section: Management To Reduce Caspian Tern Predation On Smolts In The...mentioning

confidence: 99%

Caspian Tern Management to Increase Survival of Juvenile Salmonids in the Columbia River Basin: Progress and Adaptive Management Considerations

Collis,

Roby,

Evans

et al. 2023

Fisheries

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Predation by Caspian terns Hydroprogne caspia is a factor limiting the recovery of some Endangered Species Act‐listed populations of salmonids from the Columbia River basin, especially steelhead Oncorhynchus mykiss). This prompted the development and implementation of two separate management plans, one in the Columbia River estuary and the other in the Columbia Plateau region, to reduce the impact of Caspian tern predation on smolt survival. Caspian terns nesting at managed breeding colonies within the basin were relocated to alternative nesting islands created for terns outside the basin. Both plans were successful in significantly reducing smolt losses to Caspian terns nesting at managed sites; however, new developments have led to regression in smolt survival gains associated with tern management. Adaptive management to prevent terns at managed colonies from relocating to nest elsewhere in the basin and to improve nesting opportunities for Caspian terns outside the basin are needed to maximize the survival benefits to Endangered Species Act ‐listed salmonids from management. Adaptive management is also necessary to ensure the long‐term viability of the Pacific Flyway population of Caspian terns, whose breeding population has declined by more than 50% since the two management plans were implemented.

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Social attraction used to establish Caspian tern nesting colonies in San Francisco Bay

Cited by 7 publications

References 26 publications

Breeding Waterbird Populations Have Declined in South San Francisco Bay: An Assessment Over Two Decades

Breeding Waterbird Populations Have Declined in South San Francisco Bay: An Assessment Over Two Decades

Fisheries Volume 49 Number 2 February 2024

Caspian Tern Management to Increase Survival of Juvenile Salmonids in the Columbia River Basin: Progress and Adaptive Management Considerations

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