Social attraction used to establish Caspian tern (Hydroprogne caspia) nesting colonies on modified islands at the Don Edwards San Francisco Bay National Wildlife Refuge, California—Final report

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

doi:10.3133/ofr20181136

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Of the 52 banded Caspian terns observed at the newly constructed tern islands in DENWR during 2015-2017 (Hartman et al 2018), only two were originally banded in the Columbia Plateau; neither of these banded individuals were part of the banded bird analysis in this study. Seventy-four percent of the 52 banded Caspian terns seen in DENWR during 2015-2017 were banded in San Francisco Bay, suggesting that the terns nesting on those newly constructed tern islands were mostly from the local region (Hartman et al 2018).…”

Section: Discussionmentioning

confidence: 76%

“…These additional pressures on tern nesting habitat outside of the Columbia Plateau region may have rendered these locations unattractive to terns that previously nested at Goose Island or Crescent Island, and compelled terns to remain within the Columbia Plateau region and compete for nesting space at smaller active colonies or newly colonized nesting habitat. Analyses of resightings of Caspian terns banded as adults in the SONEC region revealed a large increase in net movement rates away Observations by the U.S. Geological Survey at newly constructed alternative nesting islands at Don Edwards National Wildlife Refuge (DENWR) in San Francisco Bay that were created as part of the IAPMP found that they were successful at attracting nesting pairs of Caspian terns beginning in 2015 (Hartman et al 2018). Of the 52 banded Caspian terns observed at the newly constructed tern islands in DENWR during 2015-2017 (Hartman et al 2018), only two were originally banded in the Columbia Plateau; neither of these banded individuals were part of the banded bird analysis in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Analyses of resightings of Caspian terns banded as adults in the SONEC region revealed a large increase in net movement rates away Observations by the U.S. Geological Survey at newly constructed alternative nesting islands at Don Edwards National Wildlife Refuge (DENWR) in San Francisco Bay that were created as part of the IAPMP found that they were successful at attracting nesting pairs of Caspian terns beginning in 2015 (Hartman et al 2018). Of the 52 banded Caspian terns observed at the newly constructed tern islands in DENWR during 2015-2017 (Hartman et al 2018), only two were originally banded in the Columbia Plateau; neither of these banded individuals were part of the banded bird analysis in this study. Seventy-four percent of the 52 banded Caspian terns seen in DENWR during 2015-2017 were banded in San Francisco Bay, suggesting that the terns nesting on those newly constructed tern islands were mostly from the local region (Hartman et al 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Observations by the U.S. Geological Survey at newly constructed alternative nesting islands at Don Edwards National Wildlife Refuge (DENWR) in San Francisco Bay that were created as part of the IAPMP found that they were successful at attracting nesting pairs of Caspian terns beginning in 2015 (Hartman et al 2018). Of the 52 banded Caspian terns observed at the newly constructed tern islands in DENWR during 2015–2017 (Hartman et al 2018), only two were originally banded in the Columbia Plateau; neither of these banded individuals were part of the banded bird analysis in this study.…”

Section: Discussionmentioning

confidence: 99%

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Caspian Tern Response to Managed Reductions in Nesting Habitat

Schniedermeyer

Roby

Lyons

et al. 2020

Wildlife Society Bulletin

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Predation on smolts by Caspian terns (Hydroprogne caspia) has been identified as a factor limiting the restoration of some populations of anadromous salmonids (Oncorhynchus spp.) from the Columbia River basin that are listed under the U.S. Endangered Species Act. Implementation of a management plan to reduce numbers of Caspian terns nesting at the 2 largest colonies in the Columbia Plateau region of Oregon and Washington, USA, began in 2014 and is ongoing. We investigated the response of Caspian terns during 2014-2016 to reductions in nesting habitat at these 2 colonies. Management prevented terns from nesting at both colonies, and the estimated numbers of nesting pairs in the region declined significantly from a mean of 877 pairs during premanagement to 769 and 675 pairs in 2015 and 2016, respectively. The management objective of reducing numbers of nesting terns in the Columbia Plateau region to ≤200 breeding pairs was not achieved during the first 2 years of full implementation of the plan. Regional nesting success did not decline significantly following the initiation of management, and remained at levels considered sufficient to sustain the regional subpopulation. Despite the species' capacity for long-distance breeding dispersal, the majority of displaced terns exhibited stronger than expected philopatry to the Columbia Plateau region. Analysis of resightings of banded terns indicated that most (>80%) terns that nested in the Columbia Plateau region premanagement returned to the region in 2015 and 2016, but the proportion that returned as breeders decreased while the proportion that returned as nonbreeding floaters increased compared with premanagement. The proportion of banded terns that were unobserved also increased during management years, suggesting that more terns became floaters in the Pacific Flyway and went unobserved because they were prospecting and foraging in locations or regions where there was little or no monitoring. The unexpectedly high regional philopatry exhibited by terns during management was likely a reflection of the low availability of suitable alternative nesting habitat outside the region. Most terns that remained in the region displayed considerable flexibility in nest site selection by nesting either at a previously smaller, intermittently successful breeding colony or at a small new colony where nesting activity had not previously been recorded. As long-lived seabirds, Caspian terns may integrate information regarding nesting success over several years before choosing to change nesting locations, longer than the 2 years of this study, especially if alternate locations are distant or intermittently available, or a history of nesting at multiple locations exists within the region.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Caspian Tern Response to Managed Reductions in Nesting Habitat

Schniedermeyer

Roby

Lyons

et al. 2020

Wildlife Society Bulletin

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“…Invasive species eradications have occurred on nearly 1,000 islands worldwide ( 33 ), establishing safe sites for active seabird restoration, particularly when seabirds may not return without human assistance ( 44 ). Control of native seabird predators, such as native mammals and gulls, whose populations are often enhanced by humans, was a common management action at continental and nearshore island restoration sites ( 40 , 45 ).…”

Section: Discussionmentioning

confidence: 99%

Tracking the global application of conservation translocation and social attraction to reverse seabird declines

Spatz

Young

Holmes

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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The global loss of biodiversity has inspired actions to restore nature across the planet. Translocation and social attraction actions deliberately move or lure a target species to a restoration site to reintroduce or augment populations and enhance biodiversity and ecosystem resilience. Given limited conservation funding and rapidly accelerating extinction trajectories, tracking progress of these interventions can inform best practices and advance management outcomes. Seabirds are globally threatened and commonly targeted for translocation and social attraction (“active seabird restoration”), yet no framework exists for tracking these efforts nor informing best practices. This study addresses this gap for conservation decision makers responsible for seabirds and coastal management. We systematically reviewed active seabird restoration projects worldwide and collated results into a publicly accessible Seabird Restoration Database. We describe global restoration trends, apply a systematic process to measure success rates and response times since implementation, and examine global factors influencing outcomes. The database contains 851 active restoration events in 551 locations targeting 138 seabird species; 16% of events targeted globally threatened taxa. Visitation occurred in 80% of events and breeding occurred in 76%, on average 2 y after implementation began (SD = 3.2 y). Outcomes varied by taxonomy, with the highest and quickest breeding response rates for Charadriiformes (terns, gulls, and auks), primarily with social attraction. Given delayed and variable response times to active restoration, 5 y is appropriate before evaluating outcomes. The database and results serve as a model for tracking and evaluating restoration outcomes, and is applicable to measuring conservation interventions for additional threatened taxa.

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