A former dairy pasture in California underwent a major transformation after levees were removed to restore tidal wetlands at the Giacomini Wetlands.
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levees → undergo → Wetlands
The restoration allowed tidal waters to return, triggering rapid changes in vegetation and wildlife.
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waters → allow → vegetation
Over the following years, salt and brackish marsh expanded, while native-dominated plant communities increased and non-native-dominated communities declined.
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communities → expand → years
Waterbird numbers grew sharply in the initial years after restoration, reaching a record high of approximately 16,000 birds counted on a single day in December 2013.
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numbers → grow → December
Ten-year monitoring found that the restored wetland had entered a more stable ecological condition.
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wetland → find → condition
How did California’s former dairy pasture change after levee breaching
The vegetation changes continued during the years after restoration.
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changes → change → restoration
The National Park Service reported that salt and brackish marsh communities had increased by 143 acres by 2018 compared with the 2003 pre-restoration mapping, rising from 9 per cent of the project area to 37 per cent.
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communities → report → cent
Native California cordgrass also expanded substantially, growing across 21 per cent of the project area compared with 0.02 per cent before restoration.
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cordgrass → expand → restoration
The restoration also changed the balance between native- and non-native-dominated vegetation.
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restoration → change → vegetation
According to the National Park Service, non-native-dominated and mixed-nativity communities declined from 327 acres in 2008 to 164 acres in 2018, while native-dominated communities increased from 80 acres to 257 acres over the same period.
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communities → accord → period
The agency said the site had developed greater diversity of plant communities, become more similar to native reference marshes and provided valuable habitat for wildlife.
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site → say → wildlife
Waterbird numbers change after California marsh restoration
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numbers → change → restoration
According to a monitoring summary by Avocet Research Associates, published by the National Park Service, “Waterbird numbers grew sharply in the initial years following restoration”, with a record high of approximately 16,000 waterbirds counted on a single day in December 2013.
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numbers → accord → December
The source also reported that numbers began tapering off in 2014 and 2015 and remained similar during monitoring in 2017 and 2018.
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numbers → report → 2017
Two surface-feeding duck species were particularly abundant after restoration.
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species → feed → restoration
Green-winged teal and American wigeon together accounted for 43.3 per cent of all waterbirds present between September and February.
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teal → account → September
The source said the reduced waterbird numbers at Giacomini might have reflected changes in regional migration patterns caused by other tidal wetland restoration projects in San Francisco Bay, while another possibility was that resources had been limited by the early abundance of waterfowl.
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resources → say → waterfowl
Image AI generated
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AI → generate → ?
How did Giacomini Wetlands change after restoration
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Wetlands → change → restoration
The increase in birds was part of wider ecological changes recorded at Giacomini.
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increase → record → Giacomini
However, the source said the rapid growth eventually gave way to a more stable ecological condition as newly created niches became occupied and abundant resources were depleted.
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resources → say → condition
By the period between Year 5 and Year 10, the Giacomini Wetlands had reached what the National Park Service described as a “dynamic equilibrium” condition.
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Service → reach → condition
The agency said that while birds, native fish and benthic invertebrates appeared to have reached a sustainable status quo, less tangible indicators such as biogeochemical processes and nutrient cycles might still have been changing.
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indicators → say → processes
The Aporia
