Distribution, Numbers and Age Structure of Relict Gull Larus relictus in Bohai Bay, China

Liu, Yang; Holt, Paul; Lei, Juan; Zhang, Yu; Zhang, Zhengwang

doi:10.1675/1524-4695(2006)29[375:dnaaso]2.0.co;2

Cited by 7 publications

(15 citation statements)

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“…Maximum monthly numbers of shorebirds at Zuidong in Tangshan (including 22 km 2 of intertidal flats) in 2004(2004data from Yang et al 2008. The white and black bars give the predicted and counted peak numbers at the core study sites in 2000-2002, 2004 and 2006-2010 respectively. previously the most important known wintering ground, especially for adults (Liu et al 2006). Interestingly, the largest number of Relict Gulls occurred in Tianjin (8,230 birds, of which 7,880 birds were found in the Jingqu sub-area, south of the Duliujian estuary and not part of our study area; Fig.…”

Section: Discussionmentioning

confidence: 71%

“…The coast of Bohai Bay is crucial to waterbirds, especially shorebirds and gulls that make stopovers there during northward and southward migration, or winter there, including Relict Gull Larus relictus, listed as 'Vulnerable' by IUCN (2010) and BirdLife International (2010a), Saunders's Gull L. saundersi, Eurasian Curlew Numenius arquata, Red Knot Calidris canutus, Curlew Sandpiper C. ferruginea and Marsh Sandpiper Tringa stagnatilis (Li et al 1996, Barter 2002, Battley et al 2005, Minton et al 2006, Yang and Zhang 2006, Liu et al 2007, Yang et al 2008. The majority of Red Knot during northward migration, and the largest wintering populations of Eurasian Curlew and Relict Gull, were counted in Bohai Bay along the EAAF (Barter et al 2001, Liu et al 2006, Cao et al 2009. Concerns about the accelerating tidal flat reclamation along the Bohai Bay coast, and the potential effects on waterbirds dependent on the bay, have been voiced earlier (Barter et al 2003, Liu et al 2006, Yang et al 2008.…”

Section: Introductionmentioning

confidence: 99%

“…ferruginea and Marsh Sandpiper Tringa stagnatilis (Li et al 1996, Barter 2002, Battley et al 2005, Minton et al 2006, Yang and Zhang 2006, Liu et al 2007, Yang et al 2008). The majority of Red Knot during northward migration, and the largest wintering populations of Eurasian Curlew and Relict Gull, were counted in Bohai Bay along the EAAF (Barter et al 2001, 2003, Liu et al 2006, Cao et al 2009). Concerns about the accelerating tidal flat reclamation along the Bohai Bay coast, and the potential effects on waterbirds dependent on the bay, have been voiced earlier (Barter et al 2003, Liu et al 2006, Yang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Impacts of tidal land reclamation in Bohai Bay, China: ongoing losses of critical Yellow Sea waterbird staging and wintering sites

Yang

Chen

Barter

et al. 2011

Bird Conservation International

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148

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SummaryThe coast of Bohai Bay, north-western Yellow Sea, is critical for waterbirds migrating along the East Asia-Australasian Flyway. Between 1994 and 2010, a total of 450 km 2 of offshore area, including 218 km 2 of intertidal flats (one third of the original tidal area in the bay), has been reclaimed along the bay for two industrial projects. This has caused the northward migrants to become concentrated in an ever smaller remaining area, our core study site. The spring peak numbers of two Red Knot subspecies in the East Asia-Australasian Flyway, Calidris canutus piersmai and C. c. rogersi, in this so far little affected area increased from 13% in 2007 to 62% in 2010 of the global populations; the spring peak numbers of Curlew Sandpiper C. ferruginea increased from 3% in 2007 to 23% in 2010 of the flyway population. The decline in the extent of intertidal mudflats also affected Relict Gulls Larus relictus, listed by IUCN as 'Vulnerable'; during normal winters 56% of the global population moved from the wintering habitats that were removed in Tianjin to the relatively intact areas around Tangshan. Densities of wintering Eurasian Curlew Numenius arquata, and spring-staging Broad-billed Sandpiper Limicola falcinellus and Sanderling Calidris alba have also increased in the remaining areas. With the proposed continuation of land reclamation in Bohai Bay, we predict waterbird densities in the remaining areas to increase to a point of collapse. To evaluate the future of these fragile, shared international resources, it is vital to promote an immediate conservation action plan for the remaining coastal wetlands in this region, and continued population monitoring to determine the effects of this action.

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Section: Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impacts of tidal land reclamation in Bohai Bay, China: ongoing losses of critical Yellow Sea waterbird staging and wintering sites

Yang

Chen

Barter

et al. 2011

Bird Conservation International

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148

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“…The reason for this mismatch between tracking and ringing data could be the result of a small sample size of tracked adults and sightings of ringed gulls in relation to the migrating fraction of the population. Besides, the longer distances from the colony to the sighting sites observed in immatures may be the result of the existence of differential migration by age class, as was also observed in other gull species (Liu et al 2006). However, this result has to be taken with caution, as ringing data may provide information on staging areas and not the final destination used as wintering grounds.…”

Section: Discussionmentioning

confidence: 93%

“…data). Another potential hypothesis might be linked to the fact that non-breeders can afford migrating longer distances in comparison to adults, as they do not have to come back to the colonies to breed earlier (Liu et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Distribution of Olrog’s GullLarus atlanticusfrom Bahía San Blas during the non-breeding period: signals of partial migration

Copello

Suárez

Yorio

et al. 2020

Bird Conservation International

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Summary The Olrog’s Gull Larus atlanticus is an endemic and threatened species of the south-western Atlantic. Little is known about its movements during the non-breeding period. The objective of this study was to analyse the migration of the species by tracking adults from Bahía San Blas (Buenos Aires province, Argentina) with geolocators and using information of sightings of ringed gulls. Differences between males and females were evaluated using tracking data and ringed data were used to determine age differences. A single core area (kernel 50%) from 21 tracked birds was identified. This area included the study colony and also other breeding colonies located up to 300 km to the north. The range area (kernel 95%) included coastal areas up to 1,000 km from the colony. All sightings of ringed gulls (n = 41) occurred north of the breeding colony, however 12 adult individuals were sighted during the winter in its breeding grounds. Our results suggest the occurrence of partial migration behavior in Olrog’s Gull. The migration pattern reported here implies than during the non-breeding season, breeding and wintering areas away from the nesting grounds should be considered as one system in the design of conservation strategies for this regionally threatened gull.

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Mammalian predators and vegetated nesting habitat drive reduced protected area nesting success of Kentish plovers, Yellow Sea region, China

Bai

Lei

et al. 2023

Ecology and Evolution

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Protected areas provide essential habitats for wildlife by conserving natural and seminatural habitats and reducing human disturbance. However, whether breeding birds vulnerable to nest predation can benefit from strict land management in the protected area is unclear. Here, we compare the nesting performance of two groups of a groundnesting shorebird, the Kentish plover (Charadrius alexandrinus), in the protected area (Liaohekou Natural Reserve, hereinafter PA), and the control non-protected area (non-PA) around the Liaohekou Natural Reserve, in the north of the Yellow Sea, China, and identify which environmental factors, such as nesting habitat and nest materials, influence the daily nest survival rate (DSR). We found similar nesting habitats in both study areas, dominated by bare land or Suaeda salsa grassland. However, DSR was lower in PA (0.91 ± 0.01) than in non-PA (0.97 ± 0.01). Kentish plovers nesting in areas with vegetation cover experienced lower DSR than in bare lands in both areas, and nests built with materials of S. salsa sticks had the lowest DSR in the bare land. Data from infrared cameras confirmed relatively higher predator abundances and nest predation rates by nocturnal mammals, such as Eurasian badgers (Meles meles), in PA than in non-PA, and this pattern was especially evident for plover nests located in S. salsa grassland. Our results suggest that Liaohekou Natural Reserve protected area may not necessarily provide safe nesting sites for Kentish plovers due to the abundance of

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Distribution, Numbers and Age Structure of Relict Gull Larus relictus in Bohai Bay, China

Cited by 7 publications

References 0 publications

Impacts of tidal land reclamation in Bohai Bay, China: ongoing losses of critical Yellow Sea waterbird staging and wintering sites

Impacts of tidal land reclamation in Bohai Bay, China: ongoing losses of critical Yellow Sea waterbird staging and wintering sites

Distribution of Olrog’s GullLarus atlanticusfrom Bahía San Blas during the non-breeding period: signals of partial migration

Mammalian predators and vegetated nesting habitat drive reduced protected area nesting success of Kentish plovers, Yellow Sea region, China

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