Seabird Indicator
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Birds of Centre Island 105
BIRDSs-OFCENTRE ISLAND By W. J. COOPER Centre Island lies in Foveaux Strait 7 km south of the South Island, 40 km west-southwest of Invercargill and 16 km southwest of Riverton, at 46O27' 30' ' S, 167O50' 30' ' E (Figure 1). The island is about 89 ha and rises FIGURE 1 - Centre Island Most of the island is covered with exotic pasture grasses, club rush (Scirpus nodosus), water-fern (Histiopteris incisa), Carex appressa, and bush lawyer (Rubus cissoides) in varying quantities with clumps of gorse (Ulex europaeus), especially on the northern slopes, and at the eastern end, flax (Phormium colensoi). Some scattered, stunted, wind-shorn macrocarpa trees (Cupressus macrocarpa) are near the houses. The steeper slopes to the south and west have an interesting mat of saltmarsh vegetation with Selleria radicans, Samolus repens, the shore gentian (Gentiana saxosa), Scirpus cemuus, native celery (Apium prostraturn), and Crassula moschata as predominant species. The cliffs, drier soils and rock outcrops feature the blue shore tussock (Poa astonii), Hebe elliptica, and scattered muttonbird scrub (Senecw reirwldii) as dominant species. Some taupata (Coprosma repens) is on coastal banks. 104 COOPER NOTORNIS 38 The dunes backing the beaches to the north and east are dominated by marram (Ammophila arenaria). Pingao (Desmoschoenus spiralis) dominates a small part of the dunes on the northern shore. The island was reserved as "a site for a lighthouse and Premises connected therewith" in 1875 and was occupied by lighthouse keepers from 1878 until 1989, when the lighthouse was automated. Known scientific visits have been few and brief. Maida and Olga Sansom visited Kuru-kuru, a rocky pinnacle below the lighthouse, on 21 November 1955 (Sansom M.L. -
Miles, William Thomas Stead (2010) Ecology, Behaviour and Predator- Prey Interactions of Great Skuas and Leach's Storm-Petrels at St Kilda
Miles, William Thomas Stead (2010) Ecology, behaviour and predator- prey interactions of Great Skuas and Leach's Storm-petrels at St Kilda. PhD thesis. http://theses.gla.ac.uk/2297/ Copyright and moral rights for this thesis are retained by the author A copy can be downloaded for personal non-commercial research or study, without prior permission or charge This thesis cannot be reproduced or quoted extensively from without first obtaining permission in writing from the Author The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the Author When referring to this work, full bibliographic details including the author, title, awarding institution and date of the thesis must be given Glasgow Theses Service http://theses.gla.ac.uk/ [email protected] Ecology, behaviour and predator-prey interactions of Great Skuas and Leach’s Storm-petrels at St Kilda W. T. S. Miles Submitted for the degree of Doctor of Philosophy to the Faculty of Biomedical and Life Sciences, University of Glasgow June 2010 For Alison & Patrick Margaret & Gurney, Edna & Dennis 1 …after sunset, a first shadowy bird would appear circling over the ruins, seen intermittently because of its wide circuit in the thickening light. The fast jerky flight seemed feather-light, to have a buoyant butterfly aimlessness. Another appeared, and another. Island Going (1949 ): Leach’s Petrel 2 Declaration I declare that the work described in this thesis is of my own composition and has been carried out entirely by myself unless otherwise cited or acknowledged. -
LEAST TERN Scientific Name: Sternula Antillarum Lesson Other
Common Name: LEAST TERN Scientific Name: Sternula antillarum Lesson Other Commonly Used Names: Little tern, silver turnlet, sea swallow, minute tern, little striker, and killing peter Previously Used Names: Sterna antillarum Family: Laridae Rarity Ranks: G4/S3 State Legal Status: Rare Federal Legal Status: Interior population listed as endangered. Other populations are not federally listed. Federal Wetland Status: N/A Description: Georgia's smallest tern at about 23 cm (9 in) in length with a 50 cm (20 in) wingspread, the least tern is white with pale gray feathers on the back and upper surfaces of the wings, except for a narrow black stripe along the leading edge of the upper wing feathers. The least tern has a black cap with a small patch of white on the forehead. In summer, the adult has a yellow bill with a black tip and yellow to orange feet and legs. Its tail is deeply forked. In winter, the bill, legs and feet are black. The juvenile has a black bill and yellow legs, and the feathers of the back have dark margins, giving the bird a distinctly "scaled" appearance. The least tern's small size, white forehead, and yellow bill serve to distinguish it from other terns. Similar Species: The adult sandwich tern (Thalasseus sandvicensis) is the most similar species to the adult least tern, but is much larger at about 38 cm (15 in) in length and has a black bill with a pale (usually yellow) tip and black legs. Juvenile least terns and sandwich terns look very similar in appearance. -
Seabirds in Southeastern Hawaiian Waters
WESTERN BIRDS Volume 30, Number 1, 1999 SEABIRDS IN SOUTHEASTERN HAWAIIAN WATERS LARRY B. SPEAR and DAVID G. AINLEY, H. T. Harvey & Associates,P.O. Box 1180, Alviso, California 95002 PETER PYLE, Point Reyes Bird Observatory,4990 Shoreline Highway, Stinson Beach, California 94970 Waters within 200 nautical miles (370 km) of North America and the Hawaiian Archipelago(the exclusiveeconomic zone) are consideredas withinNorth Americanboundaries by birdrecords committees (e.g., Erickson and Terrill 1996). Seabirdswithin 370 km of the southern Hawaiian Islands (hereafterreferred to as Hawaiian waters)were studiedintensively by the PacificOcean BiologicalSurvey Program (POBSP) during 15 monthsin 1964 and 1965 (King 1970). Theseresearchers replicated a tracklineeach month and providedconsiderable information on the seasonaloccurrence and distributionof seabirds in these waters. The data were primarily qualitative,however, because the POBSP surveyswere not basedon a strip of defined width nor were raw counts corrected for bird movement relative to that of the ship(see Analyses). As a result,estimation of density(birds per unit area) was not possible. From 1984 to 1991, using a more rigoroussurvey protocol, we re- surveyedseabirds in the southeasternpart of the region (Figure1). In this paper we providenew informationon the occurrence,distribution, effect of oceanographicfactors, and behaviorof seabirdsin southeasternHawai- ian waters, includingdensity estimatesof abundant species. We also document the occurrenceof six speciesunrecorded or unconfirmed in thesewaters, the ParasiticJaeger (Stercorarius parasiticus), South Polar Skua (Catharacta maccormicki), Tahiti Petrel (Pterodroma rostrata), Herald Petrel (P. heraldica), Stejneger's Petrel (P. Iongirostris), and Pycroft'sPetrel (P. pycrofti). STUDY AREA AND SURVEY PROTOCOL Our studywas a piggybackproject conducted aboard vessels studying the physicaloceanography of the easterntropical Pacific. -
Recent Establishments and Extinctions of Northern Gannet Morus Bassanus Colonies in North Norway, 1995-2008
Recent establishments and extinctions of Northern Gannet Morus bassanus colonies in North Norway, 1995-2008 Robert T. Barrett Barrett, R.T. 2008. Recent establishments and extinctions of Northern Gannet Morus bassanus colonies in North Norway, 1995-2008. – Ornis Norvegica 31: 172-182. Since the last published review of the development of the Northern Gannet Morus bassanus population in Norway (Barrett & Folkestad 1996), there has been a general increase in numbers breeding in North Norway from ca. 2200 occupied nests in 1995 to ca. 2700 in 2008. In Lofoten and Vesterålen, however, numbers have decreased from 1500 occupied nests in 1989 to 500 in 2008, and what were the two largest colonies on Skarvklakken and Hovsflesa have been abandoned. Small colonies have, in the meantime, been established in the region, but these are all characteristically unstable. A new colony established in Troms in 2001 increased to 400 occupied sites in 2007, but the population dropped to 326 in 2008. Harassment by White-tailed eagles Haliaeetus albicilla is mooted as the main cause of the decline in Lofoten and Vesterålen. Robert T. Barrett, Dept. of Natural Science, Tromsø University Museum, N-9037 Tromsø, Norway. INTRODUCTION the well-established colonies, Skarvklakken and Hovsflesa in the north of the country, there were Apart from perhaps the Great Skua Catharacta even signs of declines between 1991 and 1995. skua, there is no species whose establishment as a This paper documents the subsequent fate of the breeding bird in Norway and subsequent popula- North Norwegian colonies, including the extinc- tion development has been so well documented tion of some and the establishment of others. -
BROWN SKUAS Stercorarius Antarcticus INCUBATE a MACARONI PENGUIN EUDYPTES CHRYSOLOPHUS EGG at MARION ISLAND
Clokie & Cooper: Skuas incubate a Macaroni Penquin egg 59 BROWN SKUAS STERCORARIUS antarcticus INCUBATE A MACARONI PENGUIN EUDYPTES CHRYSOLOPHUS EGG AT MARION ISLAND LINDA CLOKIE1 & JOHN COOPER2,3 1Marine & Coastal Management Branch, Department of Environmental Affairs, Private Bag X2, Rogge Bay 8012, South Africa 2Animal Demography Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, South Africa 3DST/NRF Centre of Excellence for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa ([email protected]) Received 3 October 2009, accepted 5 February 2010 Brown/Sub-antarctic Skua Stercorarius antarcticus are widely -sized for skua eggs, thus deemed to be the birds’ own clutch, but distributed at cool-temperate and sub-Antarctic islands in the the third was an all-white egg (Fig. 1). This egg was noticeably Southern Ocean, where their diet includes burrowing petrels caught larger than the two skua eggs, and was more rounded in shape. at night and eggs stolen from incubating birds, especially penguins, On 19 December when the nest was revisited one of the two skua during the day (Furness 1987, Higgins & Davies 1996, Shirihai eggs was no longer present. During visits on 21 December 2008 2007). At Marion Island, Prince Edward Islands in the southern and on 4 and 15 January 2009 only the white egg was present, and Indian Ocean, Brown Skua prey on eggs of crested penguins the displaced incubating bird was quick to defend its nest. On 9 Eudyptes sp. during summer months which they remove in their February 2009 the skua pair was still present at the nest, with one bills from the colonies by flying to nearby middens where the eggs’ bird in an incubating position, but the nest was empty of contents. -
Assessment of Great Skua Stercorarius Skua Pellet Composition to Inform Estimates of Storm Petrel Consumption from Bioenergetics Models
Storm Petrels in Great Skua pellets Assessment of Great Skua Stercorarius skua pellet composition to inform estimates of storm petrel consumption from bioenergetics models Zoe Deakin1*, Lucy Gilbert2, Gina Prior3 and Mark Bolton4 * Correspondence author. Email: [email protected] 1 School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK; 2 Institute of Biodiversity, Animal Health and Comparative Medicine, Graham Kerr Building, University of Glasgow G12 8QQ, UK; 3 National Trust for Scotland, Balnain House, 40 Huntly Street, Inverness, IV3 5HR, UK; 4 RSPB Centre for Conservation Science, The Lodge, Sandy, Bedfordshire SG19 2DL, UK Abstract Generalist predators may exert levels of predation on particular prey that result in, or contribute to, decline of that prey species. Bioenergetics models have been used to estimate the rates of consumption of Leach’s Storm Petrels Oceanodroma leucorhoa (45 g) and European Storm Petrels Hydrobates pelagicus (25 g) by Great Skuas Stercorarius skua on St Kilda (Western Isles, UK) and Hermaness (Shetland, UK). The models require estimates of the number of indigestible pellets produced from each individual storm petrel consumed, which have previously been determined by captive feeding trials or examination of pellets cast by free-living birds, but which have not discriminated between the two storm petrel species. Here we use information from dissection of 427 Great Skua pellets collected on Hirta (St Kilda, UK) and Mousa (Shetland, UK) to provide empirical estimates of the pellet:prey ratios for Leach’s and European Storm Petrels separately. We found that pellet:prey ratios were similar for collections of the ‘standing crop’ of pellets accumulated over the entire breeding season and samples of pellets cast within the preceding five days. -
How Seabirds Plunge-Dive Without Injuries
How seabirds plunge-dive without injuries Brian Changa,1, Matthew Crosona,1, Lorian Strakerb,c,1, Sean Garta, Carla Doveb, John Gerwind, and Sunghwan Junga,2 aDepartment of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061; bNational Museum of Natural History, Smithsonian Institution, Washington, DC 20560; cSetor de Ornitologia, Museu Nacional, Universidade Federal do Rio de Janeiro, São Cristóvão, Rio de Janeiro RJ 20940-040, Brazil; and dNorth Carolina Museum of Natural Sciences, Raleigh, NC 27601 Edited by David A. Weitz, Harvard University, Cambridge, MA, and approved August 30, 2016 (received for review May 27, 2016) In nature, several seabirds (e.g., gannets and boobies) dive into wa- From a mechanics standpoint, an axial force acting on a slender ter at up to 24 m/s as a hunting mechanism; furthermore, gannets body may lead to mechanical failure on the body, otherwise known and boobies have a slender neck, which is potentially the weakest as buckling. Therefore, under compressive loads, the neck is po- part of the body under compression during high-speed impact. In tentially the weakest part of the northern gannet due to its long this work, we investigate the stability of the bird’s neck during and slender geometry. Still, northern gannets impact the water at plunge-diving by understanding the interaction between the fluid up to 24 m/s without injuries (18) (see SI Appendix, Table S1 for forces acting on the head and the flexibility of the neck. First, we estimated speeds). The only reported injuries from plunge-diving use a salvaged bird to identify plunge-diving phases. -
The Behaviour of the Gannet by J
The behaviour of the Gannet By J. B. Nelson (Concluded from page 2 88) EGG LAYING THE ECOLOGY OF the egg laying of the Gannet Sula bassana (effect of density, age and nest position on the onset and synchronisation of laying) is discussed elsewhere (Nelson 1964a and in preparation). The act of deposition was observed on five occasions on all of which the tail was depressed and guided the egg into the nest—important in view of the Gannet's poorly developed retrieving ability. The one accurately timed laying took two minutes. Eggs may be laid at any time of day, and possibly also at night. INCUBATION Gannets (and apparently all Sulidae) lack brood patches and incubate their single egg beneath their webs, which become highly vascularised and hot during incubation. Non-breeding birds caught during the breeding season had cool webs, but no known breeders were caught off the nest, so it was not known whether webs remain hot. Howell and Bartholomew (1962) showed that the mean internal temperature of incubated eggs of the Red-footed Booby S. sula was 36° C. and the foot temperature 3 5.8° C, and suggested that the feet do not provide the main source of heat for incubation. They were vague in their alternative and the difference in the temperatures they recorded would seem too small to disprove the conventional view. The egg tempera ture achieved by this method compares favourably with that of brood- spot incubation (e.g. 36.6° C. for the surface temperature of Herring Gulls' eggs: Baerends 1959). -
Bird Checklist for St. Johns County Florida (As of January 2019)
Bird Checklist for St. Johns County Florida (as of January 2019) DUCKS, GEESE, AND SWANS Mourning Dove Black-bellied Whistling-Duck CUCKOOS Snow Goose Yellow-billed Cuckoo Ross's Goose Black-billed Cuckoo Brant NIGHTJARS Canada Goose Common Nighthawk Mute Swan Chuck-will's-widow Tundra Swan Eastern Whip-poor-will Muscovy Duck SWIFTS Wood Duck Chimney Swift Blue-winged Teal HUMMINGBIRDS Cinnamon Teal Ruby-throated Hummingbird Northern Shoveler Rufous Hummingbird Gadwall RAILS, CRANES, and ALLIES American Wigeon King Rail Mallard Virginia Rail Mottled Duck Clapper Rail Northern Pintail Sora Green-winged Teal Common Gallinule Canvasback American Coot Redhead Purple Gallinule Ring-necked Duck Limpkin Greater Scaup Sandhill Crane Lesser Scaup Whooping Crane (2000) Common Eider SHOREBIRDS Surf Scoter Black-necked Stilt White-winged Scoter American Avocet Black Scoter American Oystercatcher Long-tailed Duck Black-bellied Plover Bufflehead American Golden-Plover Common Goldeneye Wilson's Plover Hooded Merganser Semipalmated Plover Red-breasted Merganser Piping Plover Ruddy Duck Killdeer GROUSE, QUAIL, and ALLIES Upland Sandpiper Northern Bobwhite Whimbrel Wild Turkey Long-billed Curlew GREBES Hudsonian Godwit Pied-billed Grebe Marbled Godwit Horned Grebe Ruddy Turnstone FLAMINGOS Red Knot American Flamingo (2004) Ruff PIGEONS and DOVES Stilt Sandpiper Rock Pigeon Sanderling Eurasian Collared-Dove Dunlin Common Ground-Dove Purple Sandpiper White-winged Dove Baird's Sandpiper St. Johns County is a special place for birds – celebrate it! Bird Checklist -
Updating the Seabird Fauna of Jakarta Bay, Indonesia
Tirtaningtyas & Yordan: Seabirds of Jakarta Bay, Indonesia, update 11 UPDATING THE SEABIRD FAUNA OF JAKARTA BAY, INDONESIA FRANSISCA N. TIRTANINGTYAS¹ & KHALEB YORDAN² ¹ Burung Laut Indonesia, Depok, East Java 16421, Indonesia ([email protected]) ² Jakarta Birder, Jl. Betung 1/161, Pondok Bambu, East Jakarta 13430, Indonesia Received 17 August 2016, accepted 20 October 2016 ABSTRACT TIRTANINGTYAS, F.N. & YORDAN, K. 2017. Updating the seabird fauna of Jakarta Bay, Indonesia. Marine Ornithology 45: 11–16. Jakarta Bay, with an area of about 490 km2, is located at the edge of the Sunda Straits between Java and Sumatra, positioned on the Java coast between the capes of Tanjung Pasir in the west and Tanjung Karawang in the east. Its marine avifauna has been little studied. The ecology of the area is under threat owing to 1) Jakarta’s Governor Regulation No. 121/2012 zoning the northern coastal area of Jakarta for development through the creation of new islands or reclamation; 2) the condition of Jakarta’s rivers, which are becoming more heavily polluted from increasing domestic and industrial waste flowing into the bay; and 3) other factors such as incidental take. Because of these factors, it is useful to update knowledge of the seabird fauna of Jakarta Bay, part of the East Asian–Australasian Flyway. In 2011–2014 we conducted surveys to quantify seabird occurrence in the area. We identified 18 seabird species, 13 of which were new records for Jakarta Bay; more detailed information is presented for Christmas Island Frigatebird Fregata andrewsi. To better protect Jakarta Bay and its wildlife, regular monitoring is strongly recommended, and such monitoring is best conducted in cooperation with the staff of local government, local people, local non-governmental organization personnel and birdwatchers. -
LEAST TERN Sternula Antillarum Non-Breeding Visitor, Occasional; Rare Breeding Visitor Monotypic
LEAST TERN Sternula antillarum non-breeding visitor, occasional; rare breeding visitor monotypic The Least Tern breeds across the s. United States S through Mexico and the Caribbean, and it winters in C-S America (AOU 1998). This species and the closely related Little Tern are difficult to distinguish, which has led to uncertainty about the status of each species in the Hawaiian Islands (Clapp 1989; see Little Tern). Least Tern appears to be more common than Little Tern, with substantiated records from Midway to Hawaii I, confirmed breeding attempts at both of these locations, and evidence for successful reproductive efforts as well on O'ahu and possibly French Frigate Shoals. As with Little Tern, the majority of records involve adults and one-year old birds in May- Aug, and several records of juvenile and first-fall birds in Aug-Oct reflect the likelihood of local reproduction. Least and Little terns were split at the genus level from Sterna by the AOU (2006). In the Northwestern Hawaiian Islands, well-documented Least Terns have been recorded from Kure 6-8 Aug 2016 (HRBP 6662-6663); Midway 5-10 May 1989, 13-14 Sep 1990 (2 individuals), 5-22 Jul 1993 (pair), 15 Jun-Sep 1999 (3 adults involved in an unsuccessful breeding attempt; Pyle et al. 2001, NAB 53:436; HRBP 1234-1236, 1289- 1292 published NAB 55:5-6), 8 (along with 2 Little Terns) 8-10 Sep 2002 (Rowlett 2002), 2 on 22 Jun 2015 (HRBP 6658), and at least 2 (among 12 Sternula terns) 22 Oct 2016 (HRBP 6664).