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Articles 1471 - 1500 of 163042
Full-Text Articles in Entire DC Network
Contents, Pacific Seabird Group
Front Cover, Pacific Seabird Group
Inside Front Cover, Pacific Seabird Group
Author Instructions, Pacific Seabird Group
Reviews: Vagrancy In Birds (Lees, A., & Gilroy, J.); Audubon At Sea: The Coast And Transatlantic Adventures Of John Jame Audubon / With A Forward By Subhankar Bangerjee (Irmscher, C. & King, R.J.); New(Ish) And Noteworthy: Neptune’S Laboratory: Fantasy, Fear, And Science At Sea (Adler, A.); Down To Earth: Politics In The New Climatic Regime (Latour, B.); Birds And Us: A 12,000-Year History From Cave Art To Conservation (Birkhead, T.); Seabirds Of Southern Africa, Second Edition (Ryan, P.), Ginger A. Rebstock, Romaric Moncrieffe, Eric Wagner
Marine Ornithology
No abstract provided.
Diet Composition Of Adelie Penguins Pygoscelis Adeliae At Hope/Esperanza Bay During 2014-2019, A.M. Silvestro, R. Casaux
Diet Composition Of Adelie Penguins Pygoscelis Adeliae At Hope/Esperanza Bay During 2014-2019, A.M. Silvestro, R. Casaux
Marine Ornithology
In this study, we obtained samples through stomach lavage to determine the diet of Adelie Penguins Pygoscelis adeliae during the guard and crèche periods at Hope/Esperanza Bay, Antarctica, during four breeding seasons (2014–2019, except 2016). Antarctic krill was the dominant prey, contributing > 99.6% of the diet by mass. The remainder of prey were fish, amphipods, and mollusks. Among fish, the nototheniid Pleuragramma antarcticum was the most frequent while the bathydraconid Parachaenichthys charcoti dominated by mass. Mollusks and fish increased their contribution during the crèche period in accord with seasonal patterns elsewhere.
Stable Isotope-Determined Diets Of Black Oystercatchers Haematopus Bachmani In The Northern Gulf Of Alaska, Brooke Carney, David Tessler, Heather Coletti, Jeffrey M. Welker, Douglas Causey
Stable Isotope-Determined Diets Of Black Oystercatchers Haematopus Bachmani In The Northern Gulf Of Alaska, Brooke Carney, David Tessler, Heather Coletti, Jeffrey M. Welker, Douglas Causey
Marine Ornithology
Black Oystercatchers Haematopus bachmani (BLOY) feed on intertidal invertebrates along coasts of the northern Gulf of Alaska and elsewhere. Details of their feeding ecology have only been marginally delineated, however, and as population sizes are small and limited geographically, rapid ecological changes may alter their prey base, placing BLOY resiliency in jeopardy. We examined the diets of BLOYs occupying the coast at three sites in Southeast Alaska using stable isotope analysis of carbon (δ13C) and nitrogen (δ15N) to answer the following three questions: (1) what are the diet proportions of prey groups consumed at different locations along the northern Gulf …
High-Contrast Banners Designed To Deter Seabirds From Gillnets Reduce Target Fish Catch, William A. Montevecchi, Jessika Lamarre, Yann Rouxel, Marina W. Montevecchi, Robert J. Blackmore, Christina Bourne, Caleb S. Spiegel
High-Contrast Banners Designed To Deter Seabirds From Gillnets Reduce Target Fish Catch, William A. Montevecchi, Jessika Lamarre, Yann Rouxel, Marina W. Montevecchi, Robert J. Blackmore, Christina Bourne, Caleb S. Spiegel
Marine Ornithology
The incidental catch of non-target species in fishing gear (i.e., bycatch) is a global threat to sustainability and conservation in marine systems. Seabirds experience substantial bycatch mortality, with gillnets having the greatest impacts of any fishing gear. Widespread mitigation to reduce seabird bycatch in gillnet fisheries is tenuous, and information on bycatch in inshore surface-set gillnets remains a major knowledge gap. To help address these issues, we collaborated with commercial fishers to test the efficacy of high-contrast banners designed to alert seabirds. In waters of Newfoundland, Canada, banners were attached to surface-set gillnets for Atlantic Herring Clupea harengus and were …
Flight Altitudes Of Chick-Rearing Rhinoceros Auklets Cerorhinca Monocerata Measured By Gps Logger, Jumpei Okado, Yutaka Watanuki
Flight Altitudes Of Chick-Rearing Rhinoceros Auklets Cerorhinca Monocerata Measured By Gps Logger, Jumpei Okado, Yutaka Watanuki
Marine Ornithology
Alcids generally fly at low altitudes (below 5 m) over the sea but may occasionally fly higher in certain areas, which may put them at risk of collision with turbine blades in offshore wind farms. We used GPS loggers to investigate the location and altitude of flying Rhinoceros Auklets Cerorhinca monocerata. They typically flew at low altitudes averaging < 1 m but flew higher (> 20 m) when returning the last 5–10 km to their colony, which was located at an elevation of 120–130 m above sea level. Thus, the region over which Rhinoceros Auklets fly highest may vary, depending on the location and elevation of their …
Breeding Microhabitat Patterns Among Sympatric Tropical Larids, Antonio Garcia-Quintas, Dennis Denis, Christophe Barbraud, Sophie Lanco Bertrand
Breeding Microhabitat Patterns Among Sympatric Tropical Larids, Antonio Garcia-Quintas, Dennis Denis, Christophe Barbraud, Sophie Lanco Bertrand
Marine Ornithology
The selection of breeding microhabitat (nesting sites) affects successful reproduction in seabirds, yet the process of nesting-site selection in sympatric tropical species remains poorly known. During the 2021 breeding season, we assessed nesting-site selection among five larid species at three cays of Cuba and quantified explanatory variables. Random forest classification models were used to assess which landscape features among eight variables best explained site selection by each species. Patterns were clear for most species, especially the highly gregarious Roseate Tern Sterna dougallii, Royal Tern Thalasseus maximus, and Sandwich Tern T. sandvicensis. Patterns were consistent among the study cays. Dominant plant …
Sighting Of A Beck's Petrel Pseudobulweria Becki And A Vanuatu Petrel Pterodroma [Cervicalis] Occulta In Remote Oceania, And The Process Of Identification, Robert L. Flood, Kirk Zufelt
Sighting Of A Beck's Petrel Pseudobulweria Becki And A Vanuatu Petrel Pterodroma [Cervicalis] Occulta In Remote Oceania, And The Process Of Identification, Robert L. Flood, Kirk Zufelt
Marine Ornithology
This note reports observations of a presumed Beck’s Petrel Pseudobulweria becki and a Vanuatu Petrel Pterodroma [cervicalis] occulta in April 2022, in the low latitudes of the North Pacific, north of Kiritimati, Republic of Kiribati. The sightings are significant because the ranges of both taxa are barely known and their conservation classifications are concerning. We explain the circumstances of each sighting and the process of identification, reflecting upon current identification criteria and our studies of Beck’s Petrel and Vanuatu Petrel at their breeding grounds. Discussion is illustrated with photographs of each bird and its cryptic confusion counterpart—the larger Tahiti Petrel …
Increasing Use Of Artificial Nest Chambers By Seasonally Segregated Populations Of Band-Rumped Storm Petrels Hydrobates Castro At St Helena, South Atlantic Ocean, Annalea Beard, Robert J. Thomas, Elizabeth Clingham, Leeann Henry, Renata Medeiros, Steffen Oppel, Alison Small, Frank Hailer
Increasing Use Of Artificial Nest Chambers By Seasonally Segregated Populations Of Band-Rumped Storm Petrels Hydrobates Castro At St Helena, South Atlantic Ocean, Annalea Beard, Robert J. Thomas, Elizabeth Clingham, Leeann Henry, Renata Medeiros, Steffen Oppel, Alison Small, Frank Hailer
Marine Ornithology
Artificial nest chambers have become a common management tool for monitoring nocturnal burrow-nesting seabirds, although their utility varies among species and locations. The widespread Band-rumped Storm Petrel Hydrobates castro species complex potentially harbours a cryptic species endemic to the South Atlantic. Here we evaluate the installation of artificial nest chambers as a tool for long-term conservation and monitoring of this species, which breeds in two distinct seasons on St Helena. Based on six years of observational data, we analysed factors affecting occupancy, mate and chamber fidelity, and reproductive success to optimise nest chamber installation and to enhance future management. Occupancy …
Demographics And Gross Pathology Of Scoters And Scaups Killed By The Cosco Busan Oil Spill In California, Jessie Beck, Ryan D. Carle, Hannahrose Nevins, Susan E.W. De La Cruz, Erica Donnelly-Greenan
Demographics And Gross Pathology Of Scoters And Scaups Killed By The Cosco Busan Oil Spill In California, Jessie Beck, Ryan D. Carle, Hannahrose Nevins, Susan E.W. De La Cruz, Erica Donnelly-Greenan
Marine Ornithology
Unusual wildlife mortality events provide a unique opportunity to collect information on demographics, disease, and body condition in affected wildlife, which may be useful for informing oil spill damage assessments and future spill responses. In November 2007, the Cosco Busan Oil Spill occurred in San Francisco Bay, California, a globally important wintering area for waterfowl. The spill resulted in the mortality of scoters Melanitta spp. and scaups Aythya spp., species that have declined significantly over recent decades. We examined the demography (sex and age ratios) and prevalence of grossly apparent disease (acanthocephalan parasite infection and mycotic disease) in 288 Surf …
Apparent Survival Among Adult Leach's Storm Petrels Hydrobates Leucorhous On A Colony Managed For Predators In Nova Scotia, Canada, Sarah E. Gutowsky, Gregory J. Robertson, Anna M. Calvert, David A. Fifield, Robert A. Ronconi, Jennifer C. Rock
Apparent Survival Among Adult Leach's Storm Petrels Hydrobates Leucorhous On A Colony Managed For Predators In Nova Scotia, Canada, Sarah E. Gutowsky, Gregory J. Robertson, Anna M. Calvert, David A. Fifield, Robert A. Ronconi, Jennifer C. Rock
Marine Ornithology
Population declines of Leach’s Storm Petrels Hydrobates leucorhous in the western Atlantic have both led to the species’ recent assessment as Threatened in Canada and contributed to a Vulnerable designation by the IUCN. Limited information suggests low adult survival rates are an important contributing factor. Off eastern Nova Scotia, Canada, Country Island is managed for avian predators and mustelids to protect nesting endangered Roseate Terns Sterna dougallii. The island also hosts a colony of Leach’s Storm Petrels. In 2016, a capture-mark recapture program was initiated for storm petrels, from which we estimated apparent survival and recapture probabilities for 571 breeding …
Extra-Marine Occurrence Of The Magnificent Frigatebird Fregata Magnificens In The Metropolitan Region Of São Paulo, Southeast Brazil, Fabio Schunck, Fábio Toledo Das Dores, Natália Dantas Paes, Marcos Antônio Melo, Bianca Matinata, Marcelo Bokermann, Ingo Grantsau
Extra-Marine Occurrence Of The Magnificent Frigatebird Fregata Magnificens In The Metropolitan Region Of São Paulo, Southeast Brazil, Fabio Schunck, Fábio Toledo Das Dores, Natália Dantas Paes, Marcos Antônio Melo, Bianca Matinata, Marcelo Bokermann, Ingo Grantsau
Marine Ornithology
The Magnificent Frigatebird Fregata magnificens (MAFR) has the largest area of occurrence of any species in the Fregatidae family, with a large nesting colony in Southeast Brazil. However, studies with birds that occur on the coastal plain and in other areas of the continent are lacking. We organized information obtained in the field, from the literature, and from online ornithological platforms, and we evaluated the occurrence of MAFR on the plateau of the Metropolitan Region of São Paulo (MRSP), the largest urban area in South America. A total of 31 records were obtained dating back to 1960. Twelve of the …
Disparate Decadal Trends In Kaua'i Seabird Populations: Possible Effects Of Resource Competition And Anthropogenic Impacts, David Ainley, Stephanie Schneider, Gregory Spencer
Disparate Decadal Trends In Kaua'i Seabird Populations: Possible Effects Of Resource Competition And Anthropogenic Impacts, David Ainley, Stephanie Schneider, Gregory Spencer
Marine Ornithology
Population trends of seabirds nesting on Kaua‘i in the Hawaiian Islands, USA, were assessed across four decades using data from the Save Our Shearwaters (SOS) program. Started in 1979, the SOS database was intended to track the incidence of attraction of Kaua‘i’s seabirds to artificial lights, but recovery rate data also became useful to index population trends. These data documented precipitous declines of Newell’s Shearwater Puffinus newelli through 2017. Here we expand on those efforts by including four additional species and consider data to 2018. All five species exhibited increasing trends during SOS’s first decade, coincidental with increasing human population, …
Breeding Of Bridled Tern Onychoprion Anaethetus On A Shipwreck In Bahregan Bay, Persian Gulf: A Case Report, Hamed Ghanaatian, Alireza Safahieh, Keivan Kabiri, Ahmad Savari, Mohamad Reza Mohamadzadeh, Khosrow Darvishi
Breeding Of Bridled Tern Onychoprion Anaethetus On A Shipwreck In Bahregan Bay, Persian Gulf: A Case Report, Hamed Ghanaatian, Alireza Safahieh, Keivan Kabiri, Ahmad Savari, Mohamad Reza Mohamadzadeh, Khosrow Darvishi
Marine Ornithology
There are several tern species that breed in Iran during summer. Usually they nest on safe and uninhabited islands of the Persian Gulf. Here, we report an unusual occurrence at the Iran-Reshadat shipwreck ~10 km from Imam Hassan port in Bahregan Bay, Bushehr Province. At this site, Bridled Terns had laid eggs on the sunken ship upon three deck pillars that reached ~8 m above high water. Despite fishing boats anchoring around the sunken ship and even tying to the pillars, the terns appeared to feel safe and continued to nest at this location.
Underwater Kleptoparasitism On A Human Diver By A Galapagos Flightless Cormorant Nannopterum Harrisi, Juan Manuel Álava-Jurado, Michael J. Kingsford, Margarita Brandt, Eric Dorfman
Underwater Kleptoparasitism On A Human Diver By A Galapagos Flightless Cormorant Nannopterum Harrisi, Juan Manuel Álava-Jurado, Michael J. Kingsford, Margarita Brandt, Eric Dorfman
Marine Ornithology
We describe underwater kleptoparasitism on a human diver by a Galapagos Flightless Cormorant Nannopterum harrisi, a behavior that has not been previously described for this species.
When Ornithology Meets Ethnology And Archeology: The Birds Of The Bird-Cult At Rapa Nui (Easter Island) And Their Demise, Manuel Marín
When Ornithology Meets Ethnology And Archeology: The Birds Of The Bird-Cult At Rapa Nui (Easter Island) And Their Demise, Manuel Marín
Marine Ornithology
The disappearance of the bird species involved in the bird-cult of Rapa Nui (Easter Island) was examined. The cult was a contest in which the winner gathered the first seabird egg of the year from a near-shore islet, allowing the winner to become the Tangata Manu, or Birdman. This title provided a heightened status, bringing social and economic benefits and a way of being closer to their gods. Three seabird species were involved in the bird-cult: Great Frigatebird Fregata minor, Sooty Tern Onychoprion fuscatus, and the Spectacled Tern Onychoprion lunatus, none of which currently breed in the area. Rock art …
European-Asian Population Of Great White Pelican Pelecanus Onocrotalus, From Breeding To Wintering: A Review, Khashayar Mahdiany Bora, Ghazaleh Mirbazel, Mohammadjavad Tajadod
European-Asian Population Of Great White Pelican Pelecanus Onocrotalus, From Breeding To Wintering: A Review, Khashayar Mahdiany Bora, Ghazaleh Mirbazel, Mohammadjavad Tajadod
Marine Ornithology
Great White Pelican Pelecanus onocrotalus (hereafter: GWP) is an IUCN Near Threatened species having two distinct populations. The first population is a migratory European-Asian population that has an extensive Palearctic breeding range from eastern Europe to western Asia and has exhibited a sharp decline during the last couple of decades. The second population, on the other hand, is a sedentary but stable population that breeds mostly in Kenya, South Africa, and Namibia. Herein, we review the literature available on the occurrence patterns of these populations. Many studies on the migratory population show that conditions during winter have substantial impacts on …
The Potential Of Ecologists To Enhance Our Understanding Of Seabird Health, Melanie R. Wells, Annie Philips, Mary-Anne Lea, Scott Carver
The Potential Of Ecologists To Enhance Our Understanding Of Seabird Health, Melanie R. Wells, Annie Philips, Mary-Anne Lea, Scott Carver
Marine Ornithology
Ecologists play a pivotal role in the detection and investigation of population changes in seabirds and by doing so have significant potential to contribute to enhancing knowledge of seabird health. This review highlights key examples in the literature where ecologists have employed diligent passive health surveillance and/or undertaken targeted investigations of seabirds, strategies that have augmented our knowledge of seabird health at individual and population levels. Within the context of One Health, an integrated approach to perceiving and managing health, this review amalgamates veterinarian and ecology disciplines by summarising auxiliary metrics of clinical health that may be considered for incorporation …
Observation Of A Leucistic Brown Noddy Anous Stolidus In Tetiaroa, French Polynesia, Simon Ducatez, Jayna L. Devore
Observation Of A Leucistic Brown Noddy Anous Stolidus In Tetiaroa, French Polynesia, Simon Ducatez, Jayna L. Devore
Marine Ornithology
We observed a leucistic Brown Noddy Anous stolidus on the atoll of Tetiaroa in French Polynesia. This individual was mostly light grey, similar in coloration to a Blue Noddy Anous ceruleus. To the best of our knowledge, this is the first report of a Brown Noddy with such plumage. Brown Noddies and White Terns Gygis alba were particularly aggressive towards the aberrantly colored Brown Noddy.
Laying Sequence And Oceanographic Factors Affect Egg Size In Scripps's Murrelets Synthliboramphus Scrippsi At Santa Barbara Island, Marcela I. Todd Zaragoza, Amelia J. Duvall, Jim A. Howard, David M. Mazurkiewicz, Sarah J. Converse
Laying Sequence And Oceanographic Factors Affect Egg Size In Scripps's Murrelets Synthliboramphus Scrippsi At Santa Barbara Island, Marcela I. Todd Zaragoza, Amelia J. Duvall, Jim A. Howard, David M. Mazurkiewicz, Sarah J. Converse
Marine Ornithology
Egg size is an important avian life history parameter, with larger eggs indicating greater investment of resources in the chick. Prey availability can affect such investment. We investigated the effects of oceanographic conditions and laying sequence on Scripps’s Murrelet Synthliboramphus scrippsi egg size at Santa Barbara Island, California during 2009–2017. We evaluated oceanographic covariates characterizing marine productivity for their effect on egg size, including large-scale oceanographic indices such as the Pacific Decadal Oscillation (PDO) index, Oceanic Niño Index (ONI), and North Pacific Gyre Oscillation (NPGO) index. We also evaluated a larval anchovy catch-per-unit-effort (ANCHL) index and the Biologically Effective Upwelling …
Masthead, Pacific Seabird Group
Contents, Pacific Seabird Group
Front Cover, Pacific Seabird Group
Inside Front Cover, Pacific Seabird Group
Author Instructions, Pacific Seabird Group
Reviews: Immigrant Gone To Heaven: Dutch Polder To Canada's Frontier (Vermeer, K.); New(Ish) And Interesting Books; The Ocean's Whistleblower: The Remarkable Life And Work Of Daniel Pauly (Gremillet, D.); New Zealand Birds: A Natural History (Wilson, K.-J.), Alan E. Burger, Eric L. Wagner, Laura E. Koehn, Lloyd S. Davis
Reviews: Immigrant Gone To Heaven: Dutch Polder To Canada's Frontier (Vermeer, K.); New(Ish) And Interesting Books; The Ocean's Whistleblower: The Remarkable Life And Work Of Daniel Pauly (Gremillet, D.); New Zealand Birds: A Natural History (Wilson, K.-J.), Alan E. Burger, Eric L. Wagner, Laura E. Koehn, Lloyd S. Davis
Marine Ornithology
No abstract provided.
In Memoriam: William (Bill) R.P. Bourne, 1930-2021, Pat Baird
In Memoriam: William (Bill) R.P. Bourne, 1930-2021, Pat Baird
Marine Ornithology
This tribute is a compilation of obituaries by Michael Harris and Mark Tasker, Craig Harrison's speech at the ceremony for Bill's Pacific Seabird Group (PSG) Lifetime Achievement Award in 1997, Michael Harris's eulogy at Bill's memorial service in Scotland, and emails I have received from PSG members, as well as from my memories of a very long friendship with Bill and his wife Sheila spanning over 30 years.