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Specialty Grand Challenge: Existing Issues And Emerging Frontiers In Renal Endocrinology, A. T. M. Emdadul Haque, Mohammed S. Razzaque Jul 2025

Specialty Grand Challenge: Existing Issues And Emerging Frontiers In Renal Endocrinology, A. T. M. Emdadul Haque, Mohammed S. Razzaque

School of Medicine Publications

We are currently in an exciting time to advance the field of renal endocrinology. There has never been a more favorable time to study the molecular and cellular mechanisms underlying renal hormone functions in physiology, pharmacology, and pathophysiology. The availability of advanced research tools provides unique opportunities to dissect the complex regulatory roles of renal hormones. The kidneys are vital organs in the human body; each one is composed of approximately one million functional nephrons. Understanding the precise roles and regulation of kidney-derived hormones and hormones that exert endocrine effects on the kidneys will help in preventing or delaying various …

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Religious Communication In An Urban Society Jul 2025

Religious Communication In An Urban Society

Communication Research Trends

Whatever happened to the churches? To whom are they speaking these day?

Christianity and other major religious traditions developed their symbolic language and their patterns of communication in a pre-industrial world and in the largely oral culture of rural villages. Christianity did adapt rather remarkably to the possibilities of the print media. But now the urban pattern of life, the technical-scientific mode of thought and the electronic media are· influencing radically the pattern of human life.

Sociologists of religion conclude that religious aspirations are as strong as ever, but that people increasingly do not find the expression of their religion …

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Use Of An Honest Signal By Red-Footed Boobies Sula Sula In Response To Kleptoparasitism By Great Frigatebirds Fregata Minor, Lin Chao Jul 2025

Use Of An Honest Signal By Red-Footed Boobies Sula Sula In Response To Kleptoparasitism By Great Frigatebirds Fregata Minor, Lin Chao

Marine Ornithology

On Genovesa Island (00.3°N, 089.9°W) in the Galápagos Islands, Ecuador, Great Frigatebirds Fregata minor kleptoparasitize (i.e., steal food from) Red-footed Boobies Sula sula. In five of eight cases that I observed, the frigatebirds harassed the boobies until the latter regurgitated their forage, which the frigatebirds consumed. In three cases, the booby responded with a honk-like call and the frigatebirds stopped harassing. I propose that the honk is an “honest signal” by a booby having little food to divulge. Boobies loaded with forage do not honk because the call could trigger regurgitation. Thus, frigatebirds harass with escalation only non-honking boobies. The …

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First U.S. Atlantic Record Of Nazca Booby Sula Granti, With Implications For Vagrancy By Pacific Seabirds Into The Gulf Of Mexico, Kate E. Sutherland, Nicholas J. Metheny, J. Christopher Haney Jul 2025

First U.S. Atlantic Record Of Nazca Booby Sula Granti, With Implications For Vagrancy By Pacific Seabirds Into The Gulf Of Mexico, Kate E. Sutherland, Nicholas J. Metheny, J. Christopher Haney

Marine Ornithology

An adult Nazca Booby Sula granti was photographed in the western Gulf of Mexico on 03 August 2024 during a survey of marine birds and mammals over waters east of South Padre Island, Texas, USA (26.384ºN, 096.176ºW). This is the first report of S. granti in US waters of the Gulf of Mexico; previous eBird reports indicate occasional presence in Caribbean waters off Costa Rica (2018) and Colombia (2020). As many as 20% of all marine and waterbird species occurring in the Gulf of Mexico have core ranges in the Pacific Ocean or its continental margins. Dispersal by Pacific birds …

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Nape Coloration Varies With Sex, Not Age, Among Great Shearwaters Ardenna Gravis, Ewan D. Wakefield, Anna R. Robuck, Kevin D. Powers, Robert A. Ronconi, Peter G. Ryan, David N. Wiley Jul 2025

Nape Coloration Varies With Sex, Not Age, Among Great Shearwaters Ardenna Gravis, Ewan D. Wakefield, Anna R. Robuck, Kevin D. Powers, Robert A. Ronconi, Peter G. Ryan, David N. Wiley

Marine Ornithology

Most petrels (family Procellariidae) exhibit little or no obvious variation in plumage with age or sex, either because plumage performs no sexual function or does so in a way poorly perceptible to humans. This limits the inferences that can be made from visual observations of petrels at sea. However, it has been suggested that nape coloration of Great Shearwaters Ardenna gravis whitens with age. Here we test this supposition using observations of known-age-class individuals. We necropsied birds bycaught around Gough Island, a major breeding colony in the South Atlantic Ocean, and in Massachusetts Bay, a wintering area off the northeastern …

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A Petrel Breeding Diversity Hotspot: Raivavae Island (Austral Islands, French Polynesia), With A Need For Conservation Action, Vincent Bretagnolle, Yves David, Thomas Ghestemme, Jean-François Butaud, Tehani Withers, Hadoram Shirihai, Jean-Claude Thibault Jul 2025

A Petrel Breeding Diversity Hotspot: Raivavae Island (Austral Islands, French Polynesia), With A Need For Conservation Action, Vincent Bretagnolle, Yves David, Thomas Ghestemme, Jean-François Butaud, Tehani Withers, Hadoram Shirihai, Jean-Claude Thibault

Marine Ornithology

Raivavae is a small island in the Austral Islands of French Polynesia that is surrounded by a lagoon with 28 islets. Its marine avifauna is one of the least known and least studied in French Polynesia. Overall, seabird surveys in the various Austral Islands have been extremely sparse. This study addresses this need, using both historical and recent findings. The results show high species richness, with 10 breeding procellarid species, though none are numerous. We also update the knowledge on breeding petrels from other Austral Islands (except Rapa) and discuss the consequences of these findings in terms of their conservation …

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Spatial And Temporal Variation Of Beached Birds In Northern Argentine Patagonia, Victoria Magdalena Pizá, Patricio Javier Pereyra, Juan Pablo Seco Pon Jul 2025

Spatial And Temporal Variation Of Beached Birds In Northern Argentine Patagonia, Victoria Magdalena Pizá, Patricio Javier Pereyra, Juan Pablo Seco Pon

Marine Ornithology

Beached birds on marine coastal beaches, along with other megafauna, are a valuable source of biological information, offering insights into species occurrence and factors that negatively affect their populations. The main objective of this study was to evaluate the spatial and temporal variation, and species composition, of coastal and marine birds found on sandy beaches in the Bahía de San Antonio Protected Natural Area (Río Negro Province, Argentina), and to relate resulting species abundance and richness to oceanographic and environmental variables. A biweekly survey was carried out over two years (2020-2022), during which 672 beached birds were recorded. The overall …

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Thick-Billed Murres Uria Lomvia At Cape Parry, Northwest Territories: Core-Use Areas, Morphometrics And Chick Diets, Rosana Paredes, Stephen, J. Insley, Sebastian Luque, Piia Kortsalo Jul 2025

Thick-Billed Murres Uria Lomvia At Cape Parry, Northwest Territories: Core-Use Areas, Morphometrics And Chick Diets, Rosana Paredes, Stephen, J. Insley, Sebastian Luque, Piia Kortsalo

Marine Ornithology

Cape Parry is home to the only colony of Thick-billed Murres Uria lomvia in the western Canadian Arctic, but ecological information for this small, isolated population is lacking. To address this information gap, we investigated the spatial distribution, diving behaviour, diet, and morphometrics of male and female Cape Parry Thick-billed Murres during the breeding season. We tracked 23 chick-rearing adults (seven females and 16 males) using Global Positioning System (GPS) tags with depth sensors (2021) and collected chick diet data (2021, 2022) using observations and photos. Cape Parry murres foraged relatively close to the colony (4.5 ± 3.3 km) and …

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Hybridization In Terns: A Review, Jente Ottenburghs, Ian C.T. Nisbet Jul 2025

Hybridization In Terns: A Review, Jente Ottenburghs, Ian C.T. Nisbet

Marine Ornithology

Hybridization—the interbreeding of different species—is a relatively common phenomenon in birds, but its study is biased towards certain taxa. In this review, we focus on a bird group that has received less attention: terns (Laridae, Sterninae). Based on an extensive literature search, we found records for 16 hybrids between tern species, with varying levels of supporting evidence: ten cases had strong support, one had medium support, one had low support, and four cases were deemed unreliable (two were refuted and two could not be evaluated). The strongly supported hybrid records involved 14 different tern species (out of 41 species, 34%). …

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Seagrass And Mangroves As Water-Associated Bird Habitat In The Southern Red Sea Coasts Of Saudi Arabia, Jeff Bogart R. Abrogueña, Iwao Tanita, Anthony M. Doyle, Romana Roje-Busatto, Jean Rose H. Maquirang, Seerangan Manokaran, Khalid Imam, Thamer Al-Johani, Sau Pinn Woo Jul 2025

Seagrass And Mangroves As Water-Associated Bird Habitat In The Southern Red Sea Coasts Of Saudi Arabia, Jeff Bogart R. Abrogueña, Iwao Tanita, Anthony M. Doyle, Romana Roje-Busatto, Jean Rose H. Maquirang, Seerangan Manokaran, Khalid Imam, Thamer Al-Johani, Sau Pinn Woo

Marine Ornithology

Studies on water-associated bird communities within seagrass and mangrove habitats, especially in arid environments, are limited. Here, we studied a pristine mangrove forest with associated seagrass meadows in the Jazan City for Primary and Downstream Industries (JCPDI) on the southern Red Sea coast of Saudi Arabia. Our objectives were to (1) determine the differences in the diversity and distribution of water-associated bird communities between three sampling stations—S1 (a mixture of mangroves and seagrass beds), S2 (an open coast adjacent to mangroves), and S3 (an open coast without vegetation)—and across three seasons (March for spring, July for summer, and November for …

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Wire Ingestion By A Red-Billed Tropicbird Phaethon Aethereus Chick On San Pedro Mártir Island, Mexico, Alberto Piña-Ortiz, Vladislav Marcuk, Salvador Gómez-Hernández, José Alfredo Castillo-Guerrero, Petra Quillfeldt Jul 2025

Wire Ingestion By A Red-Billed Tropicbird Phaethon Aethereus Chick On San Pedro Mártir Island, Mexico, Alberto Piña-Ortiz, Vladislav Marcuk, Salvador Gómez-Hernández, José Alfredo Castillo-Guerrero, Petra Quillfeldt

Marine Ornithology

We report the ingestion of wire by a Red-billed Tropicbird Phaethon aethereus chick at San Pedro Mártir Island, Gulf of California, Mexico. A scat sample collected from a four- to five-week-old chick contained a copper wire ~5.0 mm in length. Biologging revealed the previous foraging trips by one of the parents, and we ascertained the diet of birds in this colony through a molecular approach. From these data, we suggest why this individual was fed wire.

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The Owl Gull: Exclusively Nocturnal Foraging By The Swallow-Tailed Gull Creagrus Furcatus In Galápagos, Sebastian M. Cruz, Luke R. Halpin, Carolina Proaño, David J. Anderson, Martin Wikelski Jul 2025

The Owl Gull: Exclusively Nocturnal Foraging By The Swallow-Tailed Gull Creagrus Furcatus In Galápagos, Sebastian M. Cruz, Luke R. Halpin, Carolina Proaño, David J. Anderson, Martin Wikelski

Marine Ornithology

Colony-based observations indicate that Swallow-tailed Gulls Creagrus furcatus go to sea only at night. Here, we use GPS tracking technology to reveal the species’ exclusively nocturnal foraging behavior at four colonies in the Galápagos Islands. All nocturnal trips proved to be foraging effort in pelagic waters 19–103 km from nests during breeding. While at sea, individuals spent approximately one-quarter of their time commuting, with half of the time dedicated to area-restricted search behavior. Three years of data from one colony indicate spatial fidelity to a general foraging area. Our research directly confirms that Swallow-tailed Gulls are the only obligate nocturnal …

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Comparison Of Offspring Growth Models In Atlantic Puffins Fratercula Arctica , Katja H. Kochvar, Raul Zabala Belenguer, Pierre-Paul Bitton Jul 2025

Comparison Of Offspring Growth Models In Atlantic Puffins Fratercula Arctica , Katja H. Kochvar, Raul Zabala Belenguer, Pierre-Paul Bitton

Marine Ornithology

Growth of morphological traits in the offspring of many seabirds, including Atlantic Puffins Fratercula arctica, has typically been characterized by linear models despite displaying nonlinear patterns. We assessed the fit of six typical avian growth models to measurements of puffling mass, wing length, and tenth primary length. Across all three biometrics, the first- and second-best performing models were nonlinear (i.e., quadratic, logistic, extreme value function); these models were then used to generate separate growth curves for individual pufflings and extract easily interpretable and comparable parameter estimates. We recommend the reported models in future studies incorporating metrics of puffling growth and …

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Artificial Brood Parasite Technique For Rearing Abandoned Eggs Of The Endangered Little Tern Sternula Albifrons, Masaharu Hayakawa Jul 2025

Artificial Brood Parasite Technique For Rearing Abandoned Eggs Of The Endangered Little Tern Sternula Albifrons, Masaharu Hayakawa

Marine Ornithology

The Little Tern Sternula albifrons is a ground-nesting species classified as Endangered on the Japan Ministry of the Environment's Red Data List. It may abandon its eggs owing to disturbances, a factor having a negative impact on its population trends. Successful artificial nurturing of these eggs could aid in the recovery of the species. To address this issue, I developed a ‘brood parasite' technique. The process involves taking abandoned eggs from a nest, incubating them in a facility until one day before hatching, and then covertly placing the protected eggs into other nests within the colony. By these means, foster …

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Breeding Season Movements Of Aleutian Terns Onychoprion Aleuticus: Implications For Population Assessment And Monitoring, Kelly Nesvacil, Grey W. Pendleton, John P. Skinner, Susan Oehlers, Jeff Mondragon, Donald E. Lyons Jul 2025

Breeding Season Movements Of Aleutian Terns Onychoprion Aleuticus: Implications For Population Assessment And Monitoring, Kelly Nesvacil, Grey W. Pendleton, John P. Skinner, Susan Oehlers, Jeff Mondragon, Donald E. Lyons

Marine Ornithology

In 2017 and 2018, satellite transmitters were deployed (n2017 = 13, n2018 = 14) on Aleutian Terns Onychoprion aleuticus in two areas of Alaska, USA, to investigate breeding season movements and temporal patterns of colony activity. The effort was intended to aid in the development of a large-scale population-assessment framework. Across the two years, we observed dispersal to seven confirmed or potential (putative) colonies, none of which were previously documented, ranging in distance from 0.4 to 64.2 km from tag deployment sites. Although most terns did not associate with any known colonies during the breeding season, several individuals from the …

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Modeling Breeding Habitat Preferences Of Tahiti Petrel Pseudobulweria Rostrata On Ta‘Ū, American Samoa, A. J. Titmus, C. A. Lepczyk Jul 2025

Modeling Breeding Habitat Preferences Of Tahiti Petrel Pseudobulweria Rostrata On Ta‘Ū, American Samoa, A. J. Titmus, C. A. Lepczyk

Marine Ornithology

Understanding the prevalence and use of breeding habitat of seabird species is important for evaluating appropriate conservation and management strategies. Seabirds are one taxonomic group for which we have relatively few species distribution studies, particularly on remote islands. To address this limitation, the goals of this study were to (1) build and use a species distribution model to identify which differences in habitat structure, physical characteristics, and environmental conditions affect Tahiti Petrel Pseudobulweria rostrata nesting presence on the island of Ta‘ū, American Samoa; and (2) evaluate how important nesting habitat characteristics can identify the fine-scale extent and location of suitable …

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Technological Evolution Generates New Answers And New Ways Forward: A Progress Report From The First Decade At The Karlsö Auk Lab, Jonas Hentati-Sundberg, Per-Arvid Berglund, Agnes B. Olin, Aron Hejdström, Henrik Österblom, Astrid A. Carlsen, Quentin Queiros, Olof Olsson Jul 2025

Technological Evolution Generates New Answers And New Ways Forward: A Progress Report From The First Decade At The Karlsö Auk Lab, Jonas Hentati-Sundberg, Per-Arvid Berglund, Agnes B. Olin, Aron Hejdström, Henrik Österblom, Astrid A. Carlsen, Quentin Queiros, Olof Olsson

Marine Ornithology

In 2008, we built an artificial nesting construction for Common Murres Uria aalge, the Karlsö Auk Lab, on an island in the Baltic Sea (Hentati-Sundberg et al., 2012). The aim was to create an environment in which the birds could be readily monitored and accessed, and technological equipment easily installed. In this current paper, we report on murre recruitment to the Auk Lab over the first decade, assess the performance of the birds living on the lab compared to natural cliff ledges, and revisit the original research questions. We conclude that the tremendous developments in sensor technology (video surveillance, automated …

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Author Instructions, Pacific Seabird Group Jul 2025

Author Instructions, Pacific Seabird Group

Marine Ornithology

No abstract provided.

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‘Floating Populations’ Of Seabirds: The Bane Of Demographic Modelers And Managers, David G. Ainley, George J. Divoky, Pat Baird, Gregory C. Spencer Jul 2025

‘Floating Populations’ Of Seabirds: The Bane Of Demographic Modelers And Managers, David G. Ainley, George J. Divoky, Pat Baird, Gregory C. Spencer

Marine Ornithology

’Floating’ portions of seabird populations (mature but non-breeding individuals) are generally ignored in seabird research and management despite frequent evidence of their existence, especially in cavity-nesting species for whom nest habitat is often limiting. Here we demonstrate, using a few among an appreciable number of cases, that often more adults contribute to regional populations than colony-based censuses reveal, and that these birds are able to breed but do not. Once given the chance through the creation of nesting habitat, either by natural or human-caused processes, these populations reveal themselves by occupying the newly created habitats to become breeders. We include …

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Have Rodents Impacted The Breeding And Distribution Of Black Noddy Anous Minutus On Lord Howe Island?, Nicholas Carlile, Lisa O’Neill, Terence O’Dwyer Jul 2025

Have Rodents Impacted The Breeding And Distribution Of Black Noddy Anous Minutus On Lord Howe Island?, Nicholas Carlile, Lisa O’Neill, Terence O’Dwyer

Marine Ornithology

Rodents are well known to impact nesting seabirds. However, not all seabird species are equally susceptible to rodents due to variations in size, nest-site selection, or nesting behaviour. The Black Noddy Anous minutus, a common tropical, tree-nesting species, began colonisation of North Bay on Australia’s Lord Howe Island in 1989, 70 years after the establishment of Black Rats Rattus rattus. In 2014, when the breeding colony consisted of 560 pairs, we commenced a pilot study to assess impacts of rodents. Ten motion-triggered cameras monitoring 12 nests showed no rodent presence on any branches within view; 11 of those nesting attempts …

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Non-Significant Effect Of El Niño On The Nest Occupancy And Breeding Success Of Markham’S Storm Petrel Hydrobates Markhami, Fernando Medrano, Benjamín Gallardo, Pablo Gutiérrez, Ronny Peredo, Giannira Álvarez, Nelson Contardo, Rodrigo Silva, Ivo Tejeda Jul 2025

Non-Significant Effect Of El Niño On The Nest Occupancy And Breeding Success Of Markham’S Storm Petrel Hydrobates Markhami, Fernando Medrano, Benjamín Gallardo, Pablo Gutiérrez, Ronny Peredo, Giannira Álvarez, Nelson Contardo, Rodrigo Silva, Ivo Tejeda

Marine Ornithology

The impact of the El Niño varies across seabirds, usually altering the distribution and causing population declines. Understanding El Niño’s effects is thus critical for conservation. We monitored 296 nests of the little-known Hydrobates markhami during three seasons (2021–2023). We tested annual differences in individual breeding success and nest occupancy against the Southern Oscillation Index and found no effect. Our findings can be explained by the storm petrels’ diet, which is more closely related to primary production than is the prey of other seabirds. Alternatively, individuals may compensate for the effects of El Niño by changing foraging strategies.

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No Evidence For High Pathogenicity Avian Influenza In Waved Albatross Phoebastria Irrorata, Gustavo Jiménez-Uzcátegui, Alberto Vélez, Patricio Vega, Verónica Buendia, Verónica Montenegro-Benalcázar, Christian Sevilla, Marilyn Cruz Jul 2025

No Evidence For High Pathogenicity Avian Influenza In Waved Albatross Phoebastria Irrorata, Gustavo Jiménez-Uzcátegui, Alberto Vélez, Patricio Vega, Verónica Buendia, Verónica Montenegro-Benalcázar, Christian Sevilla, Marilyn Cruz

Marine Ornithology

Highly pathogenic avian influenza (HPAI) is caused by the Alphainfluenzavirus influenzae species (type A, subtype H5N1), which has been detected in mammals (including humans) and marine birds in the Americas, including the Galápagos Islands. The Waved Albatross Phoebastria irrorata is a marine endemic species of Ecuador. Most of its breeding population nests on Española Island in the Galápagos Archipelago, and it forages at sea in the eastern South Pacific. This marine bird shares its feeding areas with the Peruvian Pelican Pelecanus thagus, Peruvian Booby Sula variegata, Guanay Cormorant Leucocarbo bougainvillii, Humboldt Penguin Spheniscus humboldti, Sanderling Calidris alba, Belcher’s Gull Larus …

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Assessing The Short- And Long-Term Response Of Gulls To Non-Lethal Hazing On An Offshore Island, Pete Warzybok, Nadav Nur, Russell W. Bradley, Dan Grout, Gerard J. Mcchesney Jul 2025

Assessing The Short- And Long-Term Response Of Gulls To Non-Lethal Hazing On An Offshore Island, Pete Warzybok, Nadav Nur, Russell W. Bradley, Dan Grout, Gerard J. Mcchesney

Marine Ornithology

Non-lethal bird hazing techniques are commonly used to protect public health and safety, defend crops, and safeguard the birds themselves. Examples of their use include warding them away from airports, landfills, oil spills, and other avian toxic exposure situations. Herein we examine the efficacy of non-lethal hazing tools for minimizing impacts to Gulls Larus spp. prior to a proposed eradication of introduced House Mice Mus musculus at the South Farallon Islands, 30 km offshore of the Central California coast. Methods considered for removing mice include the aerial application of rodenticide, which poses an adverse risk to non-target wildlife, including Western …

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Variation In The Heartbeat Of The White Tern Gygis Alba During Incubation, Antony W. Diamond, Adelheid Studer-Thiersch Jul 2025

Variation In The Heartbeat Of The White Tern Gygis Alba During Incubation, Antony W. Diamond, Adelheid Studer-Thiersch

Marine Ornithology

Rapid global heating is a particular danger to tropical birds already near their thermal maximum. White Terns Gygis alba are important to tourism in the Seychelles Islands, where, in 1974, we took an unexpected opportunity to measure the heart rate of two incubating adults. We found that the birds had higher heart rates at night compared to during the day, and their heart rates increased rapidly when approached by people. Local temperatures have risen considerably since these data were collected nearly 50 years ago and are predicted to rise even further by 2100. Given the importance of White Terns as …

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Updated Distribution And Population Dynamics Of Magellanic Penguin Spheniscus Magellanicus Colonies In The Strait Of Magellan, Chile, Manuel Ochoa-Sánchez, Jorge Acevedo, Claudio Moraga, Katherine Gaete, Pedro Valenzuela, Valeria Souza, Eliana Paola Acuña Gomez Jul 2025

Updated Distribution And Population Dynamics Of Magellanic Penguin Spheniscus Magellanicus Colonies In The Strait Of Magellan, Chile, Manuel Ochoa-Sánchez, Jorge Acevedo, Claudio Moraga, Katherine Gaete, Pedro Valenzuela, Valeria Souza, Eliana Paola Acuña Gomez

Marine Ornithology

The Magellanic Penguin Spheniscus magellanicus exhibits a broad latitudinal distribution in southern South America. However, the locations of many breeding colonies remain poorly known on the Pacific side, particularly in the southernmost region. Here, we provide information for six Magellanic Penguin colonies in the Strait of Magellan and adjacent waters that have been known by the local community for years but were unknown in the scientific literature until now: Rupert Islet, Tuckers Islet 1, Tuckers Islet 2, James Island 1, James Island 2, and Monmouth Island. These locations differ in population size and in vegetation coverage: most colonies are characterized …

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Characterizing Diet Of The Least Tern Sternula Antillarum Using Dna Metabarcoding, Viktoria E. Bogantes, Abigail J. Darrah, Molly Folkerts Caldwell, Amy K. Fellgren, Justine M. Whitaker, Alexis M. Janosik Jul 2025

Characterizing Diet Of The Least Tern Sternula Antillarum Using Dna Metabarcoding, Viktoria E. Bogantes, Abigail J. Darrah, Molly Folkerts Caldwell, Amy K. Fellgren, Justine M. Whitaker, Alexis M. Janosik

Marine Ornithology

A complete picture of diet composition is an essential element to understanding the ecological role of organisms. Moreover, diet studies can serve as an important tool for monitoring species and changes to the food web. One method to provide resolution when studying the diet of avian species is DNA metabarcoding of fecal samples. As such, we used DNA analysis to determine the diet of the Least Tern Sternula antillarum and compare results with diet analysis based on composition of fish dropped within breeding colonies. Comparisons between adult and chick fecal samples were also made across three years and within three …

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Black Oystercatcher Haematopus Bachmani Productivity In California And Oregon And The Effects Of Nest Site And Environmental Covariates, Anna Weinstein, Joseph Liebezeit, Daniel Orr, Ryan D. Carle, Timothy D. Meehan Jul 2025

Black Oystercatcher Haematopus Bachmani Productivity In California And Oregon And The Effects Of Nest Site And Environmental Covariates, Anna Weinstein, Joseph Liebezeit, Daniel Orr, Ryan D. Carle, Timothy D. Meehan

Marine Ornithology

Black Oystercatcher Haematopus bachmani is a species of conservation concern due to its small global population, reliance on somewhat restricted intertidal habitat, and vulnerability to climate change impacts. Concern for this species, along with a lack of demographic information from the southern portion of its range, gave rise to a community science project to monitor pair productivity, nest characteristics, and nest disturbance from 2012 through 2022 across three study regions in Oregon and California. A clear spatial gradient existed in productivity, with relatively low values in the southern region (0.37 fledged young per pair per year, 95% confidence interval [CI] …

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Assessment Of Tufted Puffin Fratercula Cirrhata Diet Using Dna Metabarcoding, Thomas P. Good, Andrew O. Shelton, Abigail H. Wells, Ana Ramón-Laca, Ramon Gallego, Peter J. Hodum, Scott F. Pearson Jul 2025

Assessment Of Tufted Puffin Fratercula Cirrhata Diet Using Dna Metabarcoding, Thomas P. Good, Andrew O. Shelton, Abigail H. Wells, Ana Ramón-Laca, Ramon Gallego, Peter J. Hodum, Scott F. Pearson

Marine Ornithology

Investigating trophic relationships can be critical for understanding relationships between marine predators and their prey. DNA analysis of feces is used increasingly as a non-invasive method to uncover seabird dietary patterns across space and time. Tufted Puffins Fratercula cirrhata are listed as Endangered in the state of Washington (WA), USA, and reduced prey availability is thought to be a key factor in the species’ decline. Recent information on Tufted Puffin diet is lacking, and present opportunities for direct diet observation are limited. We conducted a pilot study to characterize Tufted Puffin diet on Destruction Island, WA, in 2019 using DNA …

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Oviposition Lag In Nazca Boobies Sula Granti, Leslie D. Clifford, David J. Anderson Jul 2025

Oviposition Lag In Nazca Boobies Sula Granti, Leslie D. Clifford, David J. Anderson

Marine Ornithology

Egg formation in well-studied poultry includes rapid yolk deposition (RYD), which completes the formation of the ovum, then ovulation and uptake of the ovum by the oviduct to complete egg formation. Roughly a day passes between the end of RYD and oviposition in these species. In other species, notably seabirds, egg formation is paused at the end of RYD for days or even more than a week. The phylogenetic coverage of data on this “oviposition lag” is patchy. We present the first estimate of oviposition lag for the Sulidae (4 d) and only the second estimate for the Suliformes.

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The Distribution, Abundance, And Habitat Use Of Wintering Iceland Gulls Larus Glaucoides Thayeri In Northern California And Comparisons With Other Larus Gulls., Scott S. Moorhouse Jul 2025

The Distribution, Abundance, And Habitat Use Of Wintering Iceland Gulls Larus Glaucoides Thayeri In Northern California And Comparisons With Other Larus Gulls., Scott S. Moorhouse

Marine Ornithology

Recent studies have provided significant insights, but relatively limited information is available on many aspects of the ecology and behavior of the Arctic-breeding Iceland Gull Larus glaucoides. In this study, the distribution, abundance, and habitat use of wintering Iceland Gulls Larus glaucoides thayeri in Northern California, USA, were analyzed in 30 habitat types over three winters. A total of 6012 individuals was recorded, contributing 2.3% of the total Larus gulls recorded. The mean number of Iceland Gulls recorded per count was highest in sanitary landfills located in the Inner Coast Range, Central Valley, Inner Coast, and San Francisco Bay Plain …

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