United States

**Abstract:**

Gulls are one of the very few avian taxa to occur on all continents, and many species have adapted remarkably well to living alongside humans in urban environments. Paradoxically, many of these species continue to experience overall population declines, even as urban-nesting populations grow. In this talk, we will present details about several gull species that occupy the Pacific coast of North America: Glaucous-winged (Larus glaucescens), Western (L. occidentalis), Herring (L. argentatus), Mew (L. canus), and Heermann&#39;s (L. heermanni). Drawing on six years of field work across Canada and the US, we will compare and contrast the urban ecologies of these species with those of their declining, non-urban conspecifics. Nest site demographics, as well as colony density, nest fidelity, and reproductive success figures will be presented. We will also discuss several spatial models that we have developed to predict urban-nesting behaviour in these species. As urban-nesting becomes more commonplace, a host of new human-wildlife conflicts can arise, as well as many exciting conservation opportunities. These issues and ideas demand a deeper knowledge of the breeding ecology of urban gulls, and our work represents another step toward this.

**Authors:**

Edward Kroc¹, Louise Blight²

¹University of British Columbia, ²Procellaria Research &amp; Consulting

3rd World Seabird Conference

Urban gulls of the Pacific coast of North America: Balancing wildlife conflict concerns with the protection of urban breeding sites

Welcome Seabirders!  

Welcome to Virtual World Seabird Conference 3 - vWSC3! Whether you are in your office or lab, at home, in a coffee shop or bar poaching some wifi, or at a remote field site or research vessel – we are very excited to welcome you to the third ever World Seabird Conference. 

We would like to thank ALL of you for being so patient as WSC3 was scheduled, postponed, rescheduled, revised to virtual, and scheduled again. Throughout all those iterations there was one message that remained perfectly clear – seabirders were eager to meet and share their science. If we could not meet in person then virtual it would have to be, but a 3rd WSC was something everyone wanted. That support and commitment helped the WSU Board of Directors and Member Societies sort through all of the challenges they faced to plan and hold this conference. 

The list of those that need to be thanked is long and, while we plan on recognizing many during the live closing plenary, it is important to do so here in writing as well. 

The Australasian Seabird Group was our Local Host for our plan to meet in Hobart, Tasmania. They invested substantial time and effort to find venues and plan events that we unfortunately were not able to visit. Nonetheless we appreciate their work on behalf of WSC3 and encourage all of you to thank them when you see their members in Gathertown or elsewhere during our virtual meeting. Their willingness to host created the initial excitement for WSC3 and without that our vWSC would not have been possible.

We also wish to thank the Science Program Committee, the Virtual Committee, and the Early Career Scientist Committee for their hard work planning the logistics, events, and schedule for vWSC3. These committees also had to deal with changing parameters and short timelines that made what is always a challenging task even more challenging. The Travel Awards Committee also invested time and effort in developing procedures for awarding travel funds that ultimately would not be implemented. 

Our ability to shift from an in-person to a virtual meeting, and to do so in a way that would be financially feasible, was due to the effective efforts of The International Fundraising Committee and to our financial sponsors. The IFC raised funds to support WSC3 and then, through the good relationships they built with sponsors, ensured we could re-envision how those funds could be used to support a virtual conference that would be affordable and high-quality.

We all owe the WSU Board of Directors and the Representatives of the Member Societies a great deal of thanks. They are the ones who manage the WSU and, for the past 18 months, have had to have a series of challenging meetings and conversations, have had to make a series of difficult choices, have had to do all of that while considering the short- and long-term health of WSU and the World Seabird Conferences, and did this while also managing their own challenges at their day jobs. We are grateful for their diligence, patience, foresight, and throughout all of the meetings, their collegiality. Also – a 6-year term is quite a commitment!

There would not be a WSC3 without a successful WSC1 and WSC2. Thanks go to the Pacific Seabird Group for their support of WSC1 in Victoria, Canada, and to the African Seabird Group for their support of WSC2 in Cape Town, South Africa. In each of these endeavors and for our current conference we were fortunate to work with a dependable and trustworthy partner in Podium Conferences. Michelle Smith and Marischal de Armond have become valued members of our team and have not only helped us plan conferences but have assisted and advised the WSU Chairs and Board on issues above and beyond conference planning. 

As we embark on our vWSC3 week we extend to all of you our thanks for showing up, for being patient, and most importantly for the work you do with seabirds. We are all part of a unique, global community that shares an interest, a fascination, and a passion for birds that make a living in our world’s oceans. We have advanced the science, conservation, and management of seabirds as well the ecosystems they inhabit. We are consistently impressed and motivated by the work you do. 

The WSU formed in 2010 because we saw the need for a global organization to address challenges at a global level. Over the past 11 years WSU has grown, adapted, and evolved to become the community that this week is making vWSC3 a reality. Enjoy the week, appreciate and support the friends and colleagues you have made in the community, and if you see us in a virtual hallway please stop and say hello! 

Thank you for the opportunity to serve all of you and the WSU over the past few years,

Nicholas Carlile, Interim Chair, WSU<br>
Patrick Jodice, 2nd Chair of the WSU<br><br>

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Join us for four days of science, networking and virtual engagement with delegates from around the world!

**Abstract:**

Gulls are one of the very few avian taxa to occur on all continents, and many species have adapted remarkably well to living alongside humans in urban environments. Paradoxically, many of these species continue to experience overall population declines, even as urban-nesting populations grow. In this talk, we will present details about several gull species that occupy the Pacific coast of North America: Glaucous-winged (Larus glaucescens), Western (L. occidentalis), Herring (L. argentatus), Mew (L. canus), and Heermann's (L. heermanni). Drawing on six years of field work across Canada and the US, we will compare and contrast the urban ecologies of these species with those of their declining, non-urban conspecifics. Nest site demographics, as well as colony density, nest fidelity, and reproductive success figures will be presented. We will also discuss several spatial models that we have developed to predict urban-nesting behaviour in these species. As urban-nesting becomes more commonplace, a host of new human-wildlife conflicts can arise, as well as many exciting conservation opportunities. These issues and ideas demand a deeper knowledge of the breeding ecology of urban gulls, and our work represents another step toward this.

**Authors:**

Edward Kroc¹, Louise Blight²

¹University of British Columbia, ²Procellaria Research & Consulting

technical paper

**Abstract:**

On the sandstone cliffs of the Dunedin coastline (south-east coast New Zealand, 46°S) the only mainland colony of fairy prions persists on a ledge that is inaccessible to rats and other mammals. Eighty nest boxes and artificial burrows have been installed and taken up by prions within the small colony of fifty natural burrows. The chick production of this banded population has been monitored since 2004. Geolocator tracking in 2011-12 shows that Dunedin prion parents forage near New Zealand during the breeding season. Each January since 2005 the date and weight of chicks at fledging has been recorded. The median values during this period (2005 to 2021) were; fledge weight 123g, maximum weight 170g, fledge date 27 January, and breeding success 0.80. Through all these years, including the el Niño of 2015 and the Tasman Sea marine heat wave of Nov 2017- Feb 2018 the prions have maintained consistent success in raising eggs to chicks, then onto fledging. Temperature loggers in sunny nest boxes during the 2018 Tasman Sea marine heat wave often recorded temperatures greater than 25°C, sustained for three hours in January. There were no observed effects upon the resident chicks. The fate of chicks after fledging is hard to determine as it takes five to seven years before the majority are seen at the colony as adults. In conclusion, the breeding of fairy prions at this location is not sensitive to the variations in climate that have occurred so far.

**Authors:**

Graeme Loh¹, Sarah Saunderson²

¹Ornithological Society NZ, ²University of Otago

Successful fairy prion (Pachyptila turtur) breeding through the climate events of the last seventeen years

**Abstract:**

Shy albatross are an endemic Australian seabird, with three breeding colonies off the coast of the island state of Tasmania. Like many species, climate change is a significant future threat, however, the specific impacts remain unclear. As well as macro-scale environmental changes, we expect local weather and microclimate at the breeding colony to influence breeding success from our observations of spatial and temporal clumping of breeding attempt failures. Our data show high-quality nests significantly increase breeding success and we capitalised on this discovery by trialing artificial nests as a climate adaptation intervention strategy, to great success. To further explore the fine-scale variation across the colony and which factors drive breeding success, we use eight seasons of data from a robotic gigapixel remote-monitoring camera providing daily observations of over 100 nests. We analyse spatial and temporal patterns of chick mortality and breeding success to understand the environmental, physical, and intrinsic factors at an individual nest-scale to inform the potential and implementation of future climate adaptation interventions.

**Authors:**

Claire Mason¹, Alistair Hobday², Rachael Alderman³, Mary-Anne Lea¹

¹University of Tasmania, ²CSIRO, ³Department of Primary Industries, Parks, Water and Environment (DPIPWE)

Local weather, microclimate and nest-scale drivers of shy albatross chick mortality and breeding success

**Abstract:**

Continued warming of the Earth's atmosphere is having a range of ecological, behavioural and physiological impacts on seabirds. The effects of changes in sea surface temperatures on seabirds are well-documented, but the effects of high ambient temperatures on land are not. Like all penguins, moult in Little Penguins is 'catastrophic', with all feathers shed and replaced in ~18 days. As they do not have adequate insulation and waterproofing to forage at sea, birds are constrained to land in some of the hottest parts of the year. Long-term survival analysis suggests that adult mortality is greatest in years when high ambient temperatures are paired with low humidity during moult. Given current climate projections, successful management of Little Penguins requires a better understanding of the physiological processes and habitat features that influence mortality events. In this study we aimed to identify which birds are most at risk of heat stress during moult, and why. Using a novel approach to field respirometry, we investigated thermoregulatory costs of moulting birds in response to ambient temperature and humidity. Our results predicted that penguins in early stages of moult would be most affected by heat exposure, as they displayed a significant increase in metabolic rate at higher temperatures compared to mid and late moult birds. During a heat wave in 2019, the greatest mortality event of moulting adult Little Penguins on record occurred at Phillip Island in south-Eastern Australia. As predicted, all recorded deaths were birds in early stages of moult. We are currently quantifying the microclimates of burrows and vegetation types and investigating how birds are using structural habitat during extreme weather events. Results will help determine how Little Penguins are currently coping with extreme temperatures on land, and identify adaptation options most likely to reduce negative climate change impacts for the species across their distribution.

**Authors:**

Lauren Tworkowski¹, Peter Dann², Ursula Ellenberg¹, Kylie Robert¹

¹La Trobe University, ²Phillip Island Nature Parks

Impacts of terrestrial heat waves on survival of little penguins during moult

**Abstract:**

Intraspecific competition for food can be especially high in colonial breeding seabirds. To minimize colony-induced or annual foraging challenges, the diet may vary among individuals, but few studies have simultaneously investigated the effects of both extrinsic conditions (e.g. colony, year effects) and parameters of an individual (e.g. sex, age, individual quality) on diet in seabirds. Using stable isotope analyses, we studied the diet of 214 Adélie penguins of known sex, age and breeding quality, nesting in two colonies on Ross Island, Antarctica, over three breeding seasons. During the study, δ15N and δ13C isotope values were lower in penguins breeding at Cape Crozier compared to those at Cape Bird, resulting in a difference in estimated prey proportions. Cape Bird penguins consistently consumed more energy-rich silverfish, while birds at Cape Crozier ate more crystal krill. We also found inter-annual differences in diet, with a higher dietary fish proportion in both colonies during 2011. Males had significantly higher δ15N values, indicating that males consumed more fish than females. This sexual segregation in diet was particularly pronounced at Cape Bird, where the overall isotopic niche was wider than at Cape Crozier. Differences in diet among adults of varying ages only existed at Cape Bird, where middle-aged penguins consumed more fish than old and young penguins. This study provides evidence that penguin diet is largely driven by annual, seasonal and local abundances of prey, with only some individuals selectively foraging for more nutritional prey if prey choices are present.

**Authors:**

Melanie Massaro¹, David Ainley², Jarrod Santora³, Petra Quillfeldt⁴, Amélie Lescroël⁵, Amy Whitehead⁶, Arvind Varsani⁷, Grant Ballard⁵, Phil Lyver⁸

¹Charles Sturt University, ²H.T. Harvey & Associates, ³University of California, ⁴Justus Liebig University Giessen, ⁵Point Blue Conservation Science, ⁶National Institute of Water and Atmospheric Research, ⁷Arizona State University, ⁸Manaaki Whenua Landcare Research

Diet segregation in Adélie penguins: some individuals attempt to overcome colony-induced and annual foraging challenges

**Abstract:**

Short-tailed shearwater (STSH) breeding in Tasmania employs a dual foraging strategy and they feed in the Southern Ocean during long trips. In the Southern Ocean, Antarctic krill (krill) is a key species, while myctophids can be one of alternatives. In the Indian sector, where krill abundance is relatively low compared to the Scotia-Weddell Sea, krill-independent food web may be developed regionally. In this sector krill-dependent food web may be dominant over the continental slope while krill-independent food web may be in oceanic zone. To understand how does STSH move in these two habitats in the Indian sector, we tracked individuals using GPS logger and identified prey species of tracked individuals using fatty acid signature of stomach oils. We collected 14 long trip tracks and two oil samples from STSH breeding on Wedge Island in Tasmania in Jan- Feb 2019. Two core-use areas (50% kernel density) were recognized. One (named "core-2") was in 160°E 67°S l in the continental slope zone and the other ("core-3") was in 120°E 57°S in the oceanic zone. 93% of birds used Core-2 during the long trips. We analyzed fatty acid composition of stomach oil in two birds spending 7 days in 2core area before visiting the colony. The fatty-acids profile indicated that the two birds fed on myctophids. Core-3 might also be important to some extent but no diet samples were available at this moment. This study indicates that at least some individuals fed on myctophids even over the continental slope. This study indicate the importance of myctophids in the Southern Ocean ecosystem.

**Authors:**

Sarara Azumi¹, Yutaka Watanuki¹, Akinori Takahashi², Nobuo Kokubun², Yasuhiro Ando¹, Masato Moteki³, Fernando Arce Gonzalez⁴, Mary-Anne Lea⁴, Mark Hindell⁴

¹Hokkaido University, ²National Institute of Polar Research, ³Tokyo University of Marine Science and Technology, ⁴University of Tasmania

Foraging movement of short-tailed shearwater in the Southern Ocean

**Abstract:**

Breeding Adélie penguins forage at sea and return to land to provision their chicks, adjusting their foraging behaviour in response to environmental fluctuations over time. At Béchervaise Island, a nesting site in an East Antarctic population, Adélie penguin diving behaviour remains undocumented. This represents a key area of uncertainty in efforts to understand and predict foraging success at this colony. We compiled a multi-year telemetry dataset from time−depth recorders deployed from 1992 to 2004 on 64 birds at Béchervaise Island. We examined diving activity at multiple scales, ranging from foraging trips (n = 125) to dive bouts (n = 3461) to individual dives (n = 84 521), and then characterised the stage- and sex-specific variation in diving behaviour of chick-rearing Adélie penguins using linear mixed effect models. Total foraging trip effort (trip duration, number of dives, vertical distance travelled and number of wiggles [a proxy for prey ingestion]) substantially increased as the chick-rearing period progressed (guard through crèche), consistent with increasing chick provisioning and self-maintenance requirements over time. Foraging activity was predominantly structured in periods of sustained diving bouts, indicating sustained foraging effort over the course of the foraging trip. Diving behaviour (dive-level depth, duration, bottom time and attempts of catch per unit effort) varied in relation to sex and chick-rearing stage. Dives were performed more frequently during high and low levels of solar light, which is likely linked to visual predation strategies or prey activity. Our findings advance our understanding of this population's foraging behaviour, which is ultimately required to underpin the conservation and management of this breeding colony.

**Authors:**

Javed Riaz¹, Sophie Bestley¹, Simon Wotherspoon¹, Julien Freyer¹, Louise Emmerson²

¹Institute for Marine and Antarctic Studies, University of Tasmania, ²Australian Antarctic Divison

From dives to bouts to trips: temporal patterns in the diving behaviour of chick-rearing Adélie penguins, East Antarctica

**Abstract:**

The enigmatic Fiordland penguin, or tawaki, remain one of the least known penguin species. Recent surveys suggest that tawaki populations are increasing which is in stark contrast to other eudyptid penguins that have undergone steep declines. Despite their limited distribution along a mere 500 kilometer stretch of coastline in New Zealand's rugged and inaccessible southwest, tawaki occupy remarkably diverse marine habitats. In 2014, the Tawaki Project set out to study the penguins' ecology across their breeding range. We examined their foraging behavior during and outside of the breeding season at three sites representative of the species' varied marine habitats. Over the course of six years, we documented the impact of El Niño on foraging range and breeding success and tracked extreme long-distance movements in the pre-moult and wintering periods. These data paint an intriguing picture of a crested penguin species that lives outside the zone occupied by congeners (subtropical instead of sub-Antarctic waters). They show remarkable versatility in their foraging strategies depending on available marine habitat. During the pre-moult, tawaki travel much farther distances than any other penguin species, and during their even longer winter migration they forage as far as the Polar Front. Apparently, tawaki can afford the costs of these marathon journeys, which not only exposes the species' sub-Antarctic origins but also indicates considerable adaptability. In the face of significant environmental change, doing things differently than other crested penguins appears to be tawaki's secret of success.

**Authors:**

Ursula Ellenberg¹, Thomas Mattern¹, David Houston², Robin Long³, Klemens Pütz⁴, Pablo Garcia Borboroglu⁵, Philip Seddon⁶

¹Global Penguin Society/ Eudyptes EcoConsulting, ²Department of Conservation, ³West Coast Penguin Trust, ⁴Antarctic Research Trust, ⁵Global Penguin Society/ Centro Nacional Patagónico (CONICET), ⁶University of Otago

Sprint-ace and marathon penguin: How Fiordland penguins/ tawaki defy clichés about crested penguin marine ecology - and appear to do great

**Abstract:**

Species migratory behaviour and preferences in oceanic habitats respond to dynamic changes in their environment, they will adapt their foraging strategies which can impact predator-prey relationships, displace other species, change species range or alter their annual cycle. Wedge-tailed shearwaters Ardenna pacifica are a migratory procellariiform found throughout the Pacific and Indian Oceans, utilising a variety of tropical and sub-tropical habitats and breeding across a wide latitudinal range that recently has been extending poleward. Information on their diet, niche breadth and habitat utilisation has not been well-documented for populations at their southern-most extent, with limited information of this species from temperate south-eastern Australia. Wedge-tailed shearwaters were tracked over a three-year period across two distinct latitudinal breeding colonies (temperate versus sub-tropical) from south-eastern Australia, with both populations showing high-levels of winter site-fidelity and dietary consistency. This was not the case during the breeding phase, with clear habitat partitioning exhibited with the temperate population targeting an area much further south on or near the sub-tropical frontal zone (STFZ). The results identified a staging trip just prior to their northern migration down to the STFZ for all three years for the temperate population and less predictably for the sub-tropical population. The analysis from feather stable isotopes revealed different foraging strategies exhibited during the breeding phase with a degree of trophic δ15N and habitat δ13C variation. The results from this study, show clear habitat partitioning occurred between populations and a high degree of plasticity between years.

**Authors:**

Penny Beaver¹, Mary-Anne Lea¹, Nicholas Carlile²

¹University of Tasmania, ²NSW Department of Premier and Cabinet

A comparative study of a temperate and subtropical, small procellariiform, the Wedge-tailed shearwater Ardenna pacifica in southeastern Australia

**Abstract:**

In endangered species, harvesting individuals for translocations can negatively impact source populations and thus, translocation cohorts should remain small, limiting potential establishment of recipient populations. This balancing act is further complicated through meta-population dynamics if the target species is highly mobile. The critically endangered Whenua Hou Diving Petrel (Kuaka; Pelecanoides whenuahouensis) is a highly mobile seabird that could benefit from translocations to mitigate current threats, but only one small population remains. We used a novel metapopulation approach to an integrated population model (IPM) to combine long-term data with meta-analyses and expert elicitations (using a Shiny app) to estimate vital rates, population size, population growth, and meta-population dynamics, predict harvest impact on the source, and project establishment of recipient populations under various translocation scenarios. Establishment of a recipient population without excessive impact on the source was dependent on meta-population dynamics. Accounting for juveniles returning to the source post-translocations mitigated impact on the source, but reduced establishment success of the recipient. Accounting for movements of adults and juveniles between source and recipient populations resulted in an equilibrium, negating effects of different harvests intensities. We illustrate that establishment of new populations of endangered, highly mobile seabirds can be feasible, even when metapopulation dynamics are present, yet our results also show considerable uncertainty. Therefore, we recommend that these challenging translocations are conducted within adaptive management frameworks, incorporating monitoring of source and recipient populations, to evaluate impact and establishment and adjust harvest intensities and timeframes when required.

**Authors:**

Johannes Fischer¹, Heiko Wittmer², Caio Kenup³, Kevin Parker⁴, Igor Debski¹, Graeme Taylor¹, John Ewen⁵, Doug Armstrong³

¹New Zealand Department of Conservation, ²Victoria University of Wellington, ³Massey University, ⁴Parker Conservation, ⁵Zoological Society of London

Predicting harvest impact and translocation success in endangered and highly mobile species: a case study of a critically endangered petrel

**Abstract:**

Newell's Shearwater (Puffinus auricularis newelli; NESH) and Hawaiian Petrels (Pterodroma sandwichensis; HAPE) are both listed under the Endangered Species Act and are declining due to habitat degradation by feral ungulates (pigs, goats) and invasive exotic plants, predation by feral domestic cats, pigs, rats, and introduced Barn Owls, and collisions with power lines and structures often exacerbated by light attraction. Translocation to protected breeding sites with social attraction was proposed in the 1983 recovery plan and was ranked as priority one in the 2011 interagency 5-year Action Plan. In 2012, funding became available to begin preparing for translocations to Kīlauea Point National Wildlife Refuge. A peer-reviewed translocation plan was developed based on protocols used in New Zealand. A predator proof fence was completed in September 2014 and all non-native mammals were removed shortly afterwards. In August 2015 habitat restoration began and 50 artificial burrows were installed. From 2015-2019 a total of 90 HAPE and 67 NESH chicks that had not emerged from their montane burrows were removed by hand and transported via helicopter to the refuge and were hand-fed a fish, oil, Pedialyte® and squid mixture until they fledged. All but 3 HAPE successfully fledged resulting in a 97% and 100% fledging rate for HAPE and NESH respectively. Morphometric monitoring was done daily to assess chick age and health and the overwhelming majority of birds appeared to be in excellent health. Once complete, this project is expected to result in a new, secured and accessible breeding population of Hawaiian Petrels that will be crucial along with other protected and managed colonies in helping to prevent the extinction of this species and restoring a missing component of the coastal ecosystem in Hawaii.

**Authors:**

Lindsay Young¹, Andre Raine², Robby Kohley¹, Megan Dalton¹, Leilani Fowlke¹, Daniela Casillas¹, Erika Dittmar¹, Marilou Knight¹, Michael Mitchell³, Hannah Nevins⁴, Eric VanderWerf¹

¹Pacific Rim Conservation, ²Kauai Endangered Seabird Recovery Project, ³US Fish and Wildlife Service, ⁴American Bird Conservancy

Urban gulls of the Pacific coast of North America: Balancing wildlife conflict concerns with the protection of urban breeding sites

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Urban gulls of the Pacific coast of North America: Balancing wildlife conflict concerns with the protection of urban breeding sites

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Next from 3rd World Seabird Conference

Successful fairy prion (Pachyptila turtur) breeding through the climate events of the last seventeen years

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The effect of marine anthropic activities on the behavior of Humboldt penguin (Spheniscus humboldti) in two guano islands of Peru

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