Year-round use of anthropogenic food sources in human modified landscapes by adult and young Kelp Gulls

Food Webs, Год журнала: 2023, Номер 35, С. e00274 - e00274

Опубликована: Март 2, 2023

Язык: Английский

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Effect of urbanization on individual condition of a threatened seabird: the Olrog’s Gull Larus atlanticus

Urban Ecosystems, Год журнала: 2023, Номер 26(2), С. 411 - 424

Опубликована: Март 31, 2023

Язык: Английский

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Model-based prediction of a vacant summer niche in a subarctic urbanscape: A multi-year open access data analysis of a ‘niche swap’ by short-billed Gulls

Ecological Informatics, Год журнала: 2023, Номер 78, С. 102364 - 102364

Опубликована: Ноя. 10, 2023

Gulls belong to the seabird group, and are widely considered be ecological indicators. Increasing urbanization throughout Anthropocene has led rise of urban landscape ('urbanscape') as a globally dominant habitat. Though historically less developed, similar patterns emerging in boreal forest, world's largest forest ecoregion. Here we evaluate position migratory Short-billed (Larus canus) subarctic urbanscape. We attempt investigate summer niche swap theory, which gulls annually fill vacant occupied by common ravens winter. For that investigation conducted seasonal plot surveys for Gull presence from 2013 2016 Fairbanks, AK municipality. These data were made publicly available. compiled them open source ESRI geographic information system (GIS) platform then added 68 open-access predictor layers, including socio-economic U.S. Census data. trained, tested, evaluated performance an ensemble machine learning models, resulting predictions gull-abundance hotspots coldspots, at 100-m resolution inference. find prefer industrial areas near man-made water bodies, impervious surfaces, gravel pits, strip malls, transfer sites (garbage dumps) some young vegetation. This study is first-known utilize blended 'Big Data' approach, combination with traditional field-based collection alternative model assessments, order characterize niche. Our findings, digital infrastructure herein, provide interdisciplinary baseline potential applications planning monitoring spread disease reservoirs.

Язык: Английский

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City Living: Nest-Site Selection Preferences in Urban Herring Gulls, Larus argentatus

Geographies, Год журнала: 2022, Номер 2(2), С. 161 - 172

Опубликована: Март 23, 2022

Herring gulls (Larus argentatus) are declining globally, but there populations who taking advantage of the new foraging and nesting opportunities afforded to them by urban landscapes. Nest-site selection (NSS) in environs is understudied, despite its critical role supporting planning policy, biodiversity conservation management human–wildlife conflict. The aim this study was assess contribution anthropogenic habitat features NSS L. argentatus at different hierarchical levels Fingal County, Ireland. We used generalised linear models with a logit function investigate relationship among nest sites, building features, street furniture (i.e., streetlights refuse bins), landscape presence conspecifics three levels, including county, town, colony levels. preferentially chose buildings that were closer food sources level, while avoiding when considered isolation. Conspecific attraction county indicated individuals avoided neighbouring yet inverted town suggesting preference. Moreover, 75% nests within 30 m each other (the average road width area) measured level. Various relationships identified, within-population variation preferences for sites. There appears be substantial population which does appear driven cross-scale decisions involved nest-site selection.

Язык: Английский

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Built up areas in a wet landscape are stepping stones for soaring flight in a seabird

The Science of The Total Environment, Год журнала: 2022, Номер 852, С. 157879 - 157879

Опубликована: Авг. 6, 2022

The energy exchange between the Earth's surface and atmosphere results in a highly dynamic habitat through which birds move. Thermal uplift is an atmospheric feature many are able to exploit order save flight, but governed by complex surface-atmosphere interactions. In mosaic landscapes consisting of multiple land uses, spatial distribution thermal expected be heterogenous may use landscape selectively maximise flight over areas where soaring opportunities best. Flight generalists such as lesser black-backed gull, Larus fuscus, less reliant on than obligate birds. Nevertheless, gulls select behaviours routes response or anticipation reduce their transport costs, even isn't prevalent. We explore using high-resolution GPS tracking characterise individual instances detailed modelling map experience. determine that regularly undertake soaring, wet temperate below sea level. By examining relationship gull use, we built up areas, particularly towns cities, provide hotspots preferentially make of, resulting more for saving soaring.

Язык: Английский

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Fatty acids composition in yellow-legged (Larus michahellis) and lesser black-backed (Larus fuscus) gulls from natural and urban habitats in relation to the ingestion of anthropogenic materials

The Science of The Total Environment, Год журнала: 2021, Номер 809, С. 151093 - 151093

Опубликована: Окт. 25, 2021

Язык: Английский

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Object neophilia in wild herring gulls in urban and rural locations

Journal of Avian Biology, Год журнала: 2022, Номер 2023(1-2)

Опубликована: Дек. 15, 2022

Living with increasing urbanisation and human populations requires resourcefulness flexibility in wild animals' behaviour. Animals have to adapt anthropogenic novelty habitat structure resources that may not resemble, or be as beneficial as, natural resources. Herring gulls Larus argentatus increasingly reside towns cities breed forage, yet how are adjusting their behaviour life urban areas is fully understood. This study investigated herring gulls' responses novel common objects rural locations. We also examined whether age influenced object response found that, out of the 126 individual presented objects, 34% approached them. suggests majority targeted were wary lacked interest experimental set‐up. Of 43 we those tested locations more slowly than counterparts. Overall, showed no preference for either did influence likelihood approach, approach speed choice. Individuals paid most attention they first, potentially indicative preferences. Our findings indicated attracted anecdotal reports suggested. Covering up obvious food rewards thus help mitigate human–gull conflict over sources.

Язык: Английский

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Early-life diet does not affect preference for fish in herring gulls (Larus argentatus)

PeerJ, Год журнала: 2024, Номер 12, С. e17565 - e17565

Опубликована: Июль 11, 2024

Urban populations of herring gulls ( Larus argentatus ) are increasing and causing human-wildlife conflict by exploiting anthropogenic resources. Gulls that breed in urban areas rely on varying amounts terrestrial foods e.g ., domestic refuse, agricultural commercial waste) to feed themselves. However, with the onset hatching, many parent switch sourcing more marine than or provision their chicks. Although may meet chick calorific requirements for growth development, some such bread) have lower levels protein other key nutrients compared foods. whether this parental diet is driven chicks’ preference foods, food preferences shaped types provisioned parents, remains untested. This study tests can be influenced experimentally manipulating ratio time which were available (80:20 vice versa rearing diets two treatment groups rescued gull Each was randomly assigned each 27 captive-reared chicks duration study. We tested individual throughout development captivity using arrays four choices (fish, cat food, mussels brown bread). Regardless dietary group, we found all preferred fish almost refused eat most bread offered. Our findings suggest early-life diet, manipulated different available, did not influence preferences. Instead, developed a strong persistent appears match adult gulls’ upon hatching reinforce provisioning during development. wild would refuse sufficient extent provisioning, requires further Longitudinal studies animal track individuals’ foraging specialisations life required shed light use resource exploitation.

Язык: Английский

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Plenty of rooftops with few neighbours occupied by young breeding Yellow‐legged Gulls (Larus michahellis): Does this occur at the expense of their health condition?

Ibis, Год журнала: 2022, Номер 165(1), С. 312 - 321

Опубликована: Июль 29, 2022

Gulls, as largely flexible opportunistic individuals, have been increasingly breeding in many cities around the world, but it is still unclear whether urban habitats are of equal or higher quality than traditional natural represent an ecological trap with immediate reproductive benefits longer‐term detrimental consequences to health. Here we present a study parameters (nest density, egg dimensions, clutch size, hatching success and adult body condition) physiological (erythrocyte sedimentation rate, heterophil/lymphocyte ratio, haemoglobin concentration measurements oxidative stress) indicators general health condition Yellow‐legged Gull Larus michahellis adults chicks from colonies. Gulls largest area (Porto) laid smaller eggs clutches, showed significantly lower occurrence inflammatory processes chicks, slower early chick growth colony Deserta. This suggests that gulls might be facing important trade‐offs between advantages density colonies, fewer intraspecific interactions disease transmission probability, disadvantages having anthropogenic diet usually nutritional value.

Язык: Английский

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Habitat use of urban nesting yellow-legged gulls in Croatia during the breeding season

Natura Croatica, Год журнала: 2023, Номер 32(2), С. 399 - 412

Опубликована: Дек. 30, 2023

Because of increasing urbanization, some opportunistic birds such as gulls, started to exploit various artificial marine and terrestrial food sources. To better understand urban gull ecology habitat use, a study was done on yellow-legged (Larus michahellis) during the breeding season in Zadar, coastal city Adriatic Sea. Ten adult gulls (five females five males) were caught building rooftops late incubation period fitted with GPS-GSM solar power transmitters. In total, 2377 trip segments (no. GPS points = 19906) analyzed, most them being classified nest attendance (56.32 %) foraging movements (37.10 %). Tracking data showed that mostly use areas, agricultural lands, dump site, grasslands. Females more active while foraging, longer duration segment length, travelling further away from colony, males tended rest than females. Both habitats for resting, however used lands significantly males. Even though are generalists, individuals preference certain habitats. After calculating proportional similarity index, high specialization habitat.

Язык: Английский

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