Ontogeny of foraging behaviour in an opportunistic gull inhabiting urban marine ecosystems DOI Creative Commons
Joan Navarro, Víctor Martín‐Vélez, Joan Giménez

et al.

Wildlife Biology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Urbanization affects ecosystems by reducing biodiversity and displacing species from native habitats. While some suffer, others, like urban wildlife, adapt through innovative feeding behaviours that improve their fitness in human‐altered settings. Despite research on wildlife areas, the development of foraging behaviour is still understudied. Here, we examined age‐related differences yellow‐legged gulls Larus michahellis Barcelona (Spain), a densely populated coastal ecosystem. Using biologging technologies trophic markers, compared strategies, habitat use, human interactions, niches juvenile, immature, adult over three breeding seasons. The results showed spatial distribution this opportunistic species. Juveniles immatures mainly foraged ports at sea, while adults favoured These patterns likely stem reproductive constraints lower efficiency younger birds. Adults' primary use habitats also explains higher niche. Furthermore, fishing activity significantly influenced gull across age groups, with strong associations between vessels. By studying how life stage influence behaviour, provides insights to guide targeted management strategies for

Language: Английский

Neophobia and exploration behavior in urban gulls: the Kelp Gulls (Larus dominicanus) as a study case DOI

M Candelaria Biagiotti Barchiesi,

Germán Ó. García, Melina V. Castano

et al.

Behavioural Processes, Journal Year: 2025, Volume and Issue: unknown, P. 105147 - 105147

Published: Jan. 1, 2025

Language: Английский

Citations

0
Uso de recursos de origen antrópico por parte de aves marinas que reproducen en la Patagonia argentina DOI Creative Commons
Pablo Yorio, Cristian Marinao, Nicólas Suárez

et al.

El Hornero, Journal Year: 2025, Volume and Issue: 39(2), P. 139 - 172

Published: Jan. 16, 2025

Las aves marinas son uno de los grupos más amenazados a nivel global. Sin embargo, varias actividades humanas también proveen recursos que estas pueden utilizar en su beneficio. Se presenta una síntesis del conocimiento sobre el uso antrópicos por parte las se reproducen litoral patagónico argentino. investigaciones realizadas indican un total quince especies utilizan para alimentación y/o nidificación durante meses la temporada reproductiva. De diferentes alimento origen antrópico identificados, provisto pesca comercial operaciones mar es utilizado mayor número (doce) y representa oferta extensión geográfica. Un menor hacen residuos urbanos (cuatro) derivados recreativa (tres) actividad agrícola-ganadera (seis). En relación nidificar, información disponible mayormente anecdótica, e indica seis aprovechan ambientes estructuras antrópicas construir sus nidos, siete incorporan materiales mismos. discuten posibles beneficios costos asociados dicho uso, consideran conflictos otras poblaciones humanas. espera esta conocimiento, identificando limitaciones estudios previos vacíos información, contribuya definición prioridades investigación al desarrollo recomendaciones monitoreo interacciones entre reproductoras

Citations

0
Integrating Deep Learning into Genotoxicity Biomarker Detection for Avian Erythrocytes: A Case Study in a Hemispheric Seabird DOI Creative Commons
Martín G. Frixione, Facundo Roffet, Miguel A. Adami

et al.

Mathematical and Computational Applications, Journal Year: 2024, Volume and Issue: 29(3), P. 41 - 41

Published: May 28, 2024

Recently, nuclear abnormalities in avian erythrocytes have been used as biomarkers of genotoxicity several species. Anomalous shapes are usually detected the nuclei by means microscopy inspection. However, due to inter- and intra-observer variability, classification these blood cell could be problematic for replicating research. Deep learning, a powerful image analysis technique, can this context improve standardization identifying biological configurations medical veterinary importance. In study, we present standardized deep learning model classifying abnormal erythrocyte smears hemispheric synanthropic Kelp Gull (Larus dominicanus). We trained three convolutional backbones (ResNet34 ResNet50 architectures) obtain models capable detecting cells. The was performed at discrimination levels classification, with broad categories subdivided into increasingly specific subcategories (level 1: “normal”, “abnormal”, “other”; level 2: “ENAs”, “micronucleus”, 3: “irregular”, “displaced”, “enucleated”, “other”). results were more than adequate very similar 1 2 (F1-score 84.6% 83.6%, accuracy 83.9% 82.6%). 3, performance lower 65.9% 80.8%). It concluded that should considered most appropriate it is 1, quality performance. This method has proven fast, efficient, approach reduces dependence on human supervision erythrocytes, adapted contexts reduced effort.

Language: Английский

Citations

1
White‐faced and Black‐faced ibises foraging on predictable anthropogenic food subsidies in Patagonia, Argentina DOI
Martín G. Frixione, Nora Lisnizer, Pablo Yorio

et al.

Austral Ecology, Journal Year: 2023, Volume and Issue: 48(8), P. 2230 - 2238

Published: Aug. 22, 2023

Abstract Waste associated with human activities can benefit opportunistic species at the individual and population levels but could also expose them to pathogens or toxins. We provide information on unreported foraging habits of White‐faced ibis ( Plegadis chihi ) Black‐faced Theristicus melanopis in Chubut River Valley, an urban agricultural landscape eastern Patagonia, Argentina. Both were recorded during monthly counts made between February June 2021 anthropogenic food sources along lower river valley, although almost exclusively those sites offering waste from livestock production. This is first record both this type source origin. ibises present numbers that varied 2 679 individuals 1 18 individuals, respectively, depending site month. walking over carcasses viscera probing into these remains soft soil surrounding ponds where liquids generated by rendering processes disposed. Given current growth production area, further monitoring assessment other months year are needed adequately interpret trophic ecology potential conflicts populations.

Language: Английский

Citations

2
Habitat use of urban nesting yellow-legged gulls in Croatia during the breeding season DOI Open Access
Biljana Ječmenica, Jelena Kralj, Louie Thomas Taylor

et al.

Natura Croatica, Journal Year: 2023, Volume and Issue: 32(2), P. 399 - 412

Published: Dec. 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.

Language: Английский

Citations

1
Winter consumption of the introduced Green Crab Carcinus maenas by Kelp Gulls Larus dominicanus DOI
Nora Lisnizer, Paula Giudici,

Miriam Pollicelli

et al.

New Zealand Journal of Marine and Freshwater Research, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 14

Published: Jan. 25, 2024

The introduction of species can have negative effects on species, communities, and ecosystems, although native predators may profit from the introduced prey. We present an evaluation consumption Green Crab (Carcinus maenas) by Kelp Gulls (Larus dominicanus) during austral winter in Patagonia, Argentina. remains were 9.4% (n = 416) Gull pellets collected between June August 2021, at four coastal sectors distributed along more than 400 km coastline. Frequency occurrence Crabs varied 0 66.7% depending location, being similar for three studied months. Overall, gulls included least 35 food items their diet with variable contributions different categories, again location. This is first report provides baseline information understanding role this newly invaded ecosystems.

Language: Английский

Citations

0
Estudio ornitolimnológico en el Seno de Reloncaví, Patagonia Norte, Chile DOI Creative Commons
Jaime R. Rau, Norka Fuentes,

Jorge Gallardo

et al.

El Hornero, Journal Year: 2024, Volume and Issue: 39(1), P. 65 - 77

Published: June 15, 2024

En este trabajo se emplea una aproximación ornitolimnológica para determinar la estructura de los ensambles aves en humedales Patagonia norte Chile. Se encontró mayor riqueza especies aquellos perímetro (un “proxy” del espejo agua) y mejor condición ambiental. Las contabilizaciones efectuaron bimensualmente desde mayo a noviembre 2021 el invierno mismo año determinaron nutrientes (e.g., nitrógeno, fósforo) parámetros físico-químicos oxígeno disuelto) dos más grandes. alta (>70), comparación con otros estudios realizados Chile, especialmente durante conteos efectuados pleamar. El relacionó positivamente abundancia individuos. Los situados extremos área estudio, menor superficie formas irregulares, presentaron individuos especies. Lo contrario ocurrió grandes, pesar presentar altas cargas nitrogenados fosforados. necesita investigación explicar importancia otras variables nivel paisaje.

Citations

0
Ontogeny of foraging behaviour in an opportunistic gull inhabiting urban marine ecosystems DOI Creative Commons
Joan Navarro, Víctor Martín‐Vélez, Joan Giménez

et al.

Wildlife Biology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Urbanization affects ecosystems by reducing biodiversity and displacing species from native habitats. While some suffer, others, like urban wildlife, adapt through innovative feeding behaviours that improve their fitness in human‐altered settings. Despite research on wildlife areas, the development of foraging behaviour is still understudied. Here, we examined age‐related differences yellow‐legged gulls Larus michahellis Barcelona (Spain), a densely populated coastal ecosystem. Using biologging technologies trophic markers, compared strategies, habitat use, human interactions, niches juvenile, immature, adult over three breeding seasons. The results showed spatial distribution this opportunistic species. Juveniles immatures mainly foraged ports at sea, while adults favoured These patterns likely stem reproductive constraints lower efficiency younger birds. Adults' primary use habitats also explains higher niche. Furthermore, fishing activity significantly influenced gull across age groups, with strong associations between vessels. By studying how life stage influence behaviour, provides insights to guide targeted management strategies for

Language: Английский

Citations

0