Colonization of the Yellow-legged gull in the southeastern Bay of Biscay and efficacy of deterring systems on landfill site

Castège, Iker; Milon, Emilie; Lalanne, Yann; D'Elbee, Jean

doi:10.1016/j.ecss.2015.11.011

Cited by 9 publications

(8 citation statements)

References 31 publications

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“…Landfills were frequented more during the non-breeding period (July-March). This supports other results reported in yellow-legged gulls in the Bay of Biscay: birds used landfills more during the winter than in summer (Jordi et al 2014, Castège et al 2016. The increased use of landfills in winter can be explained by two different processes.…”

Section: Discussionsupporting

confidence: 90%

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Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Egunez

Zorrozua

Aldalur

et al. 2018

Journal of Avian Biology

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Understanding the use of feeding sources at the local scale is crucial in comprehending the factors driving population dynamics, dispersal and territory use. Many gull (Larus spp.) populations have increased sharply, which is partly promoted by their use of landfills as a food resource. Although at the large scale it is known that birds from mainland colonies feed more on landfills than those from offshore colonies, at the local scale, this distance‐dependent exploitation has been little studied. Here, then, we study whether the extent of gulls’ use of landfill is distance‐dependent through the study of 3 different gull colonies and five separate landfill sites within a relatively small geographical area. After controlling for bird numbers by both age cohort and colony, we observed that the number of gulls found at each landfill was colony dependent and that it decreased non‐linearly with increased distance to place of birth.

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Section: Discussionsupporting

confidence: 90%

“…These results replicate the pattern observed at larger spatial scales (Moreno et al 2009, Ramos et al 2009, Castège et al 2016. Although the Getaria colony was the closest to Urteta landfill, a proportionally higher number of gulls from the Santa Clara colony was observed in the Urteta landfill.…”

Section: Discussionsupporting

confidence: 83%

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Egunez

Zorrozua

Aldalur

et al. 2018

Journal of Avian Biology

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“…Those initiatives are likely to reduce resources available to gulls. In combination with measures to deter gulls from foraging in key landfills (Castege, Milon, Lalanne, & d'Elbee, ), such measures could potentially reduce the number of gulls wintering at FP, and hence their guanotrophication effects.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, distance seems to play a role in determining the number of visits to each foraging site, and LBBG compensates for travel costs to a more distant foraging site by spending more time there (see also Arizaga et al, 2010). Movement data also in key landfills (Castege, Milon, Lalanne, & d'Elbee, 2016), such measures could potentially reduce the number of gulls wintering at FP, and hence their guanotrophication effects.…”

Section: Gull Activity At Foraging Sitesmentioning

confidence: 99%

Quantifying nutrient inputs by gulls to a fluctuating lake, aided by movement ecology methods

et al. 2019

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Eutrophication of aquatic ecosystems is a global problem with major ecological and economic impacts. In many lakes and reservoirs, guanotrophication occurs when roosting waterbirds import nutrients (nitrogen and phosphorus) from surrounding terrestrial habitats. To date, nutrient loading by waterbirds has been estimated based on censuses in the absence of detailed information on their movements. We quantified nutrient importation by the lesser black‐backed gull (Larus fuscus) to Fuente de Piedra (1,350 ha) in Andalusia (south‐west Spain), where an average of 36,288 individuals are counted in January. During seven winters from 2010 to 2017, we used movement data from 20 individual gulls tagged with Global Positioning System trackers that foraged in four landfills. Together with monthly bird counts and measurements of total N and P content in faeces and pellet samples, movement data were used to quantify the total external loading effect for different winters. Movement data allowed us to quantify the proportion of time spent in the lake and the time spent at different foraging sites and enabled correction of censuses. According to tracking data, on average 69% of the birds had already left the lake to head for feeding sites when waterbird counts were carried out. Nutrient inputs to the lake depend partly on the proportion of the day that gulls spend there, which was higher in late winters and was reduced when lake depth went below or above 20–35 cm. An estimated average of 10.17 kg N ha−1 year−1 and 2.07 kg P ha−1 year−1 were imported to this closed‐basin lake by gulls each winter, with highest values recorded in winter 2016–2017. Gull guano is the most important winter source of nutrients to the lake. Regurgitated pellets have been ignored as a source of nutrients in other guanotrophy studies, but we found them to be a more important source of P than faeces. A movement ecology approach complements traditional censuses and facilitates the study of guanotrophication in multiple ways, including identification of sources of nutrients, correction of censuses, and measuring time spent at roost sites.

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“…La explotación de este tipo de recursos (abundantes y predecibles en el tiempo) ha propiciado a menudo cambios notables en el comportamiento y dinámica de las poblaciones que los utilizan w y (Steigerwald et al, 2015;Castège et al, 2016;Gilbert et al, 2016). Por ejemplo, varias especies de gaviotas en todo el mundo han incrementado el tamaño de sus poblaciones muy significativamente (Olsen & Larson, 2004).…”

Section: Introductionunclassified

Uso del espacio por adultos de gaviota patiamarilla Larus michahellis Naumann, 1840 durante el periodo reproductor: resultados preliminares en relación al uso de vertederos.

Arizaga¹,

Laso²,

Zorrozua³

et al. 2017

Munibe, Cienc. nat.

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ResumenEn la actualidad, con el progresivo cierre de vertederos, nos situamos en un marco experimental ideal para estudiar cómo afecta la reducción drástica de un recurso trófico en la ecología, dinámica poblacional y movimientos de una especie con alto interés en la gestión, como es la gaviota patiamarilla Larus michahellis Naumann, 1840. En este contexto, en 2016 se equiparon con GPS un total de 10 ejemplares adultos de gaviota patiamarilla en una de las colonias de cría de Gipuzkoa, de los que sólo 4 proporcionaron datos hasta el 31.07.2016. El análisis preliminar aporta información básica sobre el uso del territorio durante una parte del periodo reproductor. El porcentaje de localizaciones se distribuyó de esta manera: 60% en la colonia; 18% en otro tipo de hábitats; 12% en prados y cultivos; y 6.5% en vertederos. Se detecta, así, un relativo alto uso de los prados y cultivos del entorno de la colonia, así como de dos de los vertederos más importantes de la región. Por otro lado, parece existir alta variabilidad individual en el uso del territorio que podría reflejar diferentes estrategias en la búsqueda de alimento.Palabras clave: Dispositivos GPS, ecología espacial, especies oportunistas, Gipuzkoa, vertederos. AbstractToday, the progressive closure of landfills provides a good opportunity to study how this affects the drastic reduction of a food resource on the ecology, population dynamics and movement patterns of opportunistic species, such as the yellow-legged gull Larus michahellis Naumann, 1840. Against this background, in 2016, we captured 10 adult breeding gulls in one of the main breeding colonies in Gipuzkoa. These individuals were equipped with a GPS device. Only four of them provided data up to the end of the breeding period (31.07.2016). Preliminary analyses provide basic information about spatial use and trophic habitat during the breeding period (colony: 60%; other habitat types: 18%; grasslands/crops: 12%; dumps: 6,5%). An apparently relatively high use of grasslands and crops is confirmed, as well as the use of two of the largest landfills in the region. We also observed a very high individual variation in territory use, which might reflect different foraging strategies.Key words: GPS device, spatial ecology, opportunistic species, Gipuzkoa, dumps. LaburpenaEgun, urratsez urrats zabortegiak ixten ari direlarik, testuinguru esperimental ezin hobean gaude ikertzeko nola eragiten dion baliabide trofiko baten erabateko murrizketak maila ekologikoan, populazio dinamikan eta mugimenduetan, baliabide horren kudeaketarekin lotura handia duen kaio hankahoriari, Larus michahellis Naumann, 1840.

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Colonization of the Yellow-legged gull in the southeastern Bay of Biscay and efficacy of deterring systems on landfill site

Cited by 9 publications

References 31 publications

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Local use of landfills by a yellow‐legged gull population suggests distance‐dependent resource exploitation

Quantifying nutrient inputs by gulls to a fluctuating lake, aided by movement ecology methods

Uso del espacio por adultos de gaviota patiamarilla Larus michahellis Naumann, 1840 durante el periodo reproductor: resultados preliminares en relación al uso de vertederos.

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