Difference in Black-tailed Gull (Larus crassirostris) diet during the breeding season for the last 10 years in the South Sea of Korea

Kwon, Young-Soo; Noh, Hyung Soo; Kim, Miran

doi:10.5141/ecoenv.2013.217

Cited by 11 publications

(3 citation statements)

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“…In our two-year field study, we found that the δ 15 Ns of female parents was significantly higher in 2019 than in 2018. The difference in δ 15 Ns, suggesting a dietary difference of female parents between the years noted in previous studies (Deguchi et al 2004, Kwon et al 2013, could be related to differences in fledging success between the two years. However, despite the fact that diets of the female parents differed between the two years, Hg exposure was not significantly related to any of the reproductive parameters of clutch size, hatching success, or nest success.…”

Section: Discussionmentioning

confidence: 74%

The growth rate of Black-tailed Gull chicks is negatively related to total mercury of female parents on Kabushima (Kabu Island), Japan

Hinako¹,

Shirai²,

Mizutani³

et al. 2023

ACE

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The mercury (Hg) contamination at high concentrations affects the physiological state and behavior of animals, however, the effects of low Hg exposure on avian breeding success and the impact on the growth of chicks that depend on feeding from their parents are unclear. We investigated the effects of maternal Hg concentrations on breeding success in a colony of Blacktailed Gulls (Larus crassirostris) breeding on Kabushima, northeastern Honshu, Japan, in 2018 and 2019. Total Hg concentrations in blood cells in females were 2.48 ug/g dry weight ± 0.55 (1.28-3.28) in 2018 and 2.42 ug/g dry weight ± 0.55 (1.87-3.29) in 2019. In our two-year field study, female parents did not differ in Hg concentrations between two years, but δ15Ns, i.e., the difference in diet, were significantly lower in 2019 than those in 2018. The difference in δ15Ns could be related to difference in fledging success between two years (90% and 40% in 2018 and 2019, respectively). However, the results of this study showed that Hg exposure was not significantly associated with clutch size, hatching success, or nest success in the two years with different diets and was not significantly associated with any reproductive parameters at δ15N. Hg exposure was significantly negatively correlated with chick weight gain (g/day), while blood Hg accumulation in female Black-tailed Gulls was below the threshold for direct effects on breeding success. However, there was no noticeable abnormal behavior when feeding the chicks at their Hg exposure levels, under the current level value. Although the breeding numbers of Black-tailed Gulls are not thought to be declining at colonies around Japan at the moment, Hg contamination may threaten their numbers in the future.Le taux de croissance des poussins de Goélands à queue noire est lié négativement au taux de mercure des parents femelles sur Kabushima (île Kabu), au Japon RÉSUMÉ. La contamination par le mercure (Hg) à des concentrations élevées affecte l'état physiologique et le comportement des animaux. Cependant, les effets d'une faible exposition au Hg sur le succès de reproduction et l'impact sur la croissance des poussins dont l'alimentation dépend des parents ne sont pas clairs. Nous avons examiné les effets de la concentration de Hg contenue dans les femelles sur le succès de reproduction de Goélands à queue noire (Larus crassirostris) nichant en colonie sur Kabushima, au nord-est de Honshu, au Japon, en 2018 et 2019. La concentration de Hg dans les cellules sanguines des femelles était de 2,48 ug/g de poids sec ± 0,55 (1,28-3,28) en 2018 et de 2,42 ug/g de poids sec ± 0,55 (1,87-3,29) en 2019. Au cours des deux ans de notre étude sur le terrain, les concentrations de Hg contenues dans les parents femelles ne différaient pas entre les deux années, mais les δ15N, c'est-à-dire la différence de régime alimentaire, étaient significativement plus faibles en 2019 qu'en 2018. La différence de δ15N pourrait être liée à la différence du succès d'envol entre les deux années (90 % et 40 % en 2018 et 2019, respectivement)...

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Section: Discussionmentioning

confidence: 74%

The growth rate of Black-tailed Gull chicks is negatively related to total mercury of female parents on Kabushima (Kabu Island), Japan

Hinako¹,

Shirai²,

Mizutani³

et al. 2023

ACE

View full text Add to dashboard Cite

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“…1C), but have also infrequently been observed in North America (Heinl 1997), Mexico (Garrett & Molina 1998) and the Philippines (Redman 1993). Although they are resident seabirds that are often seen in coastal seashore areas, they mate and raise their chicks from April-July on nearby isolated islands (Kwon et al 2006), where they feed on small marine fish (Kwon et al 2013).…”

Section: Resultsmentioning

confidence: 99%

The Ornithodoros capensis group (Acari: Argasidae): a morphological diagnosis and molecular characterization of O. capensis sensu stricto from Queimada Grande Island, Brazil

Muñoz-Léal

Dias

Abrahão

et al. 2017

saa

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Ornithodoros capensis sensu lato (s. l.) is a worldwide-distributed group of soft ticks that parasitize birds in insular and continental lands. It is currently composed of 11 morphologically closely related species. Several viral and bacterial pathogens, and particularly Coxiella-like endosymbiont organisms have been described coexisting with ticks of this group. Since it last report in 1983, the presence of O. capensis s. l. in Brazil has remained undocumented. By a morphological analysis of larvae and a molecular characterization of ticks and Coxiella genes we describe for the first time O. capensis sensu stricto in Brazil from specimens collected on Queimada Grande Island, in São Paulo state.

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“…On most of the breeding islands, the flight frequency of the black-tailed gulls tended to decrease during the post-breeding season (August to December, 2021); however, the flight frequency of the gulls breeding on Dongman Island increased during the period (Figure 1). During the breeding period (May to July, 2021), black-tailed gulls primarily rely on floating fish and squid as food sources around their breeding islands [38,39].…”

Section: Discussionmentioning

confidence: 99%

Changes in Flight Altitude of Black-Tailed Gulls According to Temporal and Environmental Differences

Park,

Jeong,

Lee

et al. 2024

Animals

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In this study, GPS trackers were attached to black-tailed gulls (Larus crassirostris) breeding on five islands in Republic of Korea during April and May 2021, and their flight frequency, behavioral range, and flight altitude were compared during and after the breeding season. During the breeding season, the flight frequency was lowest on Dongman Island (28.7%), where mudflats were distributed nearby, and the range of activity was narrow. In contrast, it tended to be high on Gungsi Island (52%), where the breeding colony was far from land, resulting in a wider range of activity. Although the flight frequency on Dongman Island increased post-breeding season (42.7%), it decreased on other islands. The mean flight altitude during the breeding season was lowest on Dongman Island and highest on Napdaegi Island. In most breeding areas, the mean flight altitude during the post-breeding season was higher than that during the breeding season. However, the lead flight altitude was lower during the non-breeding season compared to that in the breeding season. The home range expanded after the breeding season, with no significant difference in lead time between the breeding and non-breeding seasons. Our findings reveal that black-tailed gulls exhibit varying home ranges and flight altitudes depending on season and geographical location. As generalists, gulls display flexible responses to environmental changes, indicating that flight behavior adapts to the evolving environment over time and across regions.

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Difference in Black-tailed Gull (Larus crassirostris) diet during the breeding season for the last 10 years in the South Sea of Korea

Cited by 11 publications

References 10 publications

The growth rate of Black-tailed Gull chicks is negatively related to total mercury of female parents on Kabushima (Kabu Island), Japan

The growth rate of Black-tailed Gull chicks is negatively related to total mercury of female parents on Kabushima (Kabu Island), Japan

The Ornithodoros capensis group (Acari: Argasidae): a morphological diagnosis and molecular characterization of O. capensis sensu stricto from Queimada Grande Island, Brazil

Changes in Flight Altitude of Black-Tailed Gulls According to Temporal and Environmental Differences

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