Tide Associated Incubation and Foraging Behaviour of Saunders's Gulls<i>Larus saundersi</i>

Yoon, Jongmin; Yoon, Hyun-Ju; Go, Bong-Gun; Joo, Eun-Jin; Park, Shi‐Ryong

doi:10.5253/078.101.0204

Cited by 5 publications

(2 citation statements)

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“…Additionally, adults may not be able to access prey items evenly throughout all periods of the day. For instance, Saunders's Gulls (Chroicocephalus saundersi), which feed on mudflats, have been found to increase incubation with higher sea levels regardless of time of day suggesting a tradeoff between incubation and temporal food availability (Yoon et al 2014).…”

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confidence: 99%

Assessing nest attentiveness of Common Terns via video cameras and temperature loggers

et al. 2020

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Background: While nest attentiveness plays a critical role in the reproductive success of avian species, nest attentiveness data with high temporal resolution is not available for many species. However, improvements in both video monitoring and temperature logging devices present an opportunity to increase our understanding of this aspect of avian behavior. Methods: To investigate nest attentiveness behaviors and evaluate these technologies, we monitored 13 nests across two Common Tern (Sterna hirundo) breeding colonies with a paired video camera-temperature logger approach, while monitoring 63 additional nests with temperature loggers alone. Observations occurred from May to August of 2017 on Poplar (Chesapeake Bay, Maryland, USA) and Skimmer Islands (Isle of Wight Bay, Maryland, USA). We examined data respective to four times of day: Morning (civil dawn-11:59), Peak (12:00-16:00), Cooling (16:01-civil dusk), and Night (civil dusk-civil dawn). Results: While successful nests had mostly short duration off-bouts and maintained consistent nest attentiveness throughout the day, failed nests had dramatic reductions in nest attentiveness during the Cooling and Night periods (p < 0.05) with one colony experiencing repeated nocturnal abandonment due to predation pressure from a Great Horned Owl (Bubo virginianus). Incubation appeared to ameliorate ambient temperatures during Night, as nests were significantly warmer during Night when birds were on versus off the nest (p < 0.05). Meanwhile, off-bouts during the Peak period occurred during higher ambient temperatures, perhaps due to adults leaving the nest during the hottest periods to perform belly soaking. Unfortunately, temperature logger data alone had limited ability to predict nest attentiveness status during shorter bouts, with results highly dependent on time of day and bout duration. While our methods did not affect hatching success (p > 0.05), video-monitored nests did have significantly lower clutch sizes (p < 0.05). Conclusions: The paired use of iButtons and video cameras enabled a detailed description of the incubation behavior of COTE. However, while promising for future research, the logistical and potential biological complications involved in the use of these methods suggest that careful planning is needed before these devices are utilized to ensure data is collected in a safe and successful manner.

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Assessing nest attentiveness of Common Terns via video cameras and temperature loggers

et al. 2020

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“…Avian predation in intertidal and shallow subtidal zones is reported to be influenced by the tidal level and tidal cycle (Dominguez, ; Matsunaga, ; Yoon, Yoon, Go, Joo, & Park, ). In the present study, no clear relationship was confirmed between the average tidal level and the predation rate by the gull on the abalone in the late afternoon when the predation by the gull on the abalone was most active.…”

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Predation by the gull Larus crassirostris on benthic invertebrates: First report of avian predation on the abalone Haliotis discus hannai

Ito

Kawamura

2018

Marine Ecology

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We conducted field surveys to study avian predation on invertebrates inhabiting the intertidal and shallow subtidal zones in Otsuchi Bay on the Sanriku Coast. The black‐tailed gull Larus crassirostris was the most frequently observed avian predator, and we observed the gull actively foraging on benthic invertebrates at the study site. In particular, we found frequent predation activities by the black‐tailed gull on the abalone Haliotis discus hannnai. The abalone accounted for 56.3% of the total amount of the prey remains, and the sea urchin Strongylocentrotus intermedius and mussel Mytilus galloprovincialis were also major components of the prey remains and accounted for 14.6% and 11.8% of the total number, respectively. While the gull preys on the abalone over a wide size range (27.0–105.7 mm shell length), smaller size class abalone individuals (<40 mm shell length) were dominant in prey remains compared to the live abalone surveyed in the surrounding habitats. Among four time periods in a day, predation rate on the abalone was highest in the late afternoon. Predation rate on the abalone was higher on rising tides than falling tides, although no clear relationship was confirmed between the predation rate and the tidal height. The predation by the black‐tailed gull might have large impacts on the shallow rocky reef ecosystem.

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Does Nest Predation Influence Colony Movements of Saunders's Gulls (Saundersilarus saundersi) in a Reclaimed Land Area?

Yoon

Joo

et al. 2018

Zoological Science

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Tide Associated Incubation and Foraging Behaviour of Saunders's GullsLarus saundersi

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 5 publications

References 23 publications

Assessing nest attentiveness of Common Terns via video cameras and temperature loggers

Assessing nest attentiveness of Common Terns via video cameras and temperature loggers

Predation by the gull Larus crassirostris on benthic invertebrates: First report of avian predation on the abalone Haliotis discus hannai

Does Nest Predation Influence Colony Movements of Saunders's Gulls (Saundersilarus saundersi) in a Reclaimed Land Area?

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