Feeding Activity of the Grey Heron Ardea cinerea in Tidal and Non-tidal Environments

Sawara, Yuji; Azuma, Nobuyuki; Hino, Kimiaki; Fukui, Kaoru; Demachi, Gen; Sakuyama, Muneki

doi:10.3838/jjo.39.45

Cited by 16 publications

(12 citation statements)

References 5 publications

(6 reference statements)

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“…The results of this study showed that the grey heron has a tendency to avoid deep water 294 and foraging in the middle of day and night. In contrast, it previously was reported that grey 295 herons forage constantly during the daytime (Richner 1986; Sawara et al 1990), so human 296 activities (Klein, 1993) and other feeding sites (Richner 1986) in the surrounding environment 297 could have had an effect on the observed behavior. Grey herons infrequently forage at night, and 298 it has been suggested that such feeding behavior is inefficient (Sawara et al 1990).…”

Section: Statistical Analyses 161mentioning

confidence: 89%

Predation of stocked salmon by riparian wildlife in semi-natural stream

Miyamoto

Squires

Araki

2017

Preprint

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Predation after release is one of the major concerns of hatchery fish 11 conservation and propagation. However, the relationship among the size of hatchery fish, the 12 predator species, and their behaviors in natural environments is largely unknown. To understand 13 the relationship, we conducted predation experiments in outdoor tanks and a semi-natural stream 14 with exposure to local predators. Two different ranges of fork lengths of masu salmon 15 (Oncorhynchus masou) were examined as prey sizes. Camera trap data showed that grey herons 16 (Ardea cinerea) were the primary predator animal in the system, and that most herons utilized 17 shallow areas in the morning or evening. Increasing the density of stocked salmon brought in 18 more grey herons. More importantly, predation by grey herons resulted in the survival rate of 19

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Section: Statistical Analyses 161mentioning

confidence: 89%

Predation of stocked salmon by riparian wildlife in semi-natural stream

Miyamoto

Squires

Araki

2017

Preprint

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“…Sawara et al [21] and Sawara [22] estimated predation rates on fish by herons. The estimates were 5.88-10.5 and 18.06 in the tideland/reservoir of Aomori prefecture, Japan [21], and in the estuary of England [22], respectively.…”

Section: Discussionmentioning

confidence: 99%

“…The estimates were 5.88-10.5 and 18.06 in the tideland/reservoir of Aomori prefecture, Japan [21], and in the estuary of England [22], respectively. These predation rates were larger than the estimates in the present study (0-6.68).…”

Section: Discussionmentioning

confidence: 99%

Quantitative estimation of the predation of marine ranched striped jack Pseudocaranx dentex by herons

Nibe¹,

Suzuki

Sakiyama

et al. 2010

Fish Sci

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The Goto station of the Japan Sea-Farming Association conducted marine ranching experiments with striped jack Pseudocaranx dentex from 1988 to 1999 in the Goto Islands, Nagasaki, Japan. Marine ranching is a stocking method where released fish are fed for some period after release in order to decrease initial mortality from starvation. Ranched fish were fed for 0, 90, and 15 days after stocking in 1997, 1998, and 1999, respectively. During the experiment, herons (grey heron Ardea cinerea, black-crowned night heron Nycticorax nycticorax, and great egret Egretta alba) were often observed preying on released fish in the ranching area. The present study estimated the number of fish preyed upon by herons during observation periods in 1997, 1998, and 1999 from the number of herons that flew into the ranching area and the predation rate on ranched fish by herons. The former was counted during sightings. The latter was estimated from the sighting observations and heron regurgitations. The number of herons that flew into the ranching area increased with the feeding period. The numbers of fish lost to predation by herons in 1997, 1998, and 1999 were estimated to be 0, 5,741, and 829, respectively.

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“…Diurnal animals that forage tidally may need to be able to feed at night occasionally. For example, at low tides, most species of shorebirds in a tidal lagoon foraged with comparable frequency during the day or at night (Robert et al, 1989), and Grey Herons Ardea cinerea arrived to feed at low tides early in the morning before sunrise (Sawara et al, 1990). Great Blue Herons A. herodias and Black-crowned Night Herons Nycticorax nycticorax fed during low tides after sunset in a salt marsh (Black and Collopy, 1982).…”

mentioning

confidence: 98%