Seasonal change and interspecific comparison of foraging behavior in two heron species

Takaki, Yoshihide; Eguchi, Katsumi

doi:10.2326/1347-0558(2008)7[93:scaico]2.0.co;2

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…g . the grey heron Ardea cinerea and intermediate egret Ardea intermedia ) increases at a depth of ≤250 mm (Tojo, ; Takaki & Eguchi, ). Furthermore, aquatic vegetation may provide protection from both aquatic and aerial predators (Devore & White, ; Helfman, ; McMahon & Hartman, ).…”

Section: Discussionmentioning

confidence: 99%

“…Although shallow water may provide protection from aquatic predators (Williams & Coad, 1979), predation pressure from aerial predators (e.g. the grey heron Ardea cinerea and intermediate egret Ardea intermedia) increases at a depth of ≤250 mm (Tojo, 1996;Takaki & Eguchi, 2008). Furthermore, aquatic vegetation may provide protection from both aquatic and aerial predators (Devore & White, 1978;Helfman, 1981;McMahon & Hartman, 1989).…”

Section: H O S T M U S S E L D I S T R I B U T I O N a N D H A B I Tamentioning

confidence: 99%

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Life history and reproductive ecology of the endangered Itasenpara bitterling Acheilognathus longipinnis (Cyprinidae) in the Himi region, central Japan

Nishio

Kawamoto

Kawakami³

et al. 2015

Journal of Fish Biology

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The life history, reproductive ecology and habitat utilization of the Itasenpara (deepbody) bitterling Acheilognathus longipinnis were investigated in a lowland segment of the Moo River in Toyama Prefecture, central Honshu, Japan. Analysis of 1285 individuals revealed that the study population comprised a single size class, an age at maturation of 3 months and a life span of 1 year. On the basis of the growth pattern, the life cycle was divided into two stages: the juvenile stage, characterized by rapid growth, and the adult stage at which growth ceased. Spawning by A. longipinnis was recorded between early September and late October. Female A. longipinnis in the 0+ year age class began to mature when they reached a standard length (LS ) of 56·4 mm. Mature females had a large clutch size (maximum 273 eggs) and deposited highly adhesive and relatively large eggs (2·55 mm(3) ; major axis, 3·12 mm; minor axis, 1·22 mm) via a short ovipositor (mean length, 21·5 mm) into freshwater mussels. The embryos remained in the gill cavities of the freshwater mussels (used as a spawning substratum) and emerged as juveniles (LS , 9 mm). Habitat utilization during spawning was analysed using a generalized linear model. The best-fit model showed that three environmental factors (freshwater mussel availability, water depth and vegetation cover) were important variables for habitat utilization by A. longipinnis. Shallow areas (water depth, 250-330 mm) created for rice paddy management and areas with an abundance of cover were particularly effective for predator avoidance. These results suggest that maintenance of water level fluctuations corresponding with rice cultivation and the abundance of vegetation on the river bank (particularly avoidance of concrete revetments) is essential for conservation of this species under current practices for rice cultivation in Japan.

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Section: Discussionmentioning

confidence: 99%

Section: H O S T M U S S E L D I S T R I B U T I O N a N D H A B I Tamentioning

confidence: 99%

Life history and reproductive ecology of the endangered Itasenpara bitterling Acheilognathus longipinnis (Cyprinidae) in the Himi region, central Japan

Nishio

Kawamoto

Kawakami³

et al. 2015

Journal of Fish Biology

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Comparative foraging behavior of 3 heron species in small standing-water ecosystems in the arid zone of Oman

Kasprzykowski,

Golawski

2024

Current Zoology

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The composition of assemblages, diet and behaviour of waterbird species with similar ecological features are important aspects in the functioning of aquatic ecosystems. Closely-related animal species often share resources such as space and food in ways that reduce competition, but if the diets of different species strongly overlap, interspecific competition may intensify. This analysis examined behavioural data relating to Great Egret, Little Egret and Squacco Heron in order to explore their foraging efficiencies in rich aquatic habitats in an arid zone during post-breeding movements. The fieldwork was carried out in small estuaries of a wadi on the southern coast of Oman. The frequency of interactions was the highest in Squacco Heron and the lowest in Great Egret. However, the differences in the numbers of inter- and intraspecific interactions between the three species were significant. Activity indices calculated for a five-minute period, i.e. the number of interactions (interaction index) and times of flying and walking (movement index) differed among the three species. The number of successful attacks was the highest in Squacco Heron, while the foraging effectiveness of Great Egret and Little Egret was similar. GLM analysis showed that only the movement index was significant, as it had a positive impact on individual foraging success. Great Egret caught more fish than the other two heron species which, in turn, caught a greater number of smaller prey items, mostly invertebrates. This study shows that heron species in the same rich habitat employ different foraging tactics. In comparison to the other two heron species, the foraging tactics of Squacco Heron seem to be the most susceptible to competition. However, its greater mobility and using different foraging tactics, enhance its foraging success.

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Activity Patterns of Snowy Egrets (Egretta thula) and Great Egrets (Ardea alba):A Seasonal Comparison

Brzorad
¹
,

Maccarone
²

2013

Waterbirds

7
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0

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Seasonal change and interspecific comparison of foraging behavior in two heron species

Cited by 6 publications

References 14 publications

Life history and reproductive ecology of the endangered Itasenpara bitterling Acheilognathus longipinnis (Cyprinidae) in the Himi region, central Japan

Life history and reproductive ecology of the endangered Itasenpara bitterling Acheilognathus longipinnis (Cyprinidae) in the Himi region, central Japan

Comparative foraging behavior of 3 heron species in small standing-water ecosystems in the arid zone of Oman

Activity Patterns of Snowy Egrets (Egretta thula) and Great Egrets (Ardea alba):A Seasonal Comparison

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