An analysis of the horizontal burrow morphology of the oriental mole cricket (Gryllotalpa orientalis) and the distribution pattern of surface vegetation

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Abstract:

Food acquisition in animals that construct burrows for foraging is influenced by burrow structure associated with food distribution and searching patterns. The burrowing patterns of the oriental mole cricket (Gryllotalpa orientalis Brumeister, 1838) (Orthoptera: Gryllotalpidae) were investigated based on analyses of the relation between burrow morphology and plant distribution. To assess differences between horizontal burrows (HB) with and without vertical burrows (VB), the number of branching points, the length of the horizontal parts, the plant ratio of the burrow area, and the burrow fractal dimension were compared. The size of the burrow area was positively related to the degree of branching. Cyperaceae and Gramineae occurred less frequently, whereas Hydrocotyle sibthorpioide Lam. and areas with no plants were more frequent in the burrow area than in the quadrat area. Juncaceae and Persicaria thunbergii (Siebold and Zucc.) H. Gross ex Nakai occurred more frequently and Lindernia crustacea (L.) F. Muell. occurred less frequently in HB without VB than in HB with VB. The ratio of burrow length to the number of branching points was not significantly different between HB with or without VB. HB with VB had a nearly planar structure (higher burrow fractal dimension) than that of HB alone. HB structure and plant composition of the burrow area differed depending on the presence of VB.

L’acquisition de nourriture chez les animaux qui construisent des galeries pour leur quête alimentaire est influencée par la structure de la galerie en relation avec la répartition de la nourriture et les patrons de recherche alimentaire. Nous avons étudié les patrons de creusage de la courtilière orientale (Gryllotalpa orientalis Burmeister, 1838) (Orthoptera: Gryllotalpidae) d’après des analyses de la relation entre la morphologie de la galerie et la répartition des plantes. Pour établir les différences entre les galeries horizontales (HB) avec et sans galeries verticales (VB), nous avons déterminé le nombre de points de bifurcation, la longueur des sections horizontales, le rapport des plantes dans la zone des galeries et la dimension fractale des galeries. L’étendue de la zone des galeries est en relation positive avec le nombre de bifurcations. Dans la zone des galeries, les Cyperaceae et les Gramineae sont moins abondants, alors que Hydrocotyle sibthorpioide Lam. et les surfaces dénudées sont plus fréquents que dans les aires des quadrats. Les Juncaceae et Persicaria thunbergii (Siebold and Zucc.) H. Gross ex Nakai sont plus fréquents et Lindernia crustacea (L.) F. Muell. moins commun dans les zones de galeries HB sans VB que dans les zones de galeries HB avec VB. Le rapport de la longueur de la galerie sur le nombre de points de bifurcation n’est pas significativement différent dans les galeries HB avec ou sans VB. Les galeries HB avec VB possèdent une structure presque planaire (dimension fractale de la galerie plus élevée) par rapport aux galeries HB seules. La structure des galeries HB et la composition végétale de la zone de la galerie diffèrent selon la présence ou non de galeries VB.

Document Type: Research Article

Publication date: November 1, 2008

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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