Zur Abundanz- und Biomassendynamik der Tiere in Buchenwäldern des Solling

Schauermann, J.

doi:10.1007/978-94-011-5957-9_11

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Studies on Curculionidae (Schauermann 1976), aphids (Way and Cammell 1971), Amphipoda (Enright 1976), parasitic worms (Holmes 1961(Holmes , 1962, freshwater snails (MooyVogclaer et al 1970), and land snails (Wolda 1969;Oosterhoff 1977) all reveal that denser populations have smaller individuals. It is important to note that no predators are present amongst these organisms.…”

Section: Discussionmentioning

confidence: 97%

On reduced size in spiders from marginal habitats

Jocqué¹

1981

Oecologia

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Four heathland spider species, Agroeca proxima, Centromerita concinna, Theridion simile, and Philodromus histrio, were studied in the Kalmthout National Nature Reserve in northern Belgium. They were caught by pitfall trapping or sweeping in different Calluna heath plots where the vegetation was in varying stages of development after being burnt, mowed, or grazed. Each species proved to thrive in a different plot, its numbers being greater and its size larger (cephalothorax width) in that plot. For the first two species positive correlations were found, for males as well as for females, between average size and numbers caught during a complete year cycle in a particular habitat.In contrast to non-predators, which are smaller when their populations are denser, spiders show a functional response that explains their increase in size with increasing density. It is suggested that in this respect a fundamental difference exists between predators and non-predators.

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Section: Discussionmentioning

confidence: 97%

On reduced size in spiders from marginal habitats

Jocqué¹

1981

Oecologia

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The Deciduous Forest

Marcuzzi¹

1979

European Ecosystems

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Biological decomposition efficiency in different woodland soils

Herlitzius

1983

Oecologia

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The decomposition (meaning disappearance) of different leaf types and artificial leaves made from cellulose hydrate foil was studied in three forests - an alluvial forest (Ulmetum), a beech forest on limestone soil (Melico-Fagetum), and a spruce forest in soil overlying limestone bedrock.Fine, medium, and coarse mesh litter bags of special design were used to investigate the roles of abiotic factors, microorganisms, and meso- and macrofauna in effecting decomposition in the three habitats. Additionally, the experimental design was carefully arranged so as to provide information about the effects on decomposition processes of the duration of exposure and the date or moment of exposure. 1. Exposure of litter samples oor 12 months showed: a) Litter enclosed in fine mesh bags decomposed to some 40-44% of the initial amount placed in each of the three forests. Most of this decomposition can be attributed to abiotic factors and microoganisms. b) Litter placed in medium mesh litter bags reduced by ca. 60% in alluvial forest, ca. 50% in beech forest and ca. 44% in spruce forest. c) Litter enclosed in coarse mesh litter bags was reduced by 71% of the initial weights exposed in alluvial and beech forests; in the spruce forest decomposition was no greater than observed with fine and medium mesh litter bags. Clearly, in spruce forest the macrofauna has little or no part to play in effecting decomposition. 2. Sequential month by month exposure of hazel leaves and cellulose hydrate foil in coarse mesh litter bags in all three forests showed that one month of exposure led to only slight material losses, they did occur smallest between March and May, and largest between June and October/November. 3. Coarse mesh litter bags containing either hazel or artificial leaves of cellulose hydrate foil were exposed to natural decomposition processes in December 1977 and subsampled monthly over a period of one year, this series constituted the From-sequence of experiments. Each of the From-sequence samples removed was immediately replaced by a fresh litter bag which was left in place until December 1978, this series constituted the To-sequence of experiments. The results arising from the designated From- and To-sequences showed: a) During the course of one year hazel leaves decomposed completely in alluvial forest, almost completely in beech forest but to only 50% of the initial value in spruce forest. b) Duration of exposure and not the date of exposure is the major controlling influence on decomposition in alluvial forest, a characteristic reflected in the mirror-image courses of the From- and To-sequences curves with respect to the abscissa or time axis. Conversely the date of exposure and not the duration of exposure is the major controlling influence on decomposition in the spruce forest, a characteristic reflected in the mirror-image courses of the From-and To-sequences with respect to the ordinate or axis of percentage decomposition. c) Leaf powder amendment increased the decomposition rate of the hazel and cellulose hydrate leaves ...

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Zur Abundanz- und Biomassendynamik der Tiere in Buchenwäldern des Solling

Cited by 3 publications

References 8 publications

On reduced size in spiders from marginal habitats

On reduced size in spiders from marginal habitats

The Deciduous Forest

Biological decomposition efficiency in different woodland soils

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