Kinetik des Ingestaflusses bei Rehen (Capreolus capreolus) und Mufflons (Ovis ammon musimon) im saisonalen Verlauf

Behrend, Anke

doi:10.18452/14317

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1999

DOI: 10.18452/14317

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Kinetik des Ingestaflusses bei Rehen (Capreolus capreolus) und Mufflons (Ovis ammon musimon) im saisonalen Verlauf

Anke Behrend¹

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Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification

Clauss

Lechner‐Doll

2001

Oecologia

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The measurement of passage rate is important for the concept of ruminant diversification. While supporters of Hofmann's 1989 feeding type classification claim that browsing ruminants have faster passage rates than grazing ruminants, other researchers consider the passage rate to depend on body size alone. To date, no convincing comparison of ruminant passage rates has been put forward. For comparative purposes, we suggest the use of the "selectivity factor", which is an expression of how much longer particles of a defined size (<2 mm) are retained in the ruminant digestive tract than fluids. From the limited data available, it seems that grazing ruminants display selectivity factors between 1.56 and 3.80, whereas browsers have a much narrower range of 1.14-1.80. This suggests that browsers are not able to selectively retain particles as long as grazers. Intake of browsers, on the other hand, may not be limited by physical fill of the forestomach to the same degree as in grazers. This result can explain several observations on the digestive physiology of browsers, some of which have been linked to a rumen bypass mechanism. We propose that the ability for selective particle retention is a key factor for understanding the physiological consequences of ruminant diversification.

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Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification

Clauss

Lechner‐Doll

2001

Oecologia

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Dispersal of vascular plants by game in northern Germany. Part I: Roe deer (Capreolus capreolus) and wild boar (Sus scrofa)

Schmidt¹,

Sommer

Kriebitzsch³

et al. 2004

Eur J Forest Res

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The endozoochorous and epizoochorous dispersal of vascular plant species by roe deer (Capreolus capreolus) and wild boar (Sus scrofa) was investigated in forest areas of Schleswig-Holstein and Lower Saxony, Germany. The primary aim of this study was to learn about which plant species and in what numbers diaspores are dispersed by the two wild ungulate species. In particular, the significance of zoochory for species composition and biodiversity of forests was evaluated. Fresh faecal pellets were collected from April-November 2001 in the forests of the two study areas. In addition, the coats and hooves of shot roe deer and wild boar were brushed out. The number of viable seeds was determined by greenhouse germination (seedling emergence method). The samples were spread in trays over sterilized soil from the study forests and were kept under controlled conditions in the greenhouse for 12 months. A total of 2,473 individuals from 77 vascular plant species were recorded. While roe deer exceeded wild boar concerning seed contents in the faeces, the significance of roe deer for epizoochorous dispersal was relatively low compared with wild boar. An analysis of the habitat preference of the vascular plant species dispersed by the two ungulate species revealed a high proportion of species growing in forests as well as in the open landscape, and also of non-forest species, while woody plants and herbaceous species closely tied to forest habitats were severely underrepresented. We also discuss consequences for forest ecology and nature conservation.

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Suitability of synthetic alkanes as markers for the estimation of passage rate in sheep

et al. 2008

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Kinetik des Ingestaflusses bei Rehen (Capreolus capreolus) und Mufflons (Ovis ammon musimon) im saisonalen Verlauf

Cited by 3 publications

References 0 publications

Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification

Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification

Dispersal of vascular plants by game in northern Germany. Part I: Roe deer (Capreolus capreolus) and wild boar (Sus scrofa)

Suitability of synthetic alkanes as markers for the estimation of passage rate in sheep

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