منابع مشابه
Hercus: Sheep on Tussock Grassland
One important area for which little experimental evidence is available is the snowgrass country. There is a strong body of opinion that in the snowgrass the combined effects of fire and grazing have been responsible for deterioration in vegetative cover and stability. It seems likely that changes in the boundari~s between the snowgrass and fescue communiti~s have been due to, or aggravated by, ...
متن کاملJumping and Non-Jumping Genes
The term ‘horizontal transfer (HT)’ refers to the transfer of genetic material between two reproductively isolated organisms. HT is thought to occur rarely in eukaryotes compared to vertical inheritance, the transmission of DNA from parent to offspring. In a recent study we have provided evidence that a family of DNA transposons, called SPACE INVADERS or SPIN, independently invaded horizontally...
متن کاملO'connor: Pastoralism and Conservation of Tussock: Grasslands
In a cultural-ecological perspective of New Zealand pastoralism the amount and form of energy supplements at different stages of pastoral development are characterized and prospects for sustainability discussed. The history of the pastoral exploitation of the tussock grasslands of South Island, New Zealand is reviewed with particular attention to physiognomic changes brought about by early fire...
متن کاملRecovery of short tussock and woody species guilds in ungrazed Festuca novae-zelandiae short tussock grassland with fertiliser or irrigation
In a Festuca novae-zelandiae short tussock grassland in South Island, New Zealand, we tested the propositions (1) that present regional trends in vascular plant species-richness in tussock grasslands are independent of current pastoral management, and (2) that grazing retards the invasion and dominance of nonnative species, particularly where soil resources are not limiting. Sheep and rabbit-gr...
متن کاملJumping Sequences
An integer sequence a(n) is called a jump sequence if a(1) = 1 and 1 ≤ a(n) < n for n ≥ 2. Such a sequence has the property that ak(n) = a(a(· · · (a(n)) · · · )) goes to 1 in finitely many steps. We call the pattern (n, a(n), a2(n), . . . , al(n) = 1) a jumping pattern from n down to 1. In this paper we look at jumping sequences that are weight minimizing with respect to various weight functio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: British Dental Journal
سال: 2008
ISSN: 0007-0610,1476-5373
DOI: 10.1038/sj.bdj.2008.267