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Nematode communities in subalpine meadows in Central Pyrenees

100%

Dmowska E.

Annales Zoologici

2000

tom 50

nr 2

Studies were carried out in subalpine meadows in the “Massif Néouvielle” in Central Pyrenees (France). Three habitats differing in humidity, temperature and soil pH were selected: 1 - dry and warm acidic soil, 2 - medium dry, acidic soil, 3 - wet and cold, neutral soil. One hundred and forty nematode species belonging to 7 orders, 21 families and 71 genera were found in studied material. Quantitative parameters: total number, numbers of families and genera of nematode communities from analyzed sites were poorly differentiated. However, great differences were found in composition and structure of studied communities. Dry and warm soil was dominated by nematodes of three orders: Areolaimida (27.02%), Dorylaimida (25.48%) and Tylenchida (24.32%), eudominants being genera: Aporcelaimellus, Paratylenchus and Prismatolaimus. In medium dry soil dominated Tylenchida (44.54%), Areolaimida (17.38%), Rhabditida (14.5%) and eudominants were: Acrobeloides, Rhabdolaimus and Rotylenchus. Enoplida (63.01%) dominated in wet and cold soil and eudominant was Rhabdolaimus. Shannon Index of diversity for genera in dry and warm soil was 3.77, in medium dry 4.24, and in wet and cold soil 3.06. Fourteen species were common for all three sites. Low values of Sørensen’s similarity index (below 40%) show a low similarity at a species level between communities from various sites.

Plant traits response to grazing exclusion by fencing assessed via multiple classification approach: a case from a subalpine meadow

84%

Li W. J. , Liu S. S. , Li J. H. , Zhang R. L. , Rang K. Z. C. , Zhou H. K. , Yao B. Q. , Wang J. F.

Polish Journal of Ecology

2019

tom 67

nr 1

Using multiple classification approach to examine plant traits response to grazing and fencing (as without access to grazing) is rare. Here we used multiple classification approach to examine plant diversity, productivity and species traits response to grazing and fencing over a three-year period on the eastern part of the Qing-Hai Tibetan Plateau. The results showed that most common species response to the fence was poorly noticeable. The fencing meadows compared to those under long-term free grazing are characterized by significantly higher total species richness, but species richness declined with sampling years gradually, regardless of grazing or fencing. The correlation showed that species richness was negatively associated with mean annual temperature significantly, suggesting that abiotic factors (e.g. annual temperature) could also play important roles in driving species richness in this subalpine meadow. Total aboveground biomass was not associated with mean annual temperature and rainfall. The fencing meadow demonstrated higher community aboveground biomass relative to the grazing ones, especially the abundance of legume and graminoids increased, while the proportions of sedge decreased, suggested that grazing disturbance favours the increase of reproductive success of sedge (e.g. Kobresia humilis) in this subalpine meadow. Growth form-based analyses combined with canopy height categories should be recommended to reveal general rules and mechanisms relating to grazing.