Abstract. Rangeland vegetation dynamics encompass all processes of changes in vegetation composition and structure over time. Investigating the rangeland ecosystem dynamics makes it possible to determine the effects of climatic and management conditions on qualitative and quantitative changes of the vegetation in a specific period of time. Accordingly, data collection and measurements for evalu...

Males and females of the three-spined stickleback, Gasterosteus aculeatus L., were given melatonin injections (0.8 or 4 micrograms/day) at different seasons and under different photoperiods (8L: 16D and 16L: 8D). Long photoperiods stimulated reproduction in November and January, whereas maturation in both sexes in March/April and ovarian regression in July were only negligibly affected by light...

Monitoring of forest cover is an essential tool for sustainable management of natural resources. Woody green cover can better maintained and managed by identification of forest gaps and their subsequent refilling. Forest canopy density mapping is one of the tools used to identify such canopy openings and most useful parameter to consider in the planning and implementation of afforestation and r...

We show that, for any lattice polytope P ⊂ R, the set int(P ) ∩lZ (provided it is non-empty) contains a point whose coefficient ofasymmetry with respect to P is at most 8d · (8l+7)2d+1. If, moreover,P is a simplex, then this bound can be improved to 8 · (8l+ 7)d+1.As an application, we deduce new upper bounds on the volume ofa lattice polytope, given its ...

To understand the biomass condition in the forestry areas, the detection for individual trees becomes an important topic. For forestry management, the canopy may be described with several parameters, e.g., number of stems, stand position, tree height, timber volume, canopy cover, etc. Traditional methods rely on field measurements, imagery, and radar data to derive the canopy information. Follo...

pistachio psylla, agonoscena pistaciae burckhardt & lauterer, is a key pest of pistachio trees in the pistachio-producing regions throughout iran. the investigation of biology of pests under the field condition in each region is the first step that must be taken in developing an integrated pest management program. the seasonal fluctuations of eggs, nymphs and adults of pistachio psylla were inv...

This study was designed to explore the impact of photoperiod on gonadal development and somatic growth Atlantic salmon raised in recirculating aquaculture systems (RASs), with specific focus role that microRNA (miR)-155 plays as a regulator salmon’s photoperiodic reproduction. These were reared for 5 months under six different regimens, including two changing photoperiods (LL–SL = 24L:0D–8L:16D...

The movement of faecal pathogens from land to surface and ground-water are of great interest because of the public and livestock health implications. Knowledge of canopy structure and how it might be managed to help mitigate nutrient and pathogen movement in pasture is needed to create management practices that balance livestock production with environmental benefits. An experiment was conducte...