Arracacia xanthorrhiza Bancroft
... is far more important economically than other Andean roots and tubers. Their
combined value is probably exceeded by arracacha alone.
Although it is little known that arracacha was introduced to Brazil, in the
southern states of this country it now probably covers a larger area than in any
Andean cou ...
Investigating the life history strategy of an African savanna tree
... Firstly, I would like to thank my supervisor, Prof Ed. Witkowski for his unwavering support and
confidence in my abilities. He was always available for quick chats and drafts of chapters came
back with detailed comments and helpful suggestions very quickly. His mentorship throughout my
PhD experienc ...
Microbial mobilization and immobilization of soil nitrogen
... concentration of compounds such as organic acids are relatively low (Hongve et al.,
2000; Strobel, 2001), and if these are considered to be the substrate for
microorganisms, the use of first order kinetics might be justified. To my knowledge,
no studies have verified the assumption that the concentr ...
Context dependency in acorn predation and dispersal Apodemus sylvaticus
... organisms. Plant-animal interactions are a paradigmatic example of such ecological
relationships, from antagonistic to mutualistic relationships, although determining its result
might be difficult, like in the case of seed dispersal by rodents. Many rodent species are avid
seed consumers, but also a ...
Food Web Responses to Augmenting
... first on fibrous roots and later on the cortex of major
roots. Wounding of the major roots by these insects
facilitates infection by Phytophthora spp. The resulting
pest-disease complex can kill trees, and orchards are
sometimes abandoned within several years after the insect is first detected. Mana ...
Ecological functions of earthworms in soil - Wageningen UR E
... reproductive rate, and habitat preferences. To make sense of this variety,
ecologists often divide them into three groups based on Bouché (1977): (i)
“anecic”, large species that dig and inhabit upright, deep burrows in soil, and
come to the surface to feed on detritus*; (ii) “epigeic”, small and fa ...
Artificial Regeneration of Major Oak (Quercus) Species
... vigor were positively correlated with seed dry mass. Kleinschmit and Svolba (1979) reported strong positive correlation between acorn weight and height growth of English oak
(Quercus robur L.) and Durmast oak (Quercus petraea
[Matt.] Liebl.) in Germany. Elsewhere, Bonfil (1998) observed that acorn m ...
Soil macrofauna field manual – technical level
... Soil organisms are an integral part of agricultural ecosystems. The presence of a
range of a diverse community of soil organisms is essential for the maintenance of
productive soils. Soil organisms are responsible for a range of ecological functions
and ecosystem services including: nutrient cycling ...
asian elephants are essential as seed dispersers in a
... dung is unlikely to negate elephants’ role in their dispersal. Seeds taken from elephant dung
germinated as well or better than seeds from bovid dung or directly from fruit. Elephants were
calculated to move seeds up to 10 times as far as domestic bovids. An empirical probability
model estimated tha ...
bc grasslands stewardship guide.indd
... he beauty and diversity of BC’s grasslands
are unique. Grasslands are home to everything from lichen to curlews, salamanders to cacti,
sharp-tailed grouse to elk. Visitors and residents use
the grasslands for recreation. The cattle industry
depends on healthy grasslands to help provide a secure
PC 222 Final report 2005
... such as Japan – biological control systems are in general less well-developed
than in Western Europe, and furthermore, utilise native biological control
agents (BCAs) which are both unavailable and unregistered in the UK. In
other words, they would be classified as non-native organisms in the UK, th ...
Restoring Wyoming Big Sagebrush
... sagebrush seedings in areas with exotic annual grass competition have had little success (Meyer 2003). Competitive
effects are probably related to the inability of sagebrush
seedlings to compete for soil moisture during establishment
(Cook and Lewis 1963; Sturges 1977). Blaisdell (1949) found
Acaricides – Biological Profiles, Effects and Uses in
... of acaricidal compounds acting on mitochondrial respiration process, that produces most of
the energy in cells. This process includes two coupled parts: mitochondrial electron
transport (MET) and oxidative phosphorylation. Although some of the older acaricides were
known to inhibit respiration, the ...
Pest Management Plan - Lockyer Valley Regional Council
... pests within Lockyer Valley Regional Council Local Government Area and prioritises their control.
Declared Pests under the Land Protection (Pest and Stock Route Management) Act 2002 are plants or animals that
cause significant adverse economic, environmental and social impacts. They reduce industry ...
Alfalfa Trap Cropping Increases Abundance Of Key Arachnids In An
... natural enemies to reduce exotic pest densities below levels that are deleterious to crops.
The key to success for classical biological control is efficient dispersion and reproductive
capabilities of predators (Van Lenteren et al. 2012). Perennial crops (e.g., fruit
plantations and forests) have be ...
... Number of plants with >25 seeds in storage: According to the plant stabilization plans, for taxa
where seed storage is the preferred genetic storage method, up to 50 seeds should be collected
from each plant for storage. Because it is in the early stages of implementation, NRS felt it was
DOCX version 3874 KB - Office of the Gene Technology Regulator
... Canola is grown primarily as an oilseed, from which oil is extracted. The oil is used
for cooking and in food products such as margarine. Canola seeds yield 35-45% oil. A
by-product of the oil extraction process is the generation of a high-protein meal that
may be used as animal feed. Worldwide, can ...
Ready or Not, Garlic Mustard Is Moving In: Alliaria
... soils that were previously occupied by garlic mustard. To test
for the specific effects of root exudates, they mixed experimental soil samples with activated carbon, a substrate that
binds organic compounds in soil and thereby decreases their
activity. They found that more seeds germinated in soils ...
... plants related to the MIP. NRS have reached capacity in the current space. The nursery space
was planned for the Pahole Mid-Elevation Nursery owned by the State of Hawai‘i. The Army
and the State have been working to overcome a number of planning, permitting, budgetary,
staffing changes and logistic ...
The Biology of Ananas comosus (Pineapple)
... assessments of genetically modified (GM) A. comosus that may be released into the
In this document, pineapple is used to refer to A. comosus and its cultivars, and to
hybrids of A. comosus with other varieties.
A. comosus is a tropical, herbaceous, perennial monocot, approxim ...
stages and spatial scales of recruitment limitation in - Sortie-ND
... and Pickett 1990, Alvarez-Buylla and Garcı́a-Barrios
1991, Houle 1992a).
Unfortunately, appreciation that recruitment limitation can occur does not remove the obstacle that caused
many to ignore it in the first place: lack of characterization methods. Most efforts to quantify seed production and dis ...
Soil health in agricultural systems
... example via the provision of surface charges, expressed
as the cation exchange capacity, or influencing
hydrological properties such as wettability. However,
while the chemistry (and physics) of the soil system
provides the context, and indeed sets the limits, in
which the biotic assemblages of soil ...
Intermountain Alfalfa Management - Siskiyou County Cooperative
... Climate has a profound effect on alfalfa production. Because of the climate in the Intermountain
Region, dormant varieties of alfalfa (those with a fall
dormancy rating from 2 to 4) prevail there. Growers
can obtain two to four alfalfa cuttings between May
and September (three is the most common num ...
Landscape effects on insect pests of Dracaena marginata
... for Costa Rica (CR) and a significant part of their agricultural landscape. Within the
ornamental plants, Dracaena marginata Lam. (Rusaceae) provides an opportunity to study
the population dynamics of three families of herbivorous arthropods which differ
importantly in terms of their biology: Cicade ...
... the clearing of vegetated areas and soil disturbance.
Revegetation requires the prior establishment of soil conditions suitable for plant growth
through effective management of topsoil and the control of weeds and other site factors.
All plants require water to establish and grow. For most locations ...
Weed control is the botanical component of pest control, which attempts to stop weeds, especially noxious or injurious weeds, from competing with domesticated plants and livestock. Many strategies have been developed in order to contain these plants.The original strategy was manual removal including ploughing, which can cut the roots of weeds. More recent approaches include herbicides (chemical weed killers) and reducing stocks by burning and/or pulverizing seeds.A plant is often termed a ""weed"" when it has one or more of the following characteristics: Little or no recognized value (as in medicinal, material, nutritional or energy) Rapid growth and/or ease of germination Competitive with crops for space, light, water and nutrientsThe definition of a weed is completely context-dependent. To one person, one plant may be a weed, and to another person it may be a desirable plant. In one place, a plant may be viewed as a weed, whereas in another place, the same plant may be desirable.