Sentences with phrase «by abiotic»

Bottom - up processes are generally driven by the abiotic conditions required for primary producers to grow, such as availability of light and nutrients, and the subsequent transfer of energy to consumers at higher trophic levels.

Unexpected fungal communities in the Rehai thermal springs of Tengchong influenced by abiotic factors — Kai - Hui Liu — Extremophiles

This suggests that the changes were caused by biological processes rather than by abiotic differences in, for example weather conditions.

«This association between the worm and the fungus can be affected by abiotic and biotic factors in the field,» Mathew pointed out.

Not exact matches

IRRI is breeding new rice varieties with better tolerance or resistance to biotic and abiotic stresses — particularly blast, sheath rot, cold temperatures, salinity, and iron toxicity — while maintaining the high quality grain preferred by consumers.

Further calculations by Catling and his team conclude that no abiotic methane sources on a rocky planet could produce enough of the gas to counteract this process — whether it is volcanic outgassing from a planet's interior, chemical reactions in hydrothermal vents, even asteroid impacts.

Funghi et al., however, found that in waxbills, bill color — a trait that can change quickly — is not the result of predetermined sexual differences, aggression, or sexual selection, but rather appears to be influenced by changes in the abiotic environment.

Life must channel and use energy much more quickly than abiotic processes in order to be alive, and that's what we're looking for: something that markedly distinguishes life from nonlife by how much energy it seems to be using.

Work on methane is close to yielding a tool for distinguishing gas made by microbes from «abiotic» methane made from mineral reactions deep in Earth.

It covers all infectious agents that attack plants and abiotic disorders, but does not include herbivory by insects, mammals, etc..

The abiotic or physical environment is also part of the niche because it influences how populations affect, and are affected by, resources and enemies.

These findings suggest that historical milking grounds represent an alternative stable state, maintained by a number of processes, including increased nutrient cycling rates, soil biotic and abiotic processes, and selective feeding on shrubs by lemmings and voles, which prevent the surrounding vegetation from invading in the historical milking grounds.

I have always been intrigued by the complexity of ecosystems and the relationship between biotic and abiotic components.

More generally, stromatolitic laminate structures themselves as well as the putative cellular structures and molecular signatures they sometimes contain have been and remain controversial, since they can be explained by either biogenic or abiotic processes (Grotzinger, 1999).

The concepts of stomatal regulation (i.e. what Mike & Timothy were mentioning above) and how plant growth is influenced by climatic and abiotic factors is discussed in several places in the TAR, see eg.

I was surprised that Rex Tillerson believes the Russian's «abiotic theory» of oil creation, being the theory for the uninitiated that oil is created by geological pressure squeezing rocks deep in the earths crust.

In the absence of that ion supply, abiotic CO2 uptake in the ocean as a function of CO2 in air is at least somewhat limited by ions already present; acification can (over time) dissolve carbonate minerals that supply cations and carbonate ions, buffering pH and reacting with CO2 to form bicarbonate ions; new cations from chemical weathering have to be supplied to actually remove C from the oceans while keeping pH from dropping and without releasing as much CO2 from bicarbonate ions).

This structurally complex mosaic of open woodland characterized by thickets of tree - sized [taller than six feet] individuals of deciduous broad - leaved taxa has the potential of significantly altering abiotic and biotic conditions within the Low Arctic....

This comes from a complete misunderstanding of ecology and the roles played by various abiotic factors in driving different processes over variable scales of space and time.

Oxidation by the introduction of air into a wastewater is an effective abiotic method to reduce BOD levels.