Human alteration of natural light cycles: causes and ecological consequences

Human Alteration of the Global Nitrogen Cycle: Causes and Consequences

SUMMARY Human activities are greatly increasing the amount of nitrogen cycling between the living world and the soil, water, and atmosphere. In fact, humans have already doubled the rate of nitrogen entering the land-based nitrogen cycle, and that rate is continuing to climb. This human-driven global change is having serious impacts on ecosystems around the world because nitrogen is essential t...

Causes and Consequences of Male Infertility

Introduction: Infertility has various and innumerable causes, which pointing them out one by one is difficult and out of the scope of this paper. Infertility causes are different between males and females, and each case requires a separate and thorough research. The present study aimed to identify the male infertility causes. Methods: This study was conducted using a qualitative method, which ...

Heterogeneity of light environment and its ecological consequences

Human Alteration of the Global Nitrogen Cycle: Sources and Consequences

Nitrogen is a key element controlling the species composition, diversity, dynamics, and functioning of many terrestrial, freshwater, and marine ecosystems. Many of the original plant species living in these ecosystems are adapted to, and function optimally in, soils and solutions with low levels of available nitrogen. The growth and dynamics of herbivore populations, and ultimately those of the...

Ecological optics of natural materials and light fields

The appearance of objects in scenes is determined by their shape, material properties and by the light field, and, in contradistinction, the appearance of those objects provides us with cues about the shape, material properties and light field. The latter so-called inverse problem is underdetermined and therefore suffers from interesting ambiguities. Therefore, interactions in the perception of...