We don’t see the organisms in the zone of physiological stress, instead what we see is?

organisms dying
increases in populations
decreases in a particular type of plant species
immigration of invasive species

decreases in populations

In the zone of physiological stress, where conditions are less than ideal for most organisms, we might not actually see the organisms themselves. Instead, we might observe various consequences or indicators of the stress on the ecosystem. These can include:

1. Organisms dying: The stress might lead to increased mortality rates, causing organisms to die off. This can manifest as dead organisms found in the affected area.

2. Decreases in a particular type of plant species: Certain plant species may be more sensitive to stress than others, and their numbers can decline in the face of unfavorable conditions. This can result in a decrease in the abundance or presence of a particular plant species.

3. Increases in populations: It is also possible that certain organisms can thrive in the zone of physiological stress. These organisms might have adaptations or traits that allow them to cope better with the adverse conditions. Consequently, their populations might increase in response to the stress.

4. Immigration of invasive species: Stressful conditions can create opportunities for invasive species to establish themselves. These non-native species can take advantage of weakened ecosystems and outcompete native organisms, leading to the introduction and proliferation of invasive species in the affected area.

It is important to note that the specific effects observed in the zone of physiological stress can vary depending on the nature of the stress and the particular ecosystem involved.