Ecological balance is a theory stipulating that natural conditions, including numbers of various animal and plant species, remain stable on their own through variations over time. The theory, also known as balance of nature, also holds that natural equilibrium can be changed significantly by new species entering an ecosystem, the disappearance of some species, man-made changes to the environment or natural disasters.Know More
Examples of disturbances to ecological balance include bombing during the Vietnam War that destroyed habitat for many species. As part of modern global commerce as of 2014, trees and vegetation are sometimes removed, and those areas in which vegetation is removed and pavement is added tend to expand. As a result, water balance changes, and species of animals and plants must move or change to find alternative habitats and sources of food.
The theory of ecological balance holds that natural systems typically correct themselves when small changes occur. For instance, if a particular species becomes too plentiful, numbers of a predator species may also increase temporarily to bring total numbers back into balance. As of 2014, most ecologists no longer subscribe to the theory of ecological balance and instead feel that natural systems are best described by catastrophe theory, which holds that small changes in one component of a natural system can result in significant and permanent changes to the entire system.Learn more about Earth Science
The four steps or conditions necessary for natural selection to occur are that more organisms are born than can survive, characteristics vary within a species, variations are inherited, and differences in reproduction and survival are due to variations. All four of these conditions must occur for natural selection to happen.Full Answer >
Optimal foraging is a theory that states an animal maximizes its net energy intake per unit of time spent foraging. Animals that engage in optimal foraging are favored by natural selection.Full Answer >
Most animal plankton (zooplankton) and plant plankton (phytoplankton) live several months, but some species may live for more than a year. However, there are thousands of species of plankton, making it impossible to pinpoint a specific average life span that can apply to all plankton species.Full Answer >
As omnivores, shrimp consume many different kinds of animal and plant species, but primarily feed on small fish, algae, plant particles and plankton. They will also eat decaying plants and will scavenge parts of dead animals such as snails, clams and fish, and will even eat other shrimp.Full Answer >