Predatory fish switch between types of prey in response to variations in apex predator diet pdf abundance. Such changes in preference are disproportionate and are selected for as evolutionarily efficient.
Predators are an important factor to consider in managing fisheries, and methods for doing so are available and used in some places. This page was last edited on 8 September 2017, at 12:48. Unsourced material may be challenged and removed. Predator” and “prey” redirect here.
It could also constitute a chase, stalking, or attack of prey. For example, some parasites prey on their host and then lay their eggs on it, for their offspring to feed on it while it continues to live, or on its decaying corpse after it has died. The key characteristic of predation is the predator’s direct impact on the prey population. A true predator is one that kills and eats another living thing. Some may eat only part of an organism, but still consistently cause its death.
Grazing organisms generally do not kill their prey. Many species of plant are adapted to regrow after grazing damage. There is a continuum between these. Parasites can at times be difficult to distinguish from grazers. Their feeding behavior is similar in many ways, however they are noted for their close association with their host species. Some species however have looser associations with their hosts. It is therefore wise to treat this classification system as a continuum.
Parasitoids are organisms living in or on their host and feeding directly upon it, eventually leading to its death. They are much like parasites in their close symbiotic relationship with their host or hosts. Like the previous two classifications parasitoid predators do not kill their hosts instantly. However, unlike parasites, they are very similar to true predators in that the fate of their prey is quite inevitably death. Predators are often highly specialized, such as to hunt only one species of prey. The specialists are usually particularly well suited to capturing their preferred prey.