Hunting success

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Chameleon successfully capturing prey with its tongue Chameleon-Stage 03.jpg
Chameleon successfully capturing prey with its tongue

In ecology, hunting success is the proportion of hunts initiated by a predatory organism that end in success. Hunting success is determined by a number of factors such as the features of the predator, timing, different age classes, conditions for hunting, experience, and physical capabilities. Predators selectivity target certain categories of prey, in particular prey of a certain size. Prey animals that are in poor health are targeted and this contributes to the predator's hunting success. Different predation strategies can also contribute to hunting success, for example, hunting in groups gives predators an advantage over a solitary predator, and pack hunters like lions can kill animals that are too powerful for a solitary predator to overcome.

Contents

Similar to hunting success, kill rates are the number of animals an individual predator kills per time unit. Hunting success rate focuses on the percentage of successful hunts. [1] Hunting success is also measured in humans, but due to their unnaturally high hunting success, human hunters can have a big effect on prey population and behaviour, especially in areas lacking natural predators, recreational hunting can have inferences for wildlife populations.

Definition

Killer Whale chasing Chinook.jpg
The orca is an intelligent and social species of dolphin. It uses pack hunting and pursuit predation.
RANTHAMBORE TIGER RESERVE.jpg
The tiger is a solitary hunter that specializes in ambush and prefers preying on ungulates

Predators may actively seek out prey, if the predator spots its preferred target it would decide whether to attack or continue searching, and success ultimately depends on a number of factors. Predators may deploy a variety of hunting methods such as ambush, ballistic interception, pack hunting or pursuit predation. Hunting success is used to measure a predator's success rate against a species of prey or against all prey species in its diet, for example in the Mweya area of Queen Elizabeth National Park, lions had a hunting success of 54% against African buffaloes and 35.7% against common warthogs, though their overall hunting success was only 27.9%. [2] [3]

Hunting success across the animal kingdom vary from 5–97% and hunting success can greatly differ between different populations of the same species. Hunting success can be measured for predators in different trophic levels. Hunting success rate is the percentage of captures in a number of initiated hunts, for example, 1 in 2 to 20 tiger hunts are guessed to end in success, which means tigers are guessed to have a hunting success rate of between 5–50%. Percentage is the preferred method used to write hunting success rather than raw numbers. Usually a single study is used to represent the hunting success of an entire species or in some cases estimations are used. [4] [5] [1]

Hunting success can also be used to define the number of kills a human hunter makes over a specific number of hunts. However, hunting success is not used to define the number of animals a poacher, or a canned trophy hunter kills. [6]

Hunting success in animals

Detailed field studies show that prey are usually successful at escaping predators, with hunting success rates as low as 1–5% in many systems. The result of a predatory attack largest depends on the interaction between the predator's physical performance and any evasive maneuvers by the prey animal. [7]

List of animals by hunting success rate

Common nameFamilyPreferred hunting styleImageHunting success rateSource
Wolf CanidaePack hunting

Canis lupus Ernstbrunn.jpg

20% [8]
Spotted hyena HyaenidaePack hunting and pursuit predation

Spotted Hyena, Ngorongoro.jpg

75% [9]
Peregrine falcon FalconidaePursuit predation

Falco peregrinus - 01.jpg

47% [10]
Great white shark LamnidaeAmbush Great white shark south africa.jpg 48% [11]
Dhole CanidaePack hunting Dhole (Asiatic wild dog) cropped.jpg 20% [12]
Harbour porpoise PhocoenidaePursuit predation

Daan Close Up.PNG

90% [13]
CatFelidaeAmbush

Cat November 2010-1a.jpg

30% [14]
Dragon fly –Pursuit predation

Anisoptera near Joranda Water Fall Simlipal Biosphere Reserve.jpg

95% [5]
Leopard FelidaeAmbush

Leopard africa.jpg

14–38% [15]
LionFelidaePack hunting and ambush

Lion (Panthera leo) (30941994012).jpg

27–34% [16]
African wild dog CanidaePack hunting and pursuit predation

African wild dog lycaon pictus.jpg

60–90% [17]
CheetahFelidaePursuit predation

Hunting Cheetah.jpg

40–50% [18]
Black-footed cat FelidaeAmbush

Black-Footed Cat-BrookfielZoo2.jpg

60% [19]
TigerFelidaeAmbush

Panthera tigris tigris Tidoba 20150306.jpg

5–50% [4]

Reasons for high hunting success

Dragonflies having the highest hunting success of any animal, varying anywhere from 90 to 97% Hairy dragonfly (Brachytron pratense) male eating bee.jpg
Dragonflies having the highest hunting success of any animal, varying anywhere from 90 to 97%

Most mammals have a hunting success below 50% [20] but some mammals such as African wild dogs and harbour porpoises can have hunting success rates of over 90%. The African wild dog is one of the most effective hunters on earth, with hunting success reaching a maximum of 90%. Their high levels of hunting success is due to their highly co-operative hunting behaviour accompanied with high stamina. Wild dogs typically use their stamina to exhaust their prey, which are usually caught after a chase lasting an average of 2 km (1.2 mi). The wild dog's stamina and the prey animal's exhaustion are the driving factors that cause most successful hunts. [21] Harbour porpoises are not usually social but on multiple occasions they've been recorded hunting cooperatively. The average group size consists of about two individuals. Using echolocation, they locate prey and capture them. They continuously forage throughout the day and night to meet their body requirements. It is hypothesized that harbour porpoises eat large amounts of food, about 10% of their own body mass. Another theory suggests that harbour porpoises require relatively large energy-rich prey, with high hunting success rates to meet their estimated metabolic requirements. [13]

Dragonflies have the highest observed hunting success of any animal, with success rates as high as 97%. They are also opportunistic and pursue a variety of prey. Predatory performance may have consequences in terms of energetics, mortality and potential loss of feeding or mating territories. The reason for their hunting success is due to many unique evolutionary adaptations, which includes aspects of eyesight and flight. In terms of flight, dragonflies can independently control their fore and hind wings, they can also hover and fly in any direction, including backwards. They can fixate on their prey and predict its next move, catching it midair with extreme accuracy. Each of a dragonfly's eyes is made up of thousands of units known as ommatidia that run across its head. This gives them almost 360-degree-vision, which helps them spot prey more efficiently. [22] [23]

The black-footed cat has the highest hunting success of any member of family Felidae. In 1993, a female and male were observed for 622 hours, a kill was made every 50 minutes and they had a hunting success of 60%. A total of 550 animals were consumed. About 14 small animals were caught each night. Their hunting success is due to their hunting behaviour and frequency of initiated hunts. They use three different ways of hunting, which includes "fast hunting", "slow hunting" and "sit and wait" hunt. They use these three hunting strategies to ambush or pursue their prey which mostly includes small mammals, insects and small birds. [19]

Kill rates

Kill rates is the number of prey or biomass killed by an individual predator per unit time. A predator's functional response refers to how kill rates vary with prey density and are of central importance when predicting the stability threshold for prey populations under the effects of predation, and also estimate the potential carrying capacity of the populations of predators. Kill rates and functional responses are both influenced by diverse ecological variables. Kill rates defer between males and females, solitary individuals, social individuals, mothers with cubs, different age classes, individual fitness, prey availability, experience, etc.

Kill rates are required to further understand functional responses and predator-prey dynamics, as well as develop conservation strategies for predator species around the world. Kill rate studies have been conducted for large carnivores such as gray wolves, jaguars, tigers and leopards. A kill rate study of cougars showed that females with cubs had the highest kill rate, with one adult female with cubs in northern California having a kill rate of 2.35 ungulates per week. Adult males averaged 0.84 ungulates per week, females with cubs had an average of 1.24 ungulates per week and solitary females had a mean kill rate of 0.99 ungulates per week. [24]

Factors influencing success

Selective feeding

Komodo dragon stalking deer Komodo dragon stalking deer.png
Komodo dragon stalking deer

Hunting success depends on the distance or time the predator has to catch its prey, comparable to the distance (time) that the prey has to escape. [25] In the wild, a discrepancy is observed between the carnivore's low hunting success and highly selective predation on ill animals. This behaviour may be described by the co-adaptive evolution of predator and prey. A predator like a wolf cannot always hunt a given deer, because an error in prey choice can lead to energy loss, injury and even death. [26] Predators tend to seek vulnerable prey, and this is the basis of the selective impact of predators on the population of prey species. [27] The low hunting success rate of wild carnivores, may be due to the fact that identification of potentially vulnerable prey from distance is imperfect, the more so that the behaviour of prey compensate for its poor health. In the wild, the capacity for distinguishing odors or a slight difference in prey behaviour are influenced by a number of factors, such as wind strength and direction, the body condition and features of the predator, its experience, conditions for pursuing prey and much more. [28] The microbiota (metabolites at the surface of the body) in animals exposed to long-term stress are responsible for their specific stress odor, this allows predators to evaluate the vulnerability of its potential prey. The causes of reduced health differs and depends on the individual animal's sensitivity to several biotic and abiotic factors such as endogenous, infectious, and parasitic diseases, intra- and interspecific interactions, etc. The host macro-organism, which is the microflora system helps predators to judge the state of its prey. [29]

Social and solitary predators

Increased hunting success is a frequently cited benefit of group living in social predators and this is also a hypothesis for the evolution of sociality. [30] However, previous research shows that the benefit of increased hunting success is only present in small groups. In several group hunting taxas, ranging from insects to primates, despite the cooperation among the hunters, the hunting success of the larger group size does not increase. [31] Research shows that predator groups of 2–5 animals have the highest hunting success rates, then levels off, or even declines, across larger groups. [32] It has been theorised that the hunting success of predators hunting formidable prey increases with group size. This pattern is caused by the increased cooperation in large groups due to the much lower chance a solitary predator has against such prey. The low hunting success of solitary predators promotes cooperation because an extra hunter can sufficiently improve group hunting success to avoid the risk of injury and energy loss.

Hunting methods

The Orchid mantis uses its camouflage to ambush its prey. Mantis Hymenopus coronatus 6 Luc Viatour (cropped).jpg
The Orchid mantis uses its camouflage to ambush its prey.

Field studies show that different predator hunting methods (ambush, pursuit predation, etc.) can lead to distinct number of individuals or prey captured. [33] Due to this, predators with different hunting strategies can cause competing trophic cascades and function at different trophic levels. [34] Predators are often classified as active or sit-and-wait predators by their average hunting behaviour. [35] The locomotor crossover hypothesis states that ambush predators should have more success when hunting fast-moving prey, whereas cursorial predators should be more successful when hunting sedentary prey. Studies reveal that starvation can cause an ambush predator to adopt a pursuit predation hunting method, though ambush predators regularly switch to pursuit predation when prey densities are lower. [36] [37] Experiments show that differences in prey's anti-predator responses to the environment can influence predator behaviour or success. Field observations show that predators can alter their hunting behaviour at larger scales according to prey behaviour, but at smaller scales they seek specific locations where they can facilitate hunting.

Environmental influences

Green crabs can be affected by environmental conditions such as high flow velocities Carcinus maenas.jpg
Green crabs can be affected by environmental conditions such as high flow velocities

Conditions in the environment have an influence on a predator's ability to detect prey and vice versa. A primary mechanism is the limiting of foraging time obtained by mobile predators due to the risk of unfavourable conditions. The importance of predators on community functioning in gentle environments, an effect which reduces in stressful situations. Hydrodynamic stress associated with waves decreases the predator's success, as these conditions restrict predator mobility and foraging activity. Environmental conditions may impair a predator's ability to find or consume prey. For instance, green crab predation drastically decreased in the vicinity of the Damariscotta River with high flow celerities, though they were found at greater densities in high flow rates. Similar incidents happened when fish, insects and copepods exhibited much lower foraging success in more rapid flows. As a result, environmental conditions can influence predators by reducing their ability to find or handle prey. Behavioural research shows that environmental conditions like hydrodynamics can have a big effect in systems where predators rely on chemical cues to find their prey. [38]

Vegetative cover

Vegetative cover can be important when hunting, especially in ambush predators. Leopard stalking.JPG
Vegetative cover can be important when hunting, especially in ambush predators.

A predator's hunting behaviour is suited for hunting in specific types of vegetative cover and is thus a largely custom characteristic in taxonomic families. Felids for instance typically use dense cover to stalk or ambush prey, whereas canids do not use vegetative cover when hunting. Sympatric predators like the Canada lynx and the coyote were tracked in the snow for three seasonal winters and hunting behaviour in relation to vegetative cover was studied. The main prey for both species were snowshoe hares, the lynx pursued hares more frequently in sparse white spruce canopies than coyotes, on the other hand coyotes pursued hares more in dense spruce than lynxes. It is thought that the hunting behaviour of lynxes varies according to cover, while that of coyotes is fixed. However, coyotes appeared to use cover to their advantage when stalking hares, possibly an influence of snow on the hunting methods of each of the predator species. [39]

In human hunters

Hunting success in humans

Just like in other animals, hunting success in humans differ considerably. Paul Childerley driven hunt Finland 04.png
Just like in other animals, hunting success in humans differ considerably.

Hunting success in humans differ in methods used, selected prey, the performance of the hunter, weather conditions, etc. A study showed that hunters who used dogs had a hunting success of 60%, while those who employed persistent hunting had a hunting success of 37–100% over 15 attempted hunts. Hunters who hunted with bows and arrows had a hunting success of only 5%, whereas others who hunted with springhare probe had a hunting success of 14% and yet others who used clubs and spears had a success rate of 45%. The study was based on the hunting methods of the bushmen in southern Africa. [6]

Factors influencing success of human hunters

Professional deerstalker standing next to red deer stag Professional stalker standing next to red deer stag Ardnamurchan Estate Scotland darker 01.png
Professional deerstalker standing next to red deer stag

In Kentucky, US, a study was conducted about the factors influencing the flush and hunting success of hunters in three game species which were ruffed grouse, northern bobwhite and the cottontail rabbit. Encounter rates may have effects on population dynamics, hunter satisfaction, and hunter retention. In a 12-year span between 2003 and 2015, there were about 3,948 grouse hunts, 19,301 rabbit hunts, and 4,798 bobwhite hunts took place. In this case, hunting success was defined as the number of animals a hunting party flushed out. Hunting success was expected to increase over the hunting season due to cover being reduced and weather being more hospitable for upland hunting. Hunting was usually enhanced when more hunters and dogs were introduced to hunting parties. [40]

Hunting types and methods

Hunting in Yorkshire, northern England, in 2005, on the last day of fully legal, proper, fox hunting. BedaleHunt2005.jpg
Hunting in Yorkshire, northern England, in 2005, on the last day of fully legal, proper, fox hunting.

There are many types of hunting that human hunters employ, these types include recreational hunting (e.g. trophy hunting), medium/small game hunting (e.g. deer hunting), fowling, pest control/nuisance management, commercial hunting (e.g. whaling) and poaching. In terms of hunting methods 24 methods are used. This methods include baiting (i.e. the use of baits to lure animals), battue (i.e. scaring animals into a killing zone), beagling (i.e. using beagles in hunts), the use of camouflage to hunt, shooting, the use of dogs, persistence hunting (i.e. use of stamina to exhaust prey), stalking and much more. Modern regulations differentiate between lawful hunting and illegal poaching, where uncontrolled hunting of animals occur.

Historical, substinence, and sport hunting can greatly differ, with modern hunting regulations addressing the issues of hunting and the most sustainable way to hunt. Techniques vary between government regulations, a hunter's personal ethics, local practices, hunting equipment, and the target animal species. Hunters may use a combined of two or more hunting techniques, though law may forbid hunters from using techniques common in activities like poaching and wildlife management. [41]

Impact

The exploitation of animal species currently threatens many species with extinction. Particularly in tropical rainforests, where hunting for food poses the most severe threat to many species in tropical rainforests. In some cases, Piro shortgun hunters took a limited number of shotgun cartridges on hunting trips, and they usually pay no attention to less profitable prey early in the trip, when the chance for more profitable prey becomes more likely. [42] Human disturbance can influence the behaviour of wild animals, which can have inferences for wildlife populations. [43] For example, in Northeastern Gabon, studies show that hunting and human disturbance decreased the population of large mammals near roads and in more populated areas. In particular, primates like chimpanzees and mandrills were found far from the roads, this could possibly be due to more intense hunting of these species for either bushmeat or in retaliation for crop raiding. [44] Most large predators have been extirpated from the range of the white-tailed deer, so hunters have now taken this predatory role. Hunters can indirectly affect prey species, indirect behavioural responses includes altered selection of resource, space use or movement. Deers realize that humans are a threat and adapt behavioural strategies by minimizing movement and showing high resistancy times in established ranges, factors that influence harvest susceptibility. [45]

See also

Related Research Articles

<span class="mw-page-title-main">Predation</span> Biological interaction where a predator kills and eats a prey organism

Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation and parasitoidism. It is distinct from scavenging on dead prey, though many predators also scavenge; it overlaps with herbivory, as seed predators and destructive frugivores are predators.

<span class="mw-page-title-main">Nocturnality</span> Behavior characterized by activity during the night and sleeping during the day

Nocturnality is a behavior in some non-human animals characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite.

<span class="mw-page-title-main">Crepuscular animal</span> Animal behavior primarily characterized by activity during the twilight

In zoology, a crepuscular animal is one that is active primarily during the twilight period, being matutinal, vespertine/vespertinal, or both. This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daylight and of darkness, respectively. Some crepuscular animals may also be active by moonlight or during an overcast day. Matutinal animals are active only before sunrise, and vespertine only after sunset.

<span class="mw-page-title-main">Foraging</span> Searching for wild food resources

Foraging is searching for wild food resources. It affects an animal's fitness because it plays an important role in an animal's ability to survive and reproduce. Foraging theory is a branch of behavioral ecology that studies the foraging behavior of animals in response to the environment where the animal lives.

<span class="mw-page-title-main">Scavenger</span> Organism that feeds on dead animal and/or plants material

Scavengers are animals that consume dead organisms that have died from causes other than predation or have been killed by other predators. While scavenging generally refers to carnivores feeding on carrion, it is also a herbivorous feeding behavior. Scavengers play an important role in the ecosystem by consuming dead animal and plant material. Decomposers and detritivores complete this process, by consuming the remains left by scavengers.

<span class="mw-page-title-main">Herd</span> Similar as Group

A herd is a social group of certain animals of the same species, either wild or domestic. The form of collective animal behavior associated with this is called herding. These animals are known as gregarious animals.

<span class="mw-page-title-main">Chacma baboon</span> Species of baboon from the Old World monkey family

The chacma baboon, also known as the Cape baboon, is, like all other baboons, from the Old World monkey family. It is one of the largest of all monkeys. Located primarily in southern Africa, the chacma baboon has a wide variety of social behaviours, including a dominance hierarchy, collective foraging, adoption of young by females, and friendship pairings. These behaviors form parts of a complex evolutionary ecology. In general, the species is not threatened, but human population pressure has increased contact between humans and baboons. Hunting, trapping, and accidents kill or remove many baboons from the wild, thereby reducing baboon numbers and disrupting their social structure.

Apostatic selection is a form of negative frequency-dependent selection. It describes the survival of individual prey animals that are different from their species in a way that makes it more likely for them to be ignored by their predators. It operates on polymorphic species, species which have different forms. In apostatic selection, the common forms of a species are preyed on more than the rarer forms, giving the rare forms a selective advantage in the population. It has also been discussed that apostatic selection acts to stabilize prey polymorphisms.

<span class="mw-page-title-main">Pack hunter</span> Type of predatory animal

A pack hunter or social predator is a predatory animal which hunts its prey by working together with other members of its species. Normally animals hunting in this way are closely related, and with the exceptions of chimpanzees where only males normally hunt, all individuals in a family group contribute to hunting. When hunting cooperation is across two or more species, the broader term cooperative hunting is commonly used.

<span class="mw-page-title-main">Optimal foraging theory</span> Behavioral ecology model

Optimal foraging theory (OFT) is a behavioral ecology model that helps predict how an animal behaves when searching for food. Although obtaining food provides the animal with energy, searching for and capturing the food require both energy and time. To maximize fitness, an animal adopts a foraging strategy that provides the most benefit (energy) for the lowest cost, maximizing the net energy gained. OFT helps predict the best strategy that an animal can use to achieve this goal.

<span class="mw-page-title-main">Persistence hunting</span> Hunting until the prey animal can no longer flee

Persistence hunting, also known as endurance hunting or long-distance hunting is a variant of pursuit predation in which a predator will bring down a prey item via indirect means, such as exhaustion, heat illness or injury. Hunters of this type will typically display adaptions for distance running, such as longer legs, temperature regulation, and specialized cardiovascular systems.

<span class="mw-page-title-main">Cannibalism</span> Consuming another individual of the same species as food

Cannibalism is the act of consuming another individual of the same species as food. Cannibalism is a common ecological interaction in the animal kingdom and has been recorded in more than 1,500 species. Human cannibalism is well documented, both in ancient and in recent times.

<span class="mw-page-title-main">Flock (birds)</span> A group of individual birds travelling together

A flock is a gathering of individual birds to forage or travel collectively. Avian flocks are typically associated with migration. Flocking also offers foraging benefits and protection from predators, although flocking can have costs for individual members.

<span class="mw-page-title-main">Matutinal</span> Natural world activity in early morning

Matutinal, matinal, and matutine are terms used in the life sciences to indicate something of, relating to, or occurring in the early morning. The term may describe crepuscular animals that are significantly active during the predawn or early morning hours. During the morning twilight period and shortly thereafter, these animals partake in important tasks, such as scanning for mates, mating, and foraging.

Overpopulation or overabundance is a phenomenon in which a species' population becomes larger than the carrying capacity of its environment. This may be caused by increased birth rates, lowered mortality rates, reduced predation or large scale migration, leading to an overabundant species and other animals in the ecosystem competing for food, space, and resources. The animals in an overpopulated area may then be forced to migrate to areas not typically inhabited, or die off without access to necessary resources.

<span class="mw-page-title-main">Shoaling and schooling</span> In biology, any group of fish that stay together for social reasons

In biology, any group of fish that stay together for social reasons are shoaling, and if the group is swimming in the same direction in a coordinated manner, they are schooling. In common usage, the terms are sometimes used rather loosely. About one quarter of fish species shoal all their lives, and about one half shoal for part of their lives.

Vigilance, in the field of behavioural ecology, refers to an animal's monitoring of its surroundings in order to heighten awareness of predator presence. Vigilance is an important behaviour during foraging as animals must often venture away from the safety of shelter to find food. However, being vigilant comes at the expense of time spent feeding, so there is a trade-off between the two. The length of time animals devote to vigilance is dependent on many factors including predation risk and hunger.

<span class="mw-page-title-main">Pursuit predation</span> Hunting strategy by some predators

Pursuit predation is a form of predation in which predators actively give chase to their prey, either solitarily or as a group. It is an alternate predation strategy to ambush predation — pursuit predators rely on superior speed, endurance and/or teamwork to seize the prey, while ambush predators use concealment, luring, exploiting of surroundings and the element of surprise to capture the prey. While the two patterns of predation are not mutually exclusive, morphological differences in an organism's body plan can create an evolutionary bias favoring either type of predation.

Dietary conservatism is a foraging strategy in which individuals show a prolonged reluctance to eat novel foods, even after neophobia has been overcome. Within any given population of foragers, some will be conservative and some will be adventurous, an alternative strategy in which individuals readily accept novel food immediately after neophobia has waned. Dietary conservatism and neophobia are however distinct processes, distinguished by the persistence of an individual's reluctance to eat over repeated encounters with novel food and over long time periods.

<span class="mw-page-title-main">Ecology of fear</span> Psychological impact induced by predators

The ecology of fear is a conceptual framework describing the psychological impact that predator-induced stress experienced by animals has on populations and ecosystems. Within ecology, the impact of predators has been traditionally viewed as limited to the animals that they directly kill, while the ecology of fear advances evidence that predators may have a far more substantial impact on the individuals that they predate, reducing fecundity, survival and population sizes. To avoid being killed, animals that are preyed upon will employ anti-predator defenses which aid survival but may carry substantial costs.

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