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Intraspecific Competition
Intraspecific competition is an interaction in population ecology, whereby members of the same species compete for limited resources. This leads to a reduction in fitness for both individuals, but the more fit individual survives and is able to reproduce. By contrast, interspecific competition occurs when members of different species compete for a shared resource. Members of the same species have rather similar requirements for resources, whereas different species have a smaller contested resource overlap, resulting in intraspecific competition generally being a stronger force than interspecific competition. Individuals can compete for food, water, space, light, mates, or any other resource which is required for survival or reproduction. The resource must be limited for competition to occur; if every member of the species can obtain a sufficient amount of every resource then individuals do not compete and the population grows exponentially. Prolonged exponential growth is rare i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fighting Hartebeest
Combat ( French for ''fight'') is a purposeful violent conflict meant to physically harm or kill the opposition. Combat may be armed (using weapons) or unarmed ( not using weapons). Combat is sometimes resorted to as a method of self-defense, or can be used as a tool to impose one's will on others. An instance of combat can be a stand-alone confrontation or a small part of a much larger violent conflict. Instances of combat may also be benign and recreational, as in the cases of combat sports and mock combat. Combat may comply with, or be in violation of local or international laws regarding conflict. Examples of rules include the Geneva Conventions (covering the treatment of people in war), medieval chivalry, the Marquess of Queensberry rules (covering boxing) and several forms of combat sports. Hand-to-hand combat Hand-to-hand combat (melee) is combat at very close range, attacking the opponent with the body ( striking, kicking, strangling, etc.) and/or with a melee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fighting Flamingos (6911914548)
Combat ( French for ''fight'') is a purposeful violent conflict meant to physically harm or kill the opposition. Combat may be armed (using weapons) or unarmed ( not using weapons). Combat is sometimes resorted to as a method of self-defense, or can be used as a tool to impose one's will on others. An instance of combat can be a stand-alone confrontation or a small part of a much larger violent conflict. Instances of combat may also be benign and recreational, as in the cases of combat sports and mock combat. Combat may comply with, or be in violation of local or international laws regarding conflict. Examples of rules include the Geneva Conventions (covering the treatment of people in war), medieval chivalry, the Marquess of Queensberry rules (covering boxing) and several forms of combat sports. Hand-to-hand combat Hand-to-hand combat (melee) is combat at very close range, attacking the opponent with the body ( striking, kicking, strangling, etc.) and/or with a melee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenophorus Pictus
''Ctenophorus pictus'', commonly known as the painted ground-dragon or painted dragon,Waite ER (Editor). (1929). ''The Reptiles and Amphibians of South Australia''. Adelaide: Government Printer. 270 pp. is a species of lizard from the family Agamidae. It is endemic to the drier areas of southern and central Australia. Description The painted dragon is a medium-sized terrestrial lizard with a short, deep head and uniform body scales. The appearance of this species is extremely variable as it can appear in a number of different colour combinations.Wilson S, Swan G. (2013). ''A Complete Guide to Reptiles of Australia'' (Fourth Edition). London: New Holland Publishers. 592 pp. . Adult males can be brown, yellowish brown, orange to reddish brown with dark-edged pale bars, blotches or spots overlaying a dark vertebral stripe. The flanks are spotted, variegated (irregular patches/streaks), or reticulated (net-like pattern) with dark brown and dotted with scattered, pale, dark-edged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White-headed Capuchin
White-faced capuchin, or white headed capuchin, can refer to either of two species of gracile capuchin monkey: * ''Cebus imitator'', the Panamanian white-faced capuchin, also known as the Panamanian white-headed capuchin or Central American white-faced capuchin * ''Cebus capucinus'', the Colombian white-faced capuchin, also known as the Colombian white-headed capuchin There are 2 subspecies of Colombian white-headed capuchin: * ''C. c. capucinus'' * ''C. c. curtus'' (Gorgona white-headed capuchin) ''C. imitator'' has a range in Central America, in Honduras, Nicaragua, Costa Rica and Panama. The range of ''C. capucinus'' is primarily in South America, in western Colombia and northwest Ecuador, although its range extends into the easternmost portion of Panama. ''C. c. curtus'' has a range restricted to Gorgona Island, while ''C. c. capucinus'' covers the remainder of the ''C. capucinus'' range. The two species differ slightly in appearance. Both are smallish monkeys which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferret
The ferret (''Mustela furo'') is a small, domesticated species belonging to the family Mustelidae. The ferret is most likely a domesticated form of the wild European polecat (''Mustela putorius''), evidenced by their interfertility. Other mustelids include the stoat, badger and mink. Physically, ferrets resemble other mustelids because of their long, slender bodies. Including their tail, the average length of a ferret is about ; they weigh between ; and their fur can be black, brown, white, or a mixture of those colours. In this sexually dimorphic species, males are considerably larger than females. Ferrets may have been domesticated since ancient times, but there is widespread disagreement because of the sparseness of written accounts and the inconsistency of those which survive. Contemporary scholarship agrees that ferrets were bred for sport, hunting rabbits in a practice known as rabbiting. In North America, the ferret has become an increasingly prominent choice of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Rabbit
The European rabbit (''Oryctolagus cuniculus'') or coney is a species of rabbit native to the Iberian Peninsula (including Spain, Portugal, and southwestern France), western France, and the northern Atlas Mountains in northwest Africa. It has been widely introduced elsewhere, often with devastating effects on local biodiversity. Its decline in its native range due to myxomatosis, rabbit calicivirus, overhunting and habitat loss has caused the decline of the Iberian lynx (''Lynx pardinus'') and Spanish imperial eagle (''Aquila adalberti''). It is known as an invasive species because it has been introduced to countries on all continents with the exception of Antarctica, and has caused many problems within the environment and ecosystems; in particular, European rabbits in Australia have had a devastating impact, due in part to the lack of natural predators there. The European rabbit is well known for digging networks of burrows, called warrens, where it spends most of its time wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligosoma
''Oligosoma'' is a genus of small to medium-sized skinks (family Scincidae) found only in New Zealand, Norfolk Island and Lord Howe Island. ''Oligosoma'' had previously been found to belong to the ''Eugongylus'' group of genera in the subfamily Lygosominae; the Australian genus ''Bassiana'' appears to be fairly closely related. Species The currently described species are: *'' Oligosoma acrinasum'' – Fiordland skink *'' Oligosoma aeneum'' – copper skink *'' Oligosoma alani'' – Alan's skink, robust skink *'' Oligosoma albornense'' – Alborn skink *'' Oligosoma auroraense'' – Hawke's Bay skink, eastern speckled skink *'' Oligosoma awakopaka'' – Awakopaka skink *'' Oligosoma burganae'' – Burgan skink *'' Oligosoma chloronoton'' – green skink *'' Oligosoma elium'' – Marlborough spotted skink *'' Oligosoma fallai'' – Falla's skink, Three Kings skink *'' Oligosoma grande'' – grand skink *'' Oligosoma hardyi'' – Hardy's skink *'' Oligosoma homalonot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Predation
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 (which usually do not kill the host) and parasitoidism (which always does, eventually). 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. Predators may actively search for or pursue prey or wait for it, often concealed. When prey is detected, the predator assesses whether to attack it. This may involve ambush or pursuit predation, sometimes after stalking the prey. If the attack is successful, the predator kills the prey, removes any inedible parts like the shell or spines, and eats it. Predators are adapted and often highly specialized for hunting, with acute senses such as vision, hearing, or smell. Many predatory animals, both vertebrate an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viviparous Lizard
The viviparous lizard, or common lizard, (''Zootoca vivipara'', formerly ''Lacerta vivipara''), is a Eurasian lizard. It lives farther north than any other species of non-marine reptile, and is named for the fact that it is viviparous, meaning it not only lays eggs, but also gives birth to live young. Both "''Zootoca''" and "''vivipara''" mean "live birth," in Greek and Latin respectively. It was called ''Lacerta vivipara'' until the genus ''Lacerta'' was split into nine genera in 2007 by Arnold, Arribas & Carranza. Male and female ''Zootoca vivipara'' are equally likely to contract blood parasites. Additionally, larger males have been shown to reproduce more times in a given reproductive season than smaller ones. The lizard is also unique as it is exclusively carnivorous, eating only flies, spiders, and insects. Studies show that the more carnivorous an individual is (the more insects they eat), the less diverse the population of parasitic helminths that infest the lizards. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Population Density
Population density (in agriculture: Stock (other), standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term.Matt RosenberPopulation Density Geography.about.com. March 2, 2011. Retrieved on December 10, 2011. In simple terms, population density refers to the number of people living in an area per square kilometre, or other unit of land area. Biological population densities Population density is population divided by total land area, sometimes including seas and oceans, as appropriate. Low densities may cause an extinction vortex and further reduce fertility. This is called the Allee effect after the scientist who identified it. Examples of the causes of reduced fertility in low population densities are * Increased problems with locating sexual mates * Increased inbreeding Human densities Population density is the number of people pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolf Spider
Wolf spiders are members of the family Lycosidae (). They are robust and agile hunters with excellent eyesight. They live mostly in solitude, hunt alone, and do not spin webs. Some are opportunistic hunters, pouncing upon prey as they find it or chasing it over short distances; others wait for passing prey in or near the mouth of a burrow. Wolf spiders resemble nursery web spiders (family Pisauridae), but wolf spiders carry their egg sacs by attaching them to their spinnerets, while the Pisauridae carry their egg sacs with their chelicerae and pedipalps. Two of the wolf spider's eight eyes are large and prominent; this distinguishes them from nursery web spiders, whose eyes are all of roughly equal size. This can also help distinguish them from the similar-looking grass spiders. Description The many genera of wolf spiders range in body size (legs not included) from less than . They have eight eyes arranged in three rows. The bottom row consists of four small eyes, the middle r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex Ratio
The sex ratio (or gender ratio) is usually defined as the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically about 1:1 in species which reproduce sexually. Many species deviate from an even sex ratio, either periodically or permanently. Examples include parthenogenic species, periodically mating organisms such as aphids, some eusocial wasps, bees, ants, and termites. The human sex ratio is of particular interest to anthropologists and demographers. In human societies, sex ratios at birth may be considerably skewed by factors such as the age of mother at birth and by sex-selective abortion and infanticide. Exposure to pesticides and other environmental contaminants may be a significant contributing factor as well. As of 2014, the global sex ratio at birth is estimated at 107 boys to 100 girls (1,000 boys per 934 girls).. Types In most species, the sex ratio varies according to the age profile of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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