Nepenthesinfauna are the organisms that inhabit the pitchers of Nepenthes plants. These include fly and midge larvae, spiders, mites, ants, and even a species of crab, Geosesarma malayanum . The most common and conspicuous predators found in pitchers are mosquito larvae, which consume large numbers of other larvae during their development. Many of these animals are so specialised that they cannot survive anywhere else, and are referred to as nepenthebionts. [1]
The complex relationships between these various organisms are not yet fully understood. The question of whether infaunal animals "steal" food from their hosts, or whether they are involved in a mutually beneficial (symbiotic) association has yet to be investigated experimentally and is the source of considerable debate. Charles Clarke suggests that mutualism is a "likely situation", whereby "the infauna receives domicile, protection and food from the plant, while in return, the infauna helps to break down the prey, increase the rate of digestion and keep bacterial numbers low". [2]
Nepenthebionts are animals which are specialised to live inside Nepenthes pitchers and are totally dependent on them at least at some stage of their lives. Many species of mosquito larvae fall into this category. Examples include Culex rajah and Toxorhynchites rajah , which are named after Nepenthes rajah , as well as the related species Culex jenseni and Uranotaenia moultoni .
Nepenthephiles are organisms that are frequently found in Nepenthes pitchers, but which are not completely dependent on them at any stage of their lives. Most animals that coexist with Nepenthes fall into this category. Examples include Henriksenia nepenthicola , a crab spider that feeds on flies caught by Nepenthes, and Geosesarma malayanum , a species of crab.
Nepenthexenes are animals which are not normally associated with pitchers, but which are occasionally encountered in them. These are usually found if a pitcher becomes overloaded with putrefying prey, when it may be colonised by the larvae of various fly species. These simply feed on rotting matter regardless of whether it is found in pitchers.
In a 1991 study, [3] a wide diversity of animals was found in pitchers of Nepenthes ampullaria :
Carrion feeders:
Filter feeders:
Detritus feeders:
Nipping predators (can swim in the fluid, mandibles move against one another in a horizontal plane):
Hooking predators (can only crawl, mandibles move parallel to one another in a vertical plane):
Terrestrial predators:
Nepenthebiont Diptera:
Mosquitoes, the Culicidae, are a family of small flies consisting of 3,600 species. The word mosquito is Spanish and Portuguese for little fly. Mosquitoes have a slender segmented body, one pair of wings, three pairs of long hair-like legs, and specialized, highly elongated, piercing-sucking mouthparts. All mosquitoes drink nectar from flowers; females of some species have in addition adapted to drink blood. Evolutionary biologists view mosquitoes as micropredators, small animals that parasitise larger ones by drinking their blood without immediately killing them. Medical parasitologists view mosquitoes instead as vectors of disease, carrying protozoan parasites or bacterial or viral pathogens from one host to another.
Nepenthes is a genus of carnivorous plants, also known as tropical pitcher plants, or monkey cups, in the monotypic family Nepenthaceae. The genus includes about 170 species, and numerous natural and many cultivated hybrids. They are mostly liana-forming plants of the Old World tropics, ranging from South China, Indonesia, Malaysia, and the Philippines; westward to Madagascar and the Seychelles (one); southward to Australia (four) and New Caledonia (one); and northward to India (one) and Sri Lanka (one). The greatest diversity occurs on Borneo, Sumatra, and the Philippines, with many endemic species. Many are plants of hot, humid, lowland areas, but the majority are tropical montane plants, receiving warm days but cool to cold, humid nights year round. A few are considered tropical alpine, with cool days and nights near freezing. The name "monkey cups" refers to the fact that monkeys were once thought to drink rainwater from the pitchers.
Aedes albopictus, from the mosquito (Culicidae) family, also known as the (Asian) tiger mosquito or forest mosquito, is a mosquito native to the tropical and subtropical areas of Southeast Asia. In the past few centuries, however, this species has spread to many countries through the transport of goods and international travel. It is characterized by the white bands on its legs and body.
Aedes aegypti, the yellow fever mosquito, is a mosquito that can spread dengue fever, chikungunya, Zika fever, Mayaro and yellow fever viruses, and other disease agents. The mosquito can be recognized by black and white markings on its legs and a marking in the form of a lyre on the upper surface of its thorax. This mosquito originated in Africa, but is now found in tropical, subtropical and temperate regions throughout the world.
Nepenthes rajah is a carnivorous pitcher plant species of the family Nepenthaceae. It is endemic to Mount Kinabalu and neighbouring Mount Tambuyukon in Sabah, Malaysian Borneo. Nepenthes rajah grows exclusively on serpentine substrates, particularly in areas of seeping ground water where the soil is loose and permanently moist. The species has an altitudinal range of
Nepenthes ampullaria is a very distinctive and widespread species of tropical pitcher plant, present in Borneo, the Maluku Islands, New Guinea, Peninsular Malaysia, Singapore, Sumatra, and Thailand.
Nepenthes bicalcarata, also known as the fanged pitcher-plant, is a tropical pitcher plant endemic to northwestern Borneo, Indonesia. It is a myrmecophyte noted for its mutualistic association with a species of ant, Camponotus schmitzi. As an ant-fed plant it lacks many of the features that characterise the carnivorous syndrome in Nepenthes, including viscoelastic and highly acidic pitcher fluid, the waxy zone of the pitcher interior, and possibly even functional digestive enzymes.
Nepenthes mirabilis, or the common swamp pitcher-plant and tropical pitcher plant, is a carnivorous plant species. By far the most widespread of all Nepenthes, its range covers continental Southeast Asia and all major islands of the Malay Archipelago, stretching from China in the north to Australia in the south. The species exhibits great variability throughout its range. One of the more notable varieties, N. mirabilis var. echinostoma, is endemic to Brunei and Sarawak and possesses an extremely wide peristome.
Culex rajah is a species of mosquito in the genus Culex. It is endemic to Sabah, Malaysian Borneo. C. rajah is placed in the subgenus Culiciomyia. In its larval stage, C. rajah is found exclusively in the pitchers of Nepenthes rajah, a species of pitcher plant. As such, it is considered a nepenthebiont.
The Culicinae are the most extensive subfamily of mosquitoes (Culicidae) and have species in every continent except Antarctica, but are highly concentrated in tropical areas. Mosquitoes are best known as parasites to many vertebrate animals and vectors for disease. They are holometabolous insects, and most species lay their eggs in stagnant water, to benefit their aquatic larval stage.
Phytotelma is a small water-filled cavity in a terrestrial plant. The water accumulated within these plants may serve as the habitat for associated fauna and flora.
Carnivorous plants are plants that derive some or most of their nutrients from trapping and consuming animals or protozoans, typically insects and other arthropods, and occasionally small mammals and birds. They still generate all of their energy from photosynthesis. They have adapted to grow in waterlogged sunny places where the soil is thin or poor in nutrients, especially nitrogen, such as acidic bogs. They can be found on all continents except Antarctica, as well as many Pacific islands. In 1875, Charles Darwin published Insectivorous Plants, the first treatise to recognize the significance of carnivory in plants, describing years of painstaking research.
Wyeomyia smithii, the pitcher plant mosquito, is an inquiline mosquito that completes its pre-adult life cycle in the phytotelma of—that is, the water contained by—the purple pitcher plant, Sarracenia purpurea. In this microcommunity of bacteria, rotifers, protozoa, and midges, W. smithii is the top-level predator; its presence determines the bacterial species diversity within the pitcher.
Nepenthes attenboroughii, or Attenborough's pitcher plant, is a montane species of carnivorous pitcher plant of the genus Nepenthes. It is named after the celebrated broadcaster and naturalist Sir David Attenborough, who is a keen enthusiast of the genus. The species is characterised by its large and distinctive bell-shaped lower and upper pitchers and narrow, upright lid. The type specimen of N. attenboroughii was collected on the summit of Mount Victoria, an ultramafic mountain in central Palawan, the Philippines.
Diptera is an order of winged insects commonly known as flies. Diptera, which are one of the most successful groups of organisms on Earth, are very diverse biologically. None are truly marine but they occupy virtually every terrestrial niche. Many have co-evolved in association with plants and animals. The Diptera are a very significant group in the decomposition and degeneration of plant and animal matter, are instrumental in the breakdown and release of nutrients back into the soil, and whose larvae supplement the diet of higher agrarian organisms. They are also an important component in food chains.
Coquillettidia perturbans is a species of mosquito that have been documented in every continent except Antarctica. This mosquito is a known as a vector of West Nile virus and Eastern equine encephalomyelitis. The geographic range of C. perturbans is increasing due to the growing extensity of the feeding area. They are known to exist throughout the United States, mainly with a southern distribution, and are mammalophilic.
Francisco Edlagan Baisas was a Philippine entomologist regarded as the "Dean of Philippine Culicidologists" whose "contributions to the knowledge of Philippine mosquitoes is without measure". His passing was described as the end of "an era which saw the elucidation of the malaria vectors of the Philippines and great progress made in the control of a disease which had accounted for as many as 2,000,000 cases annually in those islands."
Toxorhynchites rutilus, also known as the elephant mosquito or treehole predatory mosquito, is a species of mosquito in the family Culicidae. Unlike most species in the genus that populate the tropics, Tx. rutilus is endemic to temperate regions. As their name suggests, these mosquitoes commonly lay their eggs in treeholes where their larvae are predators on a variety of arthropods. As with other mosquitoes, they also inhabit other bodies of stagnant water such as in a tire or artificial containers. but not large bodies of water like ponds and ground pools. Females are able to strategically locate breeding sites that already contain prey to oviposit in.