Виды бродяги

В экологии виды бродяги - это организм , который был распространен во всем мире человеческой деятельностью. Этот термин был придуман Уильямом Мортоном Уилером в Бюллетене Американского музея естественной истории в 1906 году, который использовался для описания муравьев , которые «пробились, а также известные бродяги или втильны [sic] на многие острова». ^{[ 1 ]} С тех пор термин расширился, чтобы включить неант организмов, но остается наиболее популярным в мирмекологии . Виды бродяги были отмечены во многих филах, охватывающих как животные , так и растительные королевства, включая, помимо прочего, членистоногие , моллюски , брауфиты и птеридофиты . Термин «бродяги » был популяризирован и дано более определение от Luc Passera в его главе «Экзотические муравья» Дэвида Ф. Уильяма 1994 года: биология, воздействие и контроль внедренных видов . ^{[ 2 ]}

Определение

Виды бродяги - это организмы, которые имеют стабильные популяции за пределами их родных диапазонов. ^{[ 3 ]} Они тесно связаны с человеческой деятельностью. ^{[ 3 ]} Они являются специфилиями для беспорядков, ^{[ 3 ]} и характеризуются их синантропическими ассоциациями с людьми ^{[ 4 ]} в качестве основного способа расширения является человеческое опосредованное рассеивание. ^{[ 5 ]} При этом виды бродяги не ограничиваются антропогенно нарушенными местами обитания , они могут вторгаться в нетронутые места обитания, особенно когда они устанавливаются в новой области. ^{[ 6 ]} Например, Anoplolepis gracilipes смог вторгнуться в нетронутые лесные экосистемы в Австралии после того, как их вводятся и имели устоявшуюся население на северо -востоке Арнема . ^[7] It is important to note that while some tramp species are invasive, the majority of them are not.^[8] Some can exist alongside native species without competing with them, simply occupying unfilled niches, such as is the case with some populations of Tapinoma melanocephalum and Monomorium pharaonic, who rarely interfere with native species outside human settlement areas.^[8]

Ants

Pharaoh ant (*Monomorium pharaonis)* a well established tramp species able to thrive in diverse environments.

Ants have a more rigid list of criterion to be considered "true" tramp species. The most cited body of work outlining these traits comes from Luc Passera.^[2] His primary and most important criterion is that the distribution of the species must be linked to human activities, what he refers to as "anthropophilic tendency".^[2] He also lists the following traits as being likely common to all tramp species: small size, monomorphism of worker ants (worker ants having only one phenotype), high rates of polygyny, unicoloniality, strong interspecific aggressiveness, worker ant sterility, and colony reproduction by budding.^[2] These traits may appear with more or less intensity among considered tramp species,^[2] and in fact, literature does not currently require a tramp species to possess every single one of these attributes.^[9] Ant tramp species in particular can be ecological indicators on the susceptibility of an ecosystem to become invaded^[6] or ecological instability.^[2]

Causes and distribution

All tramp species are distributed globally by as a result of human transportation.^[5]^[10]^[11]^[12]^[8]^[13]^[6]^[4] As such, they are almost always present in urban or human-settled environments, and have colonizing mechanisms that are well adapted to human cohabitation,^[13] referred to as possessing "anthropogenically reinforced dispersal biology".^[11] The globalization of trade and travel have contributed significantly to the dispersal of tramp species worldwide.^[11] Trade activities involving the importation and exportation of cargos on ships (often containing plants, soil, wood and other biological mediums) are noted as being an especially important methods of introduction.^[5] These often repeated introductions (as oftentimes shipments will come from the same place) contribute to fortifying the genetic variability and initial population sizes of newly transplanted tramp species, which facilitates their establishment in novel environments.^[5] After their human-mediated introductions, tramp species can also benefit from human disturbance to the environment. Anthropogenic forces (such as construction and agriculture) can dramatically impact local fauna and flora, weakening the environment and making the area more susceptible to the encroachment of tramp species.^[13] This phenomenon is noted as a particularly tough issue in Tropical Asia, where monocropping practices of local rubber plant farms have decimated indigenous species assemblages and habitat structures, allowing the establishment of many problematic tramp species.^[6] Another example is the Thousand Islands Archipelago in Indonesia, where the small tropical islands are especially vulnerable to human disturbance, which facilitated the establishment of multiple tramp species.^[13]

The range expansion of tramp ants is projected to increase with weather pattern changes due to climate change.^[5] As many tramp species are well adapted to disturbances in their native habitat, they are particularly resilient to large-scale, unpredictable weather events (such as floods, wildfires and monsoons), which are set to increase in frequency as anthropogenic activity continues to affect global systems.^[5]

Effects on local environments

Tramp species can have similar effects to invasive species, and in some literature the term "tramp" species is used as a synonym for invasive.^[14]^[15]^[6]^[5] As such they can outcompete and displace local fauna, decreasing species richness.^[13]^[9]^[8] They can also have direct impacts on human health, such as is the case with Solenopsis geminata and Pachycondyla senaarensis.^[9] Both of these venomous species have been known to bite humans, often times causing severe anaphylactic reactions; this has made them known public health hazards in the regions they are found.^[16]^[17]^[18] Tramp species can also be nuisance pests, damaging housing structures and crops.^[11]^[9] However, it is important to note that tramp species are not always invasive, and can cohabitate without harming local environments or species assemblages.^[8]

Control and eradication

As tramp species are so diverse in their ecology, there is no universal protocol to prevent their encroachment into new territories. However, there are certain strategies that can be employed to mitigate tramp species. In some environments, maintaining diversity of local species assemblages can deter certain tramp species.^[6] Currently, there is a deficiency in our ability to identify potential new tramp species quickly - a phenomenon dubbed "taxonomic impediment", which is a delay in identifying invasive species threats.^[5] As such, it is essential to increasing identification tools for preventative action against tramp species.^[5] Interdepartmental cooperation for pest management can be very effective in tramp species management, as a collaborative effort between affected stakeholders can increase the likelihood of success in mitigation.^[11] Direct pest management efforts have included baits with insect growth regulators to sterilize colonies to varying degrees of success.^[19] One method that can be successful for urban infestation of tramp ants specifically (depending on their specific biology) in temperate zones is to shut off heat sources for two weeks or more, as many can be heat-adapted species.^[8]^[20]