Foraging and dominance Meat ant

worker foraging on vegetation

a diurnal species (active during day), meat ant shows minimal interaction nocturnal ant species when territories overlap. meat ant , other members of i. purpureus species group regarded dominant group of diurnal species in australia, highly active, aggressive, , have enormous geographical range. during day, bulk of workers attend , feed on honeydew secreted insects live on leaves of eucalyptus trees. these trees connected foraging trails formed meat ants, connect satellite nests part of single colony; these trails visible due absence of vegetation , lead important food , water sources. other workers in smaller numbers scavenge around nest area dead insects, or other proteinaceous foods bring colony. dominance clear when meat ants capable of finding food sources more ants, capable of displacing many ants , other insects. food sources discovered more rapidly , reduces foraging efficiency of other ants, including of iridomyrmex. however, ants such green-head ant (rhytidoponera metallica) not affected presence of meat ants , still successful in finding food sources. green-head ants general predators , forage singularly , cannot recruit other nestmates, unable defend food sources dominant ants. heavily rely on food source , impossibility of defending other ants may have led peaceful coexistence dominant species, including meat ants. means green-head ants avoid conflict meat ants. myrmicines, highly competitive, capable of defending foraging workers; rapid recruitment of nestmates , use of chemicals defence allows them withstand attacks meat ants. in particular, monomorium ants have been observed occupying baits regardless of presence or absence of meat ant. not case mealworms, have moderate success honey baits. in foraging areas meat ants excluded or not present, number of other ants observed far greater , activity dramatically increases. however, presence of meats ants not affect abundant species, , of time iridomyrmex ants increase foraging rate.

foraging trail satellite nest vaguely seen (top left)

the impact of meat ants on other species varies, depending on habitat , type of food source, , ecological role ant plays. deliberate exclusion of meat ants show not can alter amount of sources available, dynamics of resource use on entire outcrops. if present, meat ants rely on rapidly discovering food sources , retain dominance other ants cannot collect them, exploitation , interference helps displace other ants. habitat meat ants live in may affect dominance among fauna. less successful in complex habitats , more successful in open areas, allowing workers forage efficiently; example, workers forage around rocks , collect food sources more in contrast in vegetation. meat ants more dominant other i. purpureus species group members in non-complex habitats. meat ants larger other iridomyrmex species , can displace or kill trying compete food sources. similar behaviours among meat ants , iridomyrmex species have increased level of conflict among each other, in open habitats.

the rate of movement of workers associated temperature, , foraging workers leave nest after sunrise when nest warmed in morning. meat ants emerge , start foraging when temperatures approximately 14 °c (57 °f), capable of withstanding extremely hot temperatures, workers have been seen foraging in 43 °c (109 °f) heat. workers may forage several minutes when soil temperature above thermal limit @ 45.8 °c (114 °f). @ 50 °c (122 °f) (soil surface temperature), foraging activity reduced further. these ants exhibit high running speeds during hot days, speed decreases after temperatures of 50 °c due physiological stress put onto them. workers can withstand such temperatures exhibiting opportunistic thermal responses adjust behaviour in order handle high trail temperatures , alter thermal biology low temperatures. deliberately expose closely thermal maxima.

the success of meat ants depends on resource dealing with. in 1 study, removal of meat ants allowed successful foraging of iridomyrmex ants @ carbohydrate sources, not protein baits. success of ants did not increase mealworm baits, suggesting competition not occur between meat ants , other species, , factors, such food preference, may involved. in contrast camponotines , myrmicines, both of success affected @ numerous food sources meat ants present. camponotines exhibit no aggression , cannot defend themselves.