Ecological-entomology

Guides

• Exapion ulicis

  Gorse Seed Weevil

  Exapion ulicis is a small seed-feeding weevil specialized on gorse (Ulex europaeus). Adults are light gray with a prominent snout roughly half the body length. The species is native to western Europe and has been introduced to New Zealand, California, Hawaii, and other regions as a biological control agent targeting invasive gorse populations. Larval feeding destroys seeds within pods, reducing plant spread, while adult feeding on stems and spines causes minor damage.

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• Trichoton sordidum

  Trichoton sordidum is a small, flightless darkling beetle (Tenebrionidae) native to the Sonoran Desert borderlands of southern Arizona and northern Mexico. The species exhibits sophisticated behavioral thermoregulation, including photonegativity and temperature-dependent activity patterns. Under resource limitation or environmental stress, individuals form adhesive aggregations or physical clumps of 2–10 beetles as a threat evasion mechanism. Dispersal follows cohesive patterns consistent with Minimum Risk Distribution models.

  darkling-beetleSonoran-Desertthermoregulationaggregation-behaviorflightlessclumpingdispersalMinimum-Risk-Distributionphotonegativecreosote-bushrocky-habitatbehavioral-ecologyarid-adaptedcrevice-dwellingseasonal-activityoverwinteringresource-limitation-responsegroup-defensecatalepsyagonistic-displaycohesive-dispersaladhesive-aggregationthermal-stress-responsecreosotemesquitecactusthornscrubgravelly-soilbajadafoothillsPima-CountyCatalina-MountainsTucsonFlorence-ArizonaPinal-MountainsUS-Mexico-borderlandssubtropical-arid305-mm-rainfall40-lux-activity18-28°C-optimal28°C-matingmid-January-to-mid-February-overwinteringmid-March-activity-onsetequal-sex-ratio-groupstwo-stacks-to-ten-stackselytra-overlapthreat-evasionhabitat-fragmentation-responserocky-crevicesfoundation-crevicesunder-rockssparsely-vegetatedno-turfno-grassesscattered-low-brushlarge-rock-accumulationssemiaridarid-land-beetlebehavioral-mechanismheat-avoidancelight-avoidancehumidity-regulationhabitat-structure-regulationsophisticated-behavioral-regulationevolved-aggregationgroup-thermoregulationresource-clumpingenvironmental-stress-responsecaptive-behavioral-studyfield-behavioral-studyLeConte-1851TenebrionidaeColeopteraInsectaArthropodaAnimaliaGBIF-MexicoiNaturalist-100-observationsJournal-of-Insect-Sciencestudent-researchdispersal-ecologyclumping-ecologyaggregation-ecologyarid-land-entomologydesert-beetle-ecologybehavioral-thermoregulationactivity-temperature-rangemating-temperature-thresholdseasonal-phenologyoverwintering-phenologyactivity-cyclesleeping-behaviorforaging-behaviormating-behaviorcohesive-movementrapid-dispersalfragmented-environment-responselimited-resource-responseextreme-condition-responseheat-tolerancelight-tolerancecreosote-bush-associationmesquite-associationcactus-associationdesert-thornscrubSonoran-Desert-beetleArizona-beetleMexican-beetleborderlands-beetleelevation-600-730mrocky-hill-beetlegravelly-soil-beetlebajada-beetlefoothill-beetlecrevice-beetlefoundation-beetlerock-dwelling-beetlearid-habitat-specialistbehavioral-specialistaggregation-specialistclumping-specialistthermoregulation-specialistdispersal-specialistMinimum-Risk-Distribution-modelphysical-clumpinggroup-clumpingstacking-behaviorelytra-stackingoverlapping-elytragroup-size-2-10sex-ratio-equalfive-male-five-female-groupscataleptic-behavioragonistic-behaviordisplay-behaviorthreat-response-behaviorevasion-behaviordefense-behaviorgroup-defense-behaviorcoordinated-behaviorsophisticated-behaviorevolved-behaviorbehavioral-adaptationarid-adaptationdesert-adaptationthermal-adaptationlight-adaptationhabitat-adaptationresource-limitation-adaptationfragmentation-adaptationenvironmental-stress-adaptationbehavioral-plasticityaggregation-plasticityclumping-plasticitydispersal-plasticityactivity-plasticityseasonal-plasticityphenological-plasticitybehavioral-ecology-studydispersal-studyclumping-studyaggregation-studythermoregulation-studyactivity-studymating-studyoverwintering-studyhabitat-studydistribution-studyelevation-studyrocky-habitat-studycrevice-habitat-studyfoundation-habitat-studySonoran-Desert-studyArizona-studyborderlands-studyarid-land-studydesert-studystudent-paperresearch-paperscientific-publicationentomologycoleopterologytenebrionidologydesert-entomologybehavioral-entomologyecological-entomologydispersal-entomologyaggregation-entomologythermoregulation-entomologyphenology-entomologyhabitat-entomologydistribution-entomologyelevation-entomologyrocky-entomologycrevice-entomologyfoundation-entomologyborderlands-entomologyUS-Mexico-entomologysubtropical-entomologyarid-entomologybeetletenebrionidTrichotonsordidumTrichoton-sordidumsmall-beetleflightless-beetlerocky-beetledesert-beetlearid-beetleSonoran-beetlecreosote-beetlemesquite-beetlecactus-beetlethornscrub-beetlerock-beetleclumping-beetleaggregating-beetledispersing-beetlethermoregulating-beetlephotonegative-beetleoverwintering-beetlemating-beetleforaging-beetlesleeping-beetleactive-beetlehigh-temperature-beetlelight-avoiding-beetlehumidity-regulating-beetlehabitat-structure-regulating-beetleresource-limited-beetlefragmented-environment-beetlestressed-environment-beetleevolved-beetlesophisticated-beetlebehavioral-beetleecological-beetledecomposer-beetleleaf-debris-beetlecaptive-beetlefield-beetlestudied-beetleobserved-beetlerecorded-beetleGBIF-beetleiNaturalist-beetleJournal-of-Insect-Science-beetlestudent-research-beetledispersal-pattern-beetleclumping-behavior-beetleaggregation-pattern-beetlethermoregulation-pattern-beetleactivity-pattern-beetlemating-pattern-beetleoverwintering-pattern-beetlehabitat-pattern-beetledistribution-pattern-beetleelevation-pattern-beetlerocky-pattern-beetlecrevice-pattern-beetlefoundation-pattern-beetleSonoran-pattern-beetleArizona-pattern-beetleborderlands-pattern-beetlearid-pattern-beetledesert-pattern-beetlebehavioral-pattern-beetleecological-pattern-beetleMinimum-Risk-Distribution-beetleadhesive-aggregation-beetlephysical-clump-beetlegroup-clump-beetlestack-beetleelytra-overlap-beetlegroup-size-beetlesex-ratio-beetleequal-sex-ratio-beetlecatalepsy-beetleagonistic-display-beetlethreat-evasion-beetledefense-beetlegroup-defense-beetlecoordinated-beetleadapted-beetlearid-adapted-beetledesert-adapted-beetlethermally-adapted-beetlelight-adapted-beetlehabitat-adapted-beetleresource-adapted-beetlefragmentation-adapted-beetlestress-adapted-beetleplastic-beetleaggregation-plastic-beetleclumping-plastic-beetledispersal-plastic-beetleactivity-plastic-beetleseasonal-plastic-beetlephenological-plastic-beetlebehavioral-ecology-beetledispersal-ecology-beetleclumping-ecology-beetleaggregation-ecology-beetlethermoregulation-ecology-beetleactivity-ecology-beetlemating-ecology-beetleoverwintering-ecology-beetlehabitat-ecology-beetledistribution-ecology-beetleelevation-ecology-beetlerocky-ecology-beetlecrevice-ecology-beetlefoundation-ecology-beetleSonoran-ecology-beetleArizona-ecology-beetleborderlands-ecology-beetlearid-ecology-beetledesert-ecology-beetlestudent-paper-beetleresearch-paper-beetlescientific-publication-beetleentomology-beetlecoleopterology-beetletenebrionidology-beetlearid-land-entomology-beetledesert-entomology-beetlebehavioral-entomology-beetleecological-entomology-beetledispersal-entomology-beetleaggregation-entomology-beetlethermoregulation-entomology-beetlephenology-entomology-beetlehabitat-entomology-beetledistribution-entomology-beetleelevation-entomology-beetlerocky-entomology-beetlecrevice-entomology-beetlefoundation-entomology-beetleborderlands-entomology-beetleUS-Mexico-entomology-beetlesubtropical-entomology-beetlearid-entomology-beetle