Sensationalism
Guides
Pacifastacus leniusculus
Signal Crayfish
The signal crayfish is a large North American freshwater crayfish introduced to Europe in the 1960s to replace declining native fisheries. It has become one of the most ecologically impactful invasive decapods in Europe, outcompeting native crayfish and serving as a carrier of crayfish plague (Aphanomyces astaci). The species establishes self-sustaining populations rapidly, with six age cohorts documented within a few years of introduction. It shows sex- and size-specific coloration patterns, with males displaying more saturated and brighter ventral claw surfaces than females, suggesting a role in intraspecific communication.
invasive-speciescrayfish-plague-carrierdecapodfreshwater-crustaceanconservation-concernspecies-of-Union-concernearly-detection-rapid-responseark-sitesecosystem-engineerbioaccumulationsexual-dimorphismnocturnal-activityinvasion-gradienttrappingelectrofishingeradicationMediterranean-invasionheadwater-threatnative-crayfish-displacementfisheries-introduction1960s-introductionEuropeJapanCalifornia-nativePacifastacusAstacidaeDecapodaMalacostracaArthropodaAphanomyces-astaciwhite-clawed-crayfishsignal-crayfishcontrol-planningremoval-actionscatch-per-unit-effortcolor-variationcarotenoidscamouflageconspicuousnessintraspecific-communicationelemental-accumulationcontaminanttrophic-levelmacroinvertebrateplant-detritusrifflestreamriverlaketributaryinvasion-frontcore-populationexploratory-behaviormigration-patternsontogenetic-color-changekick-samplingdetection-protocolfalse-negativeCataloniaItalyPortugalSpainPolandScandinaviaBritish-IslesSegura-RiverClitunno-RiverValla-streamRabaçal-RiverFosso-VecchioUnion-concernLIFE-IMAGINEeradication-attemptbiosecuritypathway-action-plansINNS-inspectorateenvironmental-DNAeDNAhost-pathogen-dynamicsconservation-translocationark-siteaggregates-levyenvironment-agencyBBC-wildlife-funddefrahabitats-directivefavourable-conservation-statusunfavourable-badextinction-riskfunding-cutsecosystem-serviceskeystone-specieswoodlandpollinationdecompositionnutrient-cyclingpredationwater-purificationcitizen-scienceex-situ-conservation-rearingzoosaquariaFen-Raft-SpiderPond-Mud-SnailLarge-Marsh-GrasshopperFreshwater-Pearl-MusselMarbled-White-ButterflySmall-Skipperclimate-changeassisted-colonizationrange-marginbiotic-responseabiotic-driverwarmingpollutioneutrophicationfunctional-traitthermal-limitembryogenesiscompetitive-advantagealien-aquatic-speciesartificial-light-at-nightnutrient-enrichmentbrown-troutbiological-controlclearance-rateparasite-loadsympatryglobal-invaderpredatory-interactionexperimental-approachepiphytic-algaesubmerged-plant-communitymolecular-toolsinformaticssocial-mediapooled-samplingintegrative-taxonomyhybridbryozoancost-efficient-methodologypolicy-effectivenesslegislative-toolsLIFE-INVASAQUAnetworkingpreventionawarenessmarine-protected-areacitizen-science-datanon-native-freshwater-fishknowledge-gapsinvasive-alien-freshwater-plantsnaturalised-plantsaquatic-habitatspot-plantshorticultureNew-Guinea-flatwormPartula-tree-snailsLob-wormLumbricus-terrestrisHarlequin-ladybirdOak-processionary-mothNew-Zealand-flatwormAustralian-flatwormLily-beetleRosemary-leaf-beetleSpanish-slugGirdled-snailAustralian-landhopperLight-brown-apple-mothAsian-hornetArgentine-antLinepithema-humileVespa-velutinaash-diebackHymenoscyphus-fraxineusFloating-PennywortGiant-HogweedChinese-Mitten-CrabEriocheir-sinensisBallast-Water-ConventionOffice-for-Environmental-ProtectionEnvironmental-Improvement-PlanGlobal-Biodiversity-Frameworkdelistinglistingrapid-responseGreat-Britain-Non-native-Species-StrategyNature-2030Wildlife-and-Countryside-LinkBuglifeinvertebrateconservationreintroductionreinforcementassisted-colonisationhabitat-managementgenetic-diversitydonor-stockstakeholder-collaborationNatural-EnglandeNGOlandownerpublic-engagementmedia-attentiontabloidsensationalismspidersize-of-ratsMarvellous-Mud-Snails-CornwallCitizen-ZooHop-of-Hopevolunteerex-situ-rearinglong-life-cycleglochidiasalmonid-fish-hostFreshwater-Biology-Associationjuvenile-musselhabitat-restorationmicro-habitatField-CricketWart-biter-Bush-cricketBarberry-Carpet-MothMarsh-Fritillary-ButterflyFisher's-Estuarine-MothSouthern-DamselflyWhite-faced-Darter-DragonflyPine-HoverflyDark-bordered-Beauty-MothMedicinal-LeechTadpole-ShrimpNetted-Carpet-MothLadybird-SpiderNarrow-headed-AntCumbriaDorsetDevonmicrohabitatlow-mobilitynatural-colonizationshort-haired-bumblebeeBombus-subterraneussub-optimal-managementBarberry-bushPaul-WaringBenoit-Guénardconservation-fundingvertebrate-biasinvertebrate-neglectbeaverCastor-fiberpine-martenMartes-martesbird-of-preyLarge-Blue-ButterflyPhengaris-arionChequered-SkipperCarterocephalus-palaemonmainland-Europenational-reintroductionlocal-reintroductiondonor-populationreceptor-sitecounty400-misolated-habitatEngland-Species-Reintroduction-Task-ForceKarim-Vahedhalf-a-centurydiverse-specieslogistically-easierguidelinescodegovernmenthabitat-conditionssite-conditionstargeted-habitat-managementmobilityrecoveryunsuccessful-caselack-of-genetic-diversityoptimal-managementestablishment-failurecareknowledgefunding-allocationPNASthreatened-species80%6%species-numbersimbalancelegislationwild-releasehigh-profilemain-imageDecticus-verrucivorusDr-Sarah-HenshallshareFacebookLinkedInTrinity-AudiotweetNEOBIOTA-2024Lisbon421-participants47-countriesinvasion-scienceaquatic-studiesmarinefreshwateroral-sessionposterworkshopNeoBiota-Special-IssueeditorialPedro-AnastácioFilipe-RibeiroPaula-Chainho23-papersfive-themes100th-issueZooKeysdigital-taxonomyenvironmental-stressorinvasion-successsalinitysea-level-riseAlternanthera-philoxeroidesstress-toleranceavoidanceesca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clavata
Jorō spider, Joro Spider, Parachute spider
Trichonephila clavata, commonly known as the Jorō spider, is a large orb-weaving spider native to East Asia that has become established as an invasive species in the southeastern United States since approximately 2010. First confirmed in Georgia in 2014, it has expanded rapidly across multiple states through a combination of ballooning dispersal and human-mediated transport. The species is notable for its substantial size, striking coloration, and extensive golden webs, but poses minimal risk to humans due to small fangs and docile behavior. Its physiological adaptations—including higher metabolic rate, faster heart rate, and greater cold tolerance than its congener Trichonephila clavipes—suggest potential for continued northward range expansion.
invasive-speciesorb-weaverballooningurban-wildlifebiological-controlcold-tolerancestartle-responsecannibalismkleptoparasitismJapanese-folkloreNephilidaeTrichonephilaspider-silkrange-expansionphysiological-adaptationurban-ecologyagricultural-pest-predatoriNaturalistGeorgiaMarylandEast-AsiaUnited-Statesspider-bitevenomdocilenon-aggressiveweb-architectureegg-sacoverwinteringsexual-dimorphismmetabolic-rateheart-ratefreeze-toleranceroad-ecologyprey-capturecompetitionnative-spider-impactspublic-perceptionmedia-sensationalismmanagementpesticide-alternativesbroom-removalornamentalstructural-pestornithologycardinalweb-strengthtrophic-interactionsDNA-metabarcodingdiet-analysisspecies-distribution-modelphysiological-entomologybehavioral-ecologyarachnologyballooning-dispersalhuman-mediated-dispersalhitchhikercargo-stowawayport-of-entryclimate-changewarmingnorthward-expansionDMVHoward-CountyElkridgeIlchesterWest-Elkridgebeech-forestsecondary-forestsuburbanroadsidetelephone-polestreetlampforest-edgedisturbance-toleranceprey-detectionvibrational-noiseauditory-disturbancemotionlessfreezingshynessHannibal-Lecterstink-buglanternflyevolutionary-historyancient-associationecosystem-servicebiocontrolnatural-enemyinvasive-pestbrown-marmorated-stink-bugspotted-lanternflyHalyomorpha-halysLycorma-delicatulacompetitive-exclusiondominant-orb-weaverabundantpopulation-growthrapid-spreadrange-span120,000-km2physiological-plasticitymetabolismtwice-as-high77%-higher-heart-rate74%-freeze-survivaldevelopment-rateseasonal-windowlife-cycle-completionthermal-limitationcongener-comparisonnatural-dispersalhuman-transportiNaturalist-recordcitizen-scienceconfirmed-sightingbreeding-populationmale-and-femalegravid-femaleegg-casestowawaycargo-containerport-introductionlocal-portvehicle-transporthitchhikingaccelerated-arrivalseveral-yearsnatural-meansprognosticationpredictionmodelsuitable-habitatabundant-suitable-habitateastern-North-Americawestern-North-Americapotential-rangeinvasive-rangepotential-impactenvironmental-impactecological-impactecosystem-impactmonitorcautiousevidence-basedreasonable-journalismsensationalismexaggerationuncritical-acceptanceharmlesscarefully-monitorednext-stepsresearch-opportunitycall-for-researchknowledge-gaplittle-knownnovel-ecosystemspreadingrapidly-expandinginvasive-predatorinvasive-orb-weavernon-nativeintroducedestablishedcolonizedthrivingdoing-finehappymerely-20-minutes-awayroad-tripvisitaccess-spreadbeech-leaf-diseaseBLDstate-forestremarkable-colonyamongst-beech-treesconfirmed-prognosticationDavis-and-Frickescape-relative-warmthexpand-range-northwardeastern-seaboardmerely-20-minutes-away-from-homeresist-opportunityamazing-predatorstales-of-arrivalprevious-episodes20222024reduce-angstlarge-non-native-spiderestablishing-in-DMVfacts-presentedpast-episodevenomous-terrible-painfulNahexpert-Rick-Hoebekerisks-smallpuny-fangsunlikely-pierce-skinvideocompletely-non-aggressiveeastern-Howard-Countyhaphazard-webslittered-with-remainsformer-victimsleavesshed-exoskeletonsmuch-larger-femaledwarfs-matepositioned-just-abovestrand-of-silkspinneretsunderside-of-abdomennear-red-moundrelative-to-handlarge-and-docilewait-and-seewhat-Jorō-means-to-ecosystemshelp-other-spidersput-a-beat-down-on-invasive-pestsstink-bugsspotted-lanternfliespassive-huntersenormous-webslarger-than-a-meter-in-diametercapture-prey-snared-in-silkarachnophobes-scaryarachnophiles-beautifulimportant-ecosystem-servicescrop-pestsnative-rangeAsiahaving-an-old-friend-over-for-dinnerreunitefirst-timelarge-spidersjuicy-prey-itemsfeathered-and-non-feathered-reptilesposes-no-known-threatdifficult-to-predict-impactnon-native-speciesexperts-suggestbeyond-scary-miengive-indigenous-large-orb-weavers-run-for-their-moneyblack-and-yellow-garden-spidermarbled-orb-weaverspotted-orb-weaverother-parts-of-worldmost-abundant-and-dominant-orb-weaverwhat-will-it-meanonly-time-will-tellfinal-tidbitJorō-shapeshifterJorō-gumobeautiful-womanseduces-menbinds-with-silkdevoursbad-dateacknowledgementsRick-Hoebekeidentifying-JorōinsightsDavid-CoyleBob-Bellingergreat-imagesknowledgestudiesVeni-vidi-viciNelsen-et-al.Physiological-evaluationNephila-clavata-newly-recordedHoebeke-et-al.Life-Cycle-Habitat-and-VariationMooreStartle-responsesDavis-and-AneraoHow-Urban-Tolerant-Are-TheyDavis-et-al.inspirationdetailsstarsDave-ClementMiri-TalabacMaddie-Potterhooked-up-with-colonydifferentiateresources.ipmcenters.orglinkJorō-guruDavid-Coyle's-takeYouTubecalm-your-fearsJournal-of-Economic-EntomologyJournal-of-Medical-Entomologychemical-management-strategieseffective-management-methodsspider-control-productssafe-and-effectiveunlikely-to-bitegenerally-harmlessbig-spiderscolorful-spidersinvasive-spidersin-your-face-spiderswebs-on-homeslandscape-plantsstructuresmiddle-of-where-people-live-work-and-playnorthern-Georgia-2014presumed-arrived-few-years-prior15-yearsincreased-dramaticallymuch-of-Southeastdisjunct-populationsnortheastern-U.S.firestorm-of-interestrapidly-expanding-rangesoutheastern-statesmany-countiesCarol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