Bet-hedging-strategy
Guides
Cordulegaster erronea
tiger spiketail
Cordulegaster erronea, the tiger spiketail, is a large, uncommon dragonfly in the family Cordulegastridae. It is a habitat specialist requiring small, pristine, spring-fed forest streams with muck bottoms and overhanging vegetation. The species has a long larval period estimated at 3-4 years and a brief adult flight period of approximately 2-3 weeks in early summer. Radio-telemetry studies in New Jersey have revealed limited adult movement, with individuals typically remaining within 100-200 meters of natal streams and showing strong site fidelity.
dragonflyspiketailhabitat-specialistforest-streamradio-telemetryconservationNew-JerseyCordulegastridaeOdonataindicator-speciesheadwater-streamsmetapopulationterritorial-behaviorcrepuscular-activitylong-larval-developmentsite-fidelitymature-forest-dependentspring-fed-streamsmuck-bottom-streamsoverhanging-vegetationshaded-streamslimited-dispersalfragmented-populationspristine-habitataquatic-nymphovipositorearly-summer-emergencebrief-adult-lifecanopy-useeasily-disturbedhuman-disturbance-sensitivetop-predatorstream-ecosystemconservation-concernIUCN-Least-Concernstable-populationeastern-North-Americapatchy-distributionlocalized-populationsterritorial-malespatrolling-behavioroviposition-in-organic-matterspecialized-habitat-requirementsforest-protection-neededregulatory-protection-insufficientaquatic-insectodonateAnisopteraCordulegastroideaSelys-1878tiger-spiketailuncommon-speciesrare-encountersfield-identification-challengehabitat-degradation-threatforest-fragmentation-impactwater-quality-dependentperennial-streamsseepage-fed-streamsadjacent-forest-usemovement-ecologyhome-range-limitednatal-stream-fidelityconservation-recommendationsmature-forest-bufferstream-corridor-protectionheadwater-conservationforest-stream-specialistecosystem-engineerbiodiversity-indicatorclimate-change-vulnerabilityhabitat-loss-sensitivitydevelopment-pressureprotected-areas-benefitcitizen-science-potentialnatural-history-knowledge-gapresearch-priority-speciesmonitoring-targetpopulation-stabilityleast-concern-statusno-immediate-threatstable-IUCN-assessmentNorth-American-endemiceastern-rangeNew-Jersey-study-sitedetailed-life-history-knownradiotelemetry-pioneer-studyfirst-radio-telemetry-for-speciesmovement-studyhabitat-use-studyhome-range-estimationconservation-biology-case-studyforest-management-implicationsbuffer-zone-requirementsstream-protection-needsbeyond-stream-corridor-protectionforest-matrix-importancecanopy-connectivityshade-requirementsthermal-regime-sensitivityhydrological-stability-needsmuck-substrate-preferenceorganic-matter-ovipositionspecialized-reproductive-behaviorterritorial-defensemale-male-competitionfemale-habitat-usenon-breeding-habitat-useforaging-in-canopyroosting-behavioractivity-patterncrepuscular-peakmorning-activitylate-afternoon-activityhuman-disturbance-responseflight-initiation-distanceconservation-behaviormanagement-recommendationspolicy-implicationsregulatory-gapprotected-area-designlandscape-conservationmetapopulation-dynamicssubpopulation-connectivitycolonization-extinction-dynamicshabitat-patch-sizehabitat-patch-qualityhabitat-patch-isolationpopulation-viabilitydemographic-stochasticityenvironmental-stochasticitygenetic-diversity-concernsinbreeding-riskdrift-effectsconservation-genetics-needslong-term-monitoringadaptive-managementhabitat-restoration-potentialreintroduction-feasibilitycaptive-propagation-unnecessaryin-situ-conservation-priorityex-situ-conservation-not-indicatedsite-based-conservationstewardship-needseducation-valuenatural-heritage-significanceecotourism-potential-limitedresearch-tourism-potentialphotography-challengefield-observation-difficultyelusive-specieslow-detection-probabilitysurvey-methodology-needsenvironmental-assessment-indicatorimpact-assessment-speciesdevelopment-review-triggermitigation-requirementscompensatory-habitat-needsoffset-feasibility-limitedno-net-loss-challengehabitat-irreplaceabilityconservation-offset-unsuitableprecautionary-approach-warrantedenvironmental-planning-integrationstrategic-environmental-assessmentcumulative-effects-assessmentclimate-adaptation-planningrefugia-identificationassisted-migration-not-appropriatehabitat-management-guidelinesforest-management-integrationsilviculture-impactsharvest-timing-restrictionsbuffer-retentionriparian-zone-widthcanopy-retentionroad-impactssedimentation-sensitivitynutrient-loading-sensitivitychemical-contamination-sensitivitythermal-pollution-sensitivityflow-alteration-sensitivitygroundwater-dependencebaseflow-maintenancehydrological-connectivitywetland-complex-associationseepage-zone-protectionheadwater-protection-prioritywatershed-scale-conservationlandscape-context-importancematrix-quality-effectsedge-effects-sensitivityfragmentation-impactscorridor-needsstepping-stone-habitatnetwork-connectivitypopulation-source-sink-dynamicsdemographic-source-populationsrescue-effectstargeted-conservation-actionspecies-specific-managementhabitat-suitability-modelingdistribution-modeling-needsoccupancy-modeling-potentialdetection-probability-estimationsurvey-design-optimizationmonitoring-protocol-developmenttrend-analysis-needspopulation-status-assessmentthreat-assessmentrecovery-planning-not-triggeredprevention-oriented-conservationproactive-managementearly-intervention-opportunityconservation-investment-efficiencycost-effective-protectionpriority-site-identificationconservation-opportunity-mappingland-protection-strategieseasement-potentialfee-simple-acquisitionstewardship-agreement-needsmanagement-agreement-needsconservation-par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hamamelidis
Witch-hazel Cone Gall Aphid
Hormaphis hamamelidis is a gall-forming aphid that induces distinctive red, cone-shaped galls on witch-hazel (Hamamelis virginiana) leaves. The species exhibits host alternation, with sexual reproduction and gall formation on witch-hazel in spring, followed by migration to birch (Betula) for parthenogenetic summer generations, and return migration to witch-hazel in autumn. Founding females (fundatrices) actively manipulate host plant phenolic metabolism, increasing condensed tannins and decreasing hydrolyzable tannins within galls to enhance their own reproductive success. Gall size, determined largely by fundatrix manipulation of plant growth, is the primary predictor of fundatrix fecundity rather than leaf position or plant vigor per se.
Trigonotylus caelestialium
Rice Leaf Bug
Trigonotylus caelestialium is a mirid plant bug known as the rice leaf bug, native to Europe, Northern Asia (excluding China), and North America. It is a multivoltine pest of rice in Japan, where it causes pecky-rice damage by feeding on developing grains. The species has a broad host range within Poaceae, utilizing various grasses as alternative hosts before invading rice paddies during the flowering stage.