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Diversity of Life II Notes Week 9

by: Jacob Erle

Diversity of Life II Notes Week 9 211

Marketplace > Syracuse University > Foreign Language > 211 > Diversity of Life II Notes Week 9
Jacob Erle
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About this Document

These notes are on Dr. Adams last lecture on insect orders, including the different roles they play in our lives (Rocky Mountain Locust), and Dr. Ringler's talk on Aquatic Insects.
Diversity of Life II
Justine Weber
Class Notes
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This 9 page Class Notes was uploaded by Jacob Erle on Friday March 25, 2016. The Class Notes belongs to 211 at Syracuse University taught by Justine Weber in Spring 2016. Since its upload, it has received 59 views. For similar materials see Diversity of Life II in Foreign Language at Syracuse University.


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Date Created: 03/25/16
Diversity of Life II Notes Week 9 3/22/16 Insects Continued Lepidoptera (scale/wing) – Butterflies, Moths ­membranous wings, body and legs covered in scales ­siphoning mouthparts in adults (liquids, even decomposition), chewing seen in larvae ­forewings and hindwings linked to moved synchronously  ­Butterflies have hook antennae, Moths more brushy; Moths more nocturnal, butterflies are  diurnal ­Use color for recognition, camouflage, finding mates ­“Startle mechanism” ­ sudden flash of bright colors to deter predators ­antennae have greatly increased surface area for sensing environmental + chemical cues Hymenoptera (membrane/wing) – Sawflies, horntails, wasps, bees, ants ­Hindwings smaller than forewings – strong fliers ­Margin with row of attachment hooks ­ Hamuli ­Mesothorax with principal flight muscles ­ovipositor modifications, saw­like or stinger Suborder Symphyta are most primitive ­throax and abdomen broadly joined ­larvae with abdominal prologs ­saw­like ovipositor (saw through vegetation to lay eggs) ­often herbivorous, fungivores (young laid in vegetation or fungi will have food source  until really to hatch) ­have 4 wings (true flies have 2) Suborder Apocrita is more advanced ­petiolate (long, narrow/cylindrical) abdomen st nd ­pinched between 1  and 2  abdominal segments  abdominal mobility Infraorder Aculeata ­ modified ovipositor into stinger (Chrysididea, Apoidea and  Vespoidea) ­parasitoids, singularly devoted to pest control ­many have vivid coloration, some only several millimeters long ­area between thorax and abdomen used for ID ­only reproductive ants have wings, worker ants have no wings Pollination (entomophily) ­pollinate crops, which make up ~1/3 of our diets ­pollinate some tree species ­pollinate many food source plants of ‘biological controls’ ­bees are specially equipped for dealing with flowers – mouthpart with long tongues, barbed  hairs on legs ­Honey (“regurgitated bee spit”) –sequesters nectar in gut to swallow pollen, gives it to other  bees to convert to honey The Unfamiliar World of Insects ­ Metamorphosis  nd th Instar  Molt  2  instar  Molt (n  instar) Final Molt  Adult Stage Hemimetabolous – gradual metamorphosis  ­immatures resemble adults (grasshoppers, true bugs) ­wings, when present, develop externally and gradually while immature (Exopterygota) ­habitats very similar between juveniles and adults ­13 orders including Hemioptera and Coleoptera Holometabolous – complete metamorphosis, Pupal Stage (not seen in hemimetabolous) ­immatures appear different from adults ­Endopterygota – no wingpads, wings will develop internally ­habitats are very different ­orders considered most advanced Mouthparts and Feeding Adaptations Chewing (Beetle) ­parts move side­side ­mandibles can have teeth (some kind of ‘metal’ to chew tougher material) Sponging­lapping mouthparts (Flies) ­mouthpart has lines of channels along surface for drawing liquid into them Cutting­sponging­lapping (horseflies) ­will pierce into skin to suck up blood  Piercing­sucking (Hemiptera, true bugs) ­elongated mouthpart for generally plants but can be animals too ­feeding tube or sheath secreted to protect mouthparts during piercing action; also controls flow of liquid into body pharyngeal pump and/or cibarial pump (vacuum, feeds at negative pressure) Ex. Hemlock Wooly Adelgid – insert ‘fishline’ into plants Ex. Stable fly (house fly) – no labellum, vestigial  ­Mosquitoes have some of the most specialized insect mouthparts (modified maxilla to protect  mandibles) ­Many bloodfeeders have special saliva (anticoagulants, anesthesia) to avoid detection and to  successfully suck out a meal Siphoning (Lepidoptera) ­unfurled using hydrostatic pressure; can give insect great range while feeding on liquids (nectar) Insect/Human Interaction Food resource ­contain all essential amino acids ­higher protein than plants ­less direct competitions for same food resources Entomophagy is common in many places around the world, but not so much in US Competition for food/Agricultural Entomology ­corn beetle feeds on parts of corn plant, issue seen in Midwest (especially in monocultures) Stored Product Pests ­pet food, canned food Locusts (group of grasshoppers) ­most notorious herbivorous insect, seen in swarms that will consume virtually anything in their  path ­exhibit swarming behavior in response to food shortage ­seen everywhere except North America and Antarctica 1874 – Rocky Mountain Locust swarms along Great Plains ­swarm estimated to be 198,000 square miles, calculate to be over 3 trillion insects ­would eat anything: salt, wood, even each other Last R.M. Locust was identified in 1902 Competition for fiber/Forest  ­can lead to tree mortality (carpet beetle, Emerald Ash Borer) Cultural Applications  ­boll weevil, even has musical application (The Boll Weevil Song) Insect and Disease/Medical Entomology ­Typhus, lice, mites – vectors specially adapted for disease transmission ­often thrives in poor sanitary conditions, tight human conditions Fleas – bubonic plaque (Black Plague) ­very thin and compact with backward facing hairs, useful for driving themselves into  human hosts Malaria 3/24/16 Biology of Aquatic Insects ­ Dr. Neil H. Ringler Success of Insects ­cuticle of chitin ­segmentation ­mouthparts with a variety of uses ­airtubes ­sensory organs ­metamorphosis ­small size Exopterygotera wings develop outside Endopterygoptera wings develop inside Morphology ­know parts of insect leg ­10 abdominal segments ­3 parts to thorax  Mouthparts – labrum (dorsal) and labium (ventral) ­shredders, collectors, scrapers, and predators Ephemeroptrera – Mayflies ­hemimetabolous (no pupal stage) insects  Significance – found throughout the world ­can be nuisance Geologic History – Paleozoic, Carboniferous ­925,000 described species worldwide and 8600 aquatic species described in N. America About 3000worldwide mayfly species Voltinism = # generations/year ­Most aquatic insects are univoltine = 1generation per year ­Semivoltine – generation time is more than one year Naiads – immature stage for mayfly Stages – larva (nymph­naiad), subimago (“dun”), imago (“likeness”, “spinner”) and egg ­can take12­25molts to next instar ­range from 5­33mm long ­temperature counts Habitat Partitioning between larvae ­substrate type, water velocity, food availability, temperature and oxygen Imago does 1 final mold (delicate, elongate) before adult stage Genitalia used in species identification Wings have pleated veins, increase wing strength ­veins are equipped with nerve and tracheal tube that makes it strong but flexible; patterns vary and are used for identification ­Males swarm to find females, hold them from below ­Ephemeroptera (“live for a day on the wing”) ­flies swim to surface, inflate wings and emerge from nymphal skin ­able to even use eggs in identification  Odonata ­“toothed ones”, odonates  Dragonflies and Damselflies ­hemimetabolous, paleopterus (cannot fold wings) ­larvae and adults are both predatory ­aerial predators ­2 suborders, Anisoptera (Dragonflies) and Zygoptera (Damselflies) Significance ­largest, fastest and among the oldest (huge size in Carboniferous) Diversity – 5500sp worldwide, 650 in NA BOOK ­ Dragonflies of North America – look in Moon Library Zygoptera:  Calopterygidae, Coenagrionidae, Lestidae Anisoptera:  Aeschinidae, Corduligastridae, Corduliidae, Gomphidae, Libellulidae,  Macromiidae, Petaluridae Characteristics ­univoltine or semivoltine ­Zygoptera swim, Anisoptera jet in larval stage ­1 epiproct, 2 cerci and 2 paraprocts ­large diversity of antennae Emergence and Metamorphosis ­larvae crawl up from water (emergence typically nocturnal), inflate wings, and fly solo at dawn ­temperature counts BOOK ­ Dragonflies through Binoculars Wings have reduced density of veins; fast fliers Pre­reproductive period, <3weeks sheltered from water and wind Males transfer sperm from 9  to 2  segment in abdomen, which the female picks up on the end  of its own abdomen (“wheel organ”); male then grasps female behind head or on thorax Eggs deposited in water Have 30k sensory cells in eyes (ommatidia) Territory – area defended by males using wing warnings, abdominal displays Plecoptera ­ Stone flies “Pleated wing” ­hemimetabolous neopterans (able to fold wings into body) ­characterized by ‘weak­flying’ adults Significance ­essential part for structure and function of stream EPT – water quality and habitat assessment Ephemeroptera, Plecoptera and Trichoptera History ­ found since Permian Period Diversity – 3500species worldwide, 650 in North America ­Detailed survey in Adirondacks found 23species (9 very rare, extirpation risk) ­Nymphs are easily recognized Mouthparts – can be herbivorous or carnivorous (vary in mandible, maxilla and labium  morphology) Habitat ­cool, swift streams with stable substrate (utilize hyporheic zone) Life History ­oviposit – dip abdomen in water ­adults resemble larvae Exuvium – means adult has hatched Mating – some males have “dialect”, beat abdomen on substrate or vibrate ­eggs can be used for ID Trichoptera – Caddisflies ­named for Caddis­men (Shakespeare) ­hairy/tent­shaped wings “sedges”, related to butterflies ­holometabolous, silk­producing larvae ­larvae construct case made from environmental materials for protection (even used in jewelry)  ­Undergo differentiating metamorphosis ­use silk as safety line, trumpet net


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