_HERPETOLOGY_notes_msc_4semester_20240.pptx
- 1. 2018 Herpetology (B/C) KAREN LANCOUR National Bio Rules Committee Chairman [email protected]
- 2. Event Rules – 2018 DISCLAIMER This presentation was prepared using draft rules. There may be some changes in the final copy of the rules. The rules which will be in your Coaches Manual and Student Manuals will be the official rules.
- 3. Event Rules – 2018 BE SURE TO CHECK THE 2018 EVENT RULES FOR EVENT PARAMETERS AND TOPICS FOR EACH COMPETITION LEVEL The National Herpetology List is at www.soinc.org under Event Information
- 4. HERPETOLOGY (B&C) Content: Taxonomic Scheme of the 2018 Official Science Olympiad NATIONAL HERPETOLOGY List States may have their own State Herpetology List for regional and state competitions – see your state website. It should be posted by Nov. 1 Event Parameters: see 2018 Official Rules – Students may either use a published field guide or make their own binder for use in the competition. See the handout “Preparing a Resource Binder” to help make your own field guide.
- 5. The Competition Content: The competition may be a station event or it may be a power point competition The competition may cover identification, anatomy & physiology, reproduction, habitat characteristics, ecology, diet, behavior, ID calls, conservation, biogeography Process Skills: observation, inferences, data and diagram analysis
- 6. TRAINING MATERIALS Training Power Point – content overview Training Handouts - background information and guide to making a field guide. Sample Tournament – sample problems with key based upon the National Herpetology List Event Supervisor Guide – event prep tips, setup needs and scoring tips Internet Resources & Training Materials – on the Science Olympiad website at www.soinc.org under Event Information A Biology-Earth Science (2018) CD, and the Taxonomy CD (2016) are available from SO store at www.soinc.org
- 7. LEARNING THE REPTILES AND AMPHIBIANS Use a field guide or make your own field guide binder to assist you Learn the characteristics of the Classes, the Orders, and then the Families. Finally become familiar with the characteristics of the Genera within each Family
- 8. Game Plan 1. Use the POWERPOINT for an overview 2. Study the TWO HANDOUTS – for background information and as a guide to making a binder and learning the competition 3. Use the INTERNET RESOURCES and CD’S for more help – see the Science Olympiad National website at www.soinc.org under event information and the Science Olympiad store 4. Prepare a FIELD GUIDE, FIELD GUIDE BINDER and use OTHER TOOLS to LEARN THE AMPHIBIANS AND REPTILES and then MODIFY THE BINDER OR TAB THE FIELD GUIDE for effective use in competition 5. Do the SAMPLE TOURNAMENT under timed conditions to experience being timed in competition. 6. Prepare and do PRACTICE STATIONS, OLD TESTS, and INVITATIONALS –to master knowledge, teamwork, and using your binder effectively under timed conditions.
- 9. Field Guide or Binder Student may use a published field guide or they may make their own field guide binder as they did for Invasive Species. See the Handout on Making a Field Guide Binder to make your own.
- 10. Published Field Guides Some of the available field guides for Herpetology are outdated for the updated taxonomy. Be sure to check the national list for the current updated taxonomy. Be sure to check the publication date when choosing a resource to use. Field guides can still be good resource guides for other information. Most up-to-date field guides Peterson Field Guides - A Field Guide to Reptiles & Amphibians: Eastern and Central North America, 4th edition by Roger Conant and Joseph T. Collins (2016) Peterson Field Guides A Field Guide to Western Reptiles and Amphibians, by Robert C Stebbins (2003)
- 11. GENERAL TIPS - FIELD GUIDES Study the information in the front of the field guide Become familiar with the organization of the color plates in the field guide Notice how the field guide organization is similar to the organization of the Official Herpetology List Put the page numbers of Orders and Families Information from the Field Guide on the Official Herpetology List – it will save you a lot of time Tab the field guide with very small useful tabs so it is not cluttered and can be easily used Practice using the Field Guide to identify specimens or photos Practice under timed conditions to prepare for competition
- 12. Binder Tips – See handout on making a binder The most effective resources are the ones produced by the students The process of producing the resources is a major learning tool Have a copy of the rules in your binder Have a copy of the lists (herps, insects, birds, fossils if applicable) in your binder Prepare and organize materials by major topic divisions Place materials from many different sources into your topic divisions Reduce the size of pictures where possible to get more information on a page Color code information to help you locate or emphasize key items Put pages in sheet protectors – two per protector to save space Use tabs to separate sections Label tabs so items can be located with ease
- 13. Power Point Slides Make power point slides for Order, Family, and/or Species Make them like sample stations with pictures and questions Prepare them so they can be reorganized to make practice competitions for study
- 14. Flash Cards Make flash cards with pictures on one side and information on the back Use the flash cards to make up sample competitions Use the flash cards to learn the herps
- 15. Doing the Competition Place information in appropriate places on answer sheet Print legibly so information is understandable Work as a team – use time effectively Use Binder or Field Guide effectively Identify to Order and then to Family and Genus Be sure to spell names correctly Carefully read all questions and use common sense in answering Relax, Do your best, and Have Fun!!
- 16. Suggested Resources There is a list of internet resource links on the National Web site under events-Herpetology For additional information on Herp taxonomy, http://www.cnah.org/ Also see https://ssarherps.org/
- 17. State Resources Many states have Amphibian and Reptile resources and/or state lists plus guides. Check the web for state resources. Many commercial field guides are available. State DNR websites may also have resources.
- 18. Taxonomy Official National List for Classes – Amphibia or Reptilia Order /Suborder Family Common name
- 19. COMPARISON OF AMPHIBIANS AND REPTILES Introduction Amphibians mean living two lives (on land as well as on water). Amphibians usually have to stay near water sources to prevent drying out, they have moist glandular skin. Reptiles are groups of animals that breathe air, have scales and claws on their bodies, and may lay eggs or give birth. Examples of animals Frog, toad, and salamanders Snakes, lizards, crocodilians, turtles Method of Breathing Skin, gills and/or lungs Lungs Body Metabolism Ectothermic (cold-blooded) Ectothermic (cold-blooded) Metamorphosis Yes. Breaths in water through skin and gills until lungs develop. No. Looks like a miniature adult when hatched or born Defense Toxic skin secretions and can bite. No claws. Teeth may be present Nails and teeth (some have venom; Gila monster, beaded lizard, and many snakes). Some reptiles have scales, which act as a sort of armor to physically
- 20. COMPARISON OF AMPHIBIANS AND REPTILES -2 Heart structure 3-chambered: one ventricle and two atria One can say that the reptile heart has three chambers, two atria and one, partially divided, ventricle. Some reptiles have four- chambered hearts with two atria and two ventricles, but the wall between the ventricles is incomplete Limbs Short fore limbs and long hind limbs with five digits “sometimes webbed” Reptiles usually have four limbs, but some reptiles (snakes) have no limbs. Reptiles with limbs vary in their ability to move; some move very slowly and crawl, while others can run, jump, and even climb. One type of lizard can even run on water Skin Texture Smooth, moist and sometimes rather sticky skin (laden with mucous glands). Dry and scaly. Scales are made of keratin (protein). Skin is found underneath the scales. Eggs Have soft, gel surrounding their eggs without any hard Amniotic egg. Have hard or leathery eggs laid on land or they
- 21. Amphibians Up to four limbs without claws on toes Terrestrial adults have lungs instead of gills Both internal & external nares (nostrils) Three chambered heart (two atria & one ventricle) Double loop blood circulation to lungs & rest of body cells Live in moist or aquatic environments
- 22. Amphibians Most with smooth, moist skin to take in dissolved oxygen Some with oral glands to moisten food they eat Webbed toes without claws Ectothermic - body temperature changes with environment Show dormancy or torpor (state of inactivity during unfavorable environmental conditions) May hibernate in winter and aestivate in summer Aquatic larva called tadpole goes through metamorphosis to adult stage
- 23. Amphibians External fertilization with amplexus in frogs and toads (male clasps back of female as sperm & eggs deposited into water) also salamanders Eggs coated with sticky, jelly like material so they attach to objects in water & do not float away Eggs hatch into tadpoles in a few days Males frogs have vocal sacs to produce sound Digested system adapted to swallow prey whole
- 24. FROGS AND TOADS Frog skin smooth & moist for cutaneous respiration Toad skin is rough & warty with poison glands
- 25. Amphibians – Frogs & Toads ID Traits
- 26. Amphibians – Hind Feet a. True frogs – webbed toes b. Tree frogs – toe pads & sometimes webbing c. Toads – tubercles & reduced webbing d. Spadefoot Toads – thorny projections(spade) and reduced webbing
- 27. Characteristics of Frogs & Toads Tadpole with tail, gills, & two- chambered heart Adults without a tail, four limbs, & lungs Long hind limbs for jumping Long, thick tongue hinged at front of mouth
- 28. COMPARISON CHART FROGS AND TOADS Frog Toad Hind legs Long, powerful jumping legs Shorter legs for walking or hopping Eggs Frogs lay eggs in clusters, tadpoles live in water Toads lay eggs in long chains, most tadpoles live in water Skin Moist and smooth Dry and bumpy Characteristic Frogs live in or around water Toads live mostly on land Habitat Prefer moist environments Prefer drier environment but adapt to some moist conditions as well. Teeth Frogs have teeth in their upper jaw. Toads have no teeth. Eyes Eyes bulge out Eyes do not bulge out, prominent poison gland behind eyes Food Insects, snails, spiders, worms and even small fish Insects, grubs, slugs, worms, and other invertebrates
- 30. Salamanders Have elongated bodies with a tail & up to 4 limbs Smooth, most skin for cutaneous respiration Less able to stay on dry land than frogs and toads Nocturnal when living in drier areas Some species are permanently aquatic: “Mudpuppies, sirens, hellbenders, amphiumas & newts”
- 31. Reptiles – Terrestrial Adaptations Dry, watertight skin covered by scales to prevent desiccation (water loss) Toes with claws to dig & climb Geckos have toes modified with micro hairs on the surface to aid climbing Snakes use scales & well developed muscular & skeletal systems to move Ectothermic - body temperature controlled by environment May bask or lie in sun to raise body temperature or seek shade to lower body temperature “known as thermoregulation”
- 32. Reptiles – Terrestrial Adaptations Lungs for respiration Double circulation of blood through heart to increase oxygen to cells Partial separation in ventricle to separate oxygenated & deoxygenated blood Water conserved as nitrogen wastes excreted in dry, paste like form of uric acid crystals
- 33. Reptile Reproduction Advance Amniotic Egg Protective membranes & porous shell around embryo Shell may be hard or leathery & waterproof Egg is fertilized internally, before shell is formed
- 34. Crocodilians
- 35. Crocodiles & Alligators Carnivorous (wait for prey to come near & then aggressively attack) Eyes located on top of head so they can see when submerged Nostrils on top of snout to breathe in water Valve in back of mouth prevents water from entering airway when feeding underwater Both American species guard the nest & watch over of young Crocodiles (in salt water) are tropical or subtropical, occur in salty water and are usually nocturnal
- 36. Turtles – ID Features
- 37. Turtles (including Tortoises) Body covered with shell composed of hard plates & tough, leathery skin Carapace or dorsal surface of shell fused with vertebrae & ribs Plastron is ventral shell surface Shape of shell is modified for habitat Dome shaped shell helps to retract head & limbs in box turtles
- 38. Turtles Tortoise (dome-shape) Spotted turtle- Water dwelling (Streamlined for movement) Sea turtle (flippers)
- 39. Lizards – ID features
- 40. Lizards Most have four limbs, some have none Rely on speed, agility, & camouflage to catch prey Feed on insects & other small animals (including worms) Some, such as anole & chameleon, can change colors for protection May use active displays such as squirting blood, hissing, or inflating bodies Some can show autotomy (breaking off tail to escape predators) One venomous U.S. species - Gila Monster
- 41. Snakes – ID features
- 42. Snakes
- 43. Snakes 40 - 100 vertebrae with a pair of ribs & attached muscles for movement Move in 3 ways – lateral undulations, rectilinear, & side winding Lateral undulations most common Hearing is poor-snakes locate prey by vision or by chemical scents (using forked tongue) May inject venom or poison – hemotoxin (vipers) or neurotoxin (coral snakes) Constrictors wrap body around prey to suffocate them Snakes swallow prey whole – jaws may unhinge to swallow largest prey
- 44. Ecology Impacts Importance of ectothermy Economic value Bio-indicators Functional role in ecosystems Longevity of some species – 50+ yrs Status and conservation Habitat destruction
- 45. Decline of Amphibians Their highly permeable skin is more immediately sensitive to changes in the environment, including changes to freshwater and air quality Air and water pollution Habitats are being destroyed for human development Consumer demand
- 46. Decline in Reptiles, Turtles, Crocs Habitat loss & degradation Invasive Species Environmental Pollution Unsustainable use Global climate change Life history – some do not reproduce until later in life – some turtles 18 yrs. Top of food pyramid – indicators of environmental health Consumer demand – pets, food, etc.