2 Morphology of the Honey Bee The honey bee has three body divisions Head Thorax Abdomen
3 Head Drawing modified from R. E. Snodgrass
5 Body Hairs
6 Morphology of the Honey Bee The head serves as the major sensory region of the body; eyes, antennae, sensory hairs. It also functions to ingest and digest food
7 Specialized Structures of the Honey Bee Visual perception occurs through ocelli and compound eyes Olfactory perception occurs via the antennae Mouthparts: chewing and lapping. They consist of paired mandibles and the proboscis
8 Eyes Compound eyes (2) Ocelli (3)
9 Eyes Ocelli light intensity, diurnal activity patterns, orientation Compound eyes worker: 6,900 hexagonal facets drones: 8,600 facets --Each facet has its own lens, pigmented cone, sensory cells --Mosaic image Sensory hairs Color vision- trichromatic vision
10 Simple eyes- ocelli Corneal lens Sensory rods Sensitive to many types of wavelengths, polarization, changes in light intensity
11 Compound eyes- ommatidium Corneal lens Crystalline cone Rhabdom- contains light sensitive pigments (rhodopsin) Axons leading to optic lobe Yellow cells are pigment cells that help to absorb light coming in from adjacent cornea
12 Color vision Trichromatic insects (honeybees) - three types of pigment receptors, like humans - can distinguish more Pigment receptors do not coincide with ours (Roy G. Biv)
17 Antennae Topochemical olfactory sense Carbon dioxide receptors Moisture levels Taste receptors Johnston s organ- flight speed
18 Mouthparts Labrum Mandibles Maxillae (w/ palps) Labium (w/ palps) proboscis (w/ glossa) Head H.A. Dade drawing R williamson photo
19 Mouthparts Mandibles Proboscis
20 Morphology of the Honey Bee The thorax is the locomotory region of the body, housing three pairs of legs and two pairs of wings
21 Specialized Structures of Honey Bees: Legs Worker forelegs are covered in hairs which help clean dust and pollen from head.
22 Specialized Structures of Honey Bees: Legs Worker middle legs are used to clean thoracic hairs and for transport
23 Specialized Structures of Honey Bees: Legs Worker hind legs have a corbicula or pollen basket which is used to collect and pack pollen and propolis
24 Specialized Structures of Honey Bees Wings: They have two pairs of wings that hook together via hamuli.
25 Flight Muscles
26 Specialized Structures of Honey Bees A workers wings beat at a rate of 200 cycles/sec. The average flight speed of a worker is 24 km/hr htm
27 wasp-waist Abdomen Drawing modified from R. E. Snodgrass
28 Specialized Structures of the Honey Bee: Abdomen Made up of seven visual segments Segments are made up of two plates connected by membranes which allow for expansion Contains most of the internal organs
29 The Abdomen: General Structure
30 Internal Adult Anatomy
31 The Digestive System: Honey Stomach or Crop This is a specialized expandable structure that holds and stores resources
42 Largest bee in the hive and each colony contains only one Most important function is to lay eggs, large ovaries, spermatheca A queen can live for up to 4 years and can lay over 1 million eggs during that time.
43 She is the mother of all members, uses chemical control to keep daughters in check All phenotypes or inherited traits come from her She and her daughters control the sex ratio within the hive
44 The quantity and quality of food royal jelly contains mandibular gland secretions
46 Haplodiploidy Unfertilized eggs become drones Fertilized eggs develop into workers or queens Haplodiploidy: Viable drones come from unfertilized eggs, females from fertilized eggs
47 Workers They are the smallest bees in the colony and they are female They perform many tasks in the hive: make honey, clean the hive, feed larvae and build wax comb They also forage for nectar, pollen, propolis and water outside the hive
48 Major Glands of the Head: Hypopharyngeal and Mandibular glands
50 Proteins expressed by the hypopharyngeal gland
51 What to feed the babies? A glandular secretion from the mandibular and hypopharyngeal glands of worker nurse bees
52 What to feed the babies? Hypopharyngeal gland secretions are clear and contain mostly proteins Secretions from the mandibular glands are white and contain lipids This mixture is called worker jelly
59 Dufour gland Defense and reproduction Nest recognition in other bees
60 The Stinger!!!!! Has barbs on the sting that saw into surface, which causes the honey bee to loose their sting after use Stinger is connected to a venom sac Venom is made up of proteins and peptides and can elicit an array of immune responses EgaE
64 Three important hormones control the molting process Brain releases Brain hormone (=PTTH) (Stored & secreted by Corpus cardiacum) In response to e.g. stretch receptors indicating cuticle is too tight (or other cues; see Gotthard reading) Released into hemolymph; acts on prothoracic gland, causing secretion of: Ecdysone (molting hormone)
65 Three important hormones control the molting process Brain releases Brain hormone (=PTTH) Ecdysone (molting hormone) Juvenile Hormone (JH)
66 Three important hormones control the molting process Ecdysone (molting hormone) Secreted by prothoracic gland (in prothorax) Into hemolymph; acts on epidermis: start the process, apolysis etc.
67 Third: Juvenile Hormone (JH) Secreted by corpora allata Into the hemolymph Level present in hemolymph determines whether molt is to another juvenile stage or a more advanced stage
68 Endocrine gland example
69 JH and age-based polyethism Methoprene caused dose-dependent changes in the timing and frequency of occurrence of four important age-dependent tasks: brood and queen care, food storage, nest maintenance, and foraging. These results support the hypothesis that JH is involved in the control of age polyethism.
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