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Hormones and Behaviour. Endocrine vs Exocrine Hormones and Behaviour The Endocrine Glands (Invertebrates) Neurosecretory cells Corpora cardiaca Corpora.

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Presentation on theme: "Hormones and Behaviour. Endocrine vs Exocrine Hormones and Behaviour The Endocrine Glands (Invertebrates) Neurosecretory cells Corpora cardiaca Corpora."— Presentation transcript:

1 Hormones and Behaviour

2 Endocrine vs Exocrine

3 Hormones and Behaviour The Endocrine Glands (Invertebrates) Neurosecretory cells Corpora cardiaca Corpora allata Prothoracic gland Gonads

4 Hormones and Behaviour The Endocrine Glands

5 Hormones and Behaviour Tobacco Hornworm

6 Hormones and Behaviour Tobacco Hornworm - Moulting EH Stimulates Ventromedial neurons (Brain) ETH (Eclosion Triggering Hormone) Inka cells on trachea Pre-Moult Behaviour Falling ecdysone Segmental Glands CCAP (Crustacean cardioactive peptide) CNS Ecdysis behaviour Peripheral NS Change in circulation And air swallowing Surge in EH/ETH

7 Hormones and Behaviour Hypothalamopituitary system

8 Endocrine Glands - What do they do GlandHormoneEffect PinealMelatoninAnnual reproductive cycle Posterior PituitaryOxytocin, vasopressinMilk ejection, birth, water balance Anterior pituitaryLuteinizing hormone (LH)Corpora lutea formation Progesterone secretion Androgen secretion Follicle stumulating hormoneFollice development Ovulation (with LH and estrogen.) Spermatogenesis ProlactinMilk secretion Parental behaviour (birds) Adrenocorticotropic hormone(ACTH)Regulates adrenal glands Intermediate pituitaryMelanophore stimulating hormoneColour change Adrenals(cortex)SteroidsWater balance, metabolic rate, electrolyte balance, blood sugar, stress reaction Adrenals (medulla)Adrenaline, noradrenalineBlood sugar, stress reaction PancreasInsulinBlood sugar TestesAndrogensTestis development, sexual activity, spematogenesis OvariesEstrogensUterine growth, mammary gland development, sexual activity Progesteronesgestation

9 Hormones and Behaviour Anolis Lizards 1. Surgical Studies

10 Hormones and Behaviour Anolis Lizards Mean number of displays/min Time CastrationAndrogens replaced 1. Surgical Studies

11 Hormones and Behaviour Song Sparrows 2. Correlational Studies

12 Hormones and Behaviour Song Sparrows 2. Correlational Studies Plasma Testosterone level FMAMJJASFMAMJJAS TerritoryPair formation Egg-laying Brood 1 Egg-laying Brood 2

13 Hormones and Behaviour How Effect is Brought About Generally Stimulus CNS Hormone secreting cells Behaviour

14 Hormones and Behaviour Modes of Action 1. Modifier of Behaviour Female needs blood to develop ovaries -biting behaviour of mosquitos Feeds Blood meal Ovarian development begins Ovaries produce ecdysone Inhibits

15 Hormones and Behaviour Modes of Action 2. Releaser of Behaviour Among invertebrates - Moth - eclosion hormone (EH) EH produced in brain & corpora cardiaca Turns on sequence of behaviour Among vertebrates - general scheme Stimuli Nervous system (Hypothalamus) Pituitary Endocrine gland Behaviour

16 Hormones and Behaviour Effects of Hormones 1.Influence on releasers e.g. secondary sexual characteristics - sexual swelling in female baboons

17 Hormones and Behaviour Effects of Hormones 2. Influence on receptors e.g. sensitivity of brood patch

18 Hormones and Behaviour Effects of Hormones 3. Activation of neuron groups e.g. eclosion behaviour of moths - activated by nerves on specific segments

19 Hormones and Behaviour Effects of Hormones 4. Effects on brain structure e.g. Ventral hyperstriation in female canaries

20 Hormones and Behaviour Effects of Hormones 5. Hormone release controlled by behaviour Red Deer - roaring by males influences estrous

21 Hormones and Behaviour Effects of Hormones 5. Hormone release controlled by behaviour Red Deer - roaring by males influences estrous Cumulative % calving Date Exposed to vasectomized and roaring male Exposed to tape of roaring male Isolated females

22 Photoperiod increases Reproductive behaviour of the Ring Dove Male Female Testosterone increases Female present Male courtship Activate hypothalamus Pituitary FSH Egg growth Gonadal estrogens Nest building & copulation Pituitary LH Progesterone (testis) Ovulation Inhibits testosterone action Block courtship & aggression Pituitary prolactin Prolactin productionprogesterone Egg incubation Stimulates more prolactin Crop milk Squab feeding drop in prolactin

23 Egg laying in Aplysia

24 When ready to lay eggs Stops moving and eating Increase in heart and respiration rate Muscles on reproductive tract contract Eggs appear - egg string Grabs string in upper lip Waves head in stereotyped fashion Pulls string and coats with mucous Attach to rock

25 Egg laying in Aplysia

26 When ready to lay eggs Stops moving and eating Increase in heart and respiration rate Muscles on reproductive tract contract Eggs appear - egg string Grabs string in upper lip Waves head in stereotyped fashion Pulls string and coats with mucous Attach to rock Fixed Action Patterns

27 Egg laying in Aplysia Genes/nerves hormones ELH (egg laying hormone) gene Produces one large protein (codes for 271 amino acids) Protein broken down to ELH - bag factor Also involved - peptide A and peptide B

28 Egg laying in Aplysia Peptide A and Peptide B Stimulate bag cells (clusters of neurons) Release ELH Hormone -increases contraction rate of reproductive tract muscles Increases firing rate of abdominal ganglion Release - bag factor and - bag factor Excitatory ( and Inhibitory ( effects ? Probably coordinate firings for FAPs

29 Hormones and Mating Crews (84, 87) GonadalActivityGonadalActivity Time Constant Associated Dissociated

30 Hormones and Mating Associated

31 Hormones and Mating Disassociated Thamnophilis sirtalis parietalis

32 Hormones and Mating Disassociated Thamnophilis sirtalis parietalis Males emerge early spring Females emerge over next 1-3 weeks Females mate with males waiting at nest entrance Males mature gonads weeks later & store sperm Females mature gonads immediately to produce eggs

33 Hormones and Mating Crews (84, 87) Constant Taeniopygia guttata castanotis

34 Hormones and Mating Crews (84, 87) Constant Taeniopygia guttata castanotis Dry Water Humidity Grass Water/Humid Water/Grass Humid./Grass Water/Humid./Grass LH Level (ng/ml)


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