®ring rates of the cells; (2) changing the levels of ex-
pression of tryptophan hydroxylase, the 5HT packaging
machinery, or the 5HT membrane transporter, all of
which would alter the size of the pool of 5HT available
for release; and (3) changing the distribution of amine
receptors on target neurons, which already has been
seen and documented as described above. Future studies
will be directed at the search for behaviorally linked
changes in neuronal function relating speci®cally to the
amine neurons.
Conclusions
Crustacean systems oer an exciting model with which to
explore the role of amines in a complex behavior like
aggression. Studies at many levels of analysis are possible
beginning at the behavioral, and including physiological,
morphological, biochemical and molecular approaches.
Much progress has been made in de®ning the important
components of the system of amine neurons in crusta-
ceans, and in learning how they function. We are poised
at the start of the investigation of how the behavior we
are studying in¯uences the function of these neurons,
and of how in turn, these neurons in¯uence the behavior.
Acknowledgements I thank Professor Jerey Camhi for inviting me
to present the King Solomon Lectures in Jerusalem, and for in-
cluding lobsters among the animals when ``he spoke of beasts and
birds and creeping things and ®shes'' (I Kings 15:13±14). Professor
Camhi could not have been a better host to my family and me. I
also thank the outstanding group of collaborators who have
worked with me on this project for almost 20 years now. I am very
appreciative of the present members of my laboratory (Alo Basu,
Stuart Cromarty, Georey Ganter) who took the time to read and
correct this manuscript for me. The work was supported initially by
NIH and in recent years by NSF (grant numbers IBN 9601288 and
IBN 9728551).
References
Ache BW, Munger S, Zhainazarov A (1998) Organizational com-
plexity in lobster olfactory receptor cells. Ann NY Acad Sci
855: 194±198
Adamo SA, Linn CE, Hoy RR (1995) The role of neurohormonal
octopamine during ``®ght or ¯ight'' behavior in the ®eld cricket
Gryllus bimaculatus. J Exp Biol 198: 1691±1700
Adams WB, Levitan IB (1982) Intracellular injection of protein
kinase inhibitor blocks the serotonin-induced increase in K
+
conductance in Aplysia neuron R-15. Proc Natl Acad Sci USA
79: 3877±3880
Aghajanian GK, VanderMaelen CP (1982) Intracellular identi®-
cation of central noradrenergic and serotonergic neurons by a
new double labeling procedure. J Neurosci 12: 1786±1792
Aghajanian GK, Sprouse JS, Sheldon P, Rasmussen K (1990) Elec-
trophysiology of the central serotonin system: receptor subtypes
and transducer mechanisms. Ann NY Acad Sci 600: 93±103
Aitken AR, Tork I (1988) Early development of serotonin-
containing neurons and pathways as seen in wholemount
preparations of the fetal rat brain. J Comp Neurol 274:
32±47
Altman JS, Kien J (1987) A model for decision making in the insect
nervous system. In Ali MA (ed) Nervous systems in inverte-
brates. Plenum Press, NewYork, pp 621±643
Arnold AP, Breedlove SM (1985) Organizational and activational
eects of sex steroids on brain and behavior: a reanalysis. Horm
Behav 19: 469±498
Asmus SE, Newman SW (1993) Tyrosine hydroxylase neurons in
the male hamster chemosensory pathway contain androgen
receptors and are in¯uenced by gonadal hormones. J Comp
Neurol 331: 445±457
Atema J, Cobb JS (1980) Social behavior. In: Cobb JS, Phillips BF
(eds) The biology and management of lobsters, vol I. Academic
Press, New York, pp 409±450
Baro DJ, Cole CL, Zarrin AR, Hughes S, Harris-Warrick RM
(1994) Shab gene expression in identi®ed neurons of the pyloric
network in the lobster stomatogastric ganglion. Receptors
Channels 2: 193±205
Baro DJ, Cole CL, Harris-Warrick RM (1996a) The lobster shaw
gene: cloning, sequence analysis and comparison to ¯y shaw.
Gene 170: 267±270
Baro DJ, Cole CL, Harris-Warrick RM (1996b) RT-PCR analysis
of shaker, shab, shaw, and shal gene expression in single neurons
and glial cells. Receptors Channels 4: 149±159
Battelle BA, Kravitz EA (1978) Targets of octopamine action in the
lobster: cyclic nucleotide changes and physiological eects in
haemolymph, heart and exoskeletal muscle. J Pharmacol Exp
Ther 205: 438±448
Beaudet A, Descarries L (1978) The monoamine innervation of rat
cerebral cortex: synaptic and non-synaptic axon terminals.
Neuroscience 3: 851±860
Beltz BS, Kravitz EA (1983) Mapping of serotonin-like immuno-
reactivity in the lobster nervous system J Neurosci 3: 585±602
Beltz BS, Kravitz EA (1987) Physiological identi®cation, mor-
phological analysis and development of identi®ed serotonin-
proctolin containing neurons in the lobster ventral nerve cord.
J Neurosci 7: 533±546
Beltz BS, Pontes M, Helluy SM, Kravitz EA (1990) Patterns of
appearance of serotonin and proctolin immunoreactivities in
the developing nervous system of the American lobster.
J Neurobiol 21: 521±542
Beltz BS, Helluy SM, Ruchhoeft ML, Gammill LS (1992) Aspects
of the embryology and neural development of the American
lobster. J Exp Zool 261: 288±297
Beltz B, Richards K, Marder E (1998) The serotonin transporter
and receptor mature prior to serotonin appearance in embry-
onic STG: a borrowed transmitter hypothesis. Soc Neurosci
Abstr 24: 107
Bennett-Clarke CA, Leslie MJ, Chiaia NL, Rhoades RW (1993)
Serotonin 1B receptors in the developing somatosensory and
visual cortices are located on thalamocortical axons. Proc Natl
Acad Sci USA 90: 153±157
Bennett-Clarke CA, Chiaia NL, Rhoades RW (1996) Thalamo-
cortical aerents in rat transiently express high-anity seroto-
nin uptake sites. Brain Res 733: 301±306
Bicker G, Menzel R (1989) Chemical codes for the control of be-
havior in arthropods. Nature (Lond) 337: 33±39
Boistel J, Fatt P (1958) Membrane permeability change during
inhibitory transmitter action in crustacean muscle. J Physiol
(Lond) 144: 176±191
Bonson KR, Johnson RG, Fiorella D, Rabin RA, Winter JC
(1994) Serotonergic control of androgen-induced dominance.
Pharmacol Biochem Behav 49: 313±322
Breithaupt T, Lindstrom DP, Atema J (1999) Urine release in freely
moving catheterized lobsters (Homarus americanus) with refer-
ence to feeding and social activities. J Exp Biol 202: 837±844
Buznikov GA, Shmukler YB, Lauder JM (1996) From oocyte to
neuron: do neurotransmitters function in the same was
throughout development? Cell Mol Neurobiol 16: 533±558
Callaway JC, Stuart AE (1999) The distribution of histamine and
serotonin in the barnacle nervous system. Microsc Res Tech 44:
99±104
Cases O, Vitalis T, Seif I, De Maeyer E, Sotelo C, Gaspar P (1996)
Lack of barrels in the somatosensory cortex of monoamine
oxidase A-de®cient mice: role of serotonin excess during the
critical period. Neuron 16: 297±307
235