What is an organism? David C. Queller Joan E. Strassmann Washington University in St. Louis
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1 What is an organism? David C. Queller Joan E. Strassmann Washington University in St. Louis
2 Paradigm organisms Functional integration Physical contiguity Indivisibility Genetic uniformity Development from a single cell Genetic co-transmission Membership in the same species Early germ-soma separation Stable membership
3 Sociality and cooperation
4 The major transitions of life have increased cooperation at higher levels while reducing conflict at lower ones Gene Prokaryotic cell Eukaryote Cell Individua l Superorganism
5 Liberté, egalité, fraternité
6 Examples Fraternal Individuals in colonies, Cells in individuals, Same organelles in cells Egalitarian Nucleus and organelles, Sex, Genes in chromosomes Units Like, exchange able Unlike, not exchangeab le Reproductive division of labor Initial advantage Control of conflicts Increase in complexity Yes Economies of scale Kinship Epigenesis No Division of labor Mutual dependen ce Symbiosis Queller 1997 Q. Rev. Biol. 72:
7
8 The social organism High (actual) cooperation among parts and Low (actual) conflict among parts A consolidated bundle of adaptations The organism is a unit of near unanimous design
9 Actual or potential cooperation and conflict Potential cooperation and conflict can be assessed via degree of genetic similarity, degree of interdependence, degree of co-reproduction But those are more properly viewed as theoretical explanations for actual behavior
10 More cooperation Less cooperation More conflict Less conflict
11
12 Why do we care? Highest form of social cooperation Most salient features of the organization of life Adaptation - different from chemistry/physics Tend to be bundled Major transitions
13 Groups of cells
14 More cooperation More conflict Biofilm E. coli bacteriocin producer Yeast flocs Tasmanian devil Plasmodium in mosquito Myxococcus Whale Marmoset Volvox Dictyostelium Gonium Mouse Nematode Redwood Liverwort Trichoplax Less conflict Chlamydomonas Less cooperation
15 Currently ignoring conflict between genes Meiotic drive Imprinting Transposition Cytoplasmic male sterility
16 Whale Mouse Nematode Only cell conflicts considered
17 Redwood, Liverwort
18 Trichoplax
19 Volvox, Gonium, Chlamydomonas
20 Dictyostelium Organism by aggregation
21 Marmosets Ross et al 2007 PNAS 104: 6278 Fraternal twins chimeric Some within-individual conflict?
22 Tasmanian devil Contagious facial cancer
23 Plasmodium (malaria) in mosquito vector
24 Groups of multicellular individuals
25 More cooperation More conflict Human city Polistes wasp Barn swallow mates Naked mole rat African wild dog Chimpanzee Drosophila mates Bedbug mates Gull colony Human band Melipona bee Albatross mates Honey bee Botryllus Brain fluke in ant Man of war Anglerfish mates Social aphid Less conflict Strawberry clone Sage grouse lek Male fig wasp Aphid clone Dandelion clone Less cooperation
26 Portuguese man of war Organism made of many animals
27 Botryllus x
28 Polistes Naked mole rats African wild dogs x
29 Melipona stingless bees x
30 Honey bee Superorganism = Organism
31 Human city Human tribe x
32 Aphid clone x
33 Social aphid clone Superorganism, disconnected parts
34 Brain flukes in ant Dicrocoelium dendriticum
35 Barn swallow mates Bedbug mates x
36 Anglerfish mates
37 Albatross mates x
38 Can an organism really form from two unrelated individuals? Yes.
39 Two-species groups (no kinship)
40 More cooperation Host-mitochondrion Legume-Rhizobium Yucca moth-yucca Cleaner fish-host Plant-pollinator Ant-aphid Atta-fungus Fig-wasp Squid-vibrio Buchnera-aphid Lichen Grass-endophyte More conflict human-helminths Oxpecker-ox Ant-captive worker Malaria-mosquito Warbler-cuckoo Wolbachia-arthropod Cattle egret-buffalo Katydid-wasp Less conflict Brain fluke-ant Lion-gazelle Less cooperation
41 Lion - gazelle
42 Plasmodium (malaria) - mosquito Brain fluke - ant
43 Cleaner fish - client
44 Mitochondrion - host
45 Buchnera - aphid Infects some only cells
46 Lichens Photos:Stephen/Sylvia Sharnoff Do not necessarily cospeciate
47 Squid - Vibrio Not vertically transmitted
48 Rhizobium - legume
49 Fig - Fig wasp
50 Plant - pollinator Yucca - yucca moth
51 High cooperation and low conflict are not the same Organismic cooperation but high conflict: (societies) Human societies Rhizobium-legume Organismic lack of conflict but low cooperation (simple groups): Aphid clone Cattle egret - buffalo
52 Can get organisms from either From societies by reduction of conflict: Honeybees Fig - fig wasp From simple groups by adding cooperation: Volvox Social aphids
53 Paradigm organisms Functional integration Physical contiguity Indivisibility Genetic uniformity Development from a single cell Genetic co-transmission Membership in the same species Early germ-soma separation Stable membership
54 Not required: Physical contiguity Honey bee Brain fluke in ant Albatross mates
55 Not required: Indivisibility Honey bee Squid - Vibrio
56 Not required: Genetic uniformity Anglerfish mates Dictyostelium Honey bee
57 Not required: Development from a single cell Dictyostelium Anglerfish mates Lichens
58 Not required: Same species Mitochondrion - host Aphid - Buchnera Lichens
59 Not required: Genetic co-transmission (long-term cospeciation) Fig - fig wasp Lichens
60 Not required: Genetic co-transmission (short-term) Lichens Squid - Vibrio
61 Factors favoring organismality: Synergistic benefits of cooperation: Fraternal: Accelerated returns Egalitarian: Complementary functions Outcome of organismality: bundles of adaptation Common Reproduction: Fraternal: Clonality Kin recognition Egalitarian: Co-replication Partner fidelity feedback Conflict resolution Majority party has power Power apportioned among committees Organismality: High cooperation Low conflict Division of labor Homeostasis Indivisibility Subordination of the parts to the whole Coordinated development Coordinated reproduction
62 Major transition
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