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Evolution__3rd_Edition

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..<br />

(a)<br />

Plant<br />

( Bursera )<br />

sarukhanii<br />

submonliformis<br />

bipinnata<br />

asplenifolia<br />

velutina<br />

hintoni<br />

diversifolia<br />

biflora<br />

xochipalensis<br />

glabrifolia<br />

palmeri<br />

infiernidialis<br />

penicillata<br />

mirandae<br />

heteresthes<br />

bonetti<br />

cuneata<br />

aloexylon<br />

coyucensis<br />

paradoxa<br />

schlechtendali<br />

chemapodicta<br />

fagpurpusii<br />

ariensis<br />

discolor<br />

aptera<br />

trifoliolata<br />

morelensis<br />

suntui<br />

fragilis<br />

trimera<br />

denticulata<br />

crenata<br />

kerberi<br />

grandifolia<br />

atenuata<br />

arborea<br />

instabilis<br />

C. virgata*<br />

C. monstruosa*<br />

C. simplicifolia*<br />

Boswhildebrantii*<br />

spondias*<br />

(c) Beetle physiology, with host plant chemistry<br />

Insect … Plant<br />

flavocostata 1<br />

flavocostata 2<br />

flavocostata 3<br />

flavocostata 4<br />

flavocostata 5<br />

Unknown 1<br />

Unknown 2<br />

Unknown 3<br />

Unknown 4<br />

Unknown 5<br />

alternata<br />

Unknown 6<br />

pallida<br />

multimaculata<br />

Unknown 7<br />

Unknown 8<br />

balyi<br />

flohri<br />

Unknown 11<br />

Unknown 9<br />

sparsa<br />

Unknown 10<br />

Unknown 12<br />

*podontia<br />

Beetle<br />

( Blepharida )<br />

(b) Plant chemistry<br />

FLA1 … BONE<br />

FLA2 … SARU<br />

FLA3 … SUBM<br />

FLA3 … HINT<br />

FLA4 … VELU<br />

FLA5 … ASPL<br />

FLA5 … BIFL<br />

UNK1 … MORE<br />

UNK2 … INFI<br />

UNK3 … SUBM<br />

UNK4 … XOCH<br />

UNK5 … GRAN<br />

UNK6 … GLAB<br />

PALL … HETE<br />

PALL … CUNE<br />

PALL … COYU<br />

PALL … ALOE<br />

ALTE … ARBO<br />

ALTE … ATEN<br />

ALTE … CHEM<br />

ALTE … PALM<br />

ALTE … MIRA<br />

ALTE … FRAG<br />

ALTE … PENI<br />

ALTE … INST<br />

MULT … FAGP<br />

MULT … PARA<br />

MULT … TRIF<br />

MULT … DISC<br />

UNK7 … SCHL<br />

UNK8 … SUNT<br />

BALY … DIVE<br />

BALY … DISC<br />

FLOR … BIPI<br />

UNK9 … CREN<br />

UNK9 … DENT<br />

UNK9 … TRIM<br />

SPAR … KERB<br />

UN10 … APTE<br />

UN11 … SCHL<br />

UN12 … ARIE<br />

Figure 22.5<br />

(a) Phylogenies of Bursera, a genus of plants (left), and of<br />

Blepharida, a genus of beetles (right) that feed on Bursera.<br />

The beetle species are mainly monophagous and each beetle<br />

species is written next to the plant species that it feeds on. The<br />

two phylogenies are not mirror images. (b) The phylogeny of<br />

the plants (Bursera) showing the distribution of four chemical<br />

defense systems. The four are phylogenetically scattered<br />

about, rather than falling into the four branches of the plant<br />

phylogeny. (c) Phylogeny of the beetles (Blepharida) with the<br />

chemical defenses of their host plants written on the phylogeny.<br />

The chemistry of the host plants forms neat phylogenetic<br />

VELU<br />

HINT<br />

ASPL<br />

BIPI<br />

SUBM<br />

SARU<br />

XOCH<br />

GLAB<br />

BIFL<br />

DIVE<br />

MIRA<br />

HETE<br />

INFI<br />

PENI<br />

PALM<br />

ALOE<br />

COYU<br />

CUNE<br />

BONE<br />

SCHL<br />

CHEM<br />

FAGP<br />

ARIE<br />

APTE<br />

TRIF<br />

DISC<br />

PARA<br />

MORE<br />

SUNT<br />

CREN<br />

KERB<br />

DENT<br />

TRIM<br />

FRAG<br />

ARBO<br />

INST<br />

ATEN<br />

GRAN<br />

groups on the beetle phylogeny. (Multiple branches are for<br />

polyphagous beetle species a those that feed on more than one<br />

plant species.) The three phylogenies can be read together as<br />

follows. Take a group of beetles in (c), such as FLA1–5 at the<br />

left. Their host plants are chemically similar. In (a) these five<br />

beetle species are at the top, and we can see that FLA1 and<br />

FLA2, for instance, feed on phylogenetically unrelated species<br />

of plants. Perhaps FLA2 evolved after a host shift in recent<br />

times. The host shift was possible because the two host plants<br />

B. bonetti and B. sarukhanii are chemically similar (as can be<br />

seen in (b)). Modified, by permission, from Becerra (1997).<br />

© 1997 American Association for the Advancement of Science.

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