Amboseli Elephant Lower Jaw Collection

Thu, 2010-10-07 13:54 by pili · Forum/category:

The AERP field team routinely collects the lower jaws of deceased elephants for determining age at mortality from the degree of emergence of the six molars on each side of the jaw. Only in Amboseli can the age at death for known individuals for nearly the whole population be determined.

Every time and AERP researcher finds a dead elephant she attempts to identify the individual. The lower jaw is collected and catalogued in order to measure and age it using a standard technique developed by Richard Laws in 1966 (Laws, R.M. 1966. Age criteria for the African elephant. East African Wildlife Journal 4: 1-37). The techniques for aging elephants are based on assigning an age category (the 'Laws category') to the tooth or teeth visible in the mandible. The accuracy of age categories has been assessed against elephants whose molar growth was observed over time resulting in some minor revisions at ages <20 years (Jachmann, H. 1988. Estimating age in African elephants: a revision of Laws’ molar evaluation technique. African Journal of Ecology 26: 51-56). The age at death for known Amboseli individuals (those with a positive ID) is presented here, and the accuracy of the age estimates is given (0 = unknown; 1 = ± 5 years; 2 = ± 2.5 years; 3 = ± 1 year 4 = ± 6 mo; 5 = known to month).

These data may be of interest for people who want to assess the accuracy of their ageing in relation to poached elephants. We have found that the Laws age technique is accurate until very old ages (Lee, Sayialel, Lindsay & Moss, in preparation, Ageing elephants from teeth: validation from known individuals. MS, 2010).

ID Tag / photo no Laws Category Laws Age Jachman Revision Age at Death Sex Age Accuracy
RACHEL -1 XV 24 22 19 F 2
RUTH -1 XV-XVI 25 25 24 F 2
SUS -1 XVI+ 27 27 29 F 3
ALYCE -1 XVIII 30 30 29 F 2
TIA -1 XIX 32 32 34 F 2
TANIA -1 XXII 39 39 40 F 1
333 1 VII 6 5 4.67 M 5
HAO 2 VI 4 4 4 M 5
TAM 3 XI 15 13 12 F 3
TAM3 4 I 0 0 0 u 5
RE3 5 II-III 0.8 0.5 1.25 M 5
TAN3 6 III 1 1 1.25 F 5
KILI 7 III 1 1 . U 0
TER 8 XXIX-XXX 60 60 62 F 1
153 9 XVII 28 28 28 M 3
15 10 XV-XVI 25 25 20 M 3
185 11 XI-XII 16 14 16 M 3
SA female 12 XVII-XVIII 29 29 F 2
336 13 IX 10 8 10 M 5
ZOE 14 XVI-XVII 27 27 30 F 3
252 15 XI-XII 16 14 14 M 5
350 16 VII 6 5 5.9 M 5
144 17 XVII-XVIII 29 29 29 M 3
PRI 19 XXI-XXII 38 38 41 F 2
GAR 20 VII 6 5 8.75 F 5
UNK 21 X-XI 14 12 . U 0
BIG 22 XXVI-XXV 51 51 53 F 1
304 23 IX 10 8 9.4 M 5
CAL 24 XV-XVI 25 25 22 F 3
HAR 25 XXVI-XXV 51 51 49 F 2
143 26 XVI 26 26 24 M 3
OPH 27 XVI 26 26 20 F 3
JES 28 XIX 32 32 38 F 2
UNK 29 XI 15 13 . M 0
ALI3 30 VII 6 5 5 M 5
ORIEL 31 XIV 22 20 20 F 3
UNK 32 XIV-XV 23 21 . f 0
UNK 33 XVIII 30 30 . M 0
EMI 34 XXI-XXII 38 38 41 F 2
145 35 XVI-XVII 27 27 37 M 2
178 36 XIX 32 32 28 M 3
KILI 37 XX-XXI 35 35 . M 0
UNK 38 XXVI 49 49 . M 0
ZAM 39 XVIII 30 30 33 F 3
57 40 XXII-XXIII 41 41 42 M 3
137 41 XXI-XXII 38 38 37 M 3
239 42 XVII 28 28 27 M 3
JEZ 43 XXVII-XXVIII 54 54 58 F 2
45 44 XXIV-XXV 46 46 48 M 2
UNK 45 XXV-XXVI 48 48 . U 0
DINAH 46 XXII-XXIII 41 41 41 F 3
KAT 47 XIX 32 32 32 F 3
UNK 48 XXI 36 36 . M 0
119 49 XXVI 49 49 47 M 2
KILI 50 X 13 10 . F 0
Unk 51 XI-XII 16 14 M 0
UNK 52 XIX 32 32 . M 0
KILI 53 XVII-XVIII 29 29 . f 0
285 54 XVII 28 28 23 M 4
UNK 55 XXII 39 39 . F 0
10 56 XXV-XXVI 48 48 51 M 2
FAI 57 XII 18 15 17 F 5
UNK 58 XVII-XVIII 29 29 . M 0
UNK 60 XIX 32 32 . M 0
195 61 XIX 32 32 31 M 3
279 62 XVI 26 26 24 M 4
UNK 63 VIII 8 6 . M 0
150 64 XXIV 45 45 45 M 2
TUS 66 XXI-XXII 38 38 35 F 3
SAN? 67 XXIV 45 45 54 F 2
201 68 XXII 39 39 36 M 3
FEN4 70 IV-V 2.5 2.5 2.6 F 5
UNK 71 XVII 28 28 . M 0
WAR 72 XXVIII-XXIX 56 56 57 F 2
UNK 73 XVI 26 26 . U 0
UNK 74 XV 24 22 . M 0
STA 75 XVIII 30 30 32 F 3
135 76 XXII-XXIII 41 41 40 M 2
97 78 XXVI 49 49 45 M 2
AMA 79 XXII 39 39 45 F 2
125 80 XXIV-XXV 46 46 44 M 2
UNK 81 XXIV 45 45 . F 0
KAR 82 XXIII 43 43 50 F 1
160 83 XXII 39 39 37 M 3
166 84 XXI 36 36 35 M 3
FLO 85 XXII 39 39 39 F 3
79 86 XIX-XX 33 33 45 M 2
184 87 XXII 39 39 38 M 3
UNK 88 X 13 10 . F 0
UNK 89 XXI 36 36 . F 0
UNK 90 XXIV 45 45 . F 0
UNK 91 I 0 0 . U 0
342 92 XIII-XIV 21 19 16 M 5
SARA? 93 XXII-XXIII 41 41 40 F 1
579 94 VII 6 5 5.8 M 5
GLO 95 XXIX 57 57 56 F 1
UNK 96 VII 6 5 . U 0
KLEO 97 XXIII 43 43 49 F 2
UNK 98 XV 24 22 . M 0
UNK 99 XV 24 22 . M 0
51 100 XXIII 43 43 55 M 1
UNK 101 V 3 3 . F 0
179 102 XXII 39 39 38 M 3
HOR 103 XXIX 57 57 68 F 1
XET 104 XXI-XXII 38 38 35 F 3
205 105 XX-XXI 35 35 32 M 3
KILI 106 XXI-XXII 38 38 . F 0
UNK 107 XXV 47 47 . F 0
357 108 XII 18 15 16 M 5
340 109 XVI 26 26 22 M 5
UNK 110 XVII 28 28 . M 0
592 111 VIII 8 6 7 M 5
UNK 112 XIV 22 20 . m 0
ERIN 113 XXI-XXII 38 38 34 F 3
CELESTE 114 XXII+ 40 40 44 F 3
ESME 115 XXV-XXVI 48 48 56 F 1
AMY 116 XXVI 49 49 46 F 2
129 117 XXV 47 47 45 M 2
OLALLA 118 XIV-XV 23 21 16 F 5
EST 119 XXIX-XXX 60 60 68 F 1
UNK 120 XV 24 22 . M 0
VID? 121 XXIX 57 57 65 F 1
156 122 XXVI 49 49 46 M 2
211 123 XXIII-XXIV 44 44 45 M 3
CALF 123.1 III 1 1 . U 0
UNK-KILI 124 XXV 47 47 . F 0
115 124.1 XXV 47 47 43 M 3
CALF 125 VI 4 4 U 0
Wanjuhi 126 XVI-XVII 25 25 27 F 5
YOUNG MALE
unk
127 XII 18 15 M 0
YM RH 127 XII 18 15 . M 0
316 128 XVII-XIX 31 31 29.5 M 5
Geraldine 129 XXVII 53 53 59 F 1
YOUNG UNK 130 IX 10 8 U 0
Brenna 131 XXIII-XXIV 44 44 41 F 2
Grace 132 XXIX-XXX 60 60 59 1
ISIS 133 XXX 60 60 73 1
PAGUTA 134 IX-X 12 10 8 F 5
LETICIA 135 XXVIII 55 55 69 1
UNK 136 XXII-XXIII 38 38 M?
YM RH 137 XIV-XV 23 23 M 0
UNK 138 XIX 32 32
UNK 139 IX 10 8
UNK M 140 XXI 36 36
OA M04 141 VII 6 5 5 M 5
UNK m 142 XXI-XXII 38 38
INFANT 143 III 1 1
VA M 144 X 13 11 15 3
UNK 145 VI 4 4
M363 146 XVII 28 28 27 M 5
UNK 147 XI-XII 16 14 M?
UNK 148 VIII 8 6
UNK 149 VII 6 5
ym 150 X 13 10 m
UNK 151 X 13 10
ULLA 153 XXVII-XXVIII 54 54 66 F 2
UNK 154 V 3 3
UNKF 155 XXIV 45 45
UNK M 156 XXV 47 47
UNK 157 XVI 26 26
ODETTE 158 XXVI 49 49 47 F 3
UNK 159 XVI 26 26
BEA 160 XVI 26 26 30 F 5
UNK 162 VIII 8 6
ULVA 163 XVII-XVIII 29 29 27 F 5
M97 164 XXVI 49 49 44 3
UNK 2RH 164 XXVI 49 49 . ?M 0
CELINA 165 XV 24 25 21 F 5
CALF 166 VIII-IX 9 7
BESS 167 XXII-XXIII 38 38 38 3
UNK 168 XIV 22 20 M
UNK 169 XI (XVII) 15 13 M?
Periwinkle
07M
170 IV 2 2 2 m
M516 171 XX-XXI 35 35 30 5
UNK 172 XVII 28 28 M?
PILAR 173 XVIII 30 30 41 3
M183 174 XXVI 49 49 48 3
PLEE 175 XVII 28 28 26 5
UNK M 176 XV 24 22
PHOEBE 177 XXVII-XXVIII 54 54 71 1
TERYL 178 XI 15 13 14 F 5
UNK F 179 X-XI 14 12
UNK m 180 XV 24 22
INGA 181 XXVI 49 49 46 F 3
EMERALD 182 XXII 39 39 34 F 5
CALF 183 III 1 1
M392 184 XVII 28 28 24 M 5
UNK F 185 XII-XIII 19 17
LEDA 186 XVI 26 26 24
UNK F 187 XXII-XXIII 38 38 41
ULONA 188 XIX 32 32 29 5
CALF 189 VI 4 4
MISSING
TAG
191 XV-XVI 25 25
UNK 637 IV 2 2 . U 0
UNK 638 IX 10 8 . u 0
UNK 642 XXVII 53 53 . u 0
UNK 644 XXIV 45 45 . F 0
UNK 645 IV 2 2 . u 0
UNK 648 XIII 20 20 . u 0
UNK 649 XXII-XXIII 40 40 . M 0
UNK 650 XXII 39 39 . u 0
UNK 651 XIII 20 18 . u 0
UNK 652 XVI 26 26 . u 0
UNK 653 VI 4 4 . u 0
UNK 654 X 13 10 . M 0
UNK 655 XIX 32 32 . U 0
UNK 658 V-VI 3.5 3.5 . u 0
UNK . IV-V 2.5 2.5 . U 0
UNK . V 3 3 . U 0
UNK . V-VI 3.5 3.5 . U 0
UNK . VI 4 4 . U 0
UNK . VII 6 5 . U 0
UNK . VII 6 5 . U 0
UNK . VIII 8 6 . U 0
UNK . X 13 10 . U 0
UNK . XI 15 13 . U 0
UNK . XI-XII 16 14 . U 0
UNK . XII 18 15 . U 0
UNK . XII 18 15 . M 0
UNK . XIII 20 18 . U 0
UNK . XIII 20 18 . U 0
UNK . XIII 20 18 . U 0
UNK . XIII-XIV 21 19 . M 0
UNK . XIV 22 20 . U 0
UNK . XIV-XV 23 21 . U 0
UNK . XIV-XV 23 21 . U 0
UNK . XV+ 25 24 . m 0
UNK . XVI 26 26 . U 0
UNK . XVI 26 26 . M 0
UNK . XVI 26 26 . M 0
UNK . XVI 26 26 . f 0
UNK . XVI 26 26 . U 0
UNK . XVI-XVII 27 27 . M 0
UNK . XVI-XVII 27 27 . M 0
UNK . XVI-XVII 27 27 . M 0
UNK . XVI-XVII 27 27 . U 0
UNK . XVII 28 28 . U 0
UNK . XVII 28 28 . M 0
UNK . XVII 28 28 . U 0
UNK . XVIII 30 30 . M 0
UNK . XIX 32 32 . f 0
UNK . XIX 32 32 . f 0
UNK . XIX 32 32 . U 0
UNK . XIX 32 32 . U 0
UNK . XIX 32 32 . U 0
UNK . XIX 32 32 . U 0
UNK . XIX 32 32 . U 0
UNK . XX 33 34 . M 0
UNK . XX 34 34 . M 0
UNK . XXI 36 36 . U 0
UNK . XXII- 37 37 . F 0
UNK . XXI-XXII 38 38 . M 0
UNK . XXII 39 39 . U 0
UNK . XXII 39 39 . F 0
UNK . XXII 39 39 . M 0
UNK . XXII 39 39 . f 0
UNK . XXII-XXIII 41 41 . M 0
UNK . XXIV 45 45 . F 0
UNK . XXIV 45 45 . M 0
UNK . XXIV-XXV 46 46 . U 0
UNK . XXV 47 47 . M 0
UNK . XXV 47 47 . m 0
UNK . XXV 47 47 . F 0
UNK . XXVI-XXVII 51 51 . F 0
UNK . XXIX 57 57 . M 0