Schroer_and_Wood_2015_Evolution_character_displacement_fossil_hominins_v1

PREFERRED CITATION: Schroer K and Wood B. 2015. The role of character displacement in the molarization of hominin mandibular premolars. Evolution. DOI: 10.1111/evo.12672. Title: Schroer_and_Wood_2015_Evolution_character_displacement_fossil_hominins_v1 Version number: 1 Date (ISO) original data publication: 5/5/15 Dates (ISO) data collection: 01/01/12-01/01/14 Date (ISO) online publication: 5/5/15 Companion manuscript title: "The role of character displacement in the molarization of hominin mandibular premolars" Companion manuscript journal: Evolution Primary collector of data: Kes Schroer Co-authors: Bernard Wood Research assistants: Kristen Ramirez, Christine Foltz Short description: Measurements of the lower fourth premolar (P4) from fossil hominins for character displacement analysis. Rows: 64 (header = TRUE) Columns: 15 Empty cell label: NA Variables: I, T, L, Intrx, Taxon, logmd, logbl, logarea, Randomly.selected?, ACC, Specific.taxon, P4MD, P4BL, P4AREA, P4AREACALC ==================== I, T, L, and Intrx: variables of the input matrix. “I” is Intercept and is always 1. “T” is “Taxon” and is encoded “1” for one taxon and “-1” for the other. “L” is location and is “1” for the sympatrix taxa and “-1” for the allopatric taxa. “Intrx” is the interaction of T and L and simply multiples these two values. Taxon: placement of each specimen in one of four categories: EA.Homo, EA.Paranthropus, O.Homo, or S.Paranthropus. Categories are mutually exclusive. “EA” stands for East Africa, “O” stands for other, and the “S” in S.Paranthropus stands for South Africa. logmd, logbl, and logarea: the natural logs of the measurements P4MD, P4BL, and P4AREACALC. Randomly.selected: whether or not a specimen was randomly selected by the custom R script for character displacement analysis (see manuscript for more details). “Yes” indicates that the specimen was selected and “NA” indicates that the specimen was not. ACC: specimen number assigned by the host museum Specific.taxon: genus and species name P4MD: mesiodistal diameter of the lower fourth premolar, in millimeters P4BL: buccolingual diameter of the lower fourth premolar, in millimeters P4AREA: area of the occlusal surface of the lower fourth premolar, calculated through a resampled outline in the digitization program tpsDIG (see manuscript for more details). Some fossil specimens were not available for this measure, in which case P4AREA is filled with “NA.” P4AREACALC. For fossil specimens without a P4AREA measurement, P4MD and P4BL are multiplied to give an estimate of P4AREA. P4AREA and P4AREACALC are the same for specimens available for measurements in tpsDIG.

推荐引用格式：Schroer K与Wood B. 2015年发表于《进化（Evolution）》期刊的论文"The role of character displacement in the molarization of hominin mandibular premolars"，DOI: 10.1111/evo.12672。
数据集标题：Schroer_and_Wood_2015_Evolution_character_displacement_fossil_hominins_v1
版本号：1
原始数据发布日期（ISO格式）：2015年5月5日
数据收集日期（ISO格式）：2012年1月1日—2014年1月1日
在线发布日期（ISO格式）：2015年5月5日
配套手稿标题："The role of character displacement in the molarization of hominin mandibular premolars"
配套手稿期刊：《进化（Evolution）》
数据主要收集者：Kes Schroer
共同作者：Bernard Wood
研究助理：Kristen Ramirez、Christine Foltz
简短描述：本数据集包含用于性状替换（character displacement）分析的人科（hominin）化石下颌第四前臼齿（P4）测量数据。
行数：64（含表头，header = TRUE）
列数：15
空值标记：NA
变量列表：I、T、L、Intrx、Taxon、logmd、logbl、logarea、Randomly.selected?、ACC、Specific.taxon、P4MD、P4BL、P4AREA、P4AREACALC

变量说明：
I、T、L与Intrx：为输入矩阵的变量。"I"为截距项，取值恒为1；"T"代表"类群（Taxon）"，其中一类编码为1，另一类编码为-1；"L"代表"分布位置"，同域类群取值为1，异域类群取值为-1；"Intrx"为T与L的交互项，即二者数值的乘积。
Taxon：每个标本的分类归属，共4个互斥类别：EA.Homo、EA.Paranthropus、O.Homo、S.Paranthropus。其中"EA"代表东非，"O"代表其他区域，"S"代表南非。
logmd、logbl与logarea：分别为P4MD、P4BL与P4AREACALC测量值的自然对数。
Randomly.selected?：标注标本是否通过定制R脚本随机选取用于性状替换分析（详细信息见手稿），"Yes"表示已被选取，"NA"表示未被选取。
ACC：馆藏博物馆赋予的标本编号。
Specific.taxon：属种学名。
P4MD：下颌第四前臼齿的近中远中径，单位为毫米。
P4BL：下颌第四前臼齿的颊舌径，单位为毫米。
P4AREA：下颌第四前臼齿咬合面面积，通过数字化软件tpsDIG中的重采样轮廓计算得到（详细信息见手稿）。部分化石标本未获取该测量值，此时P4AREA记为NA。
P4AREACALC：对于未获取P4AREA测量值的化石标本，通过P4MD与P4BL的乘积估算其咬合面面积。对于可通过tpsDIG获取测量值的标本，P4AREA与P4AREACALC数值一致。