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The weight of fossil leporids and ochotonids: body mass estimation models for the order L agomorpha
Author(s) -
MoncunillSolé B.,
Quintana J.,
Jordana X.,
Engelbrektsson P.,
Köhler M.
Publication year - 2015
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/jzo.12209
Subject(s) - fossorial , biology , allometry , extant taxon , bivariate analysis , tree allometry , ecology , body weight , fossil record , estimation , zoology , statistics , evolutionary biology , mathematics , management , economics , biomass (ecology) , biomass partitioning , endocrinology
L agomorphs are widespread around the world, but little is known about the biology and ecology of their fossil ancestors. In this case, knowing the body mass of these extinct species is of principal interest because it is correlated with physiological, morphological and life history attributes. Moreover, insular fossil rabbits, hares and pikas, which became spectacular giants with huge weights and dramatic shifts in their life histories, encourage curiosity in the research world. Our principal aim is to create allometric models between skeletal parameters and body weights with extant species of the order L agomorpha (both ochotonids and leporids). These regressions can then be applied to the fossil register to estimate the body mass of the extinct lagomorphs. The models are satisfactory in all cases, although weaker relationships were obtained when we analyzed dental parameters. Multiple models have slightly better results than bivariate ones, but their use is limited to complete bones or skeletons. These body mass estimation models were tested in three different fossil lagomorphs: P rolagus apricenicus , P rolagus cf. calpensis and N uralagus rex . In all three cases, the results from dental variables were discarded due to the fact that these species may not follow the allometric relationship between teeth and body mass of standard lagomorphs. Other variables, such as the proximal anteroposterior diameter of the humerus in N . rex , were also removed for their implications in fossorial lifestyle. We ultimately estimated a weight of around 600 g for P . apricenicus , 300 g for P . cf. calpensis and 8000 g for N . rex . Differences in extrinsic mortality explain the important differences in body masses between the two P rolagus species. The results of N . rex cannot be compared with the giant P rolagus due to phylogenetic differences.