Results 51 to 60 of about 5,537,837 (195)

The logic of organizational markets: thinking through resource partitioning theory [PDF]

Resource partitioning theory claims that Increasing concentration enhances the life chances of specialist organizations. We systemati- cally think through this theory,specify implicit background assump- tions,sharpen concepts,and rigorously check the ...
Bruggeman, J., Vermeulen, I.
core  

Evolutionary morphology of the haplorhine hamate

The Anatomical Record, EarlyView.
Abstract Primates adopt a variety of hand postures during an impressive diversity of locomotor and manipulative behaviors. Morphological research has found that elements of the hand skeleton, such as the hamate, hold key information for inferring hand use and locomotor kinematics in extinct species.
Laura E. Hunter, Matthew W. Tocheri, Caley M. Orr, Biren A. Patel, Zeresenay Alemseged   +4 more
wiley   +1 more source

Abnormal cortical development after premature birth shown by altered allometric scaling of brain growth. [PDF]

, 2006
BACKGROUND: We postulated that during ontogenesis cortical surface area and cerebral volume are related by a scaling law whose exponent gives a quantitative measure of cortical development.
Ajayi-Obe, M., Nadeem Saeed, Allsop, J. M., Boardman, J., Kennea, N, Morenike Ajayi-Obe, Dyet, L., Jaroslav Stark, Frances Cowan, Saeed Nadeem, Philip Duggan, Allsop Joanna M, Counsell, S. J.; id_orcid, Kennea, N., Ajayi-Obe Morenike, Stark, J., Edwards, AD, Cowan, F, Mary A Rutherford, Joanna M Allsop, Dyet Leigh, Counsell Serena J, Counsell, SJ, Stark, J, Kennea Nigel, Duggan Philip, Maalouf, E, Allsop, JM, Kapellou, O, Jo Hajnal, Leigh Dyet, Rutherford, M. A., Rutherford, MA, Duggan, P., Edwards, A. D.; id_orcid, Ajayi-Obe, M, Maalouf Elia, A David Edwards, Maalouf, E., Boardman James, Cowan, F., Hajnal, J.; id_orcid, Saeed, N, Dyet, L, James Boardman, Cowan Frances, Edwards A. David, Duggan, P, Rutherford Mary A, Hajnal Jo, Elia Maalouf, Olga Kapellou, Kapellou, O., Serena J Counsell, Saeed, N., Hajnal, J, Stark Jaroslav, Boardman, J, Nigel Kennea, Kapellou Olga   +59 more
core   +1 more source

Bite force estimates and morphological correlations of jaw muscles in parrots

The Anatomical Record, EarlyView.
Abstract Parrots (Order: Psittaciformes) are renowned for their high bite force (BF) and morphological correlates thereof, including a highly mobile skull and two unique mandibular adductor muscles—m. pseudomasseter and m. ethmomandibularis, with the former being hypothesized to increase force output.
Ana Carolina L. Faillace, Arin Berger, Marcelo Ismar S. Santana, Adam Hartstone‐Rose   +3 more
wiley   +1 more source

Variable grouping patterns in primates: A test of the better competitor hypothesis in male Verreaux's sifaka (Propithecus verreauxi)

The Anatomical Record, EarlyView.
Abstract Intraspecific variation in social organization (IVSO) within primate populations can arise due to male mating competition. Verreaux's sifaka (Propithecus verreauxi) populations exhibit both single‐male and multi‐male groups, providing an opportunity to examine the relationship between male competitive ability and social organization.
Lemeng Li, Stacey R. Tecot, Rebecca J. Lewis   +2 more
wiley   +1 more source

Local variation in age‐related cortical expansion within and between cross‐sections of distal human long bones

The Anatomical Record, EarlyView.
Abstract Cortical bone expansion is an age‐related process where, through endosteal resorption and periosteal apposition, cross‐sectional diameter increases while cortical thickness decreases in long bone diaphyses. Local variation has been observed in this process between cross‐sectional locations, but few studies have examined directional variation ...
Gregory J. Wehrman, Alice F. Gooding, Adam D. Sylvester, Dawnie W. Steadman, Benjamin M. Auerbach   +4 more
wiley   +1 more source

Exceptional preservation informs the paleobiology of tapinocephalid dinocephalians

The Anatomical Record, EarlyView.
Abstract The tapinocephalid dinocephalian Moschops is one of the most iconic taxa of the middle Permian, yet its paleobiology remains one of the least well‐known. Here, we address some aspects of paleoneurology and paleobiology of Moschops using CT scanning of four well preserved skulls from the upper Abrahamskraal Formation of South Africa. Two of the
Julien Benoit, Lars Schmitz, Kenneth D. Angielczyk, Luke A. Norton, Andrew D. Bolton, Adam Midzuk, Roger M. H. Smith   +6 more
wiley   +1 more source

Supplementary Materials from An allometric prior enhances acoustic niche partitioning signal

, 2022
The acoustic niche hypothesis suggests that vocal signals of sympatric animal species are structured so as to minimize acoustic interference and facilitate communication.
Edvin Memet (14244332), L. Mahadevan (9918511), Brian Farrell (5030468)   +2 more
core   +1 more source

Humans and platyrrhines share a pattern of articular variance

The Anatomical Record, EarlyView.
Abstract Previous work has identified a pattern of articular shape variation in modern human limb joints, in which convex joint surfaces exhibit constrained variance relative to their more variable concave conarticulars. This pattern is notable given that joint morphogenesis is influenced by local biomechanical environments, which vary substantially ...
Haley Horbaly, Liam Zachary
wiley   +1 more source

The “costly son” hypothesis: Sons exacerbate obstetrical dilemmas in humans and other mammals

The Anatomical Record, EarlyView.
Abstract Human childbirth has often been considered uniquely difficult among mammals, yet recent evidence suggests that obstructed labor and fetopelvic disproportion are widespread across placental mammals. Here, we propose the “costly son” hypothesis: because male offspring are typically larger at birth, they impose greater obstetric risk on mothers ...
Nicole D. S. Grunstra, Jonathan C. K. Wells   +1 more
wiley   +1 more source