30-7 Bias in Basins: Preservational Megabias in a Simulated World

Session: Laws of the Grave: Advances in Taphonomy Across the Paleontologic Record (Posters)

Poster Booth No.: 201

Presenting Author:

Alexandra Apgar

Authors:

Apgar, Alexandra Davis¹, Qiao, Huijie², Saupe, Erin E. ³, Peterson, A. Townsend⁴, Soberón, Jorge L. ⁵, Moore, Jason Richard⁶, Myers, Corinne⁷, Scuderi, Louis A.⁸

(1) Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA, (2) Institute of Zoology, Chinese Academy of Sciences, Beijing, China, (3) Department of Earth Sciences, University of Oxford, Oxford, Oxfordshire, United Kingdom, (4) Kansas University Biodiversity Institute and Natural History Museum, Lawrence, Kansas, USA, (5) Department of Ecology & Evolutionary Biology, Kansas University, Lawrence, Kansas, USA, (6) University of New Mexico, Honors College, Albuquerque, NM, USA, (7) Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA, (8) Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA,

Abstract:

Our interpretation of the terrestrial fossil record is impacted by several major megabiases, including how only terrestrial organisms that live, disperse, or deposit within an actively filling, net-depositional sedimentary basin may potentially preserve. It is imperative, therefore, that we gain an understanding of how greatly this bias can impact our ability to accurately represent species traits, phylogenetic relationships, and overall ecosystem structures. Multiple studies have utilized a virtual world model simulating global conditions (including fluctuating precipitation and temperature patterns) across the past 120,000 years in order to delineate macroevolutionary patterns of marine organisms over time. Virtual species within this model were seeded into grid cells and allowed to expand their geographic range based on assigned values relating to dispersal ability and niche breadth. Here, we examine the impact and extent of the basin-only preservational megabias on phylogenetic relationships and overall species diversity within terrestrial species in simulated North and South America. The position of all sedimentary basins active within the past 120,000 years were added post-hoc to simulation results, with 12 10,000-year time slices designated for the elimination of all species seeds not within a basin. Overall species diversity and phylogenetic relationships of simulated species were examined within each time bin and compared to their ‘real’ record, with further examination done to determine if any relationship existed between these ‘preserved’ species and additional traits (niche breadth, dispersal ability, basin size, etc.). These processes were then implemented post-hoc into simulation results again, this time with basin positions randomized. Preliminary results demonstrate that while the basin-only preservational megabias does affect simulated paleoecological interpretations, this impact is minimal beyond overall record reduction.

Geological Society of America Abstracts with Programs. Vol. 57, No. 6, 2025

doi: 10.1130/abs/2025AM-11037

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