Evolutionary Phenomics: How Intrinsic and Extrinsic Factors Shape Life on Earth

Overview

The talk explores why life looks the way it does by examining how intrinsic traits of organisms interact with extrinsic environmental factors to steer evolution over deep time. The presenter introduces evolutionary phenomics as a quantitative approach to describing organism form and uses vivid examples to illustrate fundamental ideas about constraints, convergence, and the fossil record. The discussion spans from simple sketches of cats and dogs to large scale patterns across the tree of life, and highlights how modern imaging and AI are accelerating the study of morphology and evolution.

Key insights

• Evolution is shaped by both intrinsic factors (ecology, development, physiology, brain size) and extrinsic factors (environment and species interactions).
• Trait linkages and developmental constraints funnel evolutionary possibilities into a restricted space, increasing the likelihood of convergent forms across distant lineages.
• Cats and dogs illustrate how development can limit or expand morphological variation, with profound consequences for evolution and domestication.
• 3D phenomics and automated imaging enable high resolution, evolutionary analyses across thousands of species, including vast insect collections, fossil data, and deep time climate correlations.

Introduction to Evolutionary Phenomics

The talk begins with a core question in evolutionary biology: what intrinsic and extrinsic factors shape the tempo and mode of evolution in organismal form? The speaker emphasizes that patterns of biodiversity are not uniform across time or space, with tropical regions hosting far more species than polar regions and with rapid bursts of diversification and mass extinctions in Earth’s history. The framework proposed is evolutionary phenomics, a high dimensional, organism wide study of phenotype that leverages fossil data to reveal how form evolves in response to ecological and developmental forces.

Intrinsic and Extrinsic Factors

The intrinsic factors include genome evolution, development, life history, biomechanics, physiology, and brain size. Extrinsic factors cover environment, species interactions, and climate change. Importantly, the past matters because lineages carry legacy constraints that influence how present-day species can evolve.

The Morphology of Constraints

A central idea is that trait relationships create a constrained space in which evolution can move. This is illustrated with simulations showing a tube of viable phenotypes rather than an ever expanding space. When trait correlations are imposed, many potential forms never arise, and convergence becomes more common because the same constraints funnel different lineages toward similar solutions.

Phenomics in Practice

The speaker discusses the development of methods to quantify whole organism morphology. Early approaches relied on a handful of linear measurements, which failed to capture the richness of skull shapes across vertebrates. A semi landmark method is introduced, where a generic 3D template is warped to fit skull shapes and then used to compare structures and their interactions. The talk emphasizes automation and AI to accelerate data collection and analysis, enabling large scale studies across thousands of species and even fossil data.

Case Studies and Deep Time

Two main examples are highlighted. In mammals, skull evolution shows convergent patterns, with certain parts of the skull evolving more slowly due to strong trait covariances, while other regions evolve more rapidly. Birds, as a highly diverse group of dinosaurs, evolve skulls more slowly overall because many of their hard head structures are relatively simple. Dinosaurs and birds are used to illustrate how development and ecology shape evolution, and how climate records can be integrated into evolutionary models to understand past and future responses to climate change.

From Fossils to Foraminifera

A milestone example shows a PhD student applying automated pipelines to CT scans of fossil shells from ocean sediments to trace speciation events over the onset of glaciation. This demonstrates how new imaging and analysis workflows can reveal evolutionary processes in deep time that were previously inaccessible.

Insects and the Next Frontier

The speaker argues that insects, comprising most of Earth's species, have historically been hard to study in a morphometric sense due to sheer diversity. By scanning large insect collections and applying automated workflows, researchers hope to uncover fundamental patterns explaining why there are so many insect species and how their forms evolved across the tree of life.

Connecting Past and Present Global Change

Turning to current biodiversity crises, the talk links climate change, habitat loss, and other threats to extinction risk. It emphasizes the rate and pace of change as critical drivers of evolutionary responses and cautions that past and present changes must be understood together to predict future outcomes accurately. The Paleocene-Eocene Thermal Maximum is highlighted as an extreme example of rapid climate change, illustrating how current trajectories may unfold in the coming centuries if action is not taken.

Conservation Implications

The discussion ends with a warning about mass extinction risk and the societal consequences of biodiversity loss. The interconnectedness of life means that declines in species can feed back to impact human well-being through ecosystem services. The speaker underscores the urgency of rapid, informed action to align evolutionary trajectories with a sustainable future.