Zoos and Wildlife

Exploring the diversity of wildlife in Australia and the world in full colours.

The Cambrian Explosion

The Cambrian era, spanning from approximately 541 million to 485 million years ago, is renowned for the remarkable explosion of biodiversity that laid the foundation for the complex and diverse ecosystems seen in the subsequent geological periods. This pivotal period in Earth’s history is often called the Cambrian Explosion, during which a profound increase in the diversity of multicellular life occurred.

Before the Cambrian Explosion, life on Earth primarily consisted of simple, single-celled organisms. Transitioning to more complex, multicellular lifeforms during the Cambrian era marked a pivotal moment in evolutionary history. The seas, the primary habitat during this time, became teeming with many organisms exhibiting diverse body plans, structures, and ecological roles.

One of the key drivers of the Cambrian Explosion was the evolution of hard mineralized skeletons, providing organisms with structural support and protection. The development of these skeletons, such as the mineralized shells of molluscs and the exoskeletons of arthropods, allowed for the emergence of larger and more complex body forms. This innovation opened up new ecological niches and set the stage for the proliferation of diverse marine life.

The Cambrian Explosion witnessed the emergence of various phyla, representing a broad spectrum of body plans and anatomical features. Arthropods, molluscs, chordates, and other major animal groups originated during this period, showcasing life’s rapid evolution and diversification. The competition for resources and ecological niches spurred an evolutionary arms race, driving the development of various adaptations and defence mechanisms among the evolving organisms.

The factors contributing to the explosion of biodiversity during the Cambrian era are complex and multifaceted. Changes in environmental conditions, the evolution of predation, and the development of biological innovations all played critical roles. The Cambrian Explosion stands as a pivotal chapter in the history of life on Earth, laying the groundwork for the intricate and diverse ecosystems that continue to shape the planet’s biodiversity today.

Below are some views captured with a Nikon D750, the equally excellent Nikkor 180mm f2.8, and the Tokina 100mm f2.8.

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