G2E10 - Rod Page

Importance of biodiversity in understanding ecological health.
Various methods used to assess species diversity:
- Species richness (the number of different species in a given area).
- Species evenness (the relative abundance of species).
- Shannon and Simpson diversity indices.

Current Understanding of Species Diversity:
- 8.7 million species estimated on Earth, with a margin of error of ± 1.3 million.
- Breakdown: 6.5 million species on land and 2.2 million in oceans.
- This estimate announced by the Census of Marine Life, based on comprehensive analysis.

As of 2021, approximately 1.7 million species described and cataloged by scientists.
Estimated totals vary widely, with some scientists suggesting the existence of 5 to 10 million or more species.
Many species remain undiscovered or undescribed:
- Taxonomists actively discovering new species; the total number is expected to rise.
Continuous research and advancements in taxonomy and biodiversity are crucial.

Rate of Discovery:
- Historical graph shows the discovery rate of species like birds since Linnaeus (1758).
- Different patterns observed in the discovery rates across various taxa (e.g., birds, arthropods).

Breakdown of estimated eukaryotic species:
- Eukaryotes: about 8.7 million species globally.
- Notably, 86% of species on Earth and 91% in ocean still await formal description.
Taxonomic classifications can help estimate species totals in various groups.

Knowledge of microbial diversity is limited; it’s suggested we’ve sampled only a tiny fraction of microbial life.
Bacterial and archaeal species estimates range wildly but are generally considered to be in the millions.

Initiatives like iNaturalist allow citizens to contribute to biodiversity knowledge by documenting species.
Technology and social contributions from citizen scientists are vital in discovering and monitoring biodiversity.

There are biases in our understanding of species diversity, often resulting from uneven data collection:
- Certain regions and taxonomic groups are more studied than others.
- Closing knowledge gaps through continuous exploration is essential as varied species may be on the brink of extinction.

Study Notes on Species Diversity and Global Distribution

Importance of Biodiversity: Understanding ecological health relies heavily on assessing species diversity, which encompasses both species richness (number of different species) and species evenness (relative abundance of species).
Current Understanding:
- Approximately 8.7 million species are estimated on Earth, with a margin of error of ± 1.3 million.
- Breakdown: An estimated 6.5 million species on land and 2.2 million in oceans as per the Census of Marine Life.
- As of 2021, about 1.7 million species have been described and cataloged, with total species estimates varying significantly, suggesting 5 to 10 million or more exist.

Data Collection Disparities: There are significant biases in biodiversity data collection, with certain regions and taxonomic groups being studied more thoroughly than others.
Knowledge Gaps: Many species, especially in less studied regions or among specific taxa, remain undiscovered, leading to gaps in our understanding of overall biodiversity.

Citizen Science Initiatives: Programs like iNaturalist engage the public in documenting and reporting species, playing a crucial role in biodiversity knowledge expansion.
Impact: Technology and social contributions help in discovering and monitoring biodiversity, making a significant difference in data collection and species documentation.

Microbial Diversity: The extent of microbial life is still largely unknown, with estimates suggesting that we have only sampled a tiny fraction of it. Bacterial and archaeal species are presumed to be in the millions.
Eukaryotic Diversity: About 86% of Earth's species and 91% of ocean species are estimated to await formal description.
Advances in Measurement: New techniques like DNA barcoding are being utilized to aid in the identification and classification of numerous undiscovered species, enhancing research in biodiversity measurement and taxonomy.