Here is a breakdown of the estimated population sizes for different sifaka species:
1. Verreaux's sifaka (Propithecus verreauxi): Estimated population size of 10,000 to 100,000 individuals.
2. Diademed sifaka (Propithecus diadema): Estimated population size of 1,000 to 10,000 individuals.
3. Golden-crowned sifaka (Propithecus tattersalli): Estimated population size of 1,000 to 10,000 individuals.
4. Silky sifaka (Propithecus candidus): Estimated population size of 200 to 1,000 individuals (critically endangered).
5. Coquerel's sifaka (Propithecus coquereli): Estimated population size of 10,000 to 100,000 individuals.
6. Indri sifaka (Propithecus indri): Estimated population size of 1,000 to 10,000 individuals.
7. White-footed sifaka (Propithecus deckenii): Estimated population size of 200 to 1,000 individuals (critically endangered).
It's important to note that these population estimates are based on available data and may change as new information becomes available. Additionally, various conservation efforts are underway to protect sifakas and their habitats, which may influence their population trends over time.