A herpetologist is tracking three species of lizards in a desert ecosystem: the horned lizard, skink, and gecko. Over one year, the horned lizard population increases by 15%, the skink population decreases by 20%, and the gecko population triples. If initially there were 200 horned lizards, 300 skinks, and 100 geckos, what is the total population after one year? - Treasure Valley Movers

A herpetologist is tracking three species of lizards in a desert ecosystem: the horned lizard, skink, and gecko. Over one year, the horned lizard population increases by 15%, the skink population decreases by 20%, and the gecko population triples. If initially there were 200 horned lizards, 300 skinks, and 100 geckos, what is the total population after one year? Gaining attention in the U.S. as desert ecosystems face shifting pressures from climate and habitat change, tracking species like these offers key insights into ecological balance, adaptation, and biodiversity trends.

Why is a herpetologist monitoring these desert lizards now? Rising environmental variability and land-use shifts are altering survival rates across species, making long-term population studies essential for conservation and scientific understanding. Whether linked to food webs, land management, or public interest in native wildlife, such data informs both science and policy.

How does the population shift unfold across these species? The horned lizard population grows by 15%—more births or improved juvenile survival—while the skink population declines by 20%, potentially due to predation or habitat stress. Meanwhile, the gecko triples in numbers, likely thriving in stable desert conditions and limited natural predators. Starting with 200 horned lizards, 300 skinks, and 100 geckos, the math reveals notable changes across the year.

Applying the changes step by step:

• Horned lizards: 200 + (15% of 200) = 200 + 30 = 230
• Skinks: 300 –