Millennials were the largest generation group in the United States in 2024, with an estimated population of ***** million. Born between 1981 and 1996, Millennials recently surpassed Baby Boomers as the biggest group, and they will continue to be a major part of the population for many years. The rise of Generation Alpha Generation Alpha is the most recent to have been named, and many group members will not be able to remember a time before smartphones and social media. As of 2024, the oldest Generation Alpha members were still only aging into adolescents. However, the group already makes up around ***** percent of the U.S. population, and they are said to be the most racially and ethnically diverse of all the generation groups. Boomers vs. Millennials The number of Baby Boomers, whose generation was defined by the boom in births following the Second World War, has fallen by around ***** million since 2010. However, they remain the second-largest generation group, and aging Boomers are contributing to steady increases in the median age of the population. Meanwhile, the Millennial generation continues to grow, and one reason for this is the increasing number of young immigrants arriving in the United States.

The statistic shows the number of people in the U.S. in 2011 and 2030, by generation. By 2030, the Millennial generation will have 78 million people whereas the Boomer generation will only have 56 million people in the United States.

Variation in life histories influences demographic processes, from adaptive changes to population declines leading to extinction. Among life history traits, generation length offers a critical feature to forecast species’ demographic trajectories such as population declines (widely used by the IUCN Red List) and adaptability to environmental change over time. Therefore, estimates of generation length are crucial to monitor demographic stability or predict future changes in highly threatened organisms, particularly amphibians and reptiles, which are particularly threatened among vertebrates and for which uncertainty in future impacts remains high. Despite its importance, generation length for amphibians and reptiles is largely missing. Here, we aim to fill-in this gap by modeling generation lengths for amphibians, squamates and testudines as a function of species size, climate, life history, and phylogeny using generalized additive models and phylogenetic generalized least squares. We es..., , , # Generation length of the world's amphibians and reptiles

https://doi.org/10.5061/dryad.w0vt4b93t

Description of the data and file structure

Files and variables

File: amphibian_full_data.csv

Description:Â

Variables

• scientificName: (character) species binomial
• generation_length_y: (numeric) average generation length in years
• source_GL: (character) source of generation length
• generation_length_y.pgls: (numeric) average generation length in years predicted by PGLS
• generation_length_y.gam: (numeric) average generation length in years predicted by GAM
• Body_mass_g: (numeric) species body mass in grams, NAs represent missing data
• source_bodymass: (character) source of body mass, NAs represent missing data
• SVL_mm: (numeric) species snout-vent length in mm, NAs represent missing data
• source_SVL: (character) source of SVL, NAs represent missing data
• bio01: (numeric) annual temperature in °C
• bio04: (n...,

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