# Assessing Climate Impact: Distribution Modeling and Conservation Assessments of Sesamum (Pedaliaceae) Species

## TL;DR

This study uses climate modeling to predict how climate change will affect the habitats of Sesamum plants, finding that most species are likely to lose suitable habitats and need conservation action.

## Contribution

The study applies MaxEnt modeling to assess climate-driven range shifts in Sesamum species, identifying key environmental variables and prioritizing vulnerable species for conservation.

## Key findings

- 74% of Sesamum species are projected to experience range contractions by 2080, with S. schinzianum facing the most significant decline.
- Precipitation and temperature variables were the primary drivers of distribution changes, with species-specific responses to soil factors.
- Phylogenetic analyses showed random distribution of niche breadth and extinction risk, highlighting the need for targeted conservation of vulnerable species like S. forbesii and S. sesamoides.

## Abstract

Plants with restricted distributions and small population sizes are particularly vulnerable to climate change. Sesamum species are ideal for species distribution modeling due to their ecological sensitivity, agricultural and economic importance, and wide geographic range, providing insights for conservation and policy. We applied the maximum entropy (MaxEnt) model to assess the global ecological niche breadth of Sesamum species and examine how bioclimatic and soil variables influence their future (2080) distribution. We identified key environmental drivers and projected species‐specific range shifts under changing climatic conditions. MaxEnt models effectively predicted suitable habitats, with climate variables playing a dominant role. Precipitation of the wettest month (BIO13) was particularly influential for
S. abbreviatum, S. alatum
, and
S. angustifolium
, while temperature variables (BIO7, BIO11) were also key. Elevation moderately impacted
S. angolense
, while soil factors such as pH (
S. abbreviatum
) and clay content (
S. angolense
) exhibited species‐specific effects. Principal component analysis revealed variation in niche breadth, with
S. indicum
and S. schinzianum occupying broader ecological ranges, whereas
S. saxicola
and
S. abbreviatum
were more restricted. Future projections suggest 46.4% of the species will experience range contractions, with S. schinzianum facing the most significant decline. Conversely, 39.3% of the species, including S. imperatricis and
S. abbreviatum
, are expected to expand their ranges. Phylogenetic analyses indicate a random distribution of niche breadth and extinction risk across the genus. Our findings highlight the susceptibility of Sesamum species to climate change, emphasizing the need for urgent conservation actions. Prioritizing vulnerable species such as
S. forbesii
and S. sesamoides, alongside habitat restoration and long‐term monitoring, is crucial to mitigate population declines and prevent extinction.

Sesamum species, known for their sensitivity to environmental conditions and narrow distribution ranges, were modeled using MaxEnt to predict how climate change will impact their future habitats. The study found that 74% of the species are expected to experience reduced niche breadths and range contractions by 2080, while a few species may expand their ranges. Precipitation and temperature were key drivers of distribution, emphasizing the need for targeted conservation efforts for vulnerable species like
S. forbesii
and S. sesamoides.