The Rio Grande Cottonwood (Populus deltoides wislizenii) is a keystone species of the Rio Grande Bosque ecosystem. These trees have existed in the river valley for over a million years.

They play a crucial role in maintaining ecological balance, providing food and shelter for a wide range of animals and supporting a complex network of plant life and other organisms.

Cottonwood seeds are dispersed by wind and water, carried by fine, white fibres. Successful germination requires bare soil, sufficient moisture, and full sunlight. The trees flower in spring before their leaves emerge, often coinciding with seasonal floods. Historically, these floods created open, muddy riverbanks—ideal conditions for seed germination and the establishment of young trees.

Over the past century, large-scale agriculture, irrigation, livestock grazing, and logging have altered the natural flood cycle. Soil erosion increased, wetlands were drained, and fifteen dams of varying sizes were built to control flooding. As a result, the Bosque has not experienced a natural flood since the 1940s.

Today, many Cottonwoods in the Bosque are old, while young trees are increasingly rare. Thousands are now replanted each year along the Rio Grande in an effort to prevent the species from disappearing within the next century.

I photographed these trees at San Antonio Riverine Park in San Antonio, New Mexico, and at the Rio Grande Nature Center State Park in Albuquerque.

At Riverine Park, the Cottonwoods were younger. In contrast, those in Albuquerque were mature and stood among dried grasses, fallen leaves, branches, and dead trunks—conditions that make the area highly vulnerable to fire. A single spark could trigger a serious blaze.

Parts of the Bosque were lined with jetty jacks—steel structures originally installed for river channelization and bank protection. These are now being removed, as they no longer serve their purpose and have been shown to hinder access for fire crews during emergencies.

I first encountered these trees during a visit to Albuquerque in 2006. Their presence left a lasting impression on me, and I returned specifically to photograph them.

I hope that, as you move through these images, you experience some of the same appreciation I felt while walking through these landscapes.

© 2024 Gaetano Antonini