Biology ETDs

Publication Date

Summer 7-15-2024

Abstract

Piñon- juniper (PJ) woodlands in the Southwest United States are expected to see mortality and structural change in response to climate change. The extent to which this habitat structures itself as well as its response to these changes over time are not well known yet and have not been examined to this extent for the location of this study within the Sevilleta National Wildlife Refuge. Within a small range, we discovered these woodlands consist of persistent woodland, shrubby woodland, and juniper savanna in which structural, spatial, and regeneration patterns differ. In this study, we discovered the specific differences between these habitats through spatial analysis of stand structure, species composition, and establishment as well as looking at change through a period of almost 20 years. Between each habitat type, clear differences regarding shrub and tree composition, seedling and adult tree density, and understory biomass were observed. Varied patterns of establishment IV between each habitat type occurred as well, such that each habitat type of persistent woodland, shrubby woodland, and juniper savanna had observable differences between them. In addition to this, the dynamics of these habitats through time displayed how each habitat type responded to change and the different rates at which these changes occurred. This study enhances our understanding of variation within the habitats of a piñon- juniper woodland providing insight into the differences of structure and establishment as well as how these habitats exhibit change differently through time.

Language

English

Keywords

pinus edulis, juniperus monosperma, spatial dynamics, restructuring, establishment, habitat composition

Document Type

Thesis

Degree Name

Biology

Level of Degree

Masters

Department Name

UNM Biology Department

First Committee Member (Chair)

Scott Collins

Second Committee Member

Esteban Muldavin

Third Committee Member

William Pockman

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