Abstract
Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority in the Mojave Desert because of their wildlife and watershed values.We measured plant community composition, environmental variables (e.g., slope gradient, soil), and ecolog ical condition (e.g., tree recruitment) in 50, 0.1-ha woodland plots within 449,000-ha Take Mead National Recreation Area in the eastern Mojave Desert in Arizona-Nevada.We classified community types, analyzed vegetation-environment relationships, developed ecological species groups (species sharing similar distributions), and evaluated woodland condition.Cluster analysis identified 5 community types at the finest hierarchical level, which were quite distinct floristically (53% mean Sorensen similarity within communities), and included an A. gpeggii community occupying dry washes, 2 P. glandulosa communities, a mixed community, and a P. pubescens community inhabiting drainage outflows of springs.We recorded a total of 201 taxa.Mean species richness varied significantly among communities from 10 in P. pubescens to 35 species/0.1 ha in mixed communities.Environmental variables such as soil texture and cations were related to community gradients, distributions of tree species, and frequency of the tree parasite desert mistletoe ( Phoradendron californicum).We classified 73 species into 14 species groups, ranging from groups characteristic of uplands (e.g., Larrea tridentata group) to those most frequent in low lands (e.g., Allenrolfea occidentalis group).Ecological condition of the woodlands was characterized by well-distributed tree density among size classes (except for P. pubescens communities which were dominated by large trees), dominance by native species (94% of total taxa were native), mistletoe infection on 66% of plots, and infrequent evidence of perceived threats (e.g., woodcutting). RESUMENLos bosques de Acacia greggii, Prosopis glandulosa, y Prosopis pubescens tiene prioridad de conservation en el desierto de Mojave por sus valores ambientales.Se midieron la composicion de la comunidad vegetal, variables ambientales (ej., gradiente de la ladera, suelo), y condiciones ecologicas (ej., reclutamiento de arboles) en 50 parcelas, de 0.1-ha en las 449,000-ha del Lake Mead National Recreation Area en el este del desierto de Mojave entre Arizona y Nevada.Se clasificaron los tipos de comunidad tipos, se analizaron las relaciones de la vegetacion con el ambiente, se desarrollaron grupos ecologicos de especies (especies que comparten distribuciones similares), y se evaluo la condicion del bosque.El analisis cluster identified 5 tipos de comunidad en el nivel jerarquico mas fino, que fueron bastante distintos floristicamente (53% de media en el indice de similitud de Sorensen en las comunidades), e incluyo una comunidad de A. greggii que ocupa humedales secos, 2 comunidades de P. glandulosa, una comunidad mixta, y una comunidad de P. pubescens que vive en drenajes de manantiales.se registraron un total de 201 taxa.La riqueza media de especies vario significativamente entre comunidades de 10 en P pubescens a 35 especies/0.1 ha en comunidades mixtas.Las variables ambientales tales como textura del suelo y cationes estaban relacionadas con los gradientes de la comu nidad, distribuciones de especies arboreas, y frecuencia de muerdago pargasito de los arboles ( Phoradendron californicum).Se clasificaron 73 especies en 14 grupos de especies, variando desde grupos caracteristicos de las tierras altas (ej., grupo de Larrea tridentata ) a los mas frecuentes en tierras bajas (ej., grupo de Allenrolfea occidentalis).Las condiciones ecologicas de los bosques se caracterizaron por su densidad de arboles bien distribuida entre las clases de tamano (excepto las comunidades de P. pubescens que estaban dominadas por arboles grandes), dominancia de las especies nativas (94% del total de taxa fueron nativos), infeccion de muerdago en el 66% de las parcelas, y evidencia infrecuente de amenazas percibidas (ej., talas).
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Claims 10
Claim · model-written summary
Cluster analysis identified 5 woodland community types at the finest hierarchical level.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescens
Neltuma glandulosa
Senegalia greggii
Strombocarpa pubescense0 - Outcome
- community typese1
- Value
- 5 community typese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e1“Cluster analysis identified 5 community types at the finest hierarchical level”
Claim · model-written summary
Mean species richness varied significantly among communities, reaching 10 species in P. pubescens communities.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Material
- P. pubescense2
- Outcome
- mean species richnesse2
- Value
- 10e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e2“Mean species richness varied significantly among communities from 10 in P. pubescens to 35 species/0.1 ha in mixed communities”
Claim · model-written summary
Mean species richness varied significantly among communities, reaching 35 species/0.1 ha in mixed communities.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Material
- mixed communitiese2
- Outcome
- mean species richnesse2
- Value
- 35 species/0.1 hae2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e2“Mean species richness varied significantly among communities from 10 in P. pubescens to 35 species/0.1 ha in mixed communities”
Claim · model-written summary
Soil texture and cations were related to community gradients, distributions of tree species, and frequency of desert mistletoe.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Treatment
- soil texture and cationse4
- Interactor
- desert mistletoee4parasite
- Outcome
- community gradients, distributions of tree species, and frequency of the tree parasite desert mistletoee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e4“Environmental variables such as soil texture and cations were related to community gradients, distributions of tree species, and frequency of the tree parasite desert mistletoe”
Claim · model-written summary
The 73 species were classified into 14 species groups.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Outcome
- species groupse5
- Value
- 14 species groupse5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e5“We classified 73 species into 14 species groups”
Claim · model-written summary
A total of 201 taxa was recorded in the woodland plots.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Outcome
- taxae6
- Value
- 201 taxae6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e6“We recorded a total of 201 taxa”
Claim · model-written summary
Tree density was well distributed among size classes, except in P. pubescens communities dominated by large trees.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Outcome
- tree density among size classese7
- Direction
- well-distributede7
- Qualifier
- except for P. pubescens communities which were dominated by large treese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e7“well-distributed tree density among size classes (except for P. pubescens communities which were dominated by large trees)”
Claim · model-written summary
Native species dominated the woodlands, with 94% of total taxa native.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Outcome
- dominance by native speciese1
- Value
- 94%e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e1“dominance by native species (94% of total taxa were native)”
Claim · model-written summary
Mistletoe infection occurred on 66% of woodland plots.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Interactor
- mistletoee1parasite
- Outcome
- mistletoe infectione1
- Value
- 66%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e1“mistletoe infection on 66% of plots”
Claim · model-written summary
Evidence of perceived threats to the woodlands was infrequent.
- Taxon
- Acacia greggii, Prosopis glandulosa, and Prosopis pubescensNeltuma glandulosaSenegalia greggiiStrombocarpa pubescense0
- Outcome
- evidence of perceived threatse1
- Direction
- infrequente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Woodlands of Acacia greggii, Prosopis glandulosa, and Prosopis pubescens are of conservation-priority”
e1“infrequent evidence of perceived threats”