Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
- Publication
- Publication Type
Articles 1 - 6 of 6
Full-Text Articles in Entire DC Network
Use Of A Mine By Eastern Pipistrelles (Perimyotis Subflavus) In East Central Nebraska, Jason P. Damm, Keith Geluso
Use Of A Mine By Eastern Pipistrelles (Perimyotis Subflavus) In East Central Nebraska, Jason P. Damm, Keith Geluso
Western North American Naturalist
The eastern pipistrelle (Perimyotis subflavus) is relatively common and widespread throughout the eastern United States. In recent decades, the distribution of P. subflavus has expanded westward across the Great Plains, and little information exists on its natural history in this region. In east central Nebraska, we monitored the use of a mine by eastern pipistrelles for >1 year. A few males occupied the roost in summer, but during the period of hibernation (late September–early May), the mine was used by at least 30 individuals composed of both sexes. Most individuals first entered the mine during late September through …
Influence Of Pocket Gopher Mounds On Nonnative Plant Establishment In A Shrubsteppe Ecosystem, G. Page Kyle, Andrew Kulmatiski, Karen H. Beard
Influence Of Pocket Gopher Mounds On Nonnative Plant Establishment In A Shrubsteppe Ecosystem, G. Page Kyle, Andrew Kulmatiski, Karen H. Beard
Western North American Naturalist
Soil disturbances across a wide range of spatial scales have been found to promote the establishment of invasive plant species. This study addresses whether mounds built by northern pocket gophers (Thomomys talpoides) in the shrubsteppe environment of north central Washington are facilitating plant invasions into native-dominated fields. Research was conducted in native-dominated plant communities adjacent to ex-arable, nonnative-dominated fields. To determine the effect of mounds on plant growth, we recorded new establishment and persistence of all plant species over 2 growing seasons on 10–19 mound and intermound areas in 10 fields. Nonnative plant establishment was not affected by …
Arthropod And Plant Communities As Indicators Of Land Rehabilitation Effectiveness In A Semi-Arid Shrub-Steppe, Eric T. Gardner
Arthropod And Plant Communities As Indicators Of Land Rehabilitation Effectiveness In A Semi-Arid Shrub-Steppe, Eric T. Gardner
Theses and Dissertations
We describe a case study evaluating the ecological impact of Bromus tectorum L. (cheatgrass) invasion following fire disturbance and the effectiveness of revegetation in improving ecological integrity in a degraded semi-arid shrub steppe system. The effectiveness of rehabilitation efforts was assessed from measurements of arthropod richness, vegetation and arthropod community composition, and ground cover characteristics in three habitats: undisturbed, burned and weed-infested (B. tectorum), and burned and rehabilitated with native and non-native vegetation. Arthropods were collected in each habitat using pitfall traps. Differences in arthropod richness were compared using rarefaction curves. Non-metric multidimensional scaling, and non-parametric multivariate statistical procedures including …
Entropy-Based Fuzzy Set Optimisation For Reducing Ecological Model Complexity, A. M. Mouton, Bernard De Baets, A. Peter, G. Holzer, R. Müller, Peter L. M. Goethals
Entropy-Based Fuzzy Set Optimisation For Reducing Ecological Model Complexity, A. M. Mouton, Bernard De Baets, A. Peter, G. Holzer, R. Müller, Peter L. M. Goethals
International Congress on Environmental Modelling and Software
In recent years, fuzzy logic has been acknowledged as a suitable approach for species distribution modelling due to its transparency and its ability to incorporate the ecological gradient theory. Specifically, the overlapping class boundaries of a fuzzy model are similar to the transitions between different environmental conditions. However, the need for ecological expert knowledge is an important constraint when applying fuzzy species distribution models. Recent research has shown that data-driven fuzzy models may solve this ‘knowledge acquisition bottleneck’ and this paper is a further contribution. The aim was to reduce the complexity of a data-driven fuzzy habitat suitability model for …
Demography Of The Yarrow's Spiny Lizard, Sceloporus Jarrovii, From The Central Chihuahuan Desert, Héctor Gadsden, José L. Estrada-Rodríguez
Demography Of The Yarrow's Spiny Lizard, Sceloporus Jarrovii, From The Central Chihuahuan Desert, Héctor Gadsden, José L. Estrada-Rodríguez
Western North American Naturalist
The demography of a population of Yarrow's spiny lizard, Sceloporus jarrovii, was examined from 2004 to 2006 in the canyon Las Piedras Encimadas, located in Gomez Palacio, Durango, México. Lizards were studied using a mark-recapture technique. Reproduction in females occurred between November and May, coinciding with dry conditions. Reproductive activity was highest (percent of females with vitellogenic follicles or embryos) in the middle of the dry season (November and December). Thirteen percent of females reached sexual maturity at an average age of 8.5 months. The population structure was similar in spring and fall, but not in summer. A notable …
Geographic Patterns Of Ground-Dwelling Arthropods Across An Ecoregional Transition In The North American Southwest, David C. Lightfoot, Sandra L. Brantley, Craig D. Allen
Geographic Patterns Of Ground-Dwelling Arthropods Across An Ecoregional Transition In The North American Southwest, David C. Lightfoot, Sandra L. Brantley, Craig D. Allen
Western North American Naturalist
We examined the biogeographic patterns of ground-dwelling arthropod communities across a heterogeneous semiarid region of the Southern Rio Grande Rift Valley of New Mexico. Our 3 sites included portions of 5 ecoregions, with the middle site a transition area where all ecoregions converged. We addressed the following 3 questions: (1) Do the species assemblage patterns for ground arthropods across habitats and sites conform to recognized ecoregions? (2) Are arthropod assemblages in distinct vegetation-defined habitats within an ecoregion more similar to each other or to assemblages in similar vegetation-defined habitats in other ecoregions? (3) Is there a detectable edge effect with …