The Experts below are selected from a list of 1989 Experts worldwide ranked by ideXlab platform
Yesenia L. De León - One of the best experts on this subject based on the ideXlab platform.
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RESEARCH ARTICLE Effect of an Invasive Plant and Moonlight on Rodent Foraging Behavior in a Coastal Dune Ecosystem
2016Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Understanding how invasive plants may alter predator avoidance behaviors is important for granivorous rodents because their foraging can trigger ripple effects in trophic webs. Previous research has shown that European beach grass Ammophila arenaria, an invasive species in coastal California, affects the predation of other seeds by the rodentsMicrotus californicus, Peromyscus maniculatus, and Reithrodontomys megalotis. This may be due to lower perceived predation risk by rodents foraging in close proximity to the cover provided by Ammophila, but this mechanism has not yet been tested. We examined the perceived predation risk of rodents by measuring the ‘giving up density ’ of food left behind in experi-mental patches of food in areas with and without abundant cover from Ammophila and under varying amount of moonlight. We found strong evidence that giving up density was lower in the thick uniform vegetation on Ammophila-dominated habitat than it was in the more sparsely and diversely vegetated restored habitat. There was also evidence that moonlight affected giving up density and that it mediated the effects of habitat, although with our design we were unable to distinguish the effects of lunar illumination and moon phase. Our findings illustrate that foraging rodents, well known to be risk-averse during moonlit nights, are also affected by the presence of an invasive plant. This result has implications for granivory and perhaps plant demography in invaded and restored coastal habitats. Fu-ture research in this system should work to unravel the complex trophic links formed by a non-native invasive plant (i.e., Ammophila) providing cover favored by native rodents, which likely forage on and potentially limit the recruitment of native and non-native plants, some of which have ecosystem consequences of their own
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Invaded and restored habitat near Humboldt Bay, California USA.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Habitat invaded and dominated by European beach grass, Ammophila arenaria (top), and restored habitat with higher plant diversity and lower vegetative cover (bottom). Photographs by M. Johnson.
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ANOVA table for 2-way analysis of habitat, moonlight, and their interaction on nocturnal GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:ANOVA table for 2-way analysis of habitat, moonlight, and their interaction on nocturnal GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
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ANOVA table for mixed effects model examining effects of habitat, moonlight, and their interaction on GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:ANOVA table for mixed effects model examining effects of habitat, moonlight, and their interaction on GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
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Plant species detected (with 10% on at least one sample point) on Ammophila-dominated and restored habitats in northwestern California, June-August 2011 (n = 75 sample 1m2 sample frames in each habitat).
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Plant species detected (with 10% on at least one sample point) on Ammophila-dominated and restored habitats in northwestern California, June-August 2011 (n = 75 sample 1m2 sample frames in each habitat).
Esteban Díaz David - One of the best experts on this subject based on the ideXlab platform.
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Capacidad Germinativa de Semillas de Especies Dunares en Presencia de Glifosato
'Universitat Politecnica de Valencia', 2015Co-Authors: Esteban Díaz DavidAbstract:La Conselleria de Medio Ambiente está realizando actuaciones para erradicar el Carpobrotus edulis en zonas costeras, dunas y playas. El objetivo es conocer la respuesta germinativa en presencia de distintas dosis de glifosato de semillas de 4 especies dunares: Ammophila arenaria, Lotus creticus subsp. creticus, Ononis ramosissima subsp. ramosissima y Medicago marina.Esteban Díaz, D. (2008). Capacidad Germinativa de Semillas de Especies Dunares en Presencia de Glifosato. http://hdl.handle.net/10251/53170Archivo delegad
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Capacidad Germinativa de Semillas de Especies Dunares en Presencia de Glifosato
'Universitat Politecnica de Valencia', 2015Co-Authors: Esteban Díaz DavidAbstract:La Conselleria de Medio Ambiente está realizando actuaciones para erradicar el Carpobrotus edulis en zonas costeras, dunas y playas. El objetivo es conocer la respuesta germinativa en presencia de distintas dosis de glifosato de semillas de 4 especies dunares: Ammophila arenaria, Lotus creticus subsp. creticus, Ononis ramosissima subsp. ramosissima y Medicago marina.Esteban Díaz, D. (2008). Capacidad Germinativa de Semillas de Especies Dunares en Presencia de Glifosato. Universitat Politècnica de València. http://hdl.handle.net/10251/53170Archivo delegad
Phoebe L. Zarnetske - One of the best experts on this subject based on the ideXlab platform.
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vegetation effects on coastal foredune initiation wind tunnel experiments and field validation for three dune building plants
Geomorphology, 2021Co-Authors: Bianca R Charbonneau, Phoebe L. Zarnetske, Stephanie Dohner, John P Wnek, Don Barber, Brenda B CasperAbstract:Abstract As the land-sea interface, foredunes buffer upland habitats with plants acting as ecosystem engineers shaping topography, and thereby affecting storm response and recovery. However, many ecogeomorphic feedbacks in coastal foredune formation and recovery remain uncertain in this dynamic environment. We carried out a series of wind tunnel experiments testing how the morphology, density, and configuration of three foredune pioneer dune building plant species influence the most basic stage of dune initiation — nebkha formation around individual plants. We established monocultures of native Ammophila breviligulata and Panicum amarum and invasive Carex kobomugi in 1 m × 1 m planter boxes of sand to simulate approximate natural and managed densities and planting configurations on the US Mid-Atlantic coast. We subjected each box to constant 8.25 m/s wind for 30 min in a moveable-bed unilateral-flow wind tunnel with an unvegetated upwind sand bed. We quantified resulting topography with sub-millimeter precision and related it to plant morphology, density, and configuration. Plant morphology, density, and configuration all influenced the resulting topography. Larger plants produced larger nebkha with greater relief, height, and sand volume. However, nebkha area, height, and planform shape varied among species, and taller plants did not necessarily produce taller nebkha. The erect grasses, Ammophila and Panicum, produced more elongated, high-relief nebkha compared to the low-lying Carex, which produced lower and more symmetrical equant nebkha. A staggered planting configuration produced greater net sediment accumulation than non-staggered. We validated these results against high-resolution field topographies of foredune nebkha and found strong agreement between the datasets. Our results provide species-specific parameters useful in designing foredune plantings and beach management and can be used to parameterize vegetation in models of foredune evolution associated with different plant species. By first understanding the underlying ecogeomorphic feedbacks involved in nebkha formation, we can more effectively scale up to forecast coastal foredune evolution and recovery.
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vegetation effects on coastal foredune initiation wind tunnel experiments and field validation for three dune building plants
Geomorphology, 2021Co-Authors: Bianca R Charbonneau, Phoebe L. Zarnetske, Stephanie Dohner, John P Wnek, Don Barber, Brenda B CasperAbstract:Abstract As the land-sea interface, foredunes buffer upland habitats with plants acting as ecosystem engineers shaping topography, and thereby, affecting storm response and recovery. However, many ecogeomorphic feedbacks in coastal foredune formation and recovery remain uncertain in this dynamic environment. We carried out a series of wind tunnel experiments testing how the morphology, density, and configuration of three foredune pioneer dune builder species influence the most basic stage of dune initiation — nebkha formation around individual plants. We established monocultures of native Ammophila breviligulata and Panicum amarum and invasive Carex kobomugi in 1m x 1m planter boxes of sand to simulate approximate natural and managed densities and planting configurations on the US Mid-Atlantic coast. We subjected each box to constant 8.25 m/s wind for 30-minutes in a moveable-bed unilateral-flow wind tunnel with an unvegetated upwind sand bed. We quantified resulting topography with sub-millimeter precision and related it to plant morphology, density, and configuration. Plant morphology, density, and configuration all influenced the resulting topography. Larger plants produced larger nebkha with greater relief, height, and sand volume. However, nebkha area, height, and planform shape varied among species, and taller plants did not necessarily produce taller nebkha. The erect grasses, Ammophila and Panicum, produced more elongated, high-relief nebkha compared to the low-lying Carex, which produced lower and more symmetrical nebkha. A staggered planting configuration produced greater net sediment accumulation than non-staggered. We validated these results against high-resolution field topographies of foredune nebkha and found strong agreement between the datasets. Our results provide species-specific parameters useful in designing foredune plantings and beach management and can be used to parameterize vegetation in models of foredune evolution associated with different plant species. By first understanding the underlying ecogeomorphic feedbacks involved in nebkha formation, we can more effectively scale up to forecast coastal foredune evolution and recovery.
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Appendix C. Results from the wind tunnel experiment Tukey HSD post hoc multiple comparisons analysis of morphological characteristics of the three beach grass species, Elymus mollis, Ammophila breviligulata, and Ammophila arenaria.
2016Co-Authors: Phoebe L. Zarnetske, Sally D. Hacker, Eric W. Seabloom, Peter Ruggiero, Jason R. Killian, Timothy B. Maddux, Daniel CoxAbstract:Results from the wind tunnel experiment Tukey HSD post hoc multiple comparisons analysis of morphological characteristics of the three beach grass species, Elymus mollis, Ammophila breviligulata, and Ammophila arenaria
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Appendix A. Descriptions and photographs of morphological characteristics of beach grasses and their typical foredune shape, taken from field data across the Pacific Northwest coastal foredunes (for Elymus mollis, Ammophila breviligulata, and Ammophi
2016Co-Authors: Phoebe L. Zarnetske, Sally D. Hacker, Eric W. Seabloom, Peter Ruggiero, Jason R. Killian, Timothy B. Maddux, Daniel CoxAbstract:Descriptions and photographs of morphological characteristics of beach grasses and their typical foredune shape, taken from field data across the Pacific Northwest coastal foredunes (for Elymus mollis, Ammophila breviligulata, and Ammophila arenaria)
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Foredune cross-section schematics.
2015Co-Authors: Aaron S. David, Phoebe L. Zarnetske, Sally D. Hacker, Peter Ruggiero, Reuben G. Biel, Eric W. SeabloomAbstract:(A) Foredunes contain both spatial and temporal gradients along their cross-sections. Foredune consists of toe, crest, and heel moving from left to right. For the spatial dune gradient, quadrats were assigned values between-1 and 1 for their placement along the dune cross-section. Chronosequence age increased from the dune toe to heel (see main text for details). Shoreline and backdune are shown for orientation. (B) Historical dune consisting of only Ammophila arenaria (gray). (C) Invasion of historical dune by A. breviligulata (black) through preemptive colonization of a new dune. Ammophila arenaria retains its original population, and a backdune invasion boundary delineates the two species’ distributions along the dune. (D) Invasion of historical dune by A. breviligulata through displacement of A. arenaria. Note that there is no longer a backdune invasion boundary because the A. arenaria has been locally extirpated.
Matthew D. Johnson - One of the best experts on this subject based on the ideXlab platform.
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RESEARCH ARTICLE Effect of an Invasive Plant and Moonlight on Rodent Foraging Behavior in a Coastal Dune Ecosystem
2016Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Understanding how invasive plants may alter predator avoidance behaviors is important for granivorous rodents because their foraging can trigger ripple effects in trophic webs. Previous research has shown that European beach grass Ammophila arenaria, an invasive species in coastal California, affects the predation of other seeds by the rodentsMicrotus californicus, Peromyscus maniculatus, and Reithrodontomys megalotis. This may be due to lower perceived predation risk by rodents foraging in close proximity to the cover provided by Ammophila, but this mechanism has not yet been tested. We examined the perceived predation risk of rodents by measuring the ‘giving up density ’ of food left behind in experi-mental patches of food in areas with and without abundant cover from Ammophila and under varying amount of moonlight. We found strong evidence that giving up density was lower in the thick uniform vegetation on Ammophila-dominated habitat than it was in the more sparsely and diversely vegetated restored habitat. There was also evidence that moonlight affected giving up density and that it mediated the effects of habitat, although with our design we were unable to distinguish the effects of lunar illumination and moon phase. Our findings illustrate that foraging rodents, well known to be risk-averse during moonlit nights, are also affected by the presence of an invasive plant. This result has implications for granivory and perhaps plant demography in invaded and restored coastal habitats. Fu-ture research in this system should work to unravel the complex trophic links formed by a non-native invasive plant (i.e., Ammophila) providing cover favored by native rodents, which likely forage on and potentially limit the recruitment of native and non-native plants, some of which have ecosystem consequences of their own
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Invaded and restored habitat near Humboldt Bay, California USA.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Habitat invaded and dominated by European beach grass, Ammophila arenaria (top), and restored habitat with higher plant diversity and lower vegetative cover (bottom). Photographs by M. Johnson.
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ANOVA table for 2-way analysis of habitat, moonlight, and their interaction on nocturnal GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:ANOVA table for 2-way analysis of habitat, moonlight, and their interaction on nocturnal GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
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ANOVA table for mixed effects model examining effects of habitat, moonlight, and their interaction on GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:ANOVA table for mixed effects model examining effects of habitat, moonlight, and their interaction on GUD in Ammophila-dominated and restored habitats in northwestern California, June-August 2011.
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Plant species detected (with 10% on at least one sample point) on Ammophila-dominated and restored habitats in northwestern California, June-August 2011 (n = 75 sample 1m2 sample frames in each habitat).
2015Co-Authors: Matthew D. Johnson, Yesenia L. De LeónAbstract:Plant species detected (with 10% on at least one sample point) on Ammophila-dominated and restored habitats in northwestern California, June-August 2011 (n = 75 sample 1m2 sample frames in each habitat).
Faith C Belanger - One of the best experts on this subject based on the ideXlab platform.
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identification of the fungal endophyte of Ammophila breviligulata american beachgrass as epichloe amarillans
PeerJ, 2018Co-Authors: Ian Drake, James F White, Faith C BelangerAbstract:: The grass Ammophila breviligulata (American beachgrass) is known to host an endophyte of the genus Epichloe. Based on morphological characteristics it was originally identified as Acremonium typhinum var. Ammophilae and is currently designated as Epichloe typhina var. Ammophilae. However, the Epichloe species has not previously been identified based on DNA sequence data. Based on phylogenetic placement of beta-tubulin and translation elongation factor 1-alpha DNA sequences the endophyte is identified as a member of E. amarillans rather than E. typhina.
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Identification of the fungal endophyte of Ammophila breviligulata (American beachgrass) as Epichloë amarillans
PeerJ Inc., 2018Co-Authors: Ian Drake, James F White, Faith C BelangerAbstract:The grass Ammophila breviligulata (American beachgrass) is known to host an endophyte of the genus Epichloë. Based on morphological characteristics it was originally identified as Acremonium typhinum var. Ammophilae and is currently designated as Epichloë typhina var. Ammophilae. However, the Epichloë species has not previously been identified based on DNA sequence data. Based on phylogenetic placement of beta-tubulin and translation elongation factor 1-alpha DNA sequences the endophyte is identified as a member of E. amarillans rather than E. typhina