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Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona-Galindo, Taylor Waters, David Chirikian
Insect Visitation Of Peduncular And Petiolar Extrafloral Nectar Glands On Castor Bean (Ricinus Communis L.) Plants In Southern California, Victor D. Carmona-Galindo, Taylor Waters, David Chirikian
Biology Faculty Works
Castor bean (Ricinus communis L.) is a myrmecophytic plant species with specialized extrafloral nectar (EFN) glands that serve to attract predatory insects, which in return defend plant-tissues against herbivores. The EFN glands on castor bean plants are located along the leaf petioles as well as on the peduncles of its imperfect (unisexual) flowers. This field-project evaluates the richness, diversity, and species assemblage of insects visiting EFN glands located on (female and male) flower peduncles and leaf petioles on castor bean plants growing in a Southern California coastal landscape. We detected that EFN glands on female-flower peduncles were visited by …
Exploration Of Climate Influences On The Abundance Of Galls On Red Willow (Salix /Aevigata) Across Two Riparian Communities In Southern California, Victor D. Carmona-Galindo, Rachael Sears, Tauras P. Vilgalys, Emily Hand, Sara Morledge-Hampton
Exploration Of Climate Influences On The Abundance Of Galls On Red Willow (Salix /Aevigata) Across Two Riparian Communities In Southern California, Victor D. Carmona-Galindo, Rachael Sears, Tauras P. Vilgalys, Emily Hand, Sara Morledge-Hampton
Biology Faculty Works
In Southern California, the red willow (Sa/ix laevigata Bebb) hosts a variety of gall-inducing parasitic insects. However, little is known about the ecology of these parasites, particularly the characterization of their microclimate preferences. This study explores the relationship between microclimate and gall frequencies in S. laevigata in the Ballona Wetlands and Temescal Canyon, and gall count correlated with biotic and abiotic factors such as soil pH, soil moisture and willow density. Significantly more galls per leaf were found at Temescal Canyon than Ballona Wetlands. Although the number of galls per leaf correlated negatively with soil pH, soil moisture content and …
Differential Resource Allocation Of Black Mustard Plants (Brassica Nigra L.) With Proximity To Black Walnut Trees (Jug/Ans Californica L.) In A Southern California Riparian Ecosystem, Victor D. Carmona-Galindo, Matt Cronrod, Kellyanne Gold
Differential Resource Allocation Of Black Mustard Plants (Brassica Nigra L.) With Proximity To Black Walnut Trees (Jug/Ans Californica L.) In A Southern California Riparian Ecosystem, Victor D. Carmona-Galindo, Matt Cronrod, Kellyanne Gold
Biology Faculty Works
The invasive forb Brassica nigra (black mustard) and the native tree Jug/ans californica (black walnut) are allelopathic species that suppress the growth of neighboring plants. This study evaluates how allocation to root, reproductive, and photosynthetic biomass in B. nigra was affected with proximity to J. califomica. We hypothesized that a joint suppressive effect would lead to lower root biomass allocation in B. nigra near J. californica due to reduced interspecific competition. Our results indicate that B. nigra plants growing near J. califomica had significantly lower root : total biomass ratios, and provide insights into how to effectively control this invasive …
Cranial Morphometrics Of The Dire Wolf, Canis Dirus, At Rancho La Brea: Temporal Variability And Its Links To Nutrient Stress And Climate, F. Robin O'Keefe, Wendy J. Binder, Stephen R. Frost, Rudyard W. Sadlier, Blaire Van Valkenburgh
Cranial Morphometrics Of The Dire Wolf, Canis Dirus, At Rancho La Brea: Temporal Variability And Its Links To Nutrient Stress And Climate, F. Robin O'Keefe, Wendy J. Binder, Stephen R. Frost, Rudyard W. Sadlier, Blaire Van Valkenburgh
Biology Faculty Works
The tar pits of Rancho La Brea are a unique window onto the biology and ecology of the terminal Pleistocene in southern California. In this study we capitalize on recent advances in understanding of La Brea tar pit chronology to perform the first morphometric study of crania of the dire wolf, Canis dirus, over time. We first present new data on tooth fracture and wear from pits dated older than heretofore analyzed, and demonstrate that fracture and wear events, and the increased competition and heightened carcass utilization they are thought to represent, were of varying intensity across the sampled …
Characterization Of Sugar Diversity In Floral And Extra-Floral Nectar From The Coastal Coral Tree (Erythrina Caffra Thunb.) In Southern California, Victor D. Carmona-Galindo, Kenny Morales, Renee Maser, Julius Doyle, Mera Gobrial
Characterization Of Sugar Diversity In Floral And Extra-Floral Nectar From The Coastal Coral Tree (Erythrina Caffra Thunb.) In Southern California, Victor D. Carmona-Galindo, Kenny Morales, Renee Maser, Julius Doyle, Mera Gobrial
Biology Faculty Works
The Coastal Coral Tree (Erythrina caffra Thunb.) produces floral nectar (FN) that serves to attract pollinating insects, but also secretes nectar from extra-floral (EFN) glands that serves to at-tract predatory insects, such as ants. While stu-dies on myrmecophytes (i.e. specialized plants that attract and interact with ants) have primarily focused on interspecific evaluations of EFN chemistry, the Coastal Coral tree offers an op-portunity to contrast intraspecific nectar chemi-stry with differing evolutionary and ecological functions. We hypothesized that the richness of (molecular) sugar species, relative concentra-tions, and diversity of sugars in FN and foliar EFN would diverge due to differences in …
Sub-Canopy Temperature Dynamics Of A Native Tree Plantation From A Lowland Tropical Rainforest In Costa Rica, Victor D. Carmona-Galindo, Traci-Lynn Hirai, Stacie Samuelson, Cherie Hale, Elizabeth Braker
Sub-Canopy Temperature Dynamics Of A Native Tree Plantation From A Lowland Tropical Rainforest In Costa Rica, Victor D. Carmona-Galindo, Traci-Lynn Hirai, Stacie Samuelson, Cherie Hale, Elizabeth Braker
Biology Faculty Works
With urbanization encroaching upon forestlands, characterizing microclimates in secondary forests will be important for the sustainable management of microclimates in agroforestry systems. We used micro-sensors to characterize changes in temperature at different heights in the sub-canopy of both secondary forest and 15-year-old agroforestry plots. Results show that while agroforestry plots had different temperature profiles from the secondary forest, the monoculture plot (consisting of Pentaclethra macroloba) had temperatures similar to the profile found in the secondary forest. This suggests that the replication of temperature profiles in a secondary forest may be independent of the number of tree species in a plot …
Drosophila Hematopoiesis: Markers And Methods For Molecular Genetic Analysis, Cory Evans
Drosophila Hematopoiesis: Markers And Methods For Molecular Genetic Analysis, Cory Evans
Biology Faculty Works
Analyses of the Drosophila hematopoietic system are becoming more and more prevalent as developmental and functional parallels with vertebrate blood cells become more evident. Investigative work on the fly blood system has, out of necessity, led to the identification of new molecular markers for blood cell types and lineages and to the refinement of useful molecular genetic tools and analytical methods. This review briefly describes the Drosophila hematopoietic system at different developmental stages, summarizes the major useful cell markers and tools for each stage, and provides basic protocols for practical analysis of circulating blood cells and of the lymph gland, …
Stage-Dependent Plasticity Of The Anterior Neural Folds To Form Neural Crest, Maxellende Ezin
Stage-Dependent Plasticity Of The Anterior Neural Folds To Form Neural Crest, Maxellende Ezin
Biology Faculty Works
The anterior neural fold (ANF) is the only region of the neural tube that does not produce neural crest cells. Instead, ANF cells contribute to the olfactory and lens placodes, as well as to the forebrain and epidermis. Here, we test the ability of the ANF to form neural crest by performing heterotopic transplantation experiments in the chick embryo. We find that, at the neurula stage (HH stage 7), the chick ANF retains the ability to form migrating neural crest cells when transplanted caudally to rostral hindbrain levels. This ability is gradually lost, such that by HH9, this tissue appears …
Pvr Expression Regulators In Equilibrium Signal Control And Maintenance Of Drosophila Blood Progenitors, Cory Evans
Pvr Expression Regulators In Equilibrium Signal Control And Maintenance Of Drosophila Blood Progenitors, Cory Evans
Biology Faculty Works
Blood progenitors within the lymph gland, a larval organ that supports hematopoiesis in Drosophila melanogaster, are maintained by integrating signals emanating from niche-like cells and those from differentiating blood cells. We term the signal from differentiating cells the ‘equilibrium signal’ in order to distinguish it from the ‘niche signal’. Earlier we showed that equilibrium signaling utilizes Pvr (the Drosophila PDGF/VEGF receptor), STAT92E, and adenosine deaminase-related growth factor A (ADGF-A) (Mondal et al., 2011). Little is known about how this signal initiates during hematopoietic development. To identify new genes involved in lymph gland blood progenitor maintenance, particularly those involved in equilibrium …