- Author: Kathy Keatley Garvey
Assistant professor Laura "Melissa" Guzman of the University of Southern California (USC) will discuss "Using Occupancy Models to Infer Trends of Bee Biodiversity in North America" at the April 29th seminar hosted by the UC Davis Department of Entomology and Nematology.
Her seminar begins at 4:10 p.m. in 122 Briggs Hall and also will be on Zoom. The Zoom link:
https://ucdavis.zoom.us/j/9 5882849672
"Historical museum records provide potentially useful data for identifying drivers of temporal trends in species occupancy, however, because these records were not explicitly collected for this purpose, methodological developments are needed in order to enable robust inferences," Guzman writes in her abstract. "Occupancy-detection models, a relatively new and powerful suite of methods, are potentially useful here, because these models allow us to account for changes in collection effort through space and time. Applying such occupancy-detection models to historical museum records is not a straightforward process, as these models have strict data requirements that museum data usually do not meet."
"Here I will present a methodological road-map for using occupancy models to analyze historical museum records. I use simulated data-sets to identify how and when modeling decisions and patterns in data can bias inferences. I will focus primarily on the consequences of contrasting methodological approaches for dealing with species ranges and non-detections in both space and time. Finally, I will present an application of these methods to bees in North America and will present drivers of change for these species in the past 30 years."
Guzman says that the "overarching goal of my research is to develop statistical and computational methods to leverage large biodiversity datasets to learn about ecological processes. While we know that the distribution of some species is changing, it is actually very difficult to make reliable inferences as to which species are declining and by how much from the often messy and complex historical and spatial datasets that we have to work with — for example, historical museum records, where species occurrences are aggregated from studies with different sampling procedures."
"In order to address this gap," Guzman says, "my research focuses on determining if and how statistical models can be applied to historical records without yielding biased trends. In my research I also apply these statistical models to determine how the distribution of pollinators has changed through time, where museum records provide lots of information. I am also interested in determining which drivers (e.g. pesticide use, climate change, land use change, etc.) are causing the most decline of the most pollinator species."
"Another aspect of my research is to understand the processes that shape communities, for example, I have combined experiments and modelling to understand how the structure of body size in a community affects the stability of food webs. In more recent work, I used large-scale simulations and machine learning to identify the signal of metacommunity processes in ecological time series."
Guzman is a Gabilan assistant professor in USC's Department of Biological Sciences. She received two degrees from McGlll University: her bachelor's degree (2012) in biology and her master's degree (2013) in ecology and evolution. She obtained her Ph.D. at the University of British Columbia.
She recently co-authored a piece in the journal Ecology titled "A Data Set for Pollinator Diversity and their Interactions with Plants in the Pacific Northwest," published in November 2022.
The abstract:
"Pollinator populations have declined substantially in recent years. The resulting loss in pollination services has both ecological and economic consequences, including reductions in plant diversity and crop production and lower food security. Data sets that identify pollinators and their plant hosts are of the utmost importance for the light can shed on the main causes of pollinator declines. Here we present a data set that contains 67,954 individual pollinator records. The data were collected across the Pacific Northwest, primarily focused in British Columbia (Canada), with 182 individual sites over 11 years, between 2005 and 2017. This data set comprises multiple studies that aimed to collect information on pollinator abundance, diversity, and their interactions with plants. Overall, the data set includes 937 morphospecies (of which 482 were identified to the species level) of pollinators across 105 families, including data for bees, wasps, butterflies, moths, and flies. We also present information on the interactions of these species, with 473 species of plants. The data set is being released for noncommercial use only. Credits should be given to this paper (i.e., proper citation)."
Guzman won the American Society of Naturalists Young Investigator Award, 2022-2023, and the Canadian Society of Ecology and Evolution Early Career Award, 2022-2023.
For any technical Zoom issues, contact seminar coordinator Brian Johnson at brnjohnson@ucdavis.edu. The full list of spring seminars is here.
- Author: Bob Niklewicz, MG at the Fuller Park Rose Garden
In the Master Gardener's Rose Cycle, May is when we fertilize with organic products, start deadheading and check our irritation systems. Last year we had a section of irritation tubing that was chewed through by rodents in the garden. Perhaps they were seeking water or they simply liked the taste of the tubing. They ate about a foot long section of tubing that looked like half a loaf of french bread cut long ways with the center eaten out. That is an odd graphic but close enough for your imagination. Not checking the system can waste a lot of water.
We also do some thinning out of the centers of new growth in our bushes to make sure that the air circulation is adequate. Circulation is needed to reduce black spot and rust from getting a hold in the plants. Thinning out refers to the removal or new sprouting stems that are pointed into the center of the bush or are crossing other branches. In addition, we watch for the extra, unwanted growth in the crux of two or more stems. This seems to be a nest for fungal growth and the harboring of pests in this dense new growth that will not be productive for bloom growth later.
Pruning now is simply to snap off or thumb prune those small, densely packed clusters of new leaves. That will improve circulation and send more energy to the growth you want to encourage, rather than wasting it on non-productive leaves.
Rose of the Month: Double Delight
The Double Delight rose (Rosa ‘Double Delight') bred by Swim & Ellis came to us in 1977. It is a hybrid tea rose cultivar from ‘Granada' and ‘Garden Party' parentage. It has a very sweet, fruity scent and it blooms constantly. It was awarded the title of: “World Favorite Rose” in 1985.
It is one of the best known and selling roses in the world. It is a perfect hybrid shape, that can last a long time when cut and displayed. There is no definitive reason for the name other than perhaps it has both a wonderful color and scent, or just because it has a wonderful blend of two colors. It is easy to grow but they are not immune to the mildew and blackspot. The flower is large and borne singly, though they can be in two or three buds on a long stem. The ‘Double Delight' is blooming now in the Fuller Park Rose Garden as both a tree rose and a standard bush. Come to the garden and see it in bloom for a real double delight before your eyes and nose. (Information is from The American Rose Society Encyclopedia of Roses, 2003)
Remember to toss that plant debris into your city compost bin and NOT your own compost pile. The Napa City compost center produces higher temperatures to destroy the spores while your backyard pile will not do so.
If you have questions about the Fuller Park Rose Garden and the Master Gardeners (M.G.s) who maintain that Rose Garden, the MGs are usually in the Garden the first Sunday and third Thursday of each month between 10:00 a.m. and noon, weather permitting.
Watch for information about a Summer Rose Pruning course coming May 4th at our Master Gardener classroom with a hands-on portion on May 9th at the Fuller Park Rose Garden. Visit our Master Gardner website: napamg.ucanr.edu for more details. Napa Master Gardeners are available to answer garden questions by email: mastergardeners@countyofnapa.org. or phone at 707-253-4143. Volunteers will get back to you after they research answers to your questions.
Photo credits: Bob Niklewicz