Physical Sciences and Mathematics Commons^™

Regional Expansion And Evaluation Of Potential Chemical Control For Invasive Apple Snails (Pomacea Maculata) In Southwest Louisiana, Julian M. Lucero

LSU Master's Theses

The integration of monitoring and chemical control is an efficient strategy for managing invasive apple snails, Pomacea maculata, in the rice (Oryza sativa L.) and crawfish systems of southwest Louisiana. However, their current distribution, expansion rates, and susceptibility to chemical control methods in this area are not well known. This study evaluated the expansion of P. maculata in southwest Louisiana and assessed potential chemical control for P. maculata among toxicity assays using various application rates. The effects of potential chemical control were also assessed on a non-target species, the red swamp crawfish (Procambarus clarkii). P. maculata …

Moving On Up: Vertical Distribution Shifts In Rocky Reef Fish Species During Climate-Driven Decline In Dissolved Oxygen From 1995 To 2009, Erin L. Meyer-Gutbrod, Li Kui, Mary Nishimoto, Linda Snook, Milton Love

Faculty Publications

Anthropogenic climate change has resulted in warming temperatures and reduced oxygen concentrations in the global oceans. Much remains unknown on the impacts of reduced oxygen concentrations on the biology and distribution of marine fishes. In the Southern California Channel Islands, visual fish surveys were conducted frequently in a manned submersible at three rocky reefs between 1995 and 2009. This area is characterized by a steep bathymetric gradient, with the surveyed sites Anacapa Passage, Footprint and Piggy Bank corresponding to depths near 50, 150 and 300 m. Poisson models were developed for each fish species observed consistently in this network of …

Distribution Of Crude Fat For A Halophyte (Suaeda Glauca) Growing In The Songnen Grassland, H. X. Sun, Ch. L. Liu, Ch. Sh. L.

IGC Proceedings (1997-2023)

No abstract provided.

Distribution And Frequency Of Aquatic Oomycetes Throughout Marin County In Relation To Physical Chemical Water Parameters, Franki Crites

Natural Sciences and Mathematics | Biological Sciences Master's Theses

Oomycetes, also known as water molds, belong to the kingdom Stramenopila and are a well-known group of plant pathogens and saprophytes. Important species include Phytophthora ramorum (causal agent of sudden oak death), Pythium aphanidermatum (root rot), and Phytophthora infestans (late potato blight), all major threats to the environment, agriculture, and the economy. Although many oomycete species have been found in various water sources, little is known about the correlation between the distribution and frequency of oomycetes in aquatic environments and physical chemical water parameters. The objective of this study was to detect and identify aquatic oomycetes from Marin County using …

Elevated Atmospheric Co2 Concentration Triggers Redistribution Of Nitrogen To Promote Tillering In Rice, Juan Zhou, Yingbo Gao, Junpeng Wang, Chang Liu, Zi Wang, Minjia Lv, Xiaoxiang Zhang, Yong Zhou, Guichun Dong, Yulong Wang, Jianye Huang, Dafeng Hui, Zefeng Yang, Youli Yao

Biology Faculty Research

Elevated atmospheric CO₂ concentration (eCO₂) often reduces nitrogen (N) content in rice plants and stimulates tillering. However, there is a general consensus that reduced N would constrain rice tillering. To resolve this contradiction, we investigated N distribution and transcriptomic changes in different rice plant organs after subjecting them to eCO₂ and different N application rates. Our results showed that eCO₂ significantly promoted rice tillers (by 0.6, 1.1, 1.7, and 2.1 tillers/plant at 0, 75, 150, and 225 kg N ha⁻¹ N application rates, respectively) and more tillers were produced under higher N application rates, …

Joint Spacing In The Caples Lake Granodiorite Of The Sierra Nevada Batholith In Eldorado National Forest, California: A Comparative Analysis Of Joint Sets And Data Resolution, Jimmy Wood

Theses/Capstones/Creative Projects

Joints are the most common deformation structure in the Earth’s upper crust and exert a significant influence on structural stability, landscape morphology, and fluid flow . Therefore, a greater understanding of fracture parameters (e.g., length, aperture, etc.) allows us to more accurately predict their presence, persistence, and prevalence, in the subsurface . We study the fracture spacing of two sub-orthogonal joint sets—66 NE-246 SW and 330 NW-150 SE—in the Caples Lake granodiorite of the Sierra Nevada Batholith, California. Specifically, we investigate 1) their spacing distributions with a keen interest in power-law (fractal) spacing, 2) distribution comparisons between master and cross …

An Investigation On Some Ecological Characteristics Of Ziziphus Spina Chirsti (L.) In Southern Iran, A. R. Mahmoodi, Mansour Mesdaghi, Masoume Amirkhani, E. Kargari

IGC Proceedings (1997-2023)

No abstract provided.

Distribution And Occurrence Of Uranium In Coal And Its Migration Behavior During The Coal Utilization, Wang Wenfeng, Wang Wenlong, Liu Shuangshuang, Bai Hongyang, Wang Yulong, Duan Piaopiao, Qin Kemin, Chen Yilin

Coal Geology & Exploration

Coal and uranium resources are closely related in spatial disposition as well as mineralization, and the reasonable development, utilization and pollution control of them play an essential role in the sustainable development of our national economy and society. Based on a large number of literature research and the previous results of our research group, some conclusions were drawn with regard to the distribution and occurrence of uranium in coal `and its migration in the process of coal preparation, combustion and leaching:(1) The enrichment and mineralization of uranium in coal has reflected the evolution of coal-forming tectonics:The U-rich coal in Southwest …

Soricidenfunde (Mammalia: Insectivora) In Der Mongolei, Michael Stubbe, Davaa Lchagvasuren, Hermann Ansorge, Ravčigijn Samjaa, Dietrich Dolch, Nayamsuren Batsajchan, Margit Hanelt, Annegret Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

New data on the Mongolian fauna of Soricidae came in the last decades from Russian scientists, such as Ju. G. Švecov, N. I. Litvinov, and B. I. Sheftel, last not least, in cooperation with Mongolian mammalogists. We remind the reader about the publications of N. Chotochu, D. Bazardorž, and R. Samjaa with his team. Also in future, there is a lot to do for understanding the biology, ecology, and distribution of the Mongolian shrews. We have summarized the most important publications on shrews and made a grid mapping together with the results of the Mongolian-German Biological Expeditions. Up to now, …

Beitrag Zur Säugetierfauna Der Ostmongolei, Davaa Lchagvasuren, Annegret Stubbe, Michael Stubbe, Hermann Ansorge, Dietrich Dolch

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Between 2008 and 2014, four Mongolian-German Biological Expeditions worked for short periods in East Mongolia. The results related to mammalian fauna were summarized. Investigation areas were parts of the Daurian steppe, Buir-nuur- and Nömrög-gol-region. Chiroptera were recorded with four species. Especially, Vespertilio sinensis has to be considered as a characteristic species of the eastern steppes. Aggregations of some thousand individuals were found in the Buir-nuur-region. The other three species were Plecotus ognevi, Myotis petax, and Myotis aurascens. It is to expect, that in eastern Mongolia some more Chiroptera-species will re-covered in future.

The degree of investigation of …

Der Kormoran Phalacrocorax Carbo In Der Mongolei, Michael Stubbe, Lucie Marie Baltz, Davaa Lchagvasuren, Lukas Kratzsch, Lara-Sophie Dey, Annegret Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

The Great Cormorant Phalacrocorax carbo is a wide spread breeding species in Mongolia with a progressive population trend. Observations of the Mongolian-German Biological Expeditions were analyzed and summarized with data from literature. About 1,500 young birds were ringed in 2016 and 2017. One important recovery was coming from the wintering area Mai Po Marshes Nature Reserve of Hong Kong. It is unclear if all Mongolian Cormorants are flying at the same route to their wintering region in South China. The main feeding fishes in Mongolia belong to endemic species of the genus Oreoleuciscus (Cyprinidae). Measurements of 113 eggs from Tolbo- …

From The Steppe To The Desert: Survey Of Band-Winged Grasshoppers From Mongolia (Orthoptera: Acrididae: Oedipodinae) Based On Material From 50 Years Of Expeditions, Lara-Sophie Dey, Matthias Seidel, Davaa Lchagvasuren, Martin Husemann

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

The steppe regions of Mongolia have a rich grasshopper fauna. Especially, the short-horned (Caelifera) grasshopper family Acrididae with the subfamilies Gomphocerinae (slant-faced grasshoppers) and Oedipodinae (band-winged grasshoppers) show a high diversity and abundance. This study reviews the Mongolian fauna of band-winged grasshoppers based on collection data of 50 years of expeditions of the German-Mongolian research cooperation. These collection data (assembled between 1962 and 2019) were used to generate a faunistic overview of Oedipodinae species for the region. In total 740 specimens belonging to 16 species were reported. Based on the collected material, study of the types and the original species …