ฮอร์โมนเอกไดสเตียรอยด์ในวงจรการลอกคราบของปูขาว
Scylla Paramamosain Estampador, 1949,
2025
คณะวิทยาศาสตร์
ฮอร์โมนเอกไดสเตียรอยด์ในวงจรการลอกคราบของปูขาว Scylla Paramamosain Estampador, 1949, พีรเดช ใจมั่น
Chulalongkorn University Theses and Dissertations (Chula ETD)
ฮอร์โมนกลุ่มเอกไดสเตียรอยด์ (ecdysteroids) เป็นฮอร์โมนสเตียรอยด์ที่มีบทบาทสำคัญในการควบคุมกระบวนการลอกคราบ การเจริญเติบโต และการพัฒนาในสัตว์ขาปล้อง โดยเฉพาะในกลุ่มครัสเตเชียน การศึกษานี้มีวัตถุประสงค์เพื่อวิเคราะห์ชนิดฮอร์โมนและระดับฮอร์โมนกลุ่ม ecdysteroids ในวงจรการลอกคราบของปูขาว (Scylla paramamosain) โดยเลี้ยงปูในระบบน้ำหมุนเวียนเป็นเวลา 2 เดือน ครอบคลุมวงจรลอกคราบอย่างน้อย 1 รอบ และเก็บตัวอย่างเลือดทุก 2 วัน ปริมาณ 100 µL เพื่อตรวจวัดฮอร์โมน Ecdysone (E), 20-hydroxyecdysone (20-HE) และ Ponasterone A (PoA) ด้วยเทคนิค High Performance Liquid Chromatography (HPLC) ผลการวิเคราะห์พบว่า ฮอร์โมน PoA มีความเข้มข้นสูงในระยะ premolt (445.18 ± 54.64 ng/mL, n=11) มากกว่าระยะ intermolt อย่างมีนัยสำคัญทางสถิติ (78.46 ± 9.9 ng/mL, n=11; p
‘Who’S Your Daddy?’: Ddradseq Parentage In Broodstock-Offspring Pairs Of Diadema Antillarum In A Population Restoration Initiative,
2025
University of Central Florida
‘Who’S Your Daddy?’: Ddradseq Parentage In Broodstock-Offspring Pairs Of Diadema Antillarum In A Population Restoration Initiative, Bianca R. Rosendahl
Undergraduate Scholarship and Creative Works
In the early 1980s Diadema antillarum, or the long-spined urchin, was hit by a catastrophic mass mortality event across the western Atlantic and Gulf of Mexico, inclusive of the Florida Keys. The cause of this die-off event was likely triggered by a pathogen or environmental stressor that decimated native populations by up to 98%. The species has not yet fully recovered and is struggling with recruitment success which is why it may benefit from an ex-situ recovery program. In this study, I used single nucleotide polymorphisms (SNPs) to identify genetic variation and analyze parentage in a captive population of …
Using Post-Supercritical Co2-Assisted Method To Deposit Niep Alloy Coating On The Micro-Arc Oxidation Layer Of Az31 Magnesium Alloy And Its Corrosion Behavior Analysis,
2025
Department of Mechanical Engineering, Lunghwa University of Science and Technology, Guishan, Taoyuan 335, Taiwan
Using Post-Supercritical Co2-Assisted Method To Deposit Niep Alloy Coating On The Micro-Arc Oxidation Layer Of Az31 Magnesium Alloy And Its Corrosion Behavior Analysis, Kang-Yu Liao, Hung-Hua Sheu, Ming-Yuan Lin, Ming-Chih Kuo, Po-Hsun Wu, Hung-Bin Lee
Journal of Marine Science and Technology–Taiwan
In this study, a Ni-P alloy coating was deposited on the micro arc oxidation (MAO) layer of AZ31 magnesium alloy to improve its corrosion resistance. The MAO layers were prepared under different operated voltages from 300 to 400 V. The results indicated that the optimize operated parameters for MAO layer is at 350 V, the MAO coatings had the most compact microstructure and superior corrosion resistance. In order to improve the corrosion resistance of MAO coating, this study chose to deposit Ni-P alloy coating on the surface of MAO coating via the post supercritical CO2-assisted electroless plating (PSC-CO …
The Effect Of Feedback On A Remote Operator’S Maneuvering Control For Mass Remote Navigation Competency,
2025
Graduate school of Mokpo National Maritime University, Mokpo, 58628, Republic of Korea
The Effect Of Feedback On A Remote Operator’S Maneuvering Control For Mass Remote Navigation Competency, Hyoseon Hwang, Ik-Hyun Youn
Journal of Marine Science and Technology–Taiwan
The rapid advancement of Maritime Autonomous Surface Ships (MASS) technology has highlighted the growing need for Remote Operators (ROs) to manage MASS effectively. ROs possess specialized competencies in areas such as situational awareness, crisis management, and system operation. Despite the introduction of competency-based training and assessment in the maritime sector through the international convention on standards of training, certification, and watchkeeping for seafarers convention, the framework's implementation remains incomplete, particularly in remote operator training for MASS. This study is purpose to identify which competencies improve rapidly with performance feedback and which improve slowly. This study conducted an experiment to quantitatively …
Evaluation Of Carbon Sequestration In Seagrass Meadows Of Kenting: A Comparative Study With Penghu And Dongsha Island,
2025
Institute of Earth Sciences, National Taiwan Ocean University, Keelung, Taiwan
Evaluation Of Carbon Sequestration In Seagrass Meadows Of Kenting: A Comparative Study With Penghu And Dongsha Island, Zih-Wei Tang, Huei-Fen Chen, Jordi Mahardika Puntu, Ping-Yu Chang, Li Lo, Jian-Jhih Chen, Wen-Chen Chou, Lan-Feng Fan, Ying-Ju Chang
Journal of Marine Science and Technology–Taiwan
This study investigates the controlling factors of carbon sequestration (CS) in seagrass bed sediments across three distinct environments in Taiwan: the Kenting (KT) coastal area, the Penghu (PH) open inner bay, and the Dongsha (DS) Atoll lagoon. Actual measurements of the substrate depth beneath the sediment and ground-penetrating radar (GPR) scans of the beach reveal that the coral reef bedrock in KT slopes landward. A field survey of the seagrass area in KT was conducted, and three cross-sectional profiles were analyzed to determine their topography, yielding a median sediment thickness of 88.2cm. Based on these measurements, the sediment volume was …
Calculation Of Aquifer Transmissivity From Borehole Resistance Measurements And Pumping Test Results,
2025
Doctor Candidate, Department of Civil Engineering, National Chung-Hsing University, 145 Xingda Rd., Taichung 402, Taiwan
Calculation Of Aquifer Transmissivity From Borehole Resistance Measurements And Pumping Test Results, Fen-Rong Yang, Chien-Wei Huang, Tien-Kuen Huang
Journal of Marine Science and Technology–Taiwan
Transmissivity is a crucial hydrogeological parameter for evaluating groundwater resources. This parameter is conventionally evaluated using pumping tests; however, these tests are costly and can be conducted at few sites. Many researchers have used ground resistance and pumping test data to estimate various hydrogeological parameters. In this study, borehole resistance survey and pumping test data collected by the Taiwan Groundwater Monitoring Network were used to establish the relationship between transmissivity and formation factor for aquifers in the Zhuoshui River alluvial fan. This relationship was then used to estimate the water output of the aforementioned aquifers in a cost-effective manner from …
A Neural Network-Based Sliding Mode Adaptive Control System For Unmanned Surface Vehicles,
2025
Jiangsu Shipping College, Nantong, China.
A Neural Network-Based Sliding Mode Adaptive Control System For Unmanned Surface Vehicles, Sun Qiaomei, An Liang, Jiang Linglin
Journal of Marine Science and Technology–Taiwan
Over the past decades, numerous studies have explored the use of autonomous unmanned surface vehicles (USVs). Successful USV operation requires a robust tracking control system to perform a range of tasks. However, USV dynamics are uncertain, time-varying, and nonlinear. This paper presents a neural network-based sliding mode adaptive control (NNSMAC) system to enhance USV tracking performance. Trajectories were generated using spline and polynomial interpolation based on a set of N predefined waypoints. Simulation results show that the proposed method outperforms traditional sliding mode control in error reduction, enabling more effective tracking.
The First Iucn Red List Of Cold-Water Corals Highlights Global Declines,
2025
Senckenberg Research Institute and Natural History Museum
The First Iucn Red List Of Cold-Water Corals Highlights Global Declines, Julia D. Sigwart, A. Louise Allcock, Renata Carolina Mikosz Arantes, Kelsey Archer Barnhill, Narissa Bax, Julia S. Beneti, Saskia Brix, Gudmundur Gudmundsson, Catherine S. Mcfadden, Severin A. Korfhage, Christi Linardich, Declan Morrissey, Pedro De Oliveira Nascimento, Bárbara De Moura Neves, Steinunn H. Ólafsdóttir, Stefán Ragnarsson, Kaveh Samimi-Namin, Íris Sampaio, Mark E. De Wilt
Biological Sciences Faculty Publications
The most well-known species-based conservation tool is the International Union for the Conservation of Nature (IUCN) Red List of Threatened Species. The current coverage of species in the Red List is known to under-represent benthic marine species. Cold-water corals (CWCs) are increasingly recognised as key to deep-water biodiversity and integral to protected vulnerable marine ecosystems (VMEs), but no deep-sea coral species were previously included in the Red List. We selected 22 cold-water coral species in the Northeast Atlantic, including 4 reef-forming stony corals and 18 octocorals including sea pens and gorgonians, and completed the first IUCN Red List global assessments …
Thermal Tolerance Limits Of Mesophotic Corals In American Samoa,
2025
Old Dominion University
Thermal Tolerance Limits Of Mesophotic Corals In American Samoa, Daniel Barshis, Veronica Z. Radice, Katherine E. Parker, Nicholas Evensen
Biological Sciences Faculty Publications
We analyzed the thermal tolerances of multiple coral species from an upper mesophotic (38–40m) and a shallow reef (5–10m) with our portable Coral Bleaching Automated Stress System (CBASS). Depth generalist Montipora grisea (deep and shallow) and depth specialists Pachyseris speciosa and Leptoseris sp. (deep only) were assayed from Leone, located on the western coast of Tutuila in American Samoa. Fragments from 10 genotypes of each species were exposed to a 17-hour thermal stress assay reaching four maximum temperatures ranging from 30–38°C under in situ light conditions (150 μmol photons m−² s−¹ under a Lee Filters “deep …
Form And Function In Mobulids: A Comparative Analysis Of Filter Morphology With Bioinspiration Applications,
2025
California State University, Fullerton
Form And Function In Mobulids: A Comparative Analysis Of Filter Morphology With Bioinspiration Applications, J. B. Teeple, S. R. Kahane-Rapport, K. E. Cohen, L. Hamann, J. A. Strother, E. W. M. Paig-Tran
Biological Sciences Faculty Publications
Mobulas (manta and devil rays) are large-scale ram filter feeders that separate planktonic food particles from large volumes of water with minimal clogging. This contrasts with most human-made filters that can suffer from problematic clogging requiring additional mechanisms for clearing blocked surfaces and maintaining performance. Prior studies have shown that mobulas employ a unique mechanism referred to as ricochet separation to filter feed, whereby captive vortices in filter pores cause particles to bounce off the filter surfaces and away from the filter pores. This mechanism enables the filtration of particles smaller than the pore size and reduced clogging. However, few …
Using Environmental Dna Metabarcoding To Investigate Diversity And Seasonal Variation Of Fishes In Humboldt Bay, California,
2025
Cal Poly Humboldt
Using Environmental Dna Metabarcoding To Investigate Diversity And Seasonal Variation Of Fishes In Humboldt Bay, California, Johnathon M. Richardson
Cal Poly Humboldt theses and projects
This study applied environmental DNA (eDNA) metabarcoding to characterize fish diversity and temporal patterns in fish assemblage structure within Humboldt Bay, California. This work advances ecological understanding of Humboldt Bay’s ichthyofauna, regional natural history and ecosystem function. Over one year (February 2023–January 2024), triplicate surface-water samples were collected every two weeks from a fixed site in Humboldt Bay (n = 78). DNA was extracted from filters and amplified using MiFish 12S primers in six replicate PCRs per sample. Amplicon concentrations were normalized, pooled and sequenced on an Illumina MiSeq platform (2×150 bp). Sequences were processed using a custom bioinformatics pipeline, …
An Economic And Production Analysis Of Seaweed Farms In California And The Pacific Northwest,
2025
Cal Poly Humboldt
An Economic And Production Analysis Of Seaweed Farms In California And The Pacific Northwest, Brian Donovan
Cal Poly Humboldt theses and projects
Since the early 2010s, the seaweed aquaculture industry has steadily expanded in the United States, with states like Alaska, Maine, Hawaii, and Connecticut leading the way in the development of this emerging sector. However, information gaps remain concerning certain aspects of the domestic seaweed aquaculture industry. The purpose of this study was to examine the status of the seaweed aquaculture industry along the West Coast of the United States; specifically in the states of California, Oregon, and Washington. Seaweed farmers in these states were invited to voluntarily complete surveys asking important production, economic, and commercial questions regarding their operations. Data …
Cultivation Of Winged Kelp (Alaria Marginata) In Humboldt Bay,
2025
Humboldt State University
Cultivation Of Winged Kelp (Alaria Marginata) In Humboldt Bay, Evan C. Simpson
Cal Poly Humboldt theses and projects
The cultivation potential of the winged kelp (Alaria marginata) was evaluated in Humboldt Bay, California, to further develop sustainable aquaculture in the region. Seasonality, depth, and system design were evaluated in regard to harvest biomass and quality. Results suggested that single-longline configurations at shallow depths (< 2 m) produced greater total biomass than a multi-longline system, suggesting enhanced water flow and reduced self-shading improved growth. Kelp grew best with a winter outplanting period (December-April), most likely due to environmental conditions (e.g., temperature, nutrients, and salinity) being within the kelp’s tolerable range, with as much as 2.24 kg/meter of kelp being harvested. These findings demonstrate that while the estuarine system has more variable conditions than predicted, A. marginata can be successfully cultivated in Humboldt Bay and highlight its potential as a viable crop for northern California’s emerging seaweed industry. Future work targeting the optimization of single-longline design and deployment timing may further improve yield and support regional goals for sustainable aquaculture and food security.
A Porpoise-Driven Approach: Using Agent-Based Models To Predict Population Consequences Of Offshore Wind Noises On Gulf Of Maine Harbor Porpoises,
2025
Humboldt State University
A Porpoise-Driven Approach: Using Agent-Based Models To Predict Population Consequences Of Offshore Wind Noises On Gulf Of Maine Harbor Porpoises, Ben Greenberg Pridonoff
Cal Poly Humboldt theses and projects
Marine mammals are increasingly exposed to anthropogenic noises, including from offshore wind activities, necessitating the development and refinement of tools to predict the effects of noise on their populations. Agent-based models (ABMs) are an effective tool that can simulate realistic movements and behaviors of animals to quantify population consequences of disturbance. In this study, I used the Europe-based ABM ‘DEPONS’ to (1) evaluate its effectiveness in a new environment, the Gulf of Maine, USA/Bay of Fundy, Canada, and (2) develop estimates of the population dynamics of local harbor porpoises (Phocoena phocoena) interacting with expected noises from proposed floating …
Behavioral Responses To Underwater Noise,
2025
Edith Cowan University
Behavioral Responses To Underwater Noise, Christine Erbe, Capri Jolliffe, Renee Schoeman, Valeria Senigaglia, Cristina Tollefsen, Rebecca Wellard, Ann Bowles, Dorian Houser, Shyam Madhusudhana, Sarah A. Marley, Angela Recalde Salas, Chandra Salgado-Kent, Leah Trigg
Research outputs 2022 to 2026
This chapter presents an overview of physical and acoustic behavioral responses of marine mammals to underwater sounds. A literature review was undertaken, and data on received levels at the animal when certain types of responses were observed were compiled in an online supplementary spreadsheet. Based on this, an overview of responses was written, organized first by species and then by sound type. In-air and underwater sound sources were considered. The most studied sound types were mid-frequency sonar and acoustic deterrent devices and then impact pile driving and vessels. The most frequently reported response was avoidance, followed by changes in swim …
Varying Vulnerabilities: Seagrass Species Under Threat From Prolonged Ocean Warming,
2025
Edith Cowan University
Varying Vulnerabilities: Seagrass Species Under Threat From Prolonged Ocean Warming, Marnie L. Campbell, Chi T.U. Le
Research outputs 2022 to 2026
Understanding the response of various seagrass species to prolonged elevated water temperatures is crucial for effective management and seagrass species restoration amid increasing climate change-induced ocean warming and marine heat waves. This is especially important in intertidal seagrass meadows, where heat can penetrate substrate depths of up to 50 cm. We assessed and contrasted the responses of five intertidal species—Zostera muelleri Irmisch ex Asch, Halophila ovalis (R.Br.) Hook f., Halodule uninervis (Forssk.) Asch, Halophila decipiens Ostenf., and Halophila spinulosa (R.Br.) Asch—over a month of elevated temperatures by examining rhizome growth, number of living shoots, root development, and sprig survival. While …
Contrasting Tropical Marine Herbivorous Fish Catches Between The Indo-Pacific And Western Atlantic,
2025
Edith Cowan University
Contrasting Tropical Marine Herbivorous Fish Catches Between The Indo-Pacific And Western Atlantic, Lucas L. Lutzenkirchen, Sterling B. Tebbett, Helen F. Yan, David R. Bellwood
Research outputs 2022 to 2026
Ensuring food security in the Anthropocene presents a significant socio-ecological challenge, especially in rapidly changing coastal seascapes that sustain critical fisheries. Herbivorous fishes are essential for food and financial security through fisheries, however, their contributions to regional catches, and the factors influencing them, are not well understood. Analysing reported and reconstructed catch data across 69 Exclusive Economic Zones, we identify shallow-reef area and coastal population density as significant predictors of herbivorous fish catches. However, between-realm (i.e. Indo-Pacific vs. Western Atlantic) differences are marked, with rabbitfishes contributing disproportionately to herbivorous fishery catches. While rabbitfishes have the potential to support productive fisheries …
Non-Stereotypy (To Species) In Mysticete Downsweeps,
2025
Edith Cowan University
Non-Stereotypy (To Species) In Mysticete Downsweeps, Paul Nguyen Hong Duc, Christine Erbe, Shyam Madhusudhana, Daniel Wilkes, Lachlan Gill, Cristina Tollefsen, Narissa De Bruin, Aiyana Erbeking, Curt Jenner, Micheline Jenner, Angela Recalde-Salas, Chandra P. Salgado Kent, Kautilya Srivastava, Chong Wei, Robert Mccauley
Research outputs 2022 to 2026
The Australian EEZ provides habitat for ten species of mysticete whales seasonally supporting critical life functions ranging from feeding to breeding. All of these species produce downsweeping calls, which may confound passive acoustic monitoring efforts. In an attempt to optimize a detector for Eastern Indian Ocean pygmy blue whale (EIOPBW) downsweeps, we tried a spectrogram correlator based on confirmed templates and a neural network trained on general blue whale D-calls followed by clustering algorithms. Outputs were manually validated by bioacousticians. We found that downsweeps exhibit significant variability and form a graded continuum of acoustic features, as opposed to clusters. Comparative …
Global Patterns And Drivers Of Seagrass Biomass, Net Primary Production And Meadow Structure,
2025
Edith Cowan University
Global Patterns And Drivers Of Seagrass Biomass, Net Primary Production And Meadow Structure, Nicole R. Foster, Enric Gomis, Diana I. Montemayor, Simone Strydom, Miguel Angel Mateo, Eduard Serrano, Aurora M. Ricart, Martin Dahl, Ines Mazarrasa, Paulina Cisternas, Harry Whiteley, Elliott J. Bates, Viena Puigcorbé, Uxue Moreda, Mar Truc, Karina Inostroza, Rafael Huertas, Roisin Mccallum, Anna Lafratta, Chanelle L. Webster, Caitlyn M. O'Dea, Nicole E. Said, Carlos M. Duarte, Paul S. Lavery, Oscar Serrano
Research outputs 2022 to 2026
Aim: We decipher global patterns in seagrass growth and structure to advance seagrass science, facilitate multidisciplinary research, and promote effective management strategies and policy development for seagrass habitats. Location: Global. Time period: 1975 to 2024. Major taxa studied: Seagrasses—marine angiosperms. Methods: A global data set on seagrass total biomass, total net primary productivity (NPP), shoot density, and percent cover was compiled across 11 genera. We tested how these variables change across seagrass genera, life-history strategy, and geographic location; and then modelled the environmental drivers (temperature, nutrients, light availability) of the patterns observed. Results: The mean (±SE) total biomass of seagrasses …
Seagrasses Are Most Vulnerable To Marine Heatwaves In Tropical Zones: Local-Scale And Broad Climatic Zone Variation In Thermal Tolerances,
2025
Edith Cowan University
Seagrasses Are Most Vulnerable To Marine Heatwaves In Tropical Zones: Local-Scale And Broad Climatic Zone Variation In Thermal Tolerances, Nicole Said, Chanelle Webster, Simone Strydom, Natasha Dunham, Matthew P. Adams, Kathryn Mcmahon
Research outputs 2022 to 2026
Under a changing climate, it is imperative that we understand how species may respond to temperature impacts, which can differ among populations of the same species due to local drivers. Thermal tolerance data, which can be used to assess an organism's upper thermal limits, is valuable to identify species and/or populations' susceptibility to thermal stress. This study assessed the variation in thermal tolerance of six seagrass species at both broad latitudinal (c. 500–1000 km) and local scales (c. 25 km). Photosynthesis–temperature curves (15–45°C) were conducted, by measuring oxygen in closed incubation chambers, and thermal optima (Topt) was extracted. We found …
