scholarly journals Results of Archaeological Monitoring of the Spring Lake Section 206 Aquatic Ecosystem Restoration Project, Texas State University-San Marcos, Hays County, Texas

2012 ◽  
Vol 2012 (1) ◽  
pp. Article 6
Author(s):  
Carole Leezer ◽  
David Yelacic ◽  
Amy Benton ◽  
Jacob Hooge ◽  
Patricia Christmas
Keyword(s):  
Aquatic Ecosystem ◽  
Ecosystem Restoration ◽  
State University ◽  
Restoration Project ◽  
San Marcos ◽  
Spring Lake

The Clear-water Paradox of Aquatic Ecosystem Restoration

Fisheries ◽  
2007 ◽  
Vol 32 (3) ◽  
pp. 125-128 ◽  
Author(s):  
Paul J. Anders ◽  
Ken I. Ashley
Keyword(s):  
Aquatic Ecosystem ◽  
Ecosystem Restoration ◽  
Clear Water

Assessing aquatic ecosystem health through the analysis of plankton biodiversity

2019 ◽  
Vol 70 (5) ◽  
pp. 647 ◽  
Author(s):  
N. F. Shao ◽  
S. T. Yang ◽  
Y. Sun ◽  
Y. Gai ◽  
C. S. Zhao ◽  
...  
Keyword(s):  
Aquatic Ecosystem ◽  
Ecosystem Health ◽  
Diversity Index ◽  
Ecosystem Restoration ◽  
Freshwater Ecosystems ◽  
Assessment Model ◽  
City Centre ◽  
Temporal And Spatial Distribution ◽  
Wiener Diversity Index ◽  
The City

Healthy plankton communities are the foundation of many freshwater food webs. Their biodiversity is often used to directly reflect the health of the rivers. Globally, river ecosystem restoration is a critical issue and many freshwater ecosystems, especially in cities, are degraded because of intensive human activities. This is true for Jinan, China’s first pilot city for the Water Ecological Civilisation Project. The outcomes of aquatic ecosystem restoration in the city will directly affect the success or failure of the construction of aquatic ecological civilisations across the entire country; therefore, there is an urgent need for research on the assessment of river health in Jinan based on plankton biodiversity. As such, this study gathered data on the distribution of plankton (phytoplankton and zooplankton) in Jinan by collecting three sets of samples from 59 aquatic ecosystem monitoring stations in spring, summer and autumn of 2015. In all, 104 species of phytoplankton and 56 species of zooplankton were identified. Diatoms, Chlorophyta, and Cyanophyta accounted for 50, 31 and 15% respectively of phytoplankton, and rotifers, Protozoa and cladocerans accounted for 39, 31 and 17% respectively of zooplankton. We constructed a plankton health assessment model based on the Shannon–Wiener diversity index for analysis of the temporal and spatial distribution. According to the overall health distribution diagram, spatially health status was significantly better in north and south Jinan than in the city centre; temporally, spring water ecosystem health was better than in summer and autumn. These conclusions provide a theoretical basis and direction for the restoration of aquatic ecosystems in Jinan, and the methods used in this study can serve as a reference for aquatic ecosystem evaluation in developing countries.

scholarly journals Recovery of Salmonella from biofilms in a headwater spring ecosystem

2011 ◽  
Vol 9 (3) ◽  
pp. 458-466 ◽  
Author(s):  
James P. Gaertner ◽  
Joseph A. Mendoza ◽  
Michael R. J. Forstner ◽  
Dittmar Hahn
Keyword(s):  
Pathogenic Bacteria ◽  
Chain Reaction ◽  
Selective Enrichment ◽  
Animal Wastes ◽  
San Marcos ◽  
Polymerase Chain ◽  
Spring Lake ◽  
Precipitation Events

Salmonellae are pathogenic bacteria often detected in waters impacted by human or animal wastes. In order to assess the fate of salmonellae in supposedly pristine environments, water and natural biofilm samples along with snails (Tarebia granifera) and crayfish (Procambarus clarkia) were collected before and up to 7 days following four precipitation events from sites within the headwater springs of Spring Lake, San Marcos, TX. The samples were analyzed for the presence of salmonellae by polymerase chain reaction (PCR) after semi-selective enrichment. Salmonellae were detected in one water sample directly after precipitation only, while detection in ten biofilm and two crayfish samples was not related to precipitation. Salmonellae were not detected in snails. Characterization of isolates by rep-PCR revealed shared profiles in water and biofilm samples, biofilm and crayfish samples, and biofilm samples collected 23 days apart. These results suggest that salmonellae are infrequently washed into this aquatic ecosystem during precipitation runoff and can potentially take up residency in biofilms which can help facilitate subsequent long-term persistence and eventual transfer through the food chain.

scholarly journals An assessment of the effectiveness of a long-term ecosystem restoration project in a fynbos shrubland catchment in South Africa

2017 ◽  
Vol 185 ◽  
pp. 1-10 ◽  
Author(s):  
Jennifer M. Fill ◽  
Greg G. Forsyth ◽  
Suzaan Kritzinger-Klopper ◽  
David C. Le Maitre ◽  
Brian W. van Wilgen
Keyword(s):  
South Africa ◽  
Ecosystem Restoration ◽  
Restoration Project

scholarly journals Archaeological Survey for the Lower Greens Bayou Trail Project, Segments GR02 and GR03, in Harris County, Texas

2020 ◽  
Author(s):  
Michael Quennoz ◽  
Jacob Hilton ◽  
Amanda Kloepfer ◽  
Tony Scott
Keyword(s):  
Cultural Resources ◽  
Archaeological Survey ◽  
Late Prehistoric ◽  
State University ◽  
Harris County ◽  
Project Area ◽  
Historic Structures ◽  
San Marcos ◽  
Indirect Impacts ◽  
Trail Development

Over several mobilizations between April 2018 and January 2020, Gray & Pape, Inc., of Houston, Texas, conducted an intensive pedestrian cultural resources survey of two segments (Segments GR02 and GR03) of proposed trail development along Lower Greens Bayou in the City of Houston, Harris County, Texas. The project alignment measures approximately 10.8 kilometers (6.7 miles) in length and encompasses approximately 9.6 hectares (23.7 acres) of area. Another 0.6 kilometers (0.4 miles) or 0.6 hectares (1.4 acres) of project alignment was removed from consideration. In total, approximately 11.4 kilometers (7.1 miles) or 10.2 hectares (25.1 acres) was surveyed for the project. Because the proposed trail development occurs on publicly owned properties a Texas Antiquities Code Permit was required prior to survey. All work was completed under Texas Antiquities Permit #8328, which was assigned by the Texas Historical Commission on February 14, 2018. Fieldwork and reporting activities were performed according to procedures set forth by the Texas Historical Commission and the Council of Texas Archeologists. The goals of the survey were to establish whether or not previously unidentified archaeological resources were located within the project area, also defined as the project’s Area of Potential Effects, and whether the proposed development would affect any previously identified cultural resources. Prior to fieldwork, site file and background research was conducted, including a review of historic aerial and topographic maps in an attempt to locate any historic structures associated with the Area of Potential Effects. Site file review and background research indicated that there are no previously recorded sites within the project Area of Potential Effects. Fieldwork took place between April 10, 2018 and January 7, 2020 and consisted of a combination of pedestrian survey and shovel testing. Systematic shovel testing was performed along a single transect over both project segments resulting in 131 shovel tests being excavated, of which 11 were positive for cultural material. The survey revealed that large portions of both project segments have been heavily disturbed by development and flood events, however, three new archaeological sites, 41HR1234, 41HR1235, and 41HR1236, and one historic Isolate were identified as a result of survey. Site 41HR1234 was identified as a mid-twentieth century historic trash midden. Site 41HR1235 was identified as a Late Prehistoric ephemeral campsite. Site 41HR1236 was identified as a multicomponent prehistoric campsite and historic isolate. Diagnostic artifacts were observed at all three sites; however, it is the recommendation of Gray & Pape, Inc. that only Sites 41HR1235 and 41HR1236 are significant in the materials they contain and their potential to offer additional research potential. Direct impacts to both sites have been avoided by the project alignment as currently planned. While indirect impacts such as looting are a concern, the distance between the sites and the current alignment as well the density of woods surrounding them minimizes the danger as a result of the project. Eligibility testing is recommended for the sites if they cannot be avoided by future projects. Based on the results of this survey, Gray & Pape, Inc. recommends that the no further cultural resources work be required for the project as currently planned and that the project be cleared to proceed. As specified under the conditions of Texas Antiquities Code Permit #8328, all project associated records are curated with the Center of Archaeological Studies at Texas State University in San Marcos, Texas.

scholarly journals Capacidad fecundante de espermatozoides epididimarios de Cavia porcellus "cuy" mantenidos en estrés hipotérmico

Biotempo ◽  
2017 ◽  
Vol 8 ◽  
pp. 15-21
Author(s):  
Hugo Gonzales Figueroa ◽  
Hugo Mauricio Gonzales Molfino
Keyword(s):  
North Carolina ◽  
Cavia Porcellus ◽  
State University ◽  
North Carolina State University ◽  
San Marcos

Durante el estrés hipotérmico los espermatozoides de cuy conservan sus patrones de capacitación espermática, hiperactivación, reacción del acrosoma y fecundación in vitro El piruvato, componente del medio de cultivo San Marcos (SM), sería la fuente energética preferencial para mantener la supervivencia espermática en estrés hipotérmico prolongado, a lo mejor, regulando el metabolismo oxidativo en el espermatozoide. De la misma manera se constituiría en el sustrato ideal de la piruvato deshidrogenasa para iniciar la capacitación e hiperactivación cuando los espermatozoides son incubados a 37°C. El imidazol provoca reacción acrosómica espontánea en los espermatozoides hiperactivos y permite que estos puedan interaccionar con ovocitos maduros, fecundarlos e iniciar el desarrollo embrionario temprano hasta blastocisto. La madurez ovocitaria se consiguió cultivando Complejos Ovocito-Cumulo (COCs) en el medio North Carolina State University 23 (NCSU-23), usado por primera vez para cuy En este trabajo se demuestra que la hipotermia prolongada a 5°C en un medio químicamente definido, SM, no afecta los procesos espermáticos fundamentales para la adquisición de la capacidad fértil del espermatozoide de cuy.

scholarly journals The Ka`ena Point Natural Area Reserve Ecosystem Restoration Project: A Predator Exclusion Fence

2010 ◽  
Vol 24 ◽  
Author(s):  
Christopher , J. Miller ◽  
Lindsay , C. Young ◽  
Eric , A. VanderWerf ◽  
David , G. Smith ◽  
Randy Kennedy ◽  
...  
Keyword(s):  
Ecosystem Restoration ◽  
Natural Area ◽  
Restoration Project ◽  
Predator Exclusion
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