scholarly journals Daily, seasonal, and annual variability of temperature in streams inhabited by the endemic San Pedro Martir trout (Oncorhynchus mykiss nelsoni), in Baja California, Mexico, and the predicted temperature for the years 2025 and 2050

2021 ◽  
Vol 80 (2) ◽  
Author(s):  
Iván Alejandro Meza-Matty ◽  
Gorgonio Ruiz-Campos ◽  
Luis Walter Daesslé ◽  
Arturo Ruiz-Luna ◽  
Álvaro Alberto López-Lambraño ◽  
...  
Keyword(s):  
Oncorhynchus Mykiss ◽  
Water Temperature ◽  
Baja California ◽  
San Antonio ◽  
Maximum Temperature ◽  
Western Slope ◽  
Altitudinal Distribution ◽  
Average Water Temperature ◽  
Annual Variability ◽  
San Pedro

The present study measured the daily, seasonal, and annual variability of the water temperature of streams in which the endemic rainbow trout, Oncorhynchus mykiss nelsoni, is distributed on the western slope of the Sierra San Pedro Mártir, Baja California, Mexico, between 1996 and 2019. The seasonal thermal interval and daily duration of summer temperatures above the thermal threshold for this trout subspecies (≥ 28°C) were determined in streams at different elevations (553, 1,220, and 2,080 masl, or meters above sea level). Temperatures ≥ 28°C were recorded at the study site on the stream with the lowest elevation (San Antonio de Murillos Creek) over an accumulated 365 h between June and September 2014, with the maximum temperature recorded there, 30.66 °C, making it the site most vulnerable to climate change. At the San Antonio de Murillos Creek, the average water temperature predicted by three models (GFDL R30, HadCM3, and Mote) for the year 2025 would be a non-lethal temperature, < 28 °C, for trout at a minimum elevation of 491-511 masl, while this was predicted to be 545-701 masl for the year 2050. Predicted hourly water temperatures of 28°C (non-lethal) may occur at minimum elevations of 868-898 masl in 2025 and at 908-1028 masl in 2050, reducing a 21-23% and 23-31% its current altitudinal distribution range, respectively, thus avoiding its presence at the type locality (San Antonio de Murillos).

Analysis on Distribution Trends of Affecting Red Tide Factors in the Beibu Gulf Inshore

2014 ◽  
Vol 675-677 ◽  
pp. 886-891
Author(s):  
Xin Xie ◽  
Long Hui Yang ◽  
Ping Xian ◽  
Qing Hua Jiang
Keyword(s):  
Water Temperature ◽  
Red Tide ◽  
Chlorophyll Concentration ◽  
Lower Percentage ◽  
Maximum Temperature ◽  
Beibu Gulf ◽  
Red Tides ◽  
Average Water Temperature ◽  
Maximum Temperature Difference ◽  
Distribution Trends

Analysis on distribution trends of affecting red tide factors in the Beibu Gulf inshore based on data were monitored by automatic water quality monitoring network in 2011 and 2013, providing the scientific basis for preventing disasters and reducing damages of the red tide. Results showed that, average water temperature of Beibu Gulf are maintained in 21.5 °C ~27 °C in two years, the same station maximum temperature difference is 2.72 °C, and is gradually increased since West to East and rose yearly; pH are maintained in 7.8~8.3, are partial alkaline and relative compared stable, then pH of enclosed sea are below offshore waters, which in pH interval of red tide easy outbreak, existing high risk. DO concentration are between 6.3~7.7mg/L, does not have the foundation of extensive outbreak red tides. Lower percentage of DO in enclosed sea and with less material flux in offshore waters, so enclosed sea are high-incidence areas. Chlorophyll concentration in 2013 are almost lower than 2011, and smaller fluctuations. The environmental capacity of the waters in the Beibu Gulf is getting saturated; therefore, it should closely monitor water temperature, pH, and DO and chlorophyll concentration for predicting red tide.

Health and Health Care Problems Among the Kumiai of San Antonio Necua and Their Indigenous Relatives in Baja California

2003 ◽  
Vol 1 (1) ◽  
pp. 140-157 ◽  
Author(s):  
K. Jill Fleuriet
Keyword(s):  
Health Care ◽  
Baja California ◽  
San Antonio ◽  
Rural Poverty ◽  
Indigenous Communities ◽  
Traditional Healers ◽  
Medical Pluralism ◽  
Indigenous Groups ◽  
Health And Illness ◽  
Care Problems

The rural Kumiai community of San Antonio Necua is one of the few remaining indigenous communities in Baja California, Mexico. Necuan health and health care problems are best understood through a consideration of the effects of colonialism and marginalization on indigenous groups in northern Baja California as well as a tradition of medical pluralism in Mexico. The lack of traditional healers and biomedical providers in the community, high rates of preventable or manageable illnesses, and a blend of biomedical, folk mestizo, and traditional indigenous beliefs about health and illness reflect current conditions of rural poverty and economic isolation. Descriptions of health and health care problems are based on ethnographic fieldwork among the Kumiai, their Paipai relatives, and their primary nongovernmental aid organization.

scholarly journals Simultaneous generalized and low-layer SCIDAR turbulence profiles at san pedro mártir observatory

2019 ◽  
Vol 490 (1) ◽  
pp. 1397-1405 ◽  
Author(s):  
R Avila ◽  
O Valdés-Hernández ◽  
L J Sánchez ◽  
I Cruz-González ◽  
J L Avilés ◽  
...  
Keyword(s):  
High Altitude ◽  
Wind Direction ◽  
Close Agreement ◽  
Baja California ◽  
Ground Level ◽  
Combined Effect ◽  
Moderate Altitude ◽  
San Pedro ◽  
Simultaneous Measurements

ABSTRACT We present optical turbulence profiles obtained with a Generalized SCIDAR (G-SCIDAR) and a low-layer SCIDAR (LOLAS) at the Observatorio Astronómico Nacional in San Pedro Mártir (OAN-SPM), Baja California, Mexico, during three observing campaigns in 2013, 2014, and 2015. The G-SCIDAR delivers profiles with moderate altitude-resolution (a few hundred metres) along the entire turbulent section of the atmosphere, while the LOLAS gives high altitude resolution (on the order of tens of metres) but only within the first few hundred metres. Simultaneous measurements were obtained on 2014 and allowed us to characterize in detail the combined effect of the local orography and wind direction on the turbulence distribution close to the ground. At the beginning of several nights, the LOLAS profiles show that turbulence peaks between 25 and 50 m above the ground, not at ground level as was expected. The G-SCIDAR profiles exhibit a peak within the first kilometre. In 55 per cent and 36 per cent of the nights stable layers are detected between 10 and 15 km and at 3 km, respectively. This distribution is consistent with the results obtained with a G-SCIDAR in 1997 and 2000 observing campaigns. Statistics computed with the 7891 profiles that have been measured at the OAN-SPM with a G-SCIDAR in 1997, 2000, 2014, and 2015 campaigns are presented. The seeing values calculated with each of those profiles have a median of 0.79, first and third quartiles of 0.51 and 1.08 arcsec, which are in close agreement with other long term seeing monitoring performed at the OAN-SPM.

scholarly journals A coastal population of Large-blotched Ensatina Ensatina klauberi (Caudata: Plethodontidae) in Baja California, México

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1649 ◽  
Author(s):  
Jorge Heriberto Valdez-Villavicencio ◽  
Anny Peralta-Garcia ◽  
Bradford Damion Hollingsworth
Keyword(s):  
Baja California ◽  
Volcanic Field ◽  
Species Range ◽  
Oak Woodlands ◽  
Coastal Population ◽  
San Pedro ◽  
Sierra San Pedro Martir

We found a new population of Ensatina klauberi in San Quintín volcanic field, Baja California. It represents the first coastal population of this species. This record extends the species range ca. 71 km southwest of the southernmost record of E. klauberi in the Sierra San Pedro Mártir and represents the first population discovered outside of coniferous and pine-oak woodlands.

scholarly journals Micronucleus occurrence in diploid and triploid rainbow trout (Oncorhynchus mykiss Walbaum)

2012 ◽  
Vol 48 (No. 8) ◽  
pp. 215-220 ◽  
Author(s):  
I. Strunjak-Perovic ◽  
R. Coz-Rakovac ◽  
N. Topic Popovic
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Water Temperature ◽  
Peripheral Circulation ◽  
Ploidy Levels ◽  
Mean Values ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Significant Difference

The aim of the study was to observe the influence of different ploidy levels in fish on micronucleus occur&shy;rence. Twenty minutes after fertilization, one group of rainbow trout eggs was exposed to water temperatures of 26&deg;C in duration of 20 minutes to induce triploidy. Second group was kept in water temperature of 10&deg;C, which is optimal for development of rainbow trout. The frequency of micronucleated erythrocytes was determined in the peripheral circulation of rainbow trout 67 days (following absorption of the yolk &ndash; swim-up stage) and 128 days (fry stage) post fertilization. There was a significant difference (P &lt; 0.001) between frequency of micronucleated erythrocytes of diploid (1.10 &plusmn; 0.96&permil;) and triploid (2.41 &plusmn; 1.28&permil;) fish at swim-up stage. Increased mean values of micronucleus in diploid (1.80 &plusmn; 1.57&permil;) and triploid (5.92 &plusmn; 3.80&permil;) fry were also recorded.

scholarly journals The physical structure of NGC 2440

1997 ◽  
Vol 180 ◽  
pp. 218-218
Author(s):  
L. Cuesta ◽  
J. P. Phillips
Keyword(s):  
Detailed Analysis ◽  
Baja California ◽  
Physical Structure ◽  
Outer Shell ◽  
Monochromatic Imaging ◽  
Bipolar Outflow ◽  
San Pedro

We have acquired monochromatic imaging of the bipolar outflow source NGC 2440 in 12 ionic transitions using the 1.5 m Telescope at the Observatorio de San Pedro Mártir, Ensenada, Baja California, Mexico. As a result, we have been able to undertake detailed analysis of the shell ionisation structure. Then, we found that excitation is high close the center, extending towards the exterior at located radial positions. Edges and ansae are zones of low excitation indicating probably shock regions, in particular the outer shell.

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