The Autonomous University of Baja California Sur (in Spanish: Universidad Autónoma de Baja California Sur, UABCS) is a Mexican public university based in the state of Baja California Sur.Its library holds over 42,000 volumes.
The assessment of individual specialization in marine top predators provides insight into their role in marine ecosystems. The northern elephant seal (Mirounga angustirostris) is considered a generalist consumer; however, adult females could exhibit individual specialization to meet the energetic demands of reproduction. We evaluated foraging variability and individual specialization in adult females from the San Benito Archipelago (Mexican Pacific), using vibrissae from recently weaned pups as maternal proxies. Stable isotopes analyses (δ13C and δ15N) were conducted on vibrissae segments collected in two breeding seasons (2016–17 and 2022–23). Isotopic profiles showed consistent temporal patterns across years, with ¹³C and ¹⁵N-enriched values during the post-molting migration, and ¹³C-depleted values during lactation, reflecting maternal energy transfer. At colony level, isotopic niche widths (4.5–7.3‰2) indicate a generalist strategy. However, individual niches were considerably smaller (< 1‰2), revealing within colony partitioning. The individual specialization index (SI) revealed that 65
The present study aimed to assess the effects of chitosan nanocapsules loaded with synthetic carvacrol and thymol (structurally analogous to those in oregano oil) on the antioxidant and molecular response of Litopenaeus vannamei subjected to acute thermal stress. Chitosan nanocapsules (of 246 nm) were prepared and incorporated into shrimp feed at eight concentrations in triplicate: 0.0 (0ChNP), 0.033mg g− 1 (0.03ChNP), 0.1mg g− 1 (0.1ChNP), 0.2mg g− 1 (0.2ChNP), 0.3mg g− 1 (0.3ChNP), 0.467mg g− 1 (0.5ChNP), 0.633mg g− 1 (0.6ChNP), and 0.8mg g− 1 (0.8ChNP). Twenty-four aquariums, each containing three shrimp (10.25 ± 1.14 g), were fed for two weeks. The first 8 days at 27 ± 0.5 °C, followed by a gradual temperature increase to 39 °C. Thereafter, shrimps were sampled, and the hepatopancreas dissected and divided into two, and individually stored in RNAlater for transcriptomic and qPCR analysis. The groups 0ChNP, 0.03ChNP, and 0.3ChNP were selected for transcriptomic analysis based on their physical appearance, and mortality rate. At 0.03ChNP, significant upregulation of genes associated with innate immunity, vesicular trafficking, and autophagy was detected, suggesting an activated protective response. On the other hand, the qPCR on anti-oxidative enzymes, catalase and glutathione peroxidase, showed lower levels than in the control experiments suggesting reduced oxidative stress when chitosan nanocapsules were supplied, especially with 0.3ChNP. In conclusion, chitosan nanocapsules delivering carvacrol and thymol at 0.3 mg g− 1 of feed modulate distinct molecular pathways that contribute to thermal stress resilience in shrimp. Doses below or above this threshold were ineffective or detrimental under the conditions tested.
This study aims to identify the factors influencing aesthetic visitors' continuance usage intention of websites and social media as digital marketing tools. Based on the technology acceptance model, four constructs were included: perceived ease of use, perceived usefulness, website quality and social media. The information was obtained by applying an online survey to a sample of 271 aesthetic visitors in Tijuana, Mexico, who were patients of an aesthetic clinic in the city. Exploratory factor analysis, average variance explained, and composite reliability were conducted to ensure the validity of each construct. Multiple regression analysis was done to identify predictors of travellers' continuance usage intentions of digital marketing tools. Results indicate that perceived usefulness, website quality, and social media significantly and positively influence continuance usage intention, while perceived ease of use does not show a significant effect. Website quality emerged as the strongest predictor, followed by social media, underscoring the critical role of technological design and social interaction in shaping digital marketing adoption. The study contributes to theory by extending TAM with context-specific constructs in the aesthetic tourism sector, a context where technology adoption remains underexplored. By focusing on continuance usage intention of aesthetic visitors, the study provides a model tailored to physicians and destination managers, offering practical guidance to enhance competitiveness in this growing market segment.
