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Influence of local and landscape environmental factors on alpha and beta diversity of macroinvertebrates in Andean rivers

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Journal of Mountain Science 2023年第9期20卷 2487-2501页

作者： DIAZ-ROJAS Camila A PEDROZA-RAMOS Adriana X BARRERA-HERRERA July A roa-fuentes.camilo a Ecology Unit in Aquatic Systems Research Group Pedagogical and Technological University of ColombiaUPTCAvenida Central del Norte 39-115TunjaBoyacáColombia

Research on macroinvertebrate community structure in Andean rivers has been oriented towards describing patterns of alpha and gamma diversity by taking into account environmental predictors at local spatial scales(e.g.,micro-and mesohabitats).However,the patterns of beta diversity and the importance of landscape-scale variables have been evaluated to a lesser *** objective of this study was to describe the patterns of alpha and beta diversity of benthic macroinvertebrates in the Andean rivers of the Orinoco basin and their relationship with local and landscape environmental variation.A stratified random sampling of macroinvertebrates was carried out at 40 sites(comprising an altitudinal range of between 500 and 2900 m.a.s.l.),local and landscape variables were *** results showed that the variation of alpha diversity was influenced by local and landscape variables,which are directly and indirectly related to the contribution of sediments,substrate composition and flow velocity,providing a heterogeneity of *** beta diversity was explained by the combined effect of local and landscape *** the beta diversity phenomena,turnover was predominant while nestedness presented a minor contribution and both were explained in greater proportion by local descriptors and some landscape variables,specifically those of a geomorphological *** results concur with the view of an environmental and spatial hierarchy within the river habitat and highlight the influence of multiple scales on macroinvertebrate *** above suggests that both local and landscape scales must necessarily be considered for environmental management and the conservation of Andean lotic ecosystems.

关键词： Andean lotic systems Andean agroecosystems Instream habitat Landcover Turnover Nestedness

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Diagnosis and management of brain metastases:an updated review from a radiation oncology perspective

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Journal of Cancer Metastasis and Treatment 2019年第7期4卷 12-27页

作者： Gutiérrez-Valencia Enrique Sánchez-Rodríguez Irving Balderrama-Ibarra Ricardo fuentes-LaraJesús Rios-Martínez Alan Vázquez Aldana Arroyo Iñigo Bayardo-López Luis Hernández ChávezAllan Puebla-Mora Ana Graciela Nader-roa Liliana Espíritu-Rodríguez Roque Instituto Mexicano del Seguro Social(IMSS) Departamento de Radio-OncologíaCentro Médico Nacional de OccidenteUniversidad de GuadalajaraGuadalajara 44340México Instituto Mexicano del Seguro Social(IMSS) Departamento de Anatomía PatológicaCentro Médico Nacional de OccidenteUniversidad de GuadalajaraGuadalajara 44340México Instituto Mexicano del Seguro Social(IMSS) Departamento de Física MédicaCentro Médico Nacional de OccidenteGuadalajara 44340México

Brain metastasis are the most common intracranial malignancy in the adult population. Their incidence has increased dramatically over the last 20 years, as a result of the increasing number of cases stemming from lung and breast cancer together with the higher cancer survival rates due to diagnostic and therapeutic advances. More than 40%of cancer patients develop brain metastases during the course of their disease: specifically, they appear in 50%of patients with lung cancer, more than 25% of patients with breast cancer, and 20% of patients with melanoma. Diagnosis is made using different imaging approaches, such as computed tomography and magnetic resonance imaging, accompanied by clinical manifestations and a history of malignancy supporting the diagnosis of a brain metastasis. Current treatment options should be oriented to the patient's current performance, the number of intracranial and extracranial lesions, and related factors. Although surgical resection and whole-brain radiotherapy have been standard treatments for many years, numerous treatment modalities have become more easily available and accepted worldwide, producing more favorable and reliable results. Among these is stereotactic radiosurgery, and the latest clinical trials support this treatment.

关键词： Brain metastases whole-brain radiation therapy stereotactic radiosurgery graded prognostic assessment

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Mercury in Canned Tuna in *** Light Tuna Really Light?

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Food and Nutrition Sciences 2013年第7期4卷 48-54页

作者： Montserrat González-Estecha María JoséMartínez-García Manuel fuentes-Ferrer Andrés Bodas-Pinedo Alfonso Calle-Pascual JoséMaría Ordóñez-Iriarte Cristina Fernández-Pérez Nieves Martell-Claros MiguelÁngel Rubio-Herrera Emilia Gómez-Hoyos JoséJesús Guillén-Pérez Trace Element Unit and Laboratory Medicine Department Instituto de Investigación SanitariaHospital Clínico San CarlosMadridSpain Universidad Politécnica CartagenaSpain Universidad camilo Jose Cela MadridSpain Department of Epidemiology Instituto de Investigación SanitariaHospital Clínico San CarlosMadridSpain Department of Pediatrics Instituto de Investigación SanitariaHospital Clínico San CarlosMadridSpain Department of Endocrinology Instituto de Investigación SanitariaHospital Clínico San CarlosMadridSpain Consejería de Sanidad y Consumo MadridSpain Hypertension Unit Instituto de Investi-gación SanitariaHospital Clínico San CarlosMadridSpain Publich Health Department CartagenaSpain Universidad de Murcia MurciaSpain

In Spain, certain population-based studies have shown high blood mercury (Hg) levels due to the high consumption of fish. Some studies have stated that one of the most consumed fish in Spain is canned tuna. Different Spanish organisms consider that it is safe to consume canned tuna as it supposedly has a low mercury content, particularly in so-called light tuna. However, in Spain light tuna is mainly yellowfin and bigeye tuna, while in other countries it is mainly skipjack tuna. This study analyzed 36 cans of the most popular brands in Spain and examined the influence of the type of tuna, packaging medium (olive oil, sunflower seed oil, water or marinade), different brands, prices and expiration dates. Mercury concentrations (mg/kg) were measured by atomic absorption spectrometry and thermal decomposition amalgamation. The medians observed were (mg/kg): light tuna: 0.314;IQR: 0.205 - 0.594, white tuna: 0.338;IQR: 0.276 - 0.558, skipjack: 0.311;IQR: 0.299 - 0.322, frigate tuna: 0.219;IQR 0.182 - 0.257 and mackerel: 0.042;IQR 0.029 -?0.074. We found statistically significant differences between white tuna, light tuna and mackerel (p = 0.004);light tuna and mackerel (p = 0.002) and white tuna and mackerel (p = 0.006). However, we found no differences between white tuna and light tuna, or among packaging medium, brands, prices or expiration dates. The limit of 0.500 mg/kg of mercury in canned tuna was exceeded by the following percentages of the cans: 33.3% of light tuna, 16.7% of white tuna, and 0% of Skipjack, frigate tuna and mackerel. The mercury content of the cans of Spanish light tuna that were analyzed was variable and high. The results of this study indicate that stricter regulation of Hg in canned tuna is necessary. Until then, it is safer to recommend that vulnerable populations such as children and pregnant women consume canned mackerel, which has a markedly lower mercury content.

关键词： Mercury Canned Tuna Spain

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