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Selecting the best:Interspecific and age-related diet differences among sympatric steppe passerines

Avian Research 2023年第4期14卷 611-622页

作者： Julia Zurdo Paula Gomez-Lopez Adrian Barrero Daniel Bustillo-de la Rosa Julia Gomez-Catasús margarita reverter Cristian Perez-Granados Manuel B.Morales Juan Traba Terrestrial Ecology Group Department of EcologyUniversidad Autonoma de Madrid(TEG-UAM)MadridSpain Centro de Investigacion en Biodiversidady Cambio Global Universidad Autonoma de Madrid(CIBC-UAM)MadridSpain Ecology Department/IMEM“Ramon Margalef” Universidad de AlicanteAlicanteSpain

Parental food provisioning is crucial for the growth and survival of *** rate depends on food quality and food supplied to offspring may differ from what adults use for their *** the case of steppe passerine birds,detailed characterization on nestling dietary composition,as well as prey choice and resource partitioning among species,is a pending *** differences between nestlings and adults remain also largely *** using faecal DNA metabarcoding,we described the diet of nestlings and adults of five shrub-steppe passerine species over the 2017–2019 breeding seasons in central *** also monitored arthropod availability in the field to assess dietary *** expected interspecific dietary differences to limit competition for food resources among sympatric species,as well as parental selection of high quality prey for *** also predicted age-related differences,with nestlings being fed nutrient-rich prey more frequently than *** main arthropod orders provisioned to nestlings were Orthoptera,Julida,Araneae and *** of the different species showed high interspecific diet overlap,indicating both a coincidence in growth needs among bird species and no or little limitation of the most profitable resources during the breeding *** of all species showed higher diet richness than nestlings,and age-related differences in prey composition were mainly driven by the selection of the most easily digestible,larger protein-and calcium-rich prey for nestlings,which may favour their rapid growth,and avoiding highly sclerotized and less nutritional prey such as *** study sheds light on the basic ecology and conservation of these declining steppe birds,indicating that interspecific competition may not be a major factor during the breeding *** the current global decline of arthropods,further long-term research would be necessary,along with the implementation of effective conservation measure

关键词： 18S Faecal material Nestling diet Prey choice Resource partitioning

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Mining Gene Expression Profiles:An Integrated Implementation of Kernel Principal Component Analysis and Singular Value Decomposition

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Genomics, Proteomics & Bioinformatics 2010年第3期8卷 200-210页

作者： Ferran reverter Esteban Vegas Pedro Sánchez Department of Statistics Faculty of BiologyUniversity of Barcelona

The detection of genes that show similar profiles under different experimental conditions is often an initial step in inferring the biological significance of such genes. Visualization tools are used to identify genes with similar profiles in microarray studies. Given the large number of genes recorded in microarray experiments, gene expression data are generally displayed on a low dimensional plot, based on linear methods. However, microarray data show nonlinearity, due to high-order terms of interaction between genes, so alternative approaches, such as kernel methods, may be more appropriate. We introduce a technique that combines kernel principal component analysis （KPCA） and Biplot to visualize gene expression profiles. Our approach relies on the singular value decomposition of the input matrix and incorporates an additional step that involves KPCA. The main properties of our method are the extraction of nonlinear features and the preservation of the input variables （genes） in the output display. We apply this algorithm to colon tumor, leukemia and lymphoma datasets. Our approach reveals the underlying structure of the gene expression profiles and provides a more intuitive understanding of the gene and sample association.

关键词： kernel method biplot gene expression profile dimension reduction

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Exploring the potential for an evolutionarily conserved role of the taste 1 receptor gene family in gut sensing mechanisms of fish

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Animal Nutrition 2022年第4期11卷 293-308页

作者： Anna Rita Angotzi Esther Leal Sara Puchol José M. Cerdá-reverter Sofia Morais Department of Fish Physiology and Biotechnology Instituto de Acuicultura de Torre de la SalIATS-CSICTorre la Sal s/nRibera de Cabanes12595 CastellonSpain Lucta S.A. Innovation DivisionAnimal Science UnitUAB Research Park08193 BellaterraSpain

In this study,we investigated the transcriptional spatio-temporal dynamics of the taste 1 receptor(T1R)gene family repertoire in seabream(Sparus aurata[sa]),during larval ontogeny and in adult *** early larval development,sa T1R expression arises heterochronously,*** extraoral taste-related perception in the gastrointestinal tract(GIT)anticipates first exogenous feeding(at 9 days post hatching[dph]),followed by the buccal/intraoral perception from 14 dph onwards,supporting the hypothesis that the early onset of the molecular machinery underlying sa T1R expression in the GIT is not induced by food but rather genetically *** adulthood,we characterized the expression patterns of sa T1R within specific tissues(n=4)distributed in oropharingeal,GIT and brain regions substantiating their functional versatility as chemosensory signaling players to a variety of biological functions beyond oral taste ***,we provided for the first time direct evidences in fish for m RNA coexpression of a subset of sa T1R genes(mostly sa T1R3,*** common subunit of the heterodimeric T1R complexes for the detection of“sweet”and“umami”substances),with the selected gut peptides ghrelin(ghr),cholecystokinin(cck),hormone peptide yy(pyy)and proglucagon(pg).Each peptide defines the enteroendocrine cells(ECCs)identity,and establishes on morphological basis,a direct link for T1R chemosensing in the regulation of fish digestive ***,we analyzed the spatial gene expression patterns of 2 taste signaling components functionally homologous to the mammalian G(i)a subunit gustducin,namely sa G(i)a1 and sa G(i)a2,and demonstrated their co-localization with the sa T1R3in EECs,thus validating their direct involvement in taste-like transduction mechanisms of the fish *** conclusion,data provide new insights in the evolutionary conservation of gut sensing in fish suggesting a conserved role for nutrient sensors modulating entero-endocrine secretion.

关键词： Taste 1 receptor Fish larvae Gut nutrient sensing Gut peptides G(i)alpha protein subunits 1 and 2

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妊娠合并抗磷脂综合征治疗后,Ⅻa因子依赖的纤溶激活受损在孕晚期并发症发生中的作用

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世界核心医学期刊文摘（妇产科学分册） 2006年第8期2卷 21-22页

作者： Carmona F. Lá zaro I. reverter J.C. J. Balasch 吕涛 Institut Clnic of Gynecology and Obstetrics Hospital Clnic c/Casanova 143 08036-Barcelona Spain Dr.

Objective: The objective of the study was to investigate the potential role of impaired factor XII-dependent activation of fibrinolysis in treated antiphospholipid syndrome gestations developing late-pregnancy complications. Study design: This was a prospective study in a third-level teaching hospital, including 75 patients: 25 pregnant patients having the antiphospholipid syndrome and carrying their pregnancies until 26 weeks’ gestation or later (group 1); 25 pregnant patients having normal term pregnancies and delivery and no previous miscarriage (group 2); and 25 pregnant patients being diagnosed as having severe pre- eclampsia and/or intrauterine growth restriction but testing negative for antiphospholipid antibodies (group 3). Hemostatic evaluation was carried out from patients in groups 1 and 2 between 6 and 10 weeks, between 18 and 22 weeks, and between 28 and 32 weeks’ gestation. Patients in group 3 were sampled between 28 and 32 weeks. An additional blood sample was obtained 4 to 6 months after delivery (baseline). The Mann-Whitney U test, the Friedman test, and the χ 2 test were used. Results: Patients in group 1 were characterized by increased factor VIIa levels, increased prothrombin fragment 1+ 2 levels, reduced factor XIIa levels, diminished functional urokinase-type plasminogen activator levels, and decreased levels of plasmin/alpha- 2-plasmin inhibitor complexes. These abnormalities were more evident in patients in group 1 developing pre-eclampsia and/or intrauterine growth restriction. Conclusions: Impaired factor XIIa-dependent activation of fibrinolysis seems to be a key mechanism related to late pregnancy complications in patients with the antiphospholipid syndrome.

关键词：抗磷脂综合征晚期并发症纤溶重度先兆子痫正常分娩教学医院纤维蛋白溶酶流产史基线水平止

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