Temperature-induced sex reversal is not responsible for sex-ratio distortions in grayling Thymallus thymallus or brown trout Salmo trutta.

On the basis of the experiments carried out over various years, it was concluded that (1) grayling Thymallus thymallus and brown trout Salmo trutta are resistant to temperature-induced sex reversal at ecologically relevant temperatures, (2) environmental sex reversal is unlikely to cause the persistent sex ratio distortion observed in at least one of the study populations and (3) sex-specific tolerance of temperature-related stress may be the cause of distorted sex ratios in populations of T. thymallus or S. trutta.

Persistent unequal sex ratio in a population of grayling (salmonidae) and possible role of temperature increase.

In some fishes, water chemistry or temperature affects sex determination or creates sex-specific selection pressures. The resulting population sex ratios are hard to predict from laboratory studies if the environmental triggers interact with other factors, whereas in field studies, singular observations of unusual sex ratios may be particularly prone to selective reporting. Long-term monitoring largely avoids these problems. We studied a population of grayling (Thymallus thymallus) in Lake Thun, Switzerland, that has been monitored since 1948. Samples of spawning fish have been caught about 3 times/week around spawning season, and water temperature at the spawning site has been continuously recorded since 1970. We used scale samples collected in different years to determine the average age of spawners (for life-stage specific analyses) and to identify the cohort born in 2003 (an extraordinarily warm year). Recent tissue samples were genotyped on microsatellite markers to test for genetic bottlenecks in the past and to estimate the genetically effective population size (N(e) ). Operational sex ratios changed from approximately 65% males before 1993 to approximately 85% males from 1993 to 2011. Sex ratios correlated with the water temperatures the fish experienced in their first year of life. Sex ratios were best explained by the average temperature juvenile fish experienced during their first summer. Grayling abundance is declining, but we found no evidence of a strong genetic bottleneck that would explain the apparent lack of evolutionary response to the unequal sex ratio. Results of other studies show no evidence of endocrine disruptors in the study area. Our findings suggest temperature affects population sex ratio and thereby contributes to population decline. Persistencia de Proporción de Sexos Desigual en una Población de Tímalos (Salmonidae) y el Posible Papel del Incremento de la Temperatura.

Sex- and melanism-specific variations in the oxidative status of adult tawny owls in response to manipulated reproductive effort.

Oxidative stress, determined by the balance between the production of damaging reactive oxygen species (ROS) and antioxidant defences, is hypothesized to play an important role in shaping the cost of reproduction and life history trade-offs. To test this hypothesis, we manipulated reproductive effort in 94 breeding pairs of tawny owls (Strix aluco) to investigate the sex- and melanism-specific effects on markers of oxidative stress in red blood cells (RBCs). This colour polymorphic bird species shows sex-specific division of labour and melanism-specific history strategies. Brood sizes at hatching were experimentally enlarged or reduced to increase or decrease reproductive effort, respectively. We obtained an integrative measure of the oxidative balance by measuring ROS production by RBCs, intracellular antioxidant glutathione levels and membrane resistance to ROS. We found that light melanic males (the sex undertaking offspring food provisioning) produced more ROS than darker conspecifics, but only when rearing an enlarged brood. In both sexes, light melanic individuals had also a larger pool of intracellular antioxidant glutathione than darker owls under relaxed reproductive conditions (i.e. reduced brood), but not when investing substantial effort in current reproduction (enlarged brood). Finally, resistance to oxidative stress was differently affected by the brood size manipulation experiment in males and females independently of their plumage coloration. Altogether, our results support the hypothesis that reproductive effort can alter the oxidative balance in a sex- and colour-specific way. This further emphasizes the close link between melanin-based coloration and life history strategies.

historiae ecclesiasticae gentis Anglorum libri quinque : authore Beda, Presbytero ; praemittitur epitaphium discipulorum sex sancti Gregorii, Papae.

Colbertinus

historiae Longobardorum libri sex : initio et ad calcem occurrunt folia aliquot loco suo mota ; authoris nomen non comparet, is autem est Paulus Diaconus.

Faurianus

1.° Petri Pauli Vergerii, Justinopolitani, liber de politia Venetorum, eorumque legibus ac moribus, urbis situ, naturaque regionis. — 2.° Ejusdem liber de situ veteris Romae. — 3.° Anonymi chronica Italica. — 4.° Historiae ecclesiasticae omnium temporum libri sex : authore anonymo. — 5.° Sexti Rufi, viri Consularis, historiae Romanae breviarium. — 6.° Benevenuti de Rambaldis, Imolensis, liber augustalis de vitis Caesarum.

Faurianus

sancti Gregorii Turonensis historiae Francorum libri novem : primus liber integer, secundi sex priora capitula et alia passim desiderantur : ad calcem libri noni subjicitur Fredegarii chronicon ab anno quo desierat Gregorius, deductum ad annum 656. quod quidem à variis authoribus productum fuit ad annum 741. porrò chronicon Fredegarii cum additamentis, decimus Gregorii Turonensis liber in hoc codice inscribitur.

Colbertinus

rerum Sicanicarum libri sex : authore Francisco Maurolyco, Abbate Messanensi ; exemplar autographum.

Colbertinus

1.° L. Annaei Senecae libri duo de clementia, ad Neronem. — 2.° Ejusdem epistolarum libri viginti duo. — 3.° Ejusdem liber de remediis fortuitorum, ad Gallionem. — 4.° Ejusdem liber de septem liberalibus artibus. — 5.° Ejusdem, sive potiùs, Martini Dumiensis liber de quatuor virtutibus. — 6.° Declamationum libri decem. — 7.° L. Annaei Senecae libri sex de quaestionibus naturalibus. — 8.° Proverbia, sive Senecae, Publii Syri et aliorum sententiae. — 9.° Liber de moribus. — 10.° Senecae de beneficiis libri septem. — 11.° Ejusdem libri duo de providentia. — 12.° Ejusdem liber de beata vita, ad Gallionem. — 13.° Ejusdem liber de tranquillitate animi, ad Serenum. — 14.° Ejusdem liber de brevitate vitae, ad Paulinum. — 15.° Ejusdem de ira libri tres, ad Novatum. — 16.° Ejusdem liber de consolatione ad Martiam. — 17.° Ejusdem liber de consolatione ad Helviam matrem. — 18.° Pauli et Senecae epistolae mutuae supposititiae.

Colbertinus, antea Jacobi Augusti Thuani

1.° L. Annaei Senecae de quaestionibus naturalibus libri septem. — 2.° Fragmentum Adelardi, Bathensis, de quibusdam quaestionibus naturalibus. — 3.° Collatio Alexandri Magni et Dyndimi, Regis Brachmannorum, de philosophia, facta per litteras. — 4.° Senecae libri septem de beneficiis. — 5.° Ejusdem, sive potiùs, Martini Dumiensis liber de quatuor virtutibus. — 6.° Senecae liber de remediis fortuitorum. — 7.° Liber de verborum copia, qui Senecae tribuitur. — 8.° Ejusdem de clementia libri duo. — 9.° Pauli et Senecae epistolae mutuae supposititiae. — 10.° Senecae, Publii Syri et aliorum sententiae. — 11.° Senecae epistolae ad Lucilium centum viginti et sex.

Colbertinus, antea Jacobi Augusti Thuani

Alberti Magni tractatus de animalibus ; sex et viginti libris.

Colbertinus

1.° Anonymi mythologicon. — 2.° Summa poenitentiae, sex libris : authore anonymo. — Hujusce codicis pars decimo tertio, pars undecimo saeculo videtur exarata.

Ludovici de Targny

1.° Aristotelis categoriae : praemittitur Porphyrii isagoge. — 2.° Aristotelis libri duo de interpretatione, à Boëtio latinè versi. — 3.° Boëtii de differentiis topicis libri quatuor. — 4.° Liber sex principiorum : authore Gilberto Porretano. — 5.° Boëtii liber de divisione. — 6.° Aristotelis analytica priora et posteriora : Boëtio interprete. — 7.° Aristotelis topicorum libri octo : interprete Boëtio. — 8.° Aristotelis elenchorum sophisticorum libri duo : Boëtio interprete.

Colbertinus

historiae Longobardorum libri sex : authore Paulo Diacono ; primi libri initium desideratur.

Puteanus