In socially monogamous species, males that risk cuckoldry more than others might gain inclusive fitness by yielding paternity to relatives. We tested this prediction in the Tibetan ground tit Pseudopodoces humilis, an unusual facultative cooperative breeder wherein most helpers (87% males) join a mated pair shortly before clutch completion. Extra-pair paternity among bi-parental broods occurred...

Dieback in temperate forests is understudied, despite this biome predicted to be increasingly affected by more extreme climate events a warmer world. To evaluate the potential drivers of dieback we reconstructed changes radial growth and intrinsic water-use efficiency (iWUE) from stable isotopes tree rings. Particularly, compared size, radial-growth trends, responses (temperature, precipitation...

Evidence was presented in a previous paper' that a hybrid substance, encountered after an antigenic character (ch4) of Streptopelia chinensis was transferred to S. risoria, resulted from the interaction of nonallelic genes. Specifically, the cha4 cellular antigen from chinensis showed no hybrid substance when present in backcross individuals that were homozygous for an independently inherited c...

Background In the Romanian flora, several species of the Betula genus are present, especially European white birch (B. pendula, syn. B. verrucosa) and downy birch (B. pubescens, syn. B. alba). Rare species are B. nana and B. humilis. In Southern Romania, the sensitization to Betulaceae pollen in patients with allergic rhinitis is less frequent than that to Poaceae pollen. The flowering season o...

INTRODUCTION. ........ .............................. ......................... 311 The types used.. ................................................................. 311 The work of the early hybridizers Experimental work.. ............ .............................. The parental strains and their beha;ior ............................ Nicotiana rustica humililis crossed with Nicotiana panicula...

Taxonomic uncertainties and the lack of ecological knowledge can hinder correct identification assignment biogeographic status marine species. The ascidian Asterocarpa humilis (Heller, 1878), originally described from New Zealand, has a broad distribution in shallow temperate areas Southern Hemisphere, having recently colonised Northern Hemisphere. A closely related species, Cnemidocarpa robins...