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Now showing items 71-80 of 80
A new Early Oligocene toothed ‘baleen’ whale from western North America
(2015)
Archaic toothed mysticetes represent the evolutionary transition from raptorial to bulk filter feeding in baleen whales. Aetiocetids, in particular, preserve an intermediate morphological stage in which teeth functioned ...
A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals
(2015)
Recent studies have reported multiple cases of molecular adaptation in cetaceans related to their aquatic abilities. However, none of these has included the hippopotamus, precluding an understanding of whether molecular ...
Phylogenetic tests reject Emery’s rule in the evolution of social parasitism in yellowjackets and hornets
(2015)
Social parasites exploit the brood-care behaviour and social structure of one or more host species. Within the social Hymenoptera there are different types of social parasitism. In its extreme form, species of obligate ...
Unexpected monophyletic origin of Ephoron shigae unisexual reproduction strains and their rapid expansion across Japan
(2015)
The burrowing polymitarcyid mayflyEphoron shigaeis distri-buted across Japan, Korea, northeast China and far east Russia. Some populations are bisexual, and others are unisexual, i.e. geographically parthenogenetic throughout ...
Reduced entomopathogen abundance in Myrmicaant nests
(2015)
Social insects such as ants have evolved collective rather than individual immune defence strategies against diseases and parasites at the level of their societies (colonies), known as social immunity. Ants frequently host ...
The relationship between pond habitat depth and functional tadpole diversity in an agricultural landscape
(2015)
One of the most important goals of biodiversity studies is to identify which characteristics of local habitats act as filters that determine the diversity of functional traits along environmental gradients. In this study, ...
Models of fertilization kinetics
(2015)
Fertilization functions describe how the number of realized fertilizations depends on gamete numbers or density. They provide insight into the fertilization process, and are important components in models on the evolution ...
Coexistence of three sympatric cormorants
(2016)
Resource partitioning is well known along food and habitat for reducing competition among sympatric species, yet a study on temporal partitioning as a viable basis for reducing resource competition is not empirically ...
Evolutionary origins and development of saw-teeth on the sawfish and sawshark rostrum
(2015)
A well-known characteristic of chondrichthyans (e.g. sharks, rays) is their covering of external skin denticles (placoid scales), but less well understood is the wide morphological diversity that these skin denticles can ...
The cervical anatomy of Samotherium,an intermediate-necked giraffid
(2015)
Giraffidae are represented by many extinct species. The only two extant taxa possess diametrically contrasting cervical morphology, as the okapi is short-necked and the giraffe is exceptionally long-necked.Samotherium ...