Peer-reviewed Articles - Biology

Insulin-like growth factor 2 (IGF2) and dopamine receptor 2 (DRD2) play important roles in ovarian follicular development. In this study, we analyzed tissue-specific expression of the Muscovy duck IGF2 and DRD2 genes and cloned those genes transcripts. Polymorphisms...

["Genetics","Zoology"]
doi:10.7717/peerj.4083
70 downloads
1,210 views

Convergent evolution can provide insights into the predictability of, and constraints on, the evolution of biodiversity. One striking example of convergence is seen in the ‘river dolphins’. The four dolphin genera that make up the ‘river dolphins’ (Inia geoffrensis,...

["Evolutionary Studies","Taxonomy","Zoology"]
doi:10.7717/peerj.4090
13 downloads
326 views

Background Laying hens are often kept in barn or free-range systems where they must negotiate level changes in the house to access resources. However, collisions and resultant keel fractures are commonplace. Producers sometimes add ramps to make raised areas more...

["Animal Behavior","Zoology"]
doi:10.7717/peerj.4069
43 downloads
235 views

Morphological differentiation among closely related species provides opportunities to study mechanisms shaping natural phenotypic variation. Here, we address variation in the orientation of melanin-colored body stripes in three cichlid species of the tribe Haplochromini....

["Aquaculture, Fisheries and Fish Science","Biodiversity","Evolutionary Studies","Molecular Biology","Zoology"]
doi:10.7717/peerj.4080
45 downloads
1,270 views

Hörnig, Haug & Haug (2017) published a description of a new specimen of Santanmantis axelrodi MB.I.2068, an extinct species of praying mantis from the Crato Formation of Brazil. According to Hörnig, Haug & Haug (2017), the discovery of this new specimen brought...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7717/peerj.4046
29 downloads
142 views

Background Animal growth is often constrained by unfavourable conditions and divergences from optimal body size can be detrimental to an individual’s fitness, particularly in species with determinate growth and a narrow time-frame for life-time reproduction. Growth...

["Animal Behavior","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.4050
32 downloads
281 views

The Mexican Garter Snake (Thamnophis eques) is a terrestrial-aquatic generalist that feeds on both aquatic and terrestrial prey. We describe size-related variation and sexual variation in the diet of T. eques through analysis of 262 samples of identifiable stomach...

["Conservation Biology","Ecology","Zoology"]
doi:10.7717/peerj.4036
84 downloads
421 views

The IUCN Red List of Threatened Species is often advocated as a tool to assist decision-making in conservation investment and research focus. It is frequently suggested that research efforts should prioritize species in higher threat categories and those that are...

["Biodiversity","Conservation Biology","Zoology"]
doi:10.7717/peerj.4025
111 downloads
903 views

The arthropodium is the key innovation of arthropods. Its various modifications are the outcome of multiple evolutionary transformations, and the foundation of nearly endless functional possibilities. In contrast to hexapods, crustaceans, and even chelicerates,...

["Animal Behavior","Biodiversity","Entomology","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.4023
53 downloads
549 views

As technology has improved, our ability to study cryptic animal behavior has increased. Bed site selection is one such example. Among prey species, bed site selection provides thermoregulatory benefits and mitigates predation risk, and may directly influence survival....

["Animal Behavior","Ecology","Zoology"]
doi:10.7717/peerj.4010
87 downloads
1,235 views

Camouflage, and in particular background-matching, is one of the most common anti-predator strategies observed in nature. Animals can improve their match to the colour/pattern of their surroundings through background selection, and/or by plastic colour change....

["Animal Behavior","Ecology","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.3999
78 downloads
478 views

Dispersal forms are an important component of the ecology of many animals, and reach particular importance for predicting ranges of invasive species. African clawed frogs (Xenopus laevis) move overland between water bodies, but all empirical studies are from invasive...

["Animal Behavior","Zoology","Freshwater Biology"]
doi:10.7717/peerj.4039
39 downloads
315 views

Anthropogenic water sources (AWS) are developed water sources used as a management tool for desert wildlife species. Studies documenting the effects of AWS are often focused on game species; whereas, the effects on non-target wildlife are less understood. We used...

["Conservation Biology","Ecology","Zoology","Natural Resource Management"]
doi:10.7717/peerj.4003
48 downloads
903 views

The distinctive and divergent courtship phenotypes of the birds-of-paradise make them an important group for gaining insights into the evolution of sexually selected phenotypic evolution. The genus Astrapia includes five long-tailed species that inhabit New Guinea’s...

["Animal Behavior","Biodiversity","Zoology"]
doi:10.7717/peerj.3987
73 downloads
517 views

The Pantanal is one of the world’s largest tropical wetland areas and harbors high mammal biomass. There is no formal list of dung beetle species, and studies on their functional roles have never being carried out in Pantanal. In this study, we identified dung...

["Biodiversity","Ecology","Entomology","Zoology"]
doi:10.7717/peerj.3978

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