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zoology
2 downloads

Torsional loading is a common feature of skeletal biomechanics during vertebrate flight. The importance of resisting torsional loads is best illustrated by the convergence of wing bone structure (e.g., long with thin walls) across extant bats and birds. Whether...

["Zoology","Anatomy and Physiology","Histology"]
doi:10.7717/peerj.823
90 downloads
287 views

In August 2013, we observed a high incidence (44%) of synchronous bands of reduced melanin (a type of fault bar we have termed “pallid bands”) across the rectrices of juvenile Grasshopper Sparrows (Ammodrammus savannarum) captured near El Reno, Oklahoma. Earlier...

["Conservation Biology","Ecology","Zoology"]
doi:10.7717/peerj.814
19 downloads
76 views

Rapid morphological change has been shown in rodent populations on islands, including endemic deer mice (Peromyscus maniculatus subspp.) on the California Channel Islands. Surprisingly, most of these changes were towards a smaller size. Black rats were introduced...

["Biodiversity","Conservation Biology","Ecology","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.812
98 downloads
483 views

Marsupials or metatherians are a group of mammals that are distinct in giving birth to young at early stages of development and in having a prolonged investment in lactation. The group consists of nearly 350 extant species, including kangaroos, koala, possums,...

["Biodiversity","Biogeography","Evolutionary Studies","Taxonomy","Zoology"]
doi:10.7717/peerj.805
49 downloads
125 views

The taxon Beloniformes represents a heterogeneous group of teleost fishes that show an extraordinary diversity of jaw morphology. I present new anatomical descriptions of the jaw musculature in six selected beloniforms and four closely related species. A reduction...

["Taxonomy","Zoology"]
doi:10.7717/peerj.769
87 downloads
209 views

The Permo-Triassic archosauromorph record is crucial to understand the impact of the Permo-Triassic mass extinction on the early evolution of the group and its subsequent dominance in Mesozoic terrestrial ecosystems. However, the Permo-Triassic archosauromorph...

["Biogeography","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.776
35 downloads
108 views

This paper describes the weight–length relationships (WLRs) and Fulton’s condition factors (K) of skipjack tuna (Katsuwonus pelamis) in purse seine fisheries from three cruises in the western and central Pacific Ocean (WCPO): August–September 2009 (AS09), November–December...

["Aquaculture, Fisheries and Fish Science","Marine Biology","Zoology"]
doi:10.7717/peerj.758
54 downloads
199 views

The mature spermatozoa of Stephanostomum murielae and Stephanostomoides tenuis are described by transmission electron microscopy. They present several ultrastructural features previously reported in other digeneans. Their spermatozoa possess two axonemes of different...

["Cell Biology","Parasitology","Taxonomy","Zoology"]
doi:10.7717/peerj.744
56 downloads
225 views

Crustacean intersexuality is widespread and often linked to infection by sex-distorting parasites. However, unlike vertebrate intersexuality, its association with sexual dysfunction is unclear and remains a matter of debate. The ‘Demon Shrimp,’ Dikerogammarus haemobaphes,...

["Ecology","Parasitology","Zoology"]
doi:10.7717/peerj.757
87 downloads
144 views

Dominance hierarchy influences the life quality of social animals, and its definition should in principle be based on the outcome of agonistic interactions. However, defining and comparing the dominance profile of social groups is difficult due to the different...

["Animal Behavior","Anthropology","Zoology"]
doi:10.7717/peerj.729
1,428 downloads
47,200 views

What are the greatest sizes that the largest marine megafauna obtain? This is a simple question with a difficult and complex answer. Many of the largest-sized species occur in the world’s oceans. For many of these, rarity, remoteness, and quite simply the logistics...

["Biodiversity","Ecology","Evolutionary Studies","Marine Biology","Zoology"]
doi:10.7717/peerj.715
122 downloads
206 views

The three-dimensional anatomy of the ostrich (Struthio camelus) knee (femorotibial, femorofibular, and femoropatellar) joint has scarcely been studied, and could elucidate certain mechanobiological properties of sesamoid bones. The adult ostrich is unique in that...

["Evolutionary Studies","Zoology","Anatomy and Physiology","Radiology and Medical Imaging"]
doi:10.7717/peerj.706
90 downloads
201 views

Opisthobranch molluscs exhibit fascinating body plans associated with the evolution of shell loss in multiple lineages. Sea hares in particular are interesting because Aplysia californica is a well-studied model organism that offers a large suite of genetic tools....

["Aquaculture, Fisheries and Fish Science","Biodiversity","Developmental Biology","Marine Biology","Zoology"]
doi:10.7717/peerj.700
89 downloads
493 views

A number of polymerase chain reaction (PCR) inhibitors have been identified from biological and environmental samples. By and large, such substances are treated as random nuisances and contaminants with alternate functions; their inhibitory effects on DNA replication...

["Marine Biology","Molecular Biology","Zoology"]
doi:10.7717/peerj.689
183 downloads
149 views

Neuropathogenesis is a feature of Neospora caninum infection. In order to explore this in the absence of acquired host immunity to the parasite, we have tested infection in locusts (Schistocerca gregaria). We show for the first time that locusts are permissive...

["Entomology","Evolutionary Studies","Parasitology","Zoology","Infectious Diseases"]
doi:10.7717/peerj.674

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