The ultrastructure of spermatozoa in three species of cambarid crayfish, Cambarus robustus, Orconectes propinquus, and Orconectes rusticus, were studied and compared with eight previously studied species from different crayfish families using morphological features...

["Biodiversity","Zoology"]
doi:10.7717/peerj.2363

Anemones of genus Exaiptasia are used as model organisms for the study of cnidarian-dinoflagellate (genus Symbiodinium) endosymbiosis. However, while most reef-building corals harbor Symbiodinium of clade C, Exaiptasia spp. anemones mainly harbor clade B Symbiodinium...

["Marine Biology","Zoology"]
doi:10.7717/peerj.2358

Background. The primarily Neotropical distribution of living alligatoroids raises questions as to when and how the ancestors of Alligator sinensis migrated to China. As phylogeny provides a necessary framework for historical biogeographic issues, determining the...

["Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.2356

Zebrafish (Danio rerio) have emerged as a popular model for studying the pharmacology and behavior of anxiety. While there have been numerous studies documenting the anxiolytic and anxiogenic effects of common drugs in zebrafish, many do not report or test for...

["Animal Behavior","Zoology","Pharmacology"]
doi:10.7717/peerj.2352
39 views

Longitudinal studies focusing on lifetime reproductive success (LRS) have been used to measure individual breeding performance and identify commonalities among successful breeders. By extending the focus to subsequent generations we identify a proportion of high-quality...

["Conservation Biology","Ecology","Marine Biology","Zoology"]
doi:10.7287/peerj.preprints.2386v1
8 downloads
97 views

Throughout much of North America’s boreal forest, the cyclical fluctuations of snowshoe hare populations (Lepus americanus) may cause other herbivores to become entrained in similar cycles. Alternating apparent competition via prey switching followed by positive...

["Conservation Biology","Ecology","Zoology"]
doi:10.7717/peerj.2303
15 downloads
105 views

Coastal birds are critical ecosystem constituents on sandy shores, yet are threatened by depressed reproductive success resulting from direct and indirect anthropogenic and natural pressures. Few studies examine clutch fate across the wide range of environments...

["Animal Behavior","Conservation Biology","Ecology","Zoology"]
doi:10.7287/peerj.preprints.2370v1
328 downloads
871 views

Background The Hajar Mountains of Oman and the United Arab Emirates (UAE) is the highest mountain range in Eastern Arabia. As a result of their old geological origin, geographical isolation, complex topography and local climate, these mountains provide an important...

["Biodiversity","Biogeography","Evolutionary Studies","Taxonomy","Zoology"]
doi:10.7717/peerj.2371
45 downloads
264 views

Knowledge of the effect of habitat type and region on diet and feeding behaviours of a species facilitates a better understanding of factors impacting populations, which contributes to effective conservation management. Using spraint analysis and relative frequency...

["Animal Behavior","Biodiversity","Biogeography","Conservation Biology","Zoology"]
doi:10.7717/peerj.2266
10 downloads
100 views

Background. Organism biomass is one of the most important variables in ecological studies, making estimations of organism weight one of the most common laboratory tasks. Biomass of small macroinvertebrates is usually estimated as dry (DW) or ash-free dry weight...

["Aquaculture, Fisheries and Fish Science","Biodiversity","Ecology","Marine Biology","Zoology"]
doi:10.7287/peerj.preprints.2368v1
7 downloads
57 views

Background. Now-a-day territory of Western Siberia has the poorest diversity of amphibians and reptiles within the Palaearctic Realm, influenced by unfavourable climate. Less is known about the origin and emergence of it. Aside from better-explored European Neogene...

["Biodiversity","Biogeography","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.2365v1
264 downloads
2,565 views

The diversification of crown cetacean lineages (i.e., crown Odontoceti and crown Mysticeti) occurred throughout the Oligocene, but it remains an ongoing challenge to resolve the phylogenetic pattern of their origins, especially with respect to stem lineages. One...

["Ecology","Evolutionary Studies","Marine Biology","Paleontology","Zoology"]
doi:10.7717/peerj.2321
260 downloads
2,998 views

The “scaly-tailed squirrels” of the rodent family Anomaluridae have a long evolutionary history in Africa, and are now represented by two gliding genera (Anomalurus and Idiurus) and a rare and obscure genus (Zenkerella) that has never been observed alive by mammalogists....

["Evolutionary Studies","Genetics","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.2320
48 downloads
263 views

As the most widely distributed snake in Eurasia, the adder (Vipera berus) has been extensively investigated in Europe but poorly understood in Asia. The Southern Altay Mountains represent the adder’s southern distribution limit in Central Asia, whereas its population...

["Biodiversity","Ecology","Taxonomy","Zoology"]
doi:10.7717/peerj.2342
112 downloads
386 views

The study of material collected during routine monitoring surveys dealing with oil extraction and aquaculture in waters off Myanmar (North Andaman Sea) and in the Gulf of Thailand, respectively, allowed us to analyse the taxonomy and diversity of the polychaete...

["Biodiversity","Marine Biology","Taxonomy","Zoology"]
doi:10.7717/peerj.2313

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