Differences in predation intensity experienced by organisms can lead to divergent natural selection, driving evolutionary change. Western mosquitofish (Gambusia affinis) exhibit larger caudal regions and higher burst-swimming capabilities when coexisting with higher densities of predatory fish. It is hypothesized that a trade-off between steady (constant-speed cruising; important for acquiring ...

A greater knowledge of the morphology and the development of the infective third larval stage of Neoaplectana bibionis Bovien, 1937, a parasite of arthropods, makes it possible to recognise the second larval stage and present a description of all the developmental stages in the life cycle of the species. Four larval stages can be recognised. L1 hatches from the egg. In a suitable host, when the...

Saline to freshwater invasions have become increasingly common in recent years. A key hypothesis is that rates of freshwater invasions have been amplified in recent years by increased food concentration, yet this hypothesis has remained unexplored. We examined whether elevated food concentration could enhance freshwater tolerance, and whether this effect evolves following saline to freshwater i...

The Cuban fauna of the genus Berosus Leach, 1817 is reviewed based on newly collected material as well as historical and type specimens. Nine species are recognized, including three recorded from Cuba for the first time: Berosus infuscatus LeConte, 1855, Berosus interstitialis Knisch, 1924 (= Berosus stribalus Orchymont, 1946 syn. n.) and Berosus metalliceps Sharp, 1882. Only one of the nine Cu...

In this study, we document the first recorded range extension of genus Synaphobranchus from East Mariana Basin in Western Pacific Ocean. We sequenced complete mitochondrial (mt) genome two deep-sea eels (Synaphobranchus brevidorsalis and S. affinis) collected The mt genomes affinis were 16,686 bp 16,677 length, respectively, consisted 13 protein-coding genes, 22 tRNA rRNA genes. Molecular phylo...

Several species and developmental stages of calanoid copepods were tested for responses to environmental cues in a laboratory apparatus that mimicked conditions commonly associated with patches of food in the ocean. All species responded to the presence of phytoplankton by feeding. All species responded by increasing proportional residence time in one, but not both, of the treatments defined by...

KEMAL ALI GER 1, PATRICIA ARNESON 1, CHARLES REMINGTON GOLDMAN 1 AND SWEE JOO TEH 2* 1 DEPARTMENT OF ENVIRONMENTAL SCIENCE AND POLICY, UNIVERSITY OF CALIFORNIA, DAVIS, CA 95616, USA AND AQUATIC TOXICOLOGY PROGRAM, DEPARTMENT OF ANATOMY, PHYSIOLOGY, AND CELL BIOLOGY, SCHOOL OF VETERINARY MEDICINE, DEPARTMENT OF ANATOMY, PHYSIOLOGY AND CELL BIOLOGY, UNIVERSITY OF CALIFORNIA, 1321 HARING HALL, ONE...

Ecological invasions, where non-native species spread to new areas, grow to high densities and have large, negative impacts on ecological communities, are a major worldwide problem. Recent studies suggest that one of the key mechanisms influencing invasion dynamics is personality-dependent dispersal: the tendency for dispersers to have a different personality type than the average from a source...

Technological and analytical advances to study evolutionary biology, ecology, conservation of the Southern River Terrapin (Batagur affinis ssp.) are realised through molecular approaches, including DNA barcoding. We evaluated use COI barcodes in Malaysia’s population better understand species’ genetic divergence other characteristics. 26 sequences, four from field specimens Terrapins obtained B...

A critical review of the family Veliidae (Hemiptera: Heteroptera: Gerromorpha) in Romania is provided. In total, two genera and eight species (Microvelia Westwood, 1834-3 species, Velia Latreille, 1804-5 species) are known from the country. Microvelia buenoi Drake, 1920 and Velia serbica Tamanini, 1951 are recorded for the first time from Romania. The occurrence of V. affinis filippii Tamanini,...