Many studies have documented long-term changes in adult marine fish distributions and linked these changes to climate change and multi-decadal climate variability. Most marine fish, however, have complex life histories with morphologically distinct stages, which use different habitats. Shifts in distribution of one stage may affect the connectivity between life stages and thereby impact populat...

Previous descriptions of larval philometrids and camallanids are based on observation from light microscopy. First-stage larvae of Camallanus oxycephalus, Philometra cylindracea, and Philometra sp. were examined by electron microscopy to determine whether differences seen in adult structure also occur in the larvae, allowing for identification of larval stages in the intermediate and definitive...

Symbiodinium are dinoflagellate photosynthetic algae that associate with a diverse array of marine invertebrates, and these relationships are comprehensively documented for adult animal hosts. Conversely, comparatively little is known about the associations during larval development of animal hosts, although four different metazoan phyla (Porifera, Cnidaria, Acoelomorpha, and Mollusca) produce ...

background: infection with ornithobilharzia turkestanicum has been reported in a wide ran ge of animals worldwide. this study was undertaken to assess the util-ity of polymerase chain reaction (pcr), for detecting the infection with o . turke-stanicum larvae stages in lymnaea gedrosiana . methods: a total of 6,759 lymnaeidae snails were collected from six aquatic habitats in west azarbaijan, no...

Urban development is the most common form of land conversion in the United States. Using a before-after control-impact study design, we investigated the effects of urbanization on larval and adult stages of southern two-lined salamanders (Eurycea cirrigera) and northern dusky salamanders (Desmognathus fuscus). Over 5 years, we estimated changes in occupancy and probabilities of colonization and...

the diamondback moth, plutella xylostella (linnaeus, 1758) (lep.: plutellidae) is the most destructive insect pest of crucifer plants throughout the world. in order to study its seasonal population fluctuation, sampling was conducted in the cauliflower fields of south of tehran from late may until october 2011. one hectare cauliflower field in the middle of a large field was randomly selected i...