Predation Risk Influences Adaptive Morphological Variation in Fish Populations

Predation risk influences adaptive morphological variation in fish populations.

Predators can cause a shift in both density and frequency of a prey phenotype that may lead to phenotypic divergence through natural selection. What is less investigated is that predators have a variety of indirect effects on prey that could potentially have large evolutionary responses. We conducted a pond experiment to test whether differences in predation risk in different habitats caused sh...

Habitat effects on morphological variation of Garra rufa (Heckel, 1843) populations in Iran

Understanding the processes involved in evolution of organisms is a principal topic that has received much attention from the research community. A common way to achieve this is to study the ecological conditions and morphological relationships of taxa. Fish are widely regarded as notable animal models in studies of environmental influence on morphological features given their high environmenta...

Morphological Variation among 23 Xiphinema americanum Populations.

Morphometrics of 23 United States populations of Xiphinema americanum sensu lato, sharing the characteristics of an offset lip region and conoid tail, were examined and analyzed statistically by canonical discriminant analysis (CDA). Specimens were collected from Arkansas, Georgia, Tennessee, Mississippi, Florida, Oklahoma, California, and North Dakota. Eleven measurements and body ratios obtai...

Variation and Relationships of Shoot Yield, Morphological and Phenological Traits in Chamomile Populations (Anthemis triumfettii)

The chamomile species of Anthemis triumfettii (L.) All is one of important medicinal plant belong to Compositae family and it grows as wild species in Zagros and Alborz Mountains, Iran. The aim of this study was to evaluation of morphological and phenological traits and their relationships with essential oil. Seeds of seven accessions were sown in jiffy pots and transferred to field using rando...

Adaptive Management of Fish and Wildlife Populations