Interest in mariculture of the lion's paw scallop, Nodipecten subnodosus, is increasing due to overexploitation wild populations Mexico and species' high market demand. Four larval three postlarval trials N. subnodosus were carried out using batch- or flow-through culture 500-L tanks laboratory test variability methodology terms percent survival (S) growth. Temporal changes weight energy substr...

The selective pressures leading to the evolution of Sexual Size Dimorphism (SSD) have been well studied in many organisms, yet, the underlying developmental mechanisms are poorly understood. By generating a complete growth profile by sex in Drosophila melanogaster, we describe the sex-specific pattern of growth responsible for SSD. Growth rate and critical size for pupariation significantly con...

Third instar growth and survival, and the effect of larval density of the Japanese beetle, Popillia japonica Newman and the southern masked chafer, Cyclocephala lurida (Olivier) were evaluated on Tifway bermudagrass, Cynodon dactyl on (L.) and KY-31 tall fescue, Festuca arundinacea Schreb. in a threeyear field study. Winter survival was sometimes enhanced in bermudagrass plots. Larval weight ga...

The effects of mercury (Hg) concentrations ranging from 0 (control) to 1024 pg 1-' upon embryogenesis, survival, growth and metamorphosis of Crassostrea gigas (Thunberg) oyster larvae were investigated. Embryogenesis was abnormal in 50 % of the individuals at 11 pg I ' The 48 h LDS" for D-shaped, urnbonate and pediveliger larvae were 33, 115 and 200 pg 1-' respectively. The increase in was part...

The potential capacity of larval growth and immune response traits of the autumnal moth to adapt to heavy metal polluted environment was tested experimentally. Both the relative growth rate (RGR) and pupal weight were significantly higher in control trees than on polluted trees, indicating that metal pollution prevented the insect from achieving maximal growth on birch leaves. Larval growth rat...

Four sunflower accessions were compared with a susceptible check, hybrid '894', in the greenhouse to determine their resistance to the banded sunflower moth, Cochylis hospes Walsingham, and their interaction with Bacillus thuringiensis Berliner variety kurstaki. Antibiosis, expressed as lower larval weight, was detected in all of the accessions. In addition to being antibiotic, sunflower access...

Three size classes of Capitella capitata (Type I ) were fed 4 size ranges of detritus particles derived from red seaweed Gracilaria foliifera. Growth was generally reduced when only the largest particle-size range (150 to 250 pm) was available, and the effect was most pronounced for small worms. Worms lost weight when fed fecal pellets comparable in size to the largest particles of seaweed detr...

Digestive enzymatic activity and nutritional responses of Autographa gamma (L.) (Lepidoptera: Noctuidae), an important insect pest of sugar beet, on nine sugar beet cultivars (Peritra, Karolina, Paolita, Lenzier, Tiller, Ardabili, Persia, Rozier, and Dorothea) were studied. The highest proteolytic activity of fourth and fifth instar of A. gamma was in larvae fed on cultivar Persia. The highest ...

Several plant extracts were evaluated against obliquebanded leafroller larvae to determine potential toxicity and antifeedant effects. Two of the plant extracts exhibited contact toxicity; the LC50 value of Humulus lupulus extract against 3 rd instar larvae was 24.5 μg / insect. In a no choice context, larval survivorship was reduced 23 57 % after feeding on a meridic pinto bean diet treated wi...