Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"Egg predation"”.
-
Cheating and Selfishness in Reproductive Interactions among Nest Associative Cyprinids
… reproductive decisions of associates. Most eggs were located in the bottom upstream quarter of nests, and a molecular analysis revealed that stonerollers and chubs constituted the majority of identified individuals. A comparison of host-associate ratios from four nest sections failed to …
-
Impacts of the Invasive White Perch on the Fish Assemblage of Kerr Reservoir, Virginia
… the white perch's impact on them. Striped bass eggs were found in the stomach contents of white perch collected from the Roanoke River during their concurrent spawning runs in May, and at times egg predation was intense (frequency of egg occurrence in white perch individuals up to 100 %). …
-
Cascading Effects Of Predator Removal On The Ecology Of Sea Turtle Nesting Beaches
… summers of 2003 and 2004. Raccoon and ghost crab predation are among the highest causes of egg mortality for sea turtles in Florida and raccoons are intraguild predators of ghost crabs. Because of the damage done to sea turtle nests, raccoons have been removed from some beaches during the sea …
-
Exotic Armored Catfishes in Texas: Reproductive Biology, and Effects of Foraging on Egg Survival of Native Fishes (Etheostoma fonticola, Endangered and Dionda diaboli, Threatened)
… affect native species through dietary overlap, egg predation, and other factors. This study focused on two related topics: 1. the reproductive biology of Hypostomus in the San Marcos River, Texas; and 2. the potential effect of the foraging activities of the exotic on the egg survival of two …
-
Exploring the Evolution and Taxonomy of Evaniidae (Hymenoptera), a Charismatic and Enigmatic Family of Insects
… and frequently collected. The larvae develop as egg predators within the oothecae of cockroaches (Dictyoptera), and the family follows a largely tropical distribution. Despite myriad fascinating biological attributes (mimicry complexes, wing venation heterogeneity, unexplored biogeographical …
-
The effects of wildflower plots and diverse landscapes on ecosystem services, bee communities, and on-farm tick abundance
… systems. We measured pest density, sentinel egg predation, crop damage, seed pollination, biomass production, marketable crop yield, sampled the bee community, and recorded tick abundance in wildflower plots. Many of the measures of biological control and pollination services had …
-
Effects of insecticides on potato leafhoppers Empoasca fabae (Harris) and its predators
… investigated under laboratory conditions. In the predation tests, two studies were conducted, namely, predation on egg stage and predation on nymphal and adult stages of the potato leafhopper. An indirect method of determining egg predation was employed because potato leafhopper eggs are not …
-
Managing Fire Mosaics for Biodiversity
… I demonstrate that background rates of egg predation in forest soils are high and that these costs may be reduced by ovipositing in soils sterilized by the extreme heat of wildfires. Finally, I document pyrophilic dispersal behaviour during an extreme weather event that ignited 17 …
-
Towards a conservation strategy of the Roseate tern Sterna dougallii in the Azores Archipelago
… the archipelago, giving particular attention to predation and potential predators. Data were mainly attained through fieldwork conducted in the period 2002-2004, but investigation of recent historical records of breeding numbers is utilized to assess trends. These historical data were collected …