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.
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Showing 1 to 20 of 108 for “"reproductive output"”.
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Effects of male breeding gland in hymenochirus on female reproductive output
… thesis shows the pheromones also stimulate the reproductive system of conspecific females. Females exposed to normal males prior to mating then allowed to mate with the normal males released a higher number of eggs than females who were not exposed to normal males prior to mating. Microscopic …
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Factors limiting piping plover nesting pair density and reproductive output on Long Island, New York
… limiting piping plover nesting pair density and reproductive output on Atlantic Barrier Islands, 2001-2004, including one site that had been breached by a storm in 1992, and subsequently repaired and renourished by the U.S. Army Corps of Engineers. We also investigated the short-term impact of …
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Regional Variation in Migratory Behavior and Reproductive Output of The Gulf Of Mexico Blue Crab Spawning Stock
<p>The overarching goal of this research was to better understand the structure and boundaries of the blue crab stock(s) in the Gulf of Mexico, focusing on large-scale movements of spawning female crabs. Because spawning location is a primary determinant of larval transport pathways, understanding …
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Changing Fecundity and Reproductive Output in Females of a Chesapeake Bay Population of Blue Crab, <i>Callinectes sapidus</i>
… shifts in maternal effort, and potentially reproductive success, both inter-annually and seasonally. Fluctuations in energy available to an embryo, as well as the production of fewer embryos have significantly lowered the reproductive output of this population.</p>
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Marine Reserves Promote Coral Reef Resilience by Mitigating Human Impacts Through the Restoration of Parrotfish Populations, Increasing Their Reproductive Output and Seeding Neighboring Overfished Reefs
… analyses, determined shifts in sizes of reproductive female parrotfishes and how this restores reproductive output and utilized genetic techniques in detecting migration patterns. Results revealed that marine reserves were able to prevent the proliferation of algae and loss of coral in …
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Does the implementation of a closed fishing season during the breeding season benefit a species? : a per-recruit-based approach using Cymbula granatina as an illustration
… on the presumption that they increase reproductive output of fished populations. This is based on the assumption that the imposition of a closed season during the breeding season allows more individuals to reproduce, as they are not being harvested. I evaluated the validity of imposing …
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Does the implementation of a closed Fishing Season during the breeding Season benefit a Species? A per-recruit-based approach using Cymbula Granatina as an Illustration
… on the presumption that they increase reproductive output of fished populations. This is.based on the assumption that the imposition of a closed season during the breed~· season allows more individuals to reproduce, as they are not being harvested.I evaluated the validity of imposing …
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The Response of a protandrous species to exploitation, and the implications for management: a case study with patellid limpets
… to examine the effect of exploitation on the reproductive output of a protandrous (male to female sequential) hermaphrodite. Patellid limpets are broadcast spawners which can have specific implications for the effect of exploitation on reproductive output, due to sperm limitation. The combined …
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Novel approaches to toxicity testing in Daphnia magna
… toxicant induced metabolic effects to reduced reproductive output in D. magna. FT-ICR MS metabolomics was determined to be a feasible approach for toxicity testing of both whole-organism homogenates and haemolymph of D. magna. It is capable of discriminating between life-stages of D. magna as …
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Review and optimization of housing and husbandry of anemonefishes for use in research
… 9-liter (2-gallon) tanks. Results suggest that reproductive output was significantly reduced among breeding pairs in experimental 9-liter tanks when compared to those housed in standard 120-liter tanks. The experimental manipulation of husbandry of A. percula was conducted over a 3-month period, …
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An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)
… another eight colonies acting as the controls. Reproductive output, colony size, dispersal events and several environmental variables were measured between 2010 and 2015. This was done to determine (1) what effect nest predator exclusion had on reproductive output; (2) how this related to colony …
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Reproductive dynamics of the male Norway lobster, Nephrops norvegicus (L.)
… research was to examine various aspects of the reproductive biology of male Nephrops norvegicus. Due to differnces in the reproductive behaviour between the sexes males suffer greater fishing mortality. A reduction in the numbers and size of males within a fished population may have effects on …
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The reproductive ecology of Minuartia patula Michx. Mattf. (Caryophyllaceae)
… rare plants a thorough understanding of their reproductive ecology is essential for the development of effective conservation strategies. In a two year study, I researched several aspects the reproductive ecology of Minuartia patula at five populations in northeastern Illinois. In particular, I …
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Evolutionary and proximate constraints on egg size in butterflies
… maternal nutrition. Both are assumed to affect reproductive traits and thereby maternal and offspring fitness. Phenotypic correlations between maternal size and egg size within various butterfly species as well as a two-trait selection experiment on simultaneous changes in both traits in the …
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The Implications of the Target-Area Hypothesis on the Population Dynamics of the Spotted Spiny Lobster, <i>Panulirus guttatus</i>
… size could have profound impacts on the local reproductive success of species if mating is size-dependent or if fecundity is related to male or female size.</p> <p>I used laboratory experiments and field observations to test these predictions of the target-area hypothesis by determining if …
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From physiology to pixels: Resource allocation tradeoffs and noninvasive technologies for studying marine mammals
Long-term energy management shapes survival and reproductive success across mammals. Using the exceptional >60-year Weddell seal (Leptonychotes weddellii) demographic study in Erebus Bay, Antarctica, this dissertation links individual physiological traits to lifetime reproductive output in a …
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Demographic and environmental determinants of reproductive success in Synthyris bullii, a rare endemic species
… and environmental factors that may influence the reproductive ecology of Synthyris bullii, a rare perennial species endemic to North American prairies and savannas. In Chapter 1, I explore the relationship between reproductive success and floral quantity versus quality. The results of this study …
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Determinants of variation in productivity, adult survival and recruitment in a declining migrant bird : the Whinchat (Saxicola rubetra)
… was rare because food availability did not limit reproductive output. Neither did the availability of suitable breeding habitat apparently limit the population, but nest productivity was lower than expected, mainly because of a high rate of nest failure due to nocturnal predators. Adult apparent …
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Life history traits and population processes in marine bivalve molluscs
… in broadcast-spawning bivalves, effects on reproductive output and juvenile survival, which are strong in many lab studies, may not necessarily playa large role in field populations. The life history of this clam, with natural variation in recruitment from year to year, further reduces the …
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Management and Mother Nature: piping plover demography and condition in response to flooding on the Missouri River
… used estimates from these analyses to calculate reproductive output, reproductive output necessary for a stationary population, and population growth (λ). For adult condition and egg (clutch) mass we used generalized linear mixed regression, and for pre-fledge chick growth rates we used a …
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