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 57 for “"life-history characteristics"”.
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Genetic and Life History Characteristics of Venustaconcha Ellipsiformis and Venustaconcha Pleasii (Bivalvia, Unionidae) in the Ozark Plateaus Region
Genetic, morphological, and life history characteristics were compared among 7 populations of two closely related taxa of freshwater mussels in river systems of the Ozark Plateaus. Venustaconcha pleasii (White River system) exhibited fixed electrophoretic allelic differences from V. ellipsiformis …
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Life-History Characteristics and Fishery Dynamics of Red Drum (<i>Sciaenops ocellatus</i>), in the North-Central Gulf of Mexico
… limited approaches that necessitate accurate life history information. I estimated the year-specific and year-aggregated escapement rates for the Mississippi stock (years 2004 to 2015), which were sensitive to mortality estimation methods; year-aggregated estimates were 6.9 to 28.2 % depending …
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Subspecific and Geographic Variation in Life-History Characteristics in Two Subspecies of Painted Turtle, Chrysemys Picta Bellii and Chrysemys Picta Dorsalis
Reproductive and body size characteristics were compared for two subspecies of Chrysemys picta to determine if variation in these traits is mainly influenced by geography (i.e. latitude and elevatoin) or if they vary subspecifically. Specimens of C. p. bellii and C. p. dorsalis were collected from …
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The Evolutionary Effects of Fishing: Implications for Stock Management and Rebuilding
… inter-generational morphological and life-history changes in fish stocks that have been impacted by size-selective harvest. Evolutionary processes in biological populations occur through differential survival and reproductive success based, in part, upon individual phenotypic …
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Predicting the Repercussions of Anthropogenic Landscape Modifications on the Biota Using Species Focused Adaptable GIS and Spatial Dynamic Models
… various species and incorporates user-defined life history characteristics, habitat needs or movement behaviors. We showed, through the development and testing of these tools, that: (1) considerations of the spatial arrangement and structure of habitat patches combined with species life history …
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Growth of Understory Saplings in a Forest Exposed to Elevated Carbon Dioxide
… different tree species varies and depends upon characteristics that enable response to CO2 concentration. The relationship between the sources (e.g., leaves) and sinks (e.g., new, developing leaves and roots) has been found to explain some of the variation in response. However, explanations for …
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Ecological significance of variation in Themeda triandra Forsk : a case of intra-specific divergence in life history strategies?
… rangelands. The approach was to investigate life history characteristics of rangelands at four sites representing climate extremes. These differed in the amount, and predictability, of rainfall and the incidence of frost. The approach was novel in that a single species, Themeda triandra, was …
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Predicting the distribution of thickets and forests on the Cape Peninsula, Cape Province using linear regression analyses
… fynbos. The species constituents exhibit life history characteristics significantly different from fynbos species, in that reproductive biology and recruitment are not coupled to fire. The limited occurrence of forests and thickets suggest that there may be specific abiotic factors which …
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Spatial and Temporal Comparisons of Gopher Rockfish (Sebastes carnatus) Life History and Condition in South Central California
… have shown environmental factors influence life history traits in fishes. Understanding intraspecific variability of life history characteristics and condition is necessary to determine local fisheries management strategies. Gopher rockfish,<em> Sebastes carnatus</em>, comprise 50% of the …
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Reproductive Life History and Shell Shape Variation of Three Species of Elimia (Pleuroceridae) in the Lower Etowah River Basin
… characters are associated with differences in life history characteristics. Individuals of <em>E. modesta</em>, <em>E. carinocostata</em>, and <em>E. carinifera</em>were collected from nine sites in three streams in the lower Etowah River Basin. Females were separated by species and placed in …
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The diet, reproductive biology age and growth of yellowtail, Seriola lalandi, in South Africa
… yet little information is available on their life-history. This study aims to add information on the diet and feeding habits, reproductive biology and the age and growth of yellowtail in South Africa. The diet of 62 yellowtail caught in the Western Cape of South Africa between 2011 and 2012 …
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Global Conservation Status of Croaker and Drum (Family: Sciaenidae) and Role of the Maw Trade
… trade. Sciaenids exhibit a diverse array of life history characteristics, such as high fecundity, large body size, formation of spawning aggregations, and longevity. Some characteristics increase their susceptibility to anthropogenic stressors. Despite being ecologically and economically …
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Phasgonophora sulcata Westwood (Hymenoptera: Chalcididae): A Potential Augmentative Biological Control Agent For The Invasive Agrilus planipennis Fairmaire (Coleoptera: Buprestidae) in Canada
… (1) determination of the species' basic life history characteristics; (2) analysis of the wasp's courtship behaviours and elucidation of adult-produced pheromones; (3) identification of semiochemicals used in host searching; and (4) observations on the within-tree and temporal …
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Growth and Reproduction of Atlantic Chub Mackerel (<i>Scomber colias</i>) in the Northwest Atlantic
… have necessitated the description of the stocks life-history characteristics. The purpose of this study was to address the absence of regional information on growth and reproduction. Growth models were fit in a Bayesian framework. The length-at-age relationship was described using four non-linear …
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Development and utilization of molecular tools to understand invasion biology in Centaurea maculosa (spotted knapweed)
… plant. I then give a brief overview of the life history characteristics of spotted knapweed and report on the development and characterization of a spotted knapweed gene library. By utilizing sequence information from the gene library, I determined that both ploidy (diploid or tetraploid) …
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Updated life history and population structure assessment of spiny dogfish, Squalus acanthias, in the Gulf of Maine
… in targeted species, an update of previous life history parameters is warranted to effectively manage the population. Although updated and accurate life history parameters are important, it is crucial that these parameters are applied to the correct populations, especially when there is …
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Climate change and invasive species interact to impact succession and diversity in Gulf of Maine marine fouling communities
… but by primary substrate due to the seasonal life-history characteristics of the invasive species. Interestingly a four season development was observed between 1979 and 1982 and a three season development was detected between 2003 and 2006. The smaller number of stages was linked to a rise in …
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