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 20 of 67 for “"introduced species"”.
-
Winter dynamics in mountain lakes and impacts of an introduced species to the endangered Devils Hole pupfish
… management decisions. Changes in climate and introduced species are two major threats to aquatic ecosystems. This research explores inherent characteristics of two aquatic ecosystems facing different threats; mountains lakes facing the threat of climate change and an endangered pupfish species …
-
Habitat ecology of the native subtidal snail, Lacuna vincta, in the Gulf of Maine and the impact of two introduced species
… and growth of snails on nine different algal species. The results showed that there were differences in the seasonal abundance patterns of L. vincta populations on different algal species. However, the snail populations in all size classes were found year round on Laminaria saccharina (L.) …
-
Seed biology of a recently introduced species, Myoporum laetum in comparison to a successful invasive alien, Acacia cyclops, in the southwestern Cape, South Africa
… potential of Myoporum laetum, a tree recently introduced into the southwestern Cape, South Africa, was evaluated, by comparing various aspects of its seed biology with those of another bird-dispersed alien, Acacia cyclops which is a successful invader in this region. M. laetum has higher annual …
-
Predation, turbidity, and other factors influencing juvenile Salmonid survival in the lower Snake River
… consumption rates of juvenile salmonids by three introduced species, smallmouth bass (Micropterus dolomieu), walleye (Sander vitreus) and channel catfish (Ictalurus punctatus). Consumption information is crucial because the construction of the Snake River hydrosystem has created a series of …
-
Temporal trends in stream-fish distributions, and species traits as invasiveness drivers in New River (USA) tributaries
… management strategies require knowledge of which introduced species are present and of spatiotemporal trends in the distribution of natives and invaders. In Chapter 2 we developed a quantitative framework to identify spreaders and decliners and estimate invasion chronologies based on a historical …
-
Age, Reproduction, Growth, Condition and Diet of the Introduced Yellow Bass, Morone Mississippiensis, in Barren River Lake, Kentucky
Introduction of fish species to North American drainages has occurred for over 100 years. Introduced fish species have been documented to have adverse effects on both the environment and native species of the drainage into which they have been introduced. To better understand the effects that …
-
Age, Reproduction, Growth, Condition and Diet of the Introduced Yellow Bass, <i>Morone mississippiensis</i>, in Barren River Lake, Kentucky
Introduction of fish species to North American drainages has occurred for over 100 years. Introduced fish species have been documented to have adverse effects on both the environment and native species of the drainage into which they have been introduced. To better understand the effects that …
-
Decline of the Savannah River Redeye Bass (Micropterus Coosae) Due to Introgressive Hybridization With Invasive Alabama Spotted Bass (Micropterus Punctulatus Henshalli)
… lead to the extirpation or extinction of native species through a myriad of different biological mechanisms. Introgressive hybridization is one mechanism that is often overlooked due to difficulty of examination without the use of molecular techniques. However, hybridization can be just as …
-
Taxonomy, systematics and biogeography of South African Cirripedia (Thoracica)
… fauna, of Which 84.6% are cosmopolitan and 15.4% introduced species. This raises the total number of South African Cirripedia (Thoracica) to 86, of which 64.06% are cosmopolitan, 11.24% introduced and 24.7% endemic. Excluded from this, are three unknown species, which are likely to be new to …
-
The Role of Evolutionary Processes in a Biological Invasion: An Experimental Study with <em>Silene latifolia</em>
… threats to biodiversity. The cost of these introduced species is staggering - damages associated with introduced species cost the United States around $138 billion annually. Despite the growing appreciation of the importance of biological invasions, most research has focused solely on the …
-
Native Bees and Pollen Collection: How Flexible Are They?
… have diversified and also collect pollen from introduced plant species. To this end, we investigated whether native bees collected more or less pollen from native plants or introduced species, and whether there are differences in the patterns of pollen collection between the different bee …
-
Native Bees and Pollen Collection: How Flexible Are They?
… have diversified and also collect pollen from introduced plant species. To this end, we investigated whether native bees collected more or less pollen from native plants or introduced species, and whether there are differences in the patterns of pollen collection between the different bee …
-
The vascular flora of the North Chickamauga Creek Gorge State Natural Area, Hamilton & Sequatchie Counties, Tennessee
… yielded 110 families, 329 genera, and 604 species or lesser taxa, including 238 county records. Seventy-six introduced species were found, comprising 12% of the total flora. Eleven species with either a state or federal listing were documented: Castanea dentata, Diervilla lonicera, …
-
The influence of soil fertility and light intensity on field layer development in urban secondary woodlands
… development in urban secondary woodlands with an introduced ground flora, with the aim of contributing towards ground flora enhancement methodology and sympathetic secondary woodland management. The investigation was based on a series of complementary field and greenhouse replicated plot, single …
-
Effects of Barren Reservoir on Upstream Fish Assemblages of Barren River Tributaries
… to migratory fishes, and the influence of introduced species often stocked into reservoirs. It has not been until relatively recently that the upstream effects have been studied. The central theme here is that while the dam proper creates a barrier it is possible that the resulting zone of …
-
Thermal biology and behaviour of two predatory Phytoseiid mites: Amblyseius swirskii (Athias-Henriot) (Acari:Phytoseiidae) and Phytoseiulus longipes (Evans) (Acari:Phytoseiidae)
… to evaluate the risk of establishment of introduced species and investigates temperature related behavioural thresholds for all three species. Laboratory results demonstrate a low level of cold tolerance in A. swirskii and no diapause. Field studies recorded 100% mortality within two weeks …
-
Does Urbanization Facilitate the Establishment of Introduced Monk Parakeet (Myiopsitta monachus) Populations?
… and establishment of some non-native species. Because of the habitat heterogeneity, varying resources, and an overall depauperate ecological community, urban environments may provide multiple underexploited niches for colonization by novel species. The Monk Parakeet (Myiopsitta …
-
MOVEMENTS, ACTIVITY RANGE, HABITAT USE, AND CONSERVATION OF THE JAMAICAN (YELLOW) BOA, EPICRATES SUBFLAVUS
… once common throughout Jamaica. This vulnerable species is now fragmented into small populations throughout the island due to habitat loss, introduced species, human persecution and poaching. Conservation of the boa requires knowledge of the basic ecology of the boa and education of local people. …
-
MOVEMENTS, ACTIVITY RANGE, HABITAT USE, AND CONSERVATION OF THE JAMAICAN (YELLOW) BOA, EPICRATES SUBFLAVUS
… once common throughout Jamaica. This vulnerable species is now fragmented into small populations throughout the island due to habitat loss, introduced species, human persecution and poaching. Conservation of the boa requires knowledge of the basic ecology of the boa and education of local people. …
Page 1 of 4