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 48 for “"sympatry"”.
-
Is meadowlark habitat segregation within sympatry behaviorally mediated?
… understanding of meadowlark habitat use within sympatry. At the patch scale, area-sensitivity, vegetation structure, and vegetation composition have been identified as important factors influencing habitat selection. It is also widely recognized that community assemblage is influenced by …
-
Acoustic Signals of Closely Related Bird Species Differ More in Sympatry Than in Allopatry - But Not If They Are Learned
… showed no difference in divergence between sympatry and allopatry. Overall, our results suggest that learning may influence patterns of signal divergence in sympatry, that different selective pressures likely act on different aspects of acoustic signals, and that the methods we use to …
-
A test of the mechanical isolation hypothesis in two similar spider species
… displacement was occurring between areas of sympatry and allopatry. Differences in both mean and variance were observed, but the number that differed between regions of sympatry and allopatry was not greater than the number that differed between adjacent regions of sympatry. Thus, these …
-
Evaluating Competition Between Sympatric Flying Squirrels (Glaucomys Spp.) In Northeastern Minnesota
… across species, sex, zone of allopatry and sympatry. There were no significant differences in home range size by any metric, although we observed the trend that male home ranges were larger than female home ranges. We did not find evidence for spatial partitioning between species and …
-
Patterns and processes of speciation in North American chorus frogs (Pseudacris)
… isolation between two chorus frog species in sympatry. I find that male signals show a repeated pattern of divergence in sympatry, and that different axes of the signal diverge in different populations, suggesting that heterospecific overlap may lead to reproductive isolation among conspecific …
-
Behavioral and genomic patterns of evolution during speciation via reproductive and agonistic character displacement
… conspecifics over heterospecifics in areas of sympatry compared to allopatry. Behavioral isolation can potentially evolve among populations within a species as a correlated effect of RCD or ACD, termed cascade RCD (CRCD) or cascade ACD (CACD). My dissertation research integrated behavioral and …
-
An experimental test of intra- and inter-specific competition between invasive western mosquitofish (Gambusia affinis) and native plains topminnow (Fundulus Sciadicus)
… shared preferred habitat (a slow-moving pool) in sympatry compared to allopatry, and the isodar analysis demonstrated that intra-specific competition was significantly stronger than inter-specific competition at all temperature levels. This analysis of habitat selection was corroborated by …
-
Patterns and processes underlying genetic diversity in the Namaqua rock mouse Micaelamys namaquensis Smith, 1834 (Rodentia : Muridae) from southern Africa
… in M. namaquensis. In addition, localities of sympatry (lineages in sympatry) should also be studied in more detail in order to help resolve the current taxonomic uncertainties within M. namaquensis. Future research should therefore include a multidisciplinary approach, such as cytogenetics, …
-
Parvulastra exigua in South Africa: one species or more?
… oceanic islands. In South Africa, it is found in sympatry with the endemic Parvulastra dyscrita and the two are differentiated predominantly by gonopore placement. P. exigua gives rise to distinct lecithotrophic benthic larvae that hatch from sticky egg masses laid via oral gonopores. In contrast, …
-
Speciation and the evolution of male breeding coloration in darters
… E. caeruleum and male E. spectabile in both sympatry and allopatry. In contrast, reproduction isolation was high between female E. spectabile and male E. caeruleum in sympatry but low in allopatry. This pattern is consistent with reinforcement acting asymmetrically on behavioral isolation …
-
DIET ANALYSIS OF NATIVE AND NON-NATIVE JUVENILE SALMONIDS IN A LAKE SUPERIOR TRIBUTARY
… Lakes tributaries, it also suggests that this sympatry has costs for the native brook trout.</p>
-
Polyploid speciation in the Greater Cape Floristic Region : species limits within Ehrhara calycina
… phenetic clusters among specimens from sites of sympatry, and these were termed ‘robust’ and ‘slender’ forms. This translated to a broader sampling of specimens from across the GCFR (n = 516), of which over 91% could be attributed to one or other form with >90% confidence using linear …
-
Geographical variation in the genus Astarte (Phylum Mollusca: Class Bivalvia) from the Yorktown and Jackson Bluff formations (early Pliocene) of the Atlantic coastal plain
… that they are distinct species living in sympatry. Factors influencing geographical variation include larval dispersal strategy and the effect of the environment.
-
Changes in Patterns of Territory and Habitat Overlap in Wood-Warblers Over Evolutionary Time
… after closely related species have returned to sympatry.
-
Taxonomic Revision of the Pirate Perches (Percopsiformes: Aphredoderidae) Reveals Three New Species and Elevates Two Subspecies
… five species, four of which exhibit widespread sympatry in the Southeastern United States. I elevate A. sayanus sayanus and A. sayanus gibbosus to species, supplement previous descriptions, and describe three new species, A breviopercularis sp. nov., A. retrodorsalis sp. nov., and A. ornatus sp. …
-
Reinforcement and cascade reinforcement in the lucania system: the effects of experimental design, sex, and heterospecific pairings on mate preference
… of reproductive isolation between areas of sympatry and allopatry (Servedio and Noor 2003; Hoskin and Higgie 2010; Pfennig 2016). This often involves using behavioral assays and metrics to determine conspecific or native mate preference in the laboratory. Despite the importance of using …
-
Chromosomal inversions as a mechanism for sympatric differentiation in common quails
… processes and contributes to divergence in sympatry. In Chapter 1, quails wintering in southern Iberia are analysed to determine the genetic composition of the wintering population and to test whether the presence of overwintering individuals reflects potential spatial segregation linked to …
-
Fine screen faunal analysis from the Hartley Site (FaNp-19)
… provided a good framework on which to base the sympatry analysis. These species, many from similar environments and others that are more adaptable, afforded a comprehensive look at the past environment.
-
Population genetic structure of a planktonic diatom in the Gulf of naples : <i>Pseudo-nitzschia multistriata</i>
… screening uncovered two populations in sympatry in 2008, only one of which reappeared in 2009. The ITS sequences of the strains were of distinct types,called A-type, B-type and a mixed type (NB). The two populations also showed distinct ITS-type proportions, supporting their …
-
Elucidating cryptic diversity in East African frogs : the case of Arthroleptis francei Loveridge, 1953
… by two separate taxa, which were found in sympatry within the same locality. The putative distinct taxa could however not be separated with morphometric means, or through colouration. A species distribution model based on environmental data suggests the possible presence of A. francei …
Page 1 of 3