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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Ground dwelling and flower visiting arthropods in sown weed strips and adjacent fields /

Frank, Thomas January 1994 (has links)
Diss. Naturwiss. Bern (kein Austausch). / Literaturverz.
12

Functional Relationships among songbirds, arthropods, and understory vegetation in Douglas-fir forests, western Oregon /

Hagar, Joan C. January 2003 (has links)
Thesis (Ph. D.)--Oregon State University, 2004. / Typescript (photocopy). Includes bibliographical references (leaves 111-130). Also available on the World Wide Web.
13

Response of arthropods to different intensities of thinning in Oregon /

Yi, Hoonbok. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2004. / Printout. Includes bibliographical references (leaves 82-92). Also available on the World Wide Web.
14

The effect of different vineyard management systems on the epigaeic arthropod assemblages in the Cape Floristic Region, South Africa /

Gaigher, René. January 2008 (has links)
Thesis (MScConsEcol)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.
15

Untersuchungen über die Endigung der Nerven in den quergestreiften Muskeln der Arthropoden ...

Mangold, Ernst Ludwig Karl Wilhelm Ferdinand, January 1905 (has links)
Inaug.-Diss.--Jena. / Lebenslauf. "Literaturverzeichnis": p. 65-69.
16

The structure and dynamics of arthropod communities in an old-field ecosystem /

Lane, Kristin E. January 1900 (has links)
Thesis (M.A.)--Humboldt State University, 2006. / Includes bibliographical references (leaves 55-59). Also available via Humboldt Digital Scholar.
17

Vliv typu zemních pastí a typu konzervační kapaliny na odchycenou epigeickou faunu

Šafář, Jaroslav January 2009 (has links)
No description available.
18

Patterns in the abundance and distribution of littoral and supralittoral arthropods on Marion Island

Mercer, Richard Dennis 31 January 2007 (has links)
This study provides the first quantitative analysis of the littoral and supralittoral arthropod assemblages of sub-Antarctic Marion Island. Seventeen mite species (126 203 individuals) from 11 families were found on the shore at Macaroni Bay. Three families dominated the assemblages in both abundance and diversity: the Hyadesiidae, Ameronothridae and Halacaridae. Six insect species from three orders were found on the shore. Species richness increased from one in the littoral, to four and two species in the Mastodia and Caloplaca zones, respectively. The littoral, chironomid midge, Telmatogeton amphibius was the most abundant insect species, constituting 80% of all insects counted. Arthropod assemblages corresponded closely to the cryptogram dominated zonation patterns previously identified for the Marion Island shore. This clear association between arthropod and cryptogam zonation patterns provided a clear indication of habitat specificity in many of the species, and a quantitative analysis of habitat specificity on a species by species basis supported this tenet. The specificity of most species to the shore, which forms part of the epilithic biotope, is most likely a consequence of the considerable age of this biotope compared to the younger, post-glacial vascular vegetation. Tourist species, i.e. species transient to an assemblage, inflated species richness in zones and the distribution ranges of species across zones. It is suggested that previous, qualitative analyses of shoreline arthropod communities may have overestimated species ranges and richnesses because of the inclusion of tourist species. It is suggested that if a sound understanding of patterns in and processes underlying Antarctic arthropod assemblages is to be achieved, quantitative analyses must be expanded in the region. In this study the spatial patterns of littoral and supralittoral arthropods from sub-Antarctic Marion Island are examined. Primary consumers were by far the most diverse group on the shore, with nine algivore and ten fungivore species from a total of 23 species. Positive species associations were found in the Mastodia and Caloplaca zones and positive abundance covariation in the Verrucaria, Mastodia and Caloplaca zones. There were no negative associations between any taxa, indicating that interspecific interactions on the shore are either minimal or absent. Significant interactions were related to the diversity of the respective habitats, with higher diversity resulting in higher levels of positive associations and abundance covariation. High levels of aggregation clearly demonstrated that species were not randomly distributed within habitats. Intraspecific aggregation was generally higher than interspecific aggregation in the five habitats and if competition was to occur it would most likely be among conspecifics. The absence of suitable biological information for species precluded further analyses of competition. However, if competitive interactions were found to occur between heterospecifics then coexistence would best be explained using the aggregated nature of superior competitors, allowing weaker competitors to coexist in zones. Positive associations between species were attributed to favourable environmental conditions, the availability of limiting resources (e.g. shelter) and the structure of the dominant cryptogram species. Body sizes, spanning five orders of magnitude (0.5 J.1g - 26 mg), were measured for 59 of the approximately 120 invertebrate species on Marion Island. Mass-length and fresh-dry mass relationships were calculated for orders, families and species (for those with sufficient data). A comparison of their slopes indicates that for prediction of body mass it may be useful to use regressions from the lowest taxonomic rank possible. Differences between the mass-length relationship for Marion Island insects (log mass = -4.294 + 3.151 log length) and other relationships on continental assemblages raises the questions as to the applicability of these results. This study should prove useful for estimating body sizes for other, similar taxa in the Antarctic and provide baseline information on an important species trait that seems to be changing with local and global environmental changes. / Dissertation (MSc (Entomology))--University of Pretoria, 2007. / Zoology and Entomology / unrestricted
19

Aspects of developmental biology in Palaeozoic euarthropods

Ortega-Hernández, Javier January 2014 (has links)
No description available.
20

The response of arthropod assemblages to peatland restoration in formerly afforested blanket bog

Pravia-Fernández, Ainoa January 2018 (has links)
The restoration of drained afforested blanket bogs is a cost-effective management approach in peatland conservation that aims to restore key ecosystem functions such as biodiversity and carbon storage and sequestration. Although arthropods are one of the most abundant and widespread animal groups in peatlands, little research has been carried out to assess their response to the variety of restoration management techniques that have been applied in afforested blanket bogs. We assessed the effectiveness of restoration by investigating the restoration trajectory of arthropod assemblages in formerly afforested blanket bog. We first looked at the long-term trajectory of arthropod assemblages, as well as carabid and moth taxa, in a chronosequence of tree-felled/drain-blocked treatments. Then, we looked at the short-term response of arthropod and carabid assemblages in treatments under varying regimes of brash management. General arthropod assemblages, and the functional traits of carabids and moths, were used to further investigate what type of biotic and abiotic parameters might be of importance during restoration. Lastly, we looked at potential biondicators of restoration progress to be used in restoration monitoring. The long-term restoration trajectory showed that typical bog assemblages are yet to be achieved due to persistence of generalists, as well as absence of bog specialists. Divergence in assembly trajectory was found at 18 years since onset of restoration, suggesting the emergence of an alternative state. Short-term restoration shows that brash might act as temporary habitat at early stages, where carabids favour lower structurally complex habitats than arthropods. Broad patterns of moth distribution revealed trait syndromes associated with blanket bog, whilst abiotic components such as vegetation structure, temperature, plot perimeter and blanket bog connectivity were found to be key for arthropod assemblages. The latter suggests potential legacy and edge effects associated with the restoration process. Arthropods and carabids showed high habitat specificity and fidelity, providing high bioindicator potential for restoration progress. This thesis shows that typical bog arthropod assemblages largely rely on habitat microstructure, particularly Sphagnum mosses, and associated microclimates for survival. Management can provide temporary refuge for arthropods, but the re-establishment of peat-forming vegetation and water table depth is essential for the return of typical bog assemblages. Though trade-offs might be encountered in the long-term restoration of peatland functions, a restoration framework is provided for the monitoring of arthropod assemblages.

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