Global ETD Search

1	Study on the biodiversity of opisthobranchs in Taiwan and adjacent islands Chang, Yen-Wei 20 December 2012 (has links) A total of 782 sea slug species (opisthobranch molluscs) within 161 genera, 56 families, and 7 orders are authentically recorded from Taiwan¡¦s Exclusive Economic Zone. Among these species, 459 species (58.7 %) are identified to species level and the other 323 species (41.3 %) are undescribed species. In terms of the whole Opisthobranchia fauna of the tropical western Pacific Ocean, approximately 1000 species are expected from Taiwan¡¦s EEZ. As most of the previous surveys on within-area species diversity were carried out in daytime, diel variation (i.e., day and night) in the species composition of sea slugs has been neglected. In order to assess whether such estimations for community diversity based only on daytime surveys are accurate, I undertook replicated diel surveys for 12 consecutive months (from December 2009 to November 2010) at Shilang Marine Reserve, Green Island (Lyudao), Taiwan. Phyllidiella pustulosa was observed most often during the daytime surveys, while Tritonia sp. 1 (an undescribed species) was the most abundant species at night. The results showed the species composition was clear different. During the field surveys, I found the difficult to identify the phyllidiid nudibranchs. Hence, I search for the additional taxonomic characters for phyllidiid nudibranchs base on integumentary spicules and gene sequences (COI and 16S genes). The results showed the spicules characters might provide the character to distinguish the Phyllidiella from other phyllidiid genera, but they were not informative at the species level. The results on molecular phylogeny showed that taxonomic status (both at the species and generic levels) of most phyllidiid genera, except Phyllidiella, received strong supports from COI gene and 16S gene. In contrast, each Phyllidiella species did not form a clade (suggesting the possibility of over estimating the species number in this genus). Finally, I described and illustrated three distinctive new species of Tambja (Nudibranchia: Polyceridae) from Taiwan and Australia. Among these three species, two of them were collected from Australia the other was collected from Taiwan. Tambja dracomus sp. nov. which is only distribution in cool temperate coastal waters in southeastern Australia and northern New Zealand; T. caeruleocirrus sp. nov. which is distributed in warm temperate coastal waters in eastern Australia, southeast Pacific Ocean. Tambja pulcherrima sp. nov. is widely distributed throughout the tropical, subtropical and warm temperate waters in western Pacific Ocean from Japan to northern New Zealand. opisthobranchs nudibranchs Taiwan¡¦s EEZ Phyllidiidae spicules molecular phylogeny new species description
2	The <i>Phanuromyia galeata</i> species group (Hymenoptera, Platygastridae, Telenominae): shining a lantern into an unexplored corner of Neotropical diversity Nesheim, Katherine Corre 10 August 2017 (has links) No description available. Entomology Animals Biology Evolution and Development Morphology Museums Organismal Biology Zoology
3	Mekanisk uppgrävning: ett effektivt verktyg mot den invasiva främmande arten gul skunkkalla (Lysichiton americanus) : En utredning av behandlingsmetoder Kekäle, Oscar January 2023 (has links) Den biologiska mångfalden minskar globalt och ett av de största hoten utgörs av invasiva främmande arter. Natura-2000 området Fylleån, Halland, huserar en av de största svenska populationerna av gul skunkkalla (Lysichiton americanus). Arten utgör ett hot mot de naturvärden som finns i Fylleån och är subjekt för extensiva behandlingsarbeten i området för att motarbeta växtens effekt på ekosystemet. Det finns i dagsläget ingen evidens för att behandlingsmetoderna som presenteras av Naturvårdsverket och Havs- och vattenmyndighetens metodkatalog har effektivitet i svenska vattendrag. Målet med min studie är att undersöka effektiviteten av mekanisk uppgrävning samt ytlig hetvattensbehandling som behandlingsmetoder för gul skunkkalla. Jag undersöker även lämpligheten för användandet av övriga metoder presenterade av metodkatalogen och metoderna hetvattensbehandling och fröställningsborttagning som inte listats i metodkatalogen men som testas av myndigheter i viss utsträckning. Den första delen av studien genomförs som jämförelsestudie mellan områden som behandlats i olika grad med mekanisk grävning och hetvattenbehandling för att bestämma metodernas effektivitet. Den andra delen av min studie var att genom en litteraturgenomgång med metodkatalogen som utgångspunkt avgöra lämpligheten på och reflektera över metoderna samt reflektera över metodernas lämplighet att användas civilt. Min slutsats är att mekanisk grävning ger minskande populationer och signifikanta skillnader i individantal, förutsatt att behandlingen utförs rätt och konsekvent. Jag resonerar att andra behandlingsmetoder kan påverka mer organismer än vad man avsett och att de därför är olämpliga att bruka i Fylleån. Jag diskuterar vad jag anser är rimligt idéellt arbete i nuläget samt framtida potential och behovet av information i rätt kanaler. / Biodiversity is decreasing globally and one of the biggest threats is invasive alien species. The Natura-2000 area Fylleån, Halland, houses one of the largest Swedish populations of the American skunk cabbage (Lysichiton americanus). The species poses a threat to the natural values found in Fylleån and is subjected to extensive treatment to counteract the plant's effect on the ecosystem. There is currently no evidence for the effectiveness of the treatment methods presented by Naturvårdsverket and Havs- och vattenmyndighetens method catalog in Swedish watercourses. The goal of my study is to investigate the effectiveness of mechanical excavation and superficial hot water treatment as treatment methods for American skunk cabbage, along with hot water treatment and seed stand removal which are not listed in the method catalog but are tested by authorities to a certain extent. Through a comparative study between areas treated to varying degrees with mechanical digging and hot water treatment, I determine the effectiveness of the methods. The second part of my study was to try to determine the suitability of and reflect on the methods, as well as reflect on the suitability of the methods for civilian use through a literature review using the method catalog as a starting point. My conclusion is that mechanical digging produces declining populations and significant differences in found individuals, provided the treatment is carried out correctly and consistently. I reason that other treatment methods can affect more organisms than intended, and that they are therefore unsuitable for use in Fylleån. Invasive species Yellow skunk cabbage American skunk cabbage Lysichiton americanus Ecology Botany IAS Halland Plants Nature Methodolgy Mechanical digging hot water treatment heatweed glyfosate climate Lysichiton Araceae inventory species description statistical analysis litterature review watercourse invasive plants Sustainability Biology Natural sciences Halmstad university Invasiva främmande arter Gul skunkkalla Lysichiton americanus Ekologi Botanik heatweed Araceae IAS Halland Växter Natur Behandlingsmetoder Mekanisk uppgrävning hetvattenbehandling glyfosat klimat kalleväxter inventering artbeskrivning statistisk analys metodkatalogen litteraturgenomgång vattendrag invasiva växter globala målen hållbarhet Biologi Naturvetenskap Högskolan i Halmstad Natural Sciences Naturvetenskap Biological Sciences Biologiska vetenskaper Ecology Ekologi Botany Botanik

1

Page generated in 0.1027 seconds