| 1. |
- Jönsson, K. Ingemar, 1959-, et al.
(författare)
-
Environmental adaptations : radiation tolerance
- 2019
-
Ingår i: Water bears. - : Springer. - 9783319957012 - 9783319957029 ; , s. 311-330
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Several studies in different species have documented that tardigrades are among the most radiation-tolerant animals on Earth, surviving doses of ionizing radiation on the order of kGy. Both low-LET and high-LET radiation have been used with no apparent differences in the tolerance of the animals. Tolerance to ionizing radiation in tardigrades also seems to be independent of whether the animal has entered a dry anhydrobiotic state or is hydrated with normal activity. However, when exposed to UV radiation, desiccated tardigrades show a higher tolerance than hydrated animals. Recent studies in several species have shown that tardigrade embryos have considerably lower tolerance to ionizing radiation compared to adults, and embryos in the early stage of development are clearly more sensitive to radiation than those in the late developmental stage. The molecular mechanisms behind radiation tolerance in tardigrades are still largely unclear, but available evidence suggests that mechanisms related to both the avoidance of DNA damage and the repair of damage are involved.
|
|
| 2. |
- Söderquist, Pär
(författare)
-
Large-scale releases of native species : the mallard as a predictive model system
- 2015
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Human alteration of natural systems, and its consequences are of great concern and the impact on global ecosystems is one of the biggest threats that biodiversity stands before. Translocations of invasive species, as well as intraspecific contingents with non-native genotypes, whether they are deliberate or unintentional, are one such alteration and its consequences are continuously being assessed. The mallard (Anas platyrhynchos) is the most numerous and widespread duck in the world and a flagship in wetland conservation. It is also an important game species which is heavily restocked for hunting purposes, especially in Europe where over three million ducklings are released every year. Because of its hunted status, its abundance, and the number of released individuals, it can serve as a model species to study effects of releases, both for conservation and restocking for hunting, on wild populations. In this thesis the status of the mallard was assessed in the Nordic countries and the effects of releases on the wild populations were studied by mining historical ringing data, comparing morphology of present-day wild, farmed, and historical mallards, and analyzing phylogeography of wild and farmed mallards in Europe. The status of the mallard population in the Nordic countries are generally good, however, a joint effort of European countries is needed to monitor and manage the population. A significant difference between wild and farmed mallards concerning longevity, migration, bill morphology and genetic structure was also found, together with signs of cryptic introgression of farmed genotypes in the wild population with potential fitness reduction as a result. The effect is however limited by that only a fraction of released farmed mallards reach the breeding season due to low survival. A natural captive environment is crucial to keep individuals wild-like with high survival rates after release. However, with an introgression of potentially maladapted farmed genotypes leading to a reduction in fitness, a low survival of released mallards would favor the wild population. A legislative change regarding obligation to report numbers, provenance, and release sites of farmed mallard should be considered, together with practical solutions of ringing and genetic monitoring of released mallards.
|
|
| 3. |
- Elmberg, Johan
(författare)
-
Bergand
- 2007
-
Annan publikation (övrigt vetenskapligt/konstnärligt)
|
|
| 4. |
|
|
| 5. |
- Elmberg, Johan, 1960-
(författare)
-
Lever elfenbensnäbben?
- 2013
-
Ingår i: Vår fågelvärld. - 0042-2649. ; 72:2, s. 8-
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
|
|
| 6. |
- Elmberg, Johan, et al.
(författare)
-
Nötkråka
- 2007
-
Annan publikation (övrigt vetenskapligt/konstnärligt)
|
|
| 7. |
- Elmberg, Johan, 1960-
(författare)
-
Nötskrikans vintervanor
- 2012
-
Ingår i: Vår fågelvärld. - 0042-2649. ; 71:5, s. 12-
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
|
|
| 8. |
|
|
| 9. |
- Elmberg, Johan, et al.
(författare)
-
Skedand
- 2007
-
Annan publikation (övrigt vetenskapligt/konstnärligt)
|
|
| 10. |
- Elmberg, Johan, 1960-, et al.
(författare)
-
Snokens barnkammare försvinner
- 2013
-
Ingår i: Fauna och flora. - 0014-8903. ; 108:1, s. 10-16
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
|
|
