| 1. |
- Persson, Karl-Johan, et al.
(författare)
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Differential tolerance to cyanobacterial exposure between geographically distinct populations of Perca fluviatilis
- 2013
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Ingår i: Toxicon. - : Elsevier. - 0041-0101 .- 1879-3150. ; :76, s. 178-186
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Tidskriftsartikel (refereegranskat)abstract
- Toxic cyanobacterial blooms are an important problem worldwide. Cyanobacteria may negatively impact young-of-the-year (YOY) fish directly (toxin production, turbidity, decrease in water quality) or indirectly (trophic toxin transfer, changes in prey species composition). Here we test whether there are any differences in cyanobacterial tolerance between four geographically distinct populations of European perch (Perca fluviatilis). We show that P. fluviatilis may develop tolerance against cyanobacteria demonstrated by the ability of individuals from a marine site (exposed to annual cyanobacterial blooms) to increase their detoxification more than individuals from an oligotrophic site (rarely exposed to cyanobacteria). Our results also revealed significant interaction effects between genotypes within a population and response to cyanobacterial exposure in terms of absolute growth and detoxification activity. This genotype by treatment interaction may result in local adaptations to cyanobacterial exposure in P. fluviatilis. Hence, the sensitivity against cyanobacterial exposure may differ between within species populations increasing the importance of local management of fish populations.
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| 2. |
- Persson, Karl-Johan, et al.
(författare)
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Effects of the filamentous cyanobacterium Nodularia on fitness and feeding behavior of young-of-the-year (YOY) Eurasian perch (Perca fluviatilis)
- 2011
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Ingår i: Toxicon. - : Elsevier BV. - 0041-0101 .- 1879-3150. ; 57:7-8, s. 1033-1040
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Tidskriftsartikel (refereegranskat)abstract
- AbstractThis study reveals that both cyanobacterial toxicity and turbidity have the potential to reduce the growth and energy storage of young-of-the-year (YOY) perch and thereby influence survival rates. During the 1990's a reduction in recruitment of YOY perch (Perca fluviatilis) occurred along the Swedish East coast. Concurrently, large blooms of filamentous cyanobacteria have increased in the Baltic Proper and in coastal waters. This study examined whether extended exposure to toxic and non-toxic filamentous cyanobacterium Nodularia affect YOY perch growth and feeding behavior under simulated bloom conditions (30 days at 50 μg Chl a L−1). Specific growth rate (SGR), the somatic condition index (SCI) and the lipid content of YOY perch (10–12 weeks old) were significantly lower in perch exposed to Nodularia compared to fed controls (no Nodularia). YOY perch exposed to non-toxic Nodularia displayed a higher attack rate than perch living in Nodularia free controls in 2 out of 3 trials. Reductions in growth and energy storage, mediated by cyanobacteria, increase the risk of starvation and predation and could locally influence recruitment of YOY perch.Highlights► We investigate the effects of toxic and non-toxic cyanobacterial (Nodularia sp.) on young-of-the-year (YOY) perch (Perca fluviatilis). ► Endpoints are specific growth rate (SGR), lipid content and feeding behavior (feeding and attack rate). ► Results show that both non-toxic and toxic Nodularia reduce SGR and lipid content of YOY perch. ► Reduced growth and energy storage may locally influence recruitment of YOY perch.
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| 3. |
- Westerstrom, Alexander, et al.
(författare)
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Envenoming following bites by the Balkan adder Vipera berus bosniensis - First documented case series from Bulgaria
- 2010
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Ingår i: Toxicon. - : Elsevier BV. - 0041-0101 .- 1879-3150. ; 56:8, s. 1510-1515
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Tidskriftsartikel (refereegranskat)abstract
- We report the first detailed accounts of bites by the Balkan adder, Vipera bents bosniensis from Bulgaria. Documentation of bites by this subspecies is very rare in the literature and most available accounts are from the northern limit of its distribution. V berus bosniensis is considered to possess neurotoxic venom but little evidence has hitherto been available to support this supposition. In this case series symptoms typical of adder bites developed including oedema, nausea, dizziness, lymphangitis, vomiting, and diarrhoea together with aberrant symptoms such as diplopia and ptosis that confirm the presence of neurotoxic venom in Balkan adders. In addition, unusual and atypical symptoms of adder bites such as painless bites and muscle cramps appeared. The inadequate treatment in hospital and the remote habitats in which this species is encountered are potential sources of complication.
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| 4. |
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