Long-term monitoring of the health status of female perch (Perca fluviatilis) in the Baltic Sea shows decreased gonad weight and increased hepatic EROD activity

2006 ◽  
Vol 79 (4) ◽  
pp. 341-355 ◽  
Author(s):  
Tomas Hansson ◽  
Eric Lindesjöö ◽  
Lars Förlin ◽  
Lennart Balk ◽  
Anders Bignert ◽  
...  
Keyword(s):  
Health Status ◽  
Perca Fluviatilis ◽  
Erod Activity ◽  
Gonad Weight ◽  
The Baltic Sea ◽  
Perch Perca Fluviatilis ◽  
Long Term Monitoring ◽  
The Baltic ◽  
Term Monitoring

scholarly journals Adult female European perch (Perca fluviatilis) from the Baltic Sea show no evidence of thiamine deficiency

2021 ◽  
pp. 102081
Author(s):  
Johan Gustafsson ◽  
Karin Ström ◽  
Linus Arvstrand ◽  
Lars Förlin ◽  
Lillemor Asplund ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Adult Female ◽  
Thiamine Deficiency ◽  
Perca Fluviatilis ◽  
The Baltic Sea ◽  
European Perch ◽  
Perch Perca Fluviatilis ◽  
The Baltic

scholarly journals A baseline assessment of the photosynthetic potential of Welwitschia mirabilis using the JIP-test for monitoring and conservation purposes

Bothalia ◽  
2021 ◽  
Vol 51 (1) ◽  
Author(s):  
J.M. Berner ◽  
H. Cloete ◽  
T. Shuuya
Keyword(s):  
Land Use ◽  
Health Status ◽  
Baseline Assessment ◽  
Namib Desert ◽  
Photosynthetic Potential ◽  
Long Term Monitoring ◽  
Welwitschia Mirabilis ◽  
Harsh Climate ◽  
Term Monitoring

Background: Welwitschia mirabilis is highly specialised to survive the harsh climate of the Namib Desert. Changes in land use, such as the expansion of mining activities, may endanger their survival.Objectives: The purpose of this study was to understand the photosynthetic potential of W. mirabilis plants to provide a baseline for future long-term monitoring, and for future comparison to determine plant health status after the onset of mining operations.Methods: The study was conducted in a population of W. mirabilis on the Welwitschia Plains. Chlorophyll a fluorescence data were used to measure plant photochemical potential and analysed using the JIP-test.Results: Significant differences in the photosynthetic potential was observed for W. mirabilis plants located in different catchments. The partial parameters of the PIABS values were also significantly lower, which indicated that all aspects of photosynthesis were influenced.Conclusion: PIABS values can serve as a baseline for future long-term monitoring studies to detect any changes in the health status of W. mirabilis that might result from land use change.

Do cormorant colonies affect local fish communities in the Baltic Sea?

2012 ◽  
Vol 69 (6) ◽  
pp. 1047-1055 ◽  
Author(s):  
Örjan Östman ◽  
Mikaela Bergenius ◽  
Maria Kristina Boström ◽  
Sven-Gunnar Lunneryd
Keyword(s):  
Baltic Sea ◽  
Colony Size ◽  
Fish Communities ◽  
Perca Fluviatilis ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
The Baltic Sea ◽  
Management Actions ◽  
Perch Perca Fluviatilis ◽  
The Baltic

The effects that cormorants have on fish communities have been debated, yet few studies have used the necessary controls and replications to make valid and general assessments. Using both a paired design and time series analysis, we studied associations between colony size of the great cormorant ( Phalacrocorax carbo sinesis ) in the Baltic Sea and local fish community composition. Overall, colony size showed few associations with local fish communities. Most evident was a negative association between colony size and perch ( Perca fluviatilis ) abundances in some areas. But for other species, results were nonsignificant or variable among areas. The Baltic Sea cormorant population has increased over the last decades, and our results suggest that management actions to reduce local cormorant colonies may have a positive effect on local perch abundance. Otherwise, our results predict colony reductions to either have variable or weak effects on adjacent local fish communities.

Complex phylogeographic relationships among the Eurasian perch (Perca fluviatilis) populations in the eastern part of the Baltic Sea Region

Hydrobiologia ◽  
2019 ◽  
Vol 847 (3) ◽  
pp. 925-938
Author(s):  
Adomas Ragauskas ◽  
Dalius Butkauskas ◽  
Petras Prakas ◽  
Karolina Gadliauskienė ◽  
Helen Gajduchenko ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Perca Fluviatilis ◽  
The Baltic Sea ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis ◽  
Baltic Sea Region ◽  
The Baltic
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