scholarly journals Behaviour and survival of Common Guillemot Uria aalge chicks at departure from a nest site in the Baltic Sea

Ornis Svecica ◽  
2012 ◽  
Vol 22 (1–2) ◽  
pp. 3-8
Author(s):  
Mårten B Hjernquist ◽  
Måns Hjernquist ◽  
Björn Hjernquist
Keyword(s):  
Baltic Sea ◽  
Nest Site ◽  
Survival Rates ◽  
High Survival ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Common Guillemot ◽  
Juvenile Mortality ◽  
Close Proximity ◽  
The Baltic

Common Guillemots Uria aalge often breed high up in cliffs, forcing the juveniles to jump down to the beach or sea when leaving their nests. We studied survival of Common Guillemot chicks at time of nest departure on the island Lilla Karlsö in the Baltic Sea. All jumps were conducted either together with one of the parents, or, more commonly, the parent flew down shortly before the chick jumped. At this point, the parent was always found waiting for the chick directly underneath the nest, either on the beach or in the water, and never farther out than five meters if there was no beach below the cliff. If separated, all observed parents and juveniles reunited within one minute and then swam close together out to sea. Juvenile mortality was very low, only 0.5% in 2011, with 2 of 426 chicks dying. In both cases hitting a lower cliff ledge caused the mortality. No case of predation was observed. The high survival rates are most likely due to the chicks’ close proximity to their male parent at all times.

scholarly journals A decrease in fledging body mass in common guillemot Uria aalge chicks in the Baltic Sea

2001 ◽  
Vol 224 ◽  
pp. 305-309 ◽  
Author(s):  
H Österblom ◽  
A Bignert ◽  
T Fransson ◽  
O Olsson
Keyword(s):  
Baltic Sea ◽  
Body Mass ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Common Guillemot ◽  
The Baltic

Bycatches of common guillemot ( Uria aalge ) in the Baltic Sea gillnet fishery

2002 ◽  
Vol 105 (3) ◽  
pp. 309-319 ◽  
Author(s):  
Henrik Österblom ◽  
Thord Fransson ◽  
Olof Olsson
Keyword(s):  
Baltic Sea ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Common Guillemot ◽  
The Baltic

scholarly journals Understanding resource driven female–female competition: ovary and liver size in sand gobies

2019 ◽  
Vol 6 (9) ◽  
pp. 190886 ◽  
Author(s):  
Aurora García-Berro ◽  
Johanna Yliportimo ◽  
Kai Lindström ◽  
Charlotta Kvarnemo
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Nest Site ◽  
Operational Sex Ratio ◽  
Female Competition ◽  
The Baltic Sea ◽  
Nest Sites ◽  
The North ◽  
The North Sea ◽  
The Baltic

The operational sex ratio (OSR, ready-to-mate males to females) is a key factor determining mating competition. A shortage of a resource essential for reproduction of one sex can affect OSR and lead to competition within the opposite sex for resource-holding mates. In the sand goby ( Pomatoschistus minutus ), a fish with paternal care, male readiness to mate depends on acquiring a nest-site, whereas food abundance primarily impacts female egg production. Comparing body condition and gonadal investment of fish from two populations with different availability in resources (Baltic Sea: few nest-sites, more food; North Sea: many nest-sites, less food), we predicted females carrying more mature eggs in the Baltic Sea than in the North Sea. As predicted, ovaries were larger in Baltic Sea females, and so was the liver (storage of energy reserves and vitellogenic compounds) for both sexes, but particularly for females. More females were judged (based on roundness scores) to be ready to spawn in the Baltic Sea. Together with a nest colonization experiment confirming a previously documented difference between the two areas in nest-site availability, these results indicate a more female-biased OSR in the Baltic Sea population, compared to the North Sea, and generates a prediction that female–female competition for mating opportunities is stronger in the Baltic population. To our knowledge, this is the first time that female reproductive investment is discussed in relation to OSR using field data.

Assessment of emerging and traditional halogenated contaminants in Guillemot (Uria aalge) egg from North-Western Europe and the Baltic Sea

2009 ◽  
Vol 407 (13) ◽  
pp. 4174-4183 ◽  
Author(s):  
Hrönn Jörundsdóttir ◽  
Anders Bignert ◽  
Jörundur Svavarsson ◽  
Torgeir Nygård ◽  
Pál Weihe ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Western Europe ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
The Baltic ◽  
North Western

Embryotoxic potential of persistent organic pollutants extracted from tissues of guillemots (Uria aalge) from the Baltic Sea and the Atlantic Ocean

2002 ◽  
Vol 21 (11) ◽  
pp. 2401-2411 ◽  
Author(s):  
Daphne F. De Roode ◽  
M. Bodil Gustavsson ◽  
Anna-lea Rantalainen ◽  
Anette V. Klomp ◽  
Jan H. Koeman ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Baltic Sea ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
The Baltic

Adult survival and avian cholera in Common Guillemots Uria aalge in the Baltic Sea

Ibis ◽  
2004 ◽  
Vol 146 (3) ◽  
pp. 531-534 ◽  
Author(s):  
Henrik Österblom ◽  
Henk P. Van Der Jeugd ◽  
Olof Olsson
Keyword(s):  
Baltic Sea ◽  
Adult Survival ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Avian Cholera ◽  
The Baltic

Multivariate Data Analyses of Chlorinated and Brominated Contaminants and Biological Characteristics in Adult Guillemot (Uria aalge) from the Baltic Sea

2005 ◽  
Vol 39 (22) ◽  
pp. 8630-8637 ◽  
Author(s):  
Katrin Lundstedt-Enkel ◽  
Anna-Karin Johansson ◽  
Mats Tysklind ◽  
Lillemor Asplund ◽  
Kerstin Nylund ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Multivariate Data ◽  
Biological Characteristics ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Data Analyses ◽  
The Baltic

scholarly journals Population trends and status of four seabird species (Uria aalge, Alca torda, Larus fuscus, Larus argentatus) at Stora Karlsö in the Baltic Sea

Ornis Svecica ◽  
2017 ◽  
Vol 27 (2–4) ◽  
Author(s):  
Olof Olsson ◽  
Jonas Hentati-Sundberg
Keyword(s):  
Baltic Sea ◽  
Larus Argentatus ◽  
Herring Gull ◽  
Uria Aalge ◽  
The Baltic Sea ◽  
Alca Torda ◽  
Seabird Species ◽  
Larus Fuscus ◽  
The Baltic ◽  
Annual Decline

The island of Stora Karlsö hosts the largest colonies of fish-eating seabirds in the Baltic Sea. However, recent and reliable estimates of the number of breeding pairs of the main species have been missing. Based on a complete census in 2014, we estimated the number of Common Guillemots Uria aalge to 15,700 pairs, more than half (up to 70%) of the Baltic Sea population. The number has almost tripled since the early 1970s and the increase has been particularly strong the last 11 years, with an annual increase of 5.1%. We counted 24,600 individual adult Razorbills Alca torda and estimated it to correspond to a maximum of 12,300 pairs in 2015–2016 (census over two seasons). The colony has grown strongly; on average by 5.6% annually since the early 1970s, and Stora Karlsö now hosts up to 30% of the Baltic Sea population. Stora Karlsö also hosts colonies with about 300 pairs each of Lesser Black-backed Gull Larus fuscus and Herring Gull Larus argentatus. The gulls’ trends are negative, with an average annual decline the last 10-year period by 5.0% and 6.2%, respectively.

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