Marta - world's eldest Common Gull

Common Gull (Larus canus) population studies in Estonia

text by Kalev Rattiste & Peeter Vissak

Flash back! Year 1981 – assassination attempts to Pope John Paul II and president Ronald Reagan, Prince Charles marries Diana Spencer and Marta - one of many Common Gull chicks is hatching in Matsalu National Park, West-Estonia. Now we know her well, as she is the eldest known specimen of the species in the World.

Long-term individual based research of common gulls were initiated in 1962 by Estonian ornithologist Sven Onno. This species was selected as a model one due to its suitability for population studies (high birth rate and breeding site fidelity, insensitivity to human activities in the colony, both partners easily identifiable and catchable etc). The main aim was to study different aspects of  evolutionary ecology, including demography (e.g. reproduc­tive success, age at first breeding, survival, pair bond stability, longevity, birth site fidelity, wintering site fidelity), quantitative genetics and ecophysiology. 

Study area consists of three offshore islets in Matsalu National Park. Main studies are conducted on Kakrarahu islet (3.5 ha; 58º46’ N 23º26’ E). Nowadays, more than 750 pairs are breeding in this colony (all nests are marked and numbered). All breeders are ringed both with metal (Estonia Matsalu ringing scheme) and plastic ring (white rings with four alphanumerics, starting always with letter P, e.g. P3H9, P27K). Every year at least 95 per cent of breeders are identified and all hatched chicks are ringed in their first day of life. By everyday inspections laying time and weight of eggs, as well as hatching time of chicks are recorded.

In non-breeding period, many bird watchers observe these common gulls in their post-breeding wandering range, migration routes or wintering grounds. For example, in 2013-2015 there were 308 such notifications. Most often our common gulls are met in the Netherlands (42% of observations), Germany (26%), Denmark (18%) and Poland (4%), but also in Belgium, UK, Latvia, France, Sweden, Russia, Lituania, Czech Republic and Hungary, If you see an Estonian common gull, please inform Estonian Ringing Centre (matsalu@envir.ee) or directly our study group (kalev.rattiste@gmail.com).

Marta and Oskar in 2012 / Source: laanlane.ee

As a rule, only ten per cent of offspring reach sexual maturity and start to breed. On average common gulls breed for five-six years. Marta, the oldest known common gull in the world was breeding in Kakrarahu colony in 2015. She has born in Kakrarahu colony on 3rd of June 1981 and is now 34 years old. Her father was also born and bred in this colony (1973-1989), as well as her grandfather and grandmother (bred in 1966-1980). Marta’s first and second  partnerships lasted seven and one year, respectively. The second partner returned to his previous partner, who missed the 1994 breeding season. Since 1995 Marta is breeding with Oskar (for 21 years now!), who is eight years younger (born in 1989). Altogether Marta has laid 86 eggs and 59 chicks have hatched. For now, her ten children (6 males and 4 females), eleven grandchildren (6 males and 5 females) and three grandgrandchildren (all males) have returned to breed in Kakrarahu colony. Marta is wintering on the River Severn at Purton, England (51º44’ N 2º26’ W).