Densité et mobilité des poissons sous la glace, sur une zone de pêche à la senne de deux lacs finlandais, par écho-intégration.

Jurvelius, Juha; Lilja, Juha; Hirvonen, Esa; Riikonen, Raimo; Marjomäki, Timo J.

doi:10.1016/s0990-7440(00)01061-5

Cited by 9 publications

(1 citation statement)

References 12 publications

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“…The timing of seal haulouts may be dependent on prey behaviour and foraging strategies (Sjöberg et al 1999, Andrews-Goff et al 2010. In Saimaa, the typical pelagic prey fish, such as smelt Osmerus eperlanus and vendace Coregonus albula (Kunnasranta et al 1999), have been shown to disperse at night in surface layers and school near the bottom during daylight (Jurvelius et al 1988(Jurvelius et al , 2000. Therefore, the vertical distribution of prey species may partly explain the circadian haulout behaviour patterns of the seals.…”

Section: Discussionmentioning

confidence: 99%

Haulout patterns of Saimaa ringed seals and their response to boat traffic during the moulting season

Niemi¹,

Auttila²,

Valtonen³

et al. 2013

Endang. Species. Res.

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Conservation of the Critically Endangered ringed seal Phoca hispida saimensis population in Lake Saimaa in Finland requires broader knowledge of the behavioural ecology of this subspecies. Understanding Saimaa ringed seal haulout patterns and their response to boat traffic is crucial for designing sustainable land use and tourism guidelines. Responses of unidentified seals to small outboard motor boat traffic were studied during the moulting season. The median distance at which the seals responded to an approaching boat was 240 m. GPS-phone tags were used to study both circadian and seasonal haulout behaviour patterns of individual seals (n = 8) during the open-water season. The average post-moulting haulout duration was 6 ± 5 h (SD), with a maximum of over 26 h. The seals spent more time hauled out at night (between 21:00 and 06:00 h) after the moult. The time spent hauled out and the haulout frequency declined from early summer to autumn. An individual seal had an average of 13 haulout sites, which were an average of 2.5 km apart. Approximately half of these haulout sites were located in the core 50% of the individual seals' home ranges. The high level of site fidelity emphasizes the need to identify suitable haulout areas and to develop measures for protecting the main resting sites of this endangered population. Additionally, guidelines for seal watching should be developed in order to mitigate the potential disturbance caused by increasing tourism on Lake Saimaa.

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Section: Discussionmentioning

confidence: 99%