Salmon

Beaver in tidal marshes: Dam effects on low-tide channel pools and fish use of estuarine habitat

by Greg Hood

Beaver (Castor spp.) are considered a riverine or
lacustrine animal, but surveys of tidal channels in the... more Beaver (Castor spp.) are considered a riverine or
lacustrine animal, but surveys of tidal channels in the Skagit
Delta (Washington, USA) found beaver dams and lodges in the
tidal shrub zone at densities equal or greater than in non-tidal
rivers. Dams were typically flooded by a meter or more during
high tide, but at low tide they impounded water, allowing
beaver to swim freely while quadrupling pool habitat for fish
compared to channels without dams. Seven fish species were
caught in low-tide pools, including threatened juvenile Chinook
salmon (Oncorhynchus tshawytscha), whose densities (by
volume) averaged 3.2 times higher in low-tide pools than
shallows. Accounting for the total contribution of pools and
shallows to juvenile Chinook abundance, beaver pools tripled
shrub zone channel capacity for juvenile Chinook salmon at
low tide relative to herbaceous zone marsh without beaver
pools. Current Chinook recovery efforts focus on restoring
herbaceous zone tidal marsh for rearing juveniles, but this
focus overlooks presently rare and poorly understood habitat,
like tidal shrub marsh, that was historically common and
likely important to beaver and small estuarine or anadromous
fish.

Fishing with Monks - Padise Abbey and the River Vantaanjoki from 1351 to 1429.

by Tapio Salminen

Published in: Marjo Poutanen (Ed.), Colonists on the Shores of the Gulf of Finland: Medieval Settlement in the Coastal Regions of Estonia and Finland. Vantaa City Museum Publications, 22. Vantaan Kaupunginmuseo, Lahti 2011, p. 37-64.

The paper discusses the role of Cistercian economic activity in late 14th century and early 15th Century region of... more The paper discusses the role of Cistercian economic activity in late 14th century and early 15th Century region of Nyland (Uusimaa) in Southern Finland. How did the Cistercian Abbey of Padise (Ger. Padis) in Estonia first come into possession of fishing rights for salmon in the River Vantaanjoki in Finland, and what was the significance of these rights for the economy and everyday life of the monastery during the period of the abbey's donation in 1351–1429? What impact did the monks and lay brethren have on the use of the river and the structure of settlement in its area, now in the dense suburban network of Vantaa and Helsinki?

Obituary. William Crozier Jordan (Bill) 1962-2011

by Carlos Garcia de Leaniz

Garcia de Leaniz, C. (2011). Journal of Fish Biology 79: 1089-1083
doi:10.1111/j.1095-8649.2011.03119.x

Buying power in UK retail chains: A residual supply approach

by Sigbjorn Tveteras