High survival and growth rates of introduced Pacific oysters may cause restrictions on habitat use by native mussels in the Wadden Sea

2006 ◽  
Vol 328 (2) ◽  
pp. 211-227 ◽  
Author(s):  
Susanne Diederich
Keyword(s):  
Habitat Use ◽  
Growth Rates ◽  
Wadden Sea ◽  
High Survival ◽  
Pacific Oysters ◽  
Survival And Growth ◽  
Native Mussels

Dynamics and Growth of a Recent Invader into European Coastal Waters: the American Razor Clam, Ensis Directus

1995 ◽  
Vol 75 (2) ◽  
pp. 351-362 ◽  
Author(s):  
J.J. Beukema ◽  
R. Dekker
Keyword(s):  
Growth Rates ◽  
Wadden Sea ◽  
High Survival ◽  
Sediment Types ◽  
Production Values ◽  
Wide Range ◽  
Dominant Member ◽  
Shallow Subtidal ◽  
Lower Intertidal Zone ◽  
One Year

Densities and growth rates of Ensis directus (Bivalvia: Solenidae), a recent invader of the Wadden Sea, were monitored at 15 stations (12 transects and 3 squares) covering a wide range of intertidal levels and sediment types on Balgzand, a tidal-flat area in the western-most part of the Wadden Sea, during 1982–1994. In this period, recruitment was weak in all but one year (1991). Settlement took place in summer over a wide range of intertidal levels, but high survival of recruits was limited to stations below the level of mean low tides. Growth rates were also maximal at these low intertidal levels. In such areas they reached a mean length of about 6 cm in the first winter, about 12 cm in the second, and about 14 cm in the third winter. These growth rates were high compared with published records from other intertidal and shallow subtidal areas.Relatively exposed parts of the lower intertidal zone, characterized by clean sands and infrequent emersion, are a poorly occupied habitat of the Wadden Sea and offer an available niche to a new species that is well adapted to such harsh environmental conditions. In such areas, E. directus has become a dominant member of the benthos and in 1992 and 1993 reached high biomass and production values of >10 g AFDW m−2.

Survival and growth rates of transplanted Scleractinian corals on the reef flat at Kalasei Waters, Minahasa Regency, North Sulawesi

2013 ◽  
Vol 1 (2) ◽  
pp. 111
Author(s):  
Hanny Tioho ◽  
Carolus P Paruntu ◽  
Hendra Patrich
Keyword(s):  
Growth Rates ◽  
Growth Form ◽  
Coral Species ◽  
Slow Growth ◽  
High Survival ◽  
Live Coral ◽  
High Survival Rate ◽  
Dead Coral ◽  
North Sulawesi ◽  
Survival And Growth

In order to know survival and growth rates of some scleractinian coral species, 538 colonies from 46 species were collected from the reef which was affected by reclamation activity and transferred to the adjacent reef about 300 meters from the former location.  All of the transplanted colonies were observed during 12 months (April 2011 – March 2012).   We found that 47 (8.74%) dead coral colonies dominated by branching corals and 491 (91.26%) were dominated by live coral colonies of the growth forms encrusting, folioseandmassive.  The highest coral growth (10.59 to 11.32cm/year) was showed by branching Acropora, while the lowest (0.35 to 0.71 cm/year ) was showed by the group of massive-submassive growth form.  This study concluded that corals with encrusting, folioseandmassive growth formhad a high survival rate, but they have slow growth ratescompared withbranching growth form. Untuk mengetahui tingkat ketahanan hidup dan pertumbuhan karang Scleractinia,  46 jenis karang Scleractinia yang terdiri dari 538 koloni dikoleksi dari areal terumbu karang yang sementara direklamasi dan ditransplantasi ke area rataan terumbu yang berjarak sekitar 300 meter dari area aktivitas reklamasi di pantai Kalasey dan pengamatan dilakukan selama satu tahun (April 2011 - Maret 2012).  Ditemukan 47 (8,74 %) koloni karang yang mati dan didominasi oleh karang bercabang, dan 491 (91,26 %) koloni yang hidup didominasi oleh karang dengan bentuk pertumbuhan encrusting, foliose dan massive. Pertumbuhan karang tertinggi adalah karang bercabang dari kelompok Acropora yaitu 10,59 - 11,32 cm/Tahun, sedangkan terendah adalah kelompok dengan bentuk pertumbuhan massive-submassive yaitu 0,35 - 0,71 cm/Tahun. Penelitian ini memperlihatkan bahwa karang dengan bentuk pertumbuhan encrusting, foliose dan massive memiliki tingkat ketahanan hidup yang lebih tinggi, tetapi memiliki pertumbuhan yang lebih lambat dibandingkan dengan karang bercabang.

Survival and growth of understory trees in oak forests of the Hudson Highlands, New York

1981 ◽  
Vol 11 (3) ◽  
pp. 689-695 ◽  
Author(s):  
Craig G. Lorimer
Keyword(s):  
New York ◽  
Growth Rates ◽  
Red Oak ◽  
Northern Red Oak ◽  
Average Growth Rate ◽  
Average Growth ◽  
Red Oaks ◽  
Oak Trees ◽  
Survival And Growth ◽  
Understory Trees

Mortality and growth rates of trees in various crown classes and size classes were analyzed from 40-year permanent plot records of slope and ravine forest dominated by chestnut oak (Quercusprinus L.) and northern red oak (Quercusrubra L.). Average 5-year mortality rates for suppressed trees ≥2.5 cm dbh of chestnut oak and red oak in the slope forest were 26 and 45%, respectively. None of the suppressed red oaks survived the 40-year period, compared with 14% of the chestnut oaks and 33% of the red maples (Acerrubrum L.). Mortality of oak trees in the intermediate crown class was less than half that of suppressed trees, but still much higher than that of maples and birches on the tracts. Survival was reasonably high for oaks as long as the top of the crown was receiving direct sunlight, but the expected 40-year survival rate of red oaks in such a position is only 20%, with an average growth rate of 1.0 mm in diameter per year. Curves and equations expressing average mortality and growth rates at various levels of competition are presented for each species.

scholarly journals Feasibility study on culturing Pacific oysters in the Wadden Sea of Schleswig-Holstein

2017 ◽  
Author(s):  
Jakob Capelle ◽  
◽  
Pauline Kamermans ◽  
◽  
Keyword(s):  
Feasibility Study ◽  
Wadden Sea ◽  
Pacific Oysters

The production characteristics of the indigenous Imroz and Kivircik sheep breeds in Turkey

2004 ◽  
Vol 34 ◽  
pp. 57-66 ◽  
Author(s):  
A. Yilmaz ◽  
M. Ozcan ◽  
B. Ekiz ◽  
A. Ceyhan ◽  
A. Altine
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Milk Production ◽  
Growth Rates ◽  
Survival Rates ◽  
Growth Characteristics ◽  
Marmara Region ◽  
Sheep Breeds ◽  
Survival And Growth ◽  
Production Characteristics

SummaryThis study was carried out to investigate the fertility, milk production and body weight of ewes and the survival and growth characteristics of lambs of the indigenous Imroz and Kivircik sheep breeds. The Imroz and Kivircik sheep breeds are included among the genetic resources in the project for the conservation of the indigenous breeds in Turkey.Conception rates for Imroz and Kivircik ewes were 57.6% and 81.7% respectively, litter sizes were 1.2 and 1.2 respectively, milk yields were 89 kg and 62 kg respectively and average live weights (2–7 years of age) were 43 kg and 55 kg, respectively. Imroz and Kivircik lambs had survival rates at weaning (90th day) of 98% and 96%, birth weights of 3.3 kg and 4.1 kg and weaning weights of 19.8 kg and 28.0 kg, respectively.The results showed that the Kivircik sheep were heavier and the lambs had a better growth rate until weaning than the Imroz breed. However, the milk production of the Imroz ewes was higher than that of Kivircik. The lambs of both breeds had a satisfactory survival and growth rates until weaning and these results might be regarded as a desired adaptation of the Imroz and Kivircik lambs to the environmental conditions of the Marmara Region.

scholarly journals High mortality of Pacific oysters in a cold winter in the North-Frisian Wadden Sea

2011 ◽  
Vol 65 (4) ◽  
pp. 525-532 ◽  
Author(s):  
Heike Büttger ◽  
Georg Nehls ◽  
Sophia Witte
Keyword(s):  
High Mortality ◽  
Wadden Sea ◽  
Cold Winter ◽  
The North ◽  
Pacific Oysters ◽  
North Frisian

Effect of time of joining and rate of stocking on the production of Corriedale ewes in southern Victoria. 2. Survival and growth of lambs

1974 ◽  
Vol 14 (69) ◽  
pp. 434 ◽  
Author(s):  
PA Kenney ◽  
IF Davis
Keyword(s):  
Growth Rate ◽  
Birth Weight ◽  
Milk Production ◽  
Growth Rates ◽  
Stocking Rate ◽  
Survival And Growth ◽  
Single Birth

A study of the survival and growth of lambs was made over a three year period (1968 to 1970) on a flock of 540 ewes grazing annual pasture at Werribee, Victoria. Ewes were stocked at three rates (5, 7 1/2 and 10 ha-1) and lambed between July 6 and August 20 or between September 10 and October 29 each year. Observations were made on the same ewes each year. Rate of stocking had no effect on the birth weight of lambs but single-birth lambs born in September were lighter than those born in July. More twins were born in September than in July and a smaller proportion of lambs born survived from the September than from the July lambing. Of the lambs born to ewes stocked at 10 ha-1 in 1968 and 1969 a smaller proportion survived than of the lambs born to ewes stocked at 5 ha-1. The growth rate of lambs born in July was constant between birth and weaning at 12 weeks of age but declined as rates of stocking increased. When the lambs born in September were about eight weeks old the pastures matured and growth rates of lambs declined and at weaning liveweights of lambs from plots stocked at different rates were similar. Lambs born in July on plots stocked at 5 and 79 ewes ha-1 were as much as eight kilograms heavier at weaning than the lambs born in September at equivalent rates of stocking. Neither rate nor time of onset of milk production was significantly affected by stocking rate.

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