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RISS 인기검색어
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- 저자 : Özvarol Yaşar (검색결과 2 건)
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Seasonal Growth Dynamics of Posidonia oceanica in a Pristine Mediterranean Gulf
Erhan Mutlu,Cansu Olguner,Mehmet Gökoğlu,Yaşar Özvarol 한국해양과학기술원 2022 Ocean science journal Vol.57 No.3
Seasonal growth dynamics and ecology of Posidonia oceanica were studied in a space alongshore a pristine Mediterranean gulf in 2011–2012. About one-third of the present study surface area was occupied meadows where only calcite rocks were found on bottoms between 0.5 and 29 m. Shoot density was not significantly different among seasons, and was above 364 ± 27 shoots m−2, but was different among the depths. The density variables decreased along the bottom depth gradient along which the number of leaves per shoot, inter shoot distance and the morphometrical variables tended to increase. Inferring the dynamics of biometrics (length and width of leaf, orthotropic rhizomes and leaf sheath) and density (LAI, leaf biomass and the number of leaves per shoot), the biometrics of the meadow grew seasonally between growth by March and mortality by August–September, regardless of the coverage area. Mortality occurred due to the highest annual salinity in late summer. A transition depth in space and month in time was assessed as 15 m and as August for variation of the biometrics, respectively. Rhizome related-biometrics (length, thickness, weight, sheath length and width) were dynamically initialized mainly by water nitrogen content which was high by winter-spring. A PAR in the range of 10–32%, and surface water temperature up to 28.8–29.3 °C corresponding to up to ~ 40 PSU were critical limiting factors for P. oceanica to survive in space. Water physics, chemistry, and optical properties governed the annual course of biometrics. Total organic carbon was also negatively affecting the seasonal dynamics of the rhizome.
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Mutlu Erhan,Duman Güler Sıla,Karaca Doğukan,Özvarol Yaşar,Şahin Ahmet 한국해양과학기술원 2023 Ocean science journal Vol.58 No.1
The biometrical dynamics of Posidonia oceanica were studied with regard to variation and its depthwise extension with four major bottom types along the entire Turkish Mediterranean coasts in winter and summer during 2019. The bottom type which mainly consisted of rock, matte (hard bottom), sand, and mud (soft bottom) was a key determinant for biometrical (density and morphometric) changes which were more prominent in summer. The upper and lower limits of vertical depthwise extension of the meadows were restricted by the zonal distribution of the hard bottom. The limits were not restricted on the soft bottom. However, some large areas of the soft bottoms were devoid of the meadows depending on the existence of mobile substrate affected by the high dynamic of water movement. The density variables were higher on hard bottoms than on the soft bottoms; the inter-nodal distance was longer on matte than on rock, sand, and mud, in contrast to leaf biomass. Mud had the lowest number of leaves per shoot and shoot density, whereas rock had the highest number. The shortest rhizome was measured on the rock, while the longest rhizome was measured on matte, which also had the longest leaves. The soft bottoms had wider leaves than the hard bottoms had. Besides the seasonal and depthwise differences in the biometrics, the biometrics were separately assembled between rock and mud. Contrary to the morphometric variables, the density biometrics decreased linearly from the hard bottom to the soft bottom.
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