Small-scale variations in mussel (Mytilus spp.) dynamics and local production

被引:23
|
作者
Cusson, M [1 ]
Bourget, E
机构
[1] Univ Laval, Dept Biol, GIROQ, Ste Foy, PQ G1K 7P4, Canada
[2] Univ Sherbrooke, Vice Rectorat Rech, Sherbrooke, PQ J1K 2R1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
secondary production; population dynamics; productivity; small-scale; intertidal; mussel bed;
D O I
10.1016/j.seares.2004.07.005
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
A mussel bed was sampled monthly at four intertidal levels (mid: 2.15; mid-low: 1.65; low: 1.2 and sublittoral fringe: 0.7 m from chart datum) from July 1979 to July 1980 at Pointe-Mitis in the St. Lawrence estuary. A strong spring reduction of abundance (both in density and biomass) suggested that the mussel bed was being degraded. Community perturbation was attributed to ice scour. Partial reestablishment of the mussel bed (all age classes) was observed during late spring and early summer and occurred mainly at the mid-low intertidal level. Changes in the size structure of the mussel bed with level suggest that the annual windstorm regime may be an important factor in the dynamics of the bed. Mean body mass decreased at the three lower shore levels but increased at the highest shore level. Overall, net secondary production (assessed by the increment-summation method) was negative due to the decrease in mean body mass. Annual production rates (kJ m(-2) y(-1)) from the mid intertidal level to the sublittoral fringe were 1130, -4072, -4013 and -3258, respectively, while P/B ratios (y(-1)) were 0.17, -0.69, -0.50 and -0.45. The calculated production and the productivity (potential production) are compared and used to provide insight into the condition of the mussel bed. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:255 / 268
页数:14
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