Reproductive traits of an estuarine crab, Neohelice (= Chasmagnathus) granulata (Brachyura: Grapsoidea: Varunidae), in two contrasting habitats

被引:16
|
作者
Silva, Paola V. [1 ,2 ]
Luppi, Tomas A. [1 ,2 ]
Spivak, Eduardo D. [1 ,2 ]
Anger, Klaus [3 ]
机构
[1] Univ Nacl Mar del Plata, Fac Ciencias Exactas & Nat, Dept Biol, RA-7600 Mar Del Plata, Buenos Aires, Argentina
[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina
[3] Biol Anstalt Helgoland, Stiftung Alfred Wegener Inst Polar & Meeresforsch, D-27498 Helgoland, Germany
关键词
Neohelice; Chasmagnathus; estuary; fecundity; reproductive effort; egg volume; elemental composition (CHN); BIOCHEMICAL-COMPOSITION; CALLINECTES-SAPIDUS; LATITUDINAL VARIATION; EMBRYONIC-DEVELOPMENT; ELEMENTAL COMPOSITION; MUD CRAB; MACROBRACHIUM-ROSENBERGII; CHEMICAL-COMPOSITION; LARVAL DEVELOPMENT; DEVELOPING EGGS;
D O I
10.3989/scimar.2009.73n1117
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Reproductive traits of an estuarine crab, Neohelice (= Chasmagnathus) granulata (Dana 185 1), were compared between individuals living in contrasting habitats (mudflat and saltmarsh) of the same population in the brackish coastal lagoon of Mar Chiquita, Argentina. In both habitats, most measures of egg biomass decreased during embryogenesis, including total dry weight (DW) and organic matter (measured as ash-free dry weight, AFDW) per egg, the contents of ash, carbon, hydrogen and nitrogen (per egg and as percentage values of DW), the energy content (estimated from C; both per egg and per Dig DW), and the C/N and C/H mass ratios. Egg size, wet weight (WW), and water content (in mu g and % of WW) by contrast, increased significantly during the time of embroynic development. These parameters reached significantly higher final (near-to-hatching) values in mudflats than in saltmarshes (egg volume 0.0249 vs 0.0233 mm(3); WW 36.5 vs 28.8 mu g; water content 30.7 vs 23.2 mu g per egg or 84.2 vs 80.2% of WW, respectively). Fecundity and reproductive effort did not differ significantly between habitats. Habitat-specific differences in the water content and size of crab eggs are discussed in relation to small-scale local variation in environmental conditions.
引用
收藏
页码:117 / 127
页数:11
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