Complex haploid‐diploid life cycles amongst marine organisms may be maintained by ecological differences in life‐history phases. For red algal species within the Gigartinaceae, such differences may be driven, in part, by different cell wall composition and resultant biomechanical strengths of haploid and diploid phases. A field experiment tested the attachment strengths of gametophytes and tetrasporophytes of the isomorphic red alga, Chondrus verrucosus (with comparisons of fertile and vegetative fronds, with and without natural tissue damage across three wave‐exposed sites). Seventy‐nine percent of all fronds broke at the stipe‐holdfast junction. There were significant differences in attachment strength (break force and break stress), but not gross morphology (frond length, number of branch axes, wet weight and cross‐sectional area of fronds that dislodged at the stipe‐holdfast junction) of life‐history phases, with tetrasporophytes exhibiting weaker tissue strength and attachment, and therefore greater susceptibility to dislodgement by waves. However, fertility and tissue damage did not consistently influence dislodgement in pull‐to‐break tests simulating the effects of single waves. The ecological and evolutionary consequences of greater susceptibility to dislodgement of tetrasporophytes (relative to gametophytes) warrant further investigation.

中文翻译：

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潮间带同构红藻的不同生活史阶段的附着强度不同

海洋生物中复杂的单倍体-二倍体生命周期可能通过生命历史阶段的生态差异来维持。对于 Gigartinaceae 内的红藻物种，这种差异可能部分是由不同的细胞壁组成以及由此产生的单倍体和二倍体相的生物力学强度造成的。一项田间试验测试了同构红藻 Chondrus verrucosus 配子体和四孢子体的附着强度（比较了可育和营养叶，在三个波浪暴露点有和没有自然组织损伤）。79% 的叶子在菌柄固定连接处断裂。附着强度（断裂力和断裂应力）存在显着差异，但总体形态（叶长、分枝轴数、叶的湿重和横截面积在生命历史阶段的叶柄固定连接处脱落，四孢子体表现出较弱的组织强度和附着力，因此更容易被波浪移动。然而，在模拟单波效应的拉断试验中，生育力和组织损伤并没有持续影响移位。四孢子体（相对于配子体）更易脱落的生态和进化后果值得进一步研究。在模拟单波效应的拉断试验中，生育力和组织损伤并没有持续影响移位。四孢子体（相对于配子体）更易脱落的生态和进化后果值得进一步研究。在模拟单波效应的拉断试验中，生育力和组织损伤并没有持续影响移位。四孢子体（相对于配子体）更易脱落的生态和进化后果值得进一步研究。