Relationships between egg size and maternal size, life-history forms, and habitats of Greenlandic Arctic charr (Salvelinus alpinus)

Arctic charr (Salvelinus alpinus [L.] complex) has been widely used as a model system for studies in evolutionary ecology because of its diversity in feeding ecology, habitat use, life-history forms, and associated morphologies observed in matured individuals. However, we still know relatively little about traits exhibited early in life of the species, although the trait diversity of matured individuals may largely be shaped during development. Egg size is a key determinant ofvarious traits exhibited early in life. Therefore, describing egg size variation within- and between-individuals as well as the link between egg size and adult traits will be a useful step in understanding the early life trait diversity of Arctic charr. Here, using Greenlandic Arctic charr, which includes alternative life-history forms (i.e., anadromous and resident) and spawning habitat use (i.e., lake- and river- spawner), we described egg size variation (i.e., clutch-mean egg diameter and within-clutch variation..., ,

北极红点鲑（Salvelinus alpinus [L.]复合类群）因成熟个体在摄食生态、栖息地利用、生活史类型及相关形态特征上的多样性，被广泛用作进化生态学研究的模式系统。然而，尽管成熟个体的性状多样性很大程度上可能在发育过程中塑造，但我们对该物种早期生活阶段所表现出的性状仍了解相对较少。卵大小是早期生活阶段多种性状的关键决定因素。因此，描述个体内与个体间的卵大小变异，以及卵大小与成体性状之间的关联，将是理解北极红点鲑早期生活性状多样性的重要一步。本研究以格陵兰北极红点鲑为研究对象，该类群包含两种不同的生活史类型（即溯河洄游型与定居型）以及两种产卵栖息地利用模式（即湖泊产卵者与河流产卵者），我们对其卵大小变异（即窝平均卵径及窝内变异……）