Abstract Two morphologically similar digitate kelp species, Laminaria digitata and Hedophyllum nigripes , co-occur along a shallow sublittoral depth gradient in the Arctic but, contrast to L. very few ecophysiological data exist for H. . We investigated growth, survival, photosynthetic characteristics carbon:nitrogen ratios of juvenile sporophytes, recruitment survival gametophytes genetically ...

Kelp life history pathways alternate between macroscopic sporophytes that produce spores and microscopic gametophytes gametes. Occasionally, an alternative pathway is seen. This study examined the circumstances by which high latitude estuarine bull kelp, Nereocystis luetkeana, foregoes â??free-living stages releasing embryonic directly from sori. Sori were collected adult N. luetkeana eight loc...

Abstract When cultivating the kelp Saccharina latissima , knowledge on availability of seeding material for production is essential. Applying a spore approach requires spores from reproductive organs fertile sporophytes (sori). As sori are generally not present during time in late summer, (sporogenesis) can be artificially induced by removing meristematic part sporophyte and keeping under short...

Thermal characteristics of kelp species have been studied in many ways, but potentially persistent effects temperature across generations are yet poorly understood. In this context, the effect thermal priming on fertility and growth N-Atlantic Laminaria digitata was investigated within life cycle a two-step common garden experiment. Using vegetative clonal gametophytes from cold (5°C) warm (15°...

Thermal tolerance is often interpreted as a species-wide thermal niche in the absence of studies focusing on adaptive potential populations to exhibit differential tolerance. Thus, considering intraspecific plasticity, local adaptation or both between along distributional gradients when interpreting and predicting species responses warming imperative. Removing effect environmental histories by ...