#brown algae

[snototter]

Southern bull kelp (Durvillaea sp.) in Antarctica

by John Turnbull

[jadafitch]

Winged kelp, one of many dozen seaweed illustrations I painted last winter for Tasha Greenwood’s Edible & Medicinal Seaweeds: A Guide to Healing & Nutritive Ocean Plants, published by Storey. Out January 20th and available to preorder now.

[mindblowingscience]

Brown algae genomes reveal ancient origins and evolutionary fate of sex chromosomes

By tracing the genomes of nine brown algal species, researchers have shed light on the ancient origins, remarkable stability, and unexpected

Sex determination is a cornerstone of biology, yet many mysteries remain about how sex chromosomes evolve, especially outside familiar mammal and bird systems. Unlike mammals, where sex is set at fertilization by XX/XY chromosomes, brown algae determine sex during spore formation based on U (female) or V (male) sex chromosomes. Despite their importance, the rise, evolution, and demise of U/V sex chromosomes have remained an enigma. This new research, published in Nature Ecology & Evolution, demonstrates that these specialized sex chromosomes arose between 450 and 224 million years ago. A key finding is the identification of a pivotal male-determining gene, MIN, as well as six other core sex-linked genes, which have astonishingly remained almost unchanged across these vast evolutionary timescales.

Continue Reading.

[wild-e-eep]

Lichen-shaped, but in a rock pool. Looks like Pseudoralfsia verrucosa, a kind of brown seaweed with a crustose growth habit.

iNaturalist observation 282826659

[autistrix]

[https://www.inaturalist.org/observations/63171461] Sliminess of the Skin || Trichodina domerguei Observed in France No Conservation Status

[segmentedleg]

Sargassum natans (brown algae) (San Salvador Island, Bahamas) 2

[photo-biont]

[pulsethebabyoctopus]

Algae of California (a tidepooling collection)

Surfgrass (Phyllospadix)

Sea Palm (Postelsia palmiformis)

Turkish Towel or close relative (Chondrocanthus)

CCA - Common Corraline? (Corallina officinalis)

The green genus that shows up everywhere (Cladophora)

Mystery red with potential carpospores

Iridescent algae? (Mazzaella)

Somebody red (Callophyllis)

Mystery red I’ve got no clue

My friend I love you - Dense Sea Fern (Neoptilosa Densa)