The conquest of fresh water by the palaemonid shrimps: an evolutionary history scripted in the osmoregulatory epithelia of the gills and antennal glands

Author(s)

McNamara, John Campbell ^{[1, 2]} ; Freire, Carolina Arruda ^[3] ; Torres, Jr., Antonio Hernandes ^[1] ; Faria, Samuel Coelho ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Biol, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Ctr Biol Marinha, BR-11600000 Sao Sebastiao, SP - Brazil

^[3] Univ Fed Parana, Dept Fisiol, Setor Ciencias Biol, BR-81531990 Curitiba, Parana - Brazil

• Document type: Journal article
• Source: Biological Journal of the Linnean Society; v. 114, n. 3, p. 673-688, MAR 2015.
• Web of Science Citations: 16

Abstract

Extant Palaemonidae occupy aquatic environments that have generated physiological diversity during their evolutionary history. We analyze ultrastructural traits in gills and antennal glands of palaemonid species from distinct osmotic niches, and employ phylogenetic comparative methods to ascertain whether transformations in their osmoregulatory epithelia have evolved in tandem, driven by salinity. Gill pillar cells exhibit apical evaginations whose surface density (S-v, m(2) plasma membrane area/m(3) cytoplasmic volume) ranges from 6.3-7.1 in Palaemon, and 0.7-38.4 in Macrobrachium. In the septal cells, S-v varies from 8.9-10.0 in Palaemon, and 3.3-21.6 in Macrobrachium; mitochondrial volumes (V-mit) range from 43.3-46.8% in Palaemon and 34.9-53.4% in Macrobrachium. In the renal proximal tubule cells, apical microvilli S-v varies from 27.0-34.3 in Palaemon, and 38.3-47.8 in Macrobrachium; basal invagination S-v ranges from 18.7-20.0 in Palaemon and 30.8-40.8 in Macrobrachium. Septal cell S-v shows phylogenetic signal; evagination height/density, apical S-v, and V-mit vary independently of species relatedness. Salt transport capability by the gill and renal epithelia has increased during palaemonid evolution, reflecting amplified membrane availability for ion transporter insertion. These traits underpin the increased osmotic gradients maintained against the external media. Gill ultrastructure and osmotic gradient have evolved in tandem, driven by salinity at the genus level.(c) 2015 The Linnean Society of London, Biological Journal of the Linnean Society, 2015, 114, 673-688. (AU)

• FAPESP's process: 11/08852-0 - The evolutionary history of thermal and metabolic homeostasis in a clade of neotropical, intertidal crabs (Decapoda, Eubrachyura)
• Grantee: Samuel Coelho de Faria
• Support Opportunities: Scholarships in Brazil - Doctorate