Predicting egg size across temperatures in marine teleost fishes

2020 ◽  
Vol 21 (5) ◽  
pp. 1027-1033
Author(s):  
David M. Anderson ◽  
James F. Gillooly
Keyword(s):  
Egg Size ◽  
Teleost Fishes ◽  
Marine Teleost

scholarly journals Sulfate transporters involved in sulfate secretion in the kidney are localized in the renal proximal tubule II of the elephant fish (Callorhinchus milii)

2016 ◽  
Vol 311 (1) ◽  
pp. R66-R78 ◽  
Author(s):  
Kumi Hasegawa ◽  
Akira Kato ◽  
Taro Watanabe ◽  
Wataru Takagi ◽  
Michael F. Romero ◽  
...  
Keyword(s):  
Xenopus Oocytes ◽  
Narrow Range ◽  
Teleost Fishes ◽  
Marine Teleost ◽  
Cdna Sequences ◽  
Solute Carrier ◽  
Cartilaginous Fishes ◽  
Underlying Mechanisms ◽  
Functional Analyses

Most vertebrates, including cartilaginous fishes, maintain their plasma SO42− concentration ([SO42−]) within a narrow range of 0.2–1 mM. As seawater has a [SO42−] about 40 times higher than that of the plasma, SO42− excretion is the major role of kidneys in marine teleost fishes. It has been suggested that cartilaginous fishes also excrete excess SO42− via the kidney. However, little is known about the underlying mechanisms for SO42− transport in cartilaginous fish, largely due to the extraordinarily elaborate four-loop configuration of the nephron, which consists of at least 10 morphologically distinguishable segments. In the present study, we determined cDNA sequences from the kidney of holocephalan elephant fish ( Callorhinchus milii) that encoded solute carrier family 26 member 1 (Slc26a1) and member 6 (Slc26a6), which are SO42− transporters that are expressed in mammalian and teleost kidneys. Elephant fish Slc26a1 (cmSlc26a1) and cmSlc26a6 mRNAs were coexpressed in the proximal II (PII) segment of the nephron, which comprises the second loop in the sinus zone. Functional analyses using Xenopus oocytes and the results of immunohistochemistry revealed that cmSlc26a1 is a basolaterally located electroneutral SO42− transporter, while cmSlc26a6 is an apically located, electrogenic Cl−/SO42− exchanger. In addition, we found that both cmSlc26a1 and cmSlc26a6 were abundantly expressed in the kidney of embryos; SO42− was concentrated in a bladder-like structure of elephant fish embryos. Our results demonstrated that the PII segment of the nephron contributes to the secretion of excess SO42− by the kidney of elephant fish. Possible mechanisms for SO42− secretion in the PII segment are discussed.

scholarly journals Body shape diversification along the benthic–pelagic axis in marine fishes

2020 ◽  
Vol 287 (1931) ◽  
pp. 20201053
Author(s):  
S. T. Friedman ◽  
S. A. Price ◽  
K. A. Corn ◽  
O. Larouche ◽  
C. M. Martinez ◽  
...  
Keyword(s):  
Body Shape ◽  
Marine Fishes ◽  
Shape Evolution ◽  
Teleost Fishes ◽  
Marine Teleost ◽  
Linear Measurements ◽  
Body Shapes ◽  
Average Body ◽  
High Diversity ◽  
Phenotypic Responses

Colonization of novel habitats can result in marked phenotypic responses to the new environment that include changes in body shape and opportunities for further morphological diversification. Fishes have repeatedly transitioned along the benthic–pelagic axis, with varying degrees of association with the substrate. Previous work focusing on individual lineages shows that these transitions are accompanied by highly predictable changes in body form. Here, we generalize expectations drawn from this literature to study the effects of habitat on body shape diversification across 3344 marine teleost fishes. We compare rates and patterns of evolution in eight linear measurements of body shape among fishes that live in pelagic, demersal and benthic habitats. While average body shape differs between habitats, these differences are subtle compared with the high diversity of shapes found within each habitat. Benthic living increases the rate of body shape evolution and has led to numerous lineages evolving extreme body shapes, including both exceptionally wide bodies and highly elongate, eel-like forms. By contrast, we find that benthic living is associated with the slowest diversification of structures associated with feeding. Though we find that habitat can serve as an impetus for predictable trait changes, we also highlight the diversity of responses in marine teleosts to opportunities presented by major habitats.

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