In marine systems, a longer PLD is thought to be advantageous for colonizing
new habitats, and marine larvae often spend 30–60 days in the water
column [1,4–6]. However, the unidirectional flow characterizing many freshwater
systems could readily cause pelagic fish larvae to be swept
downstream from suitable habitats [7]. This could be why freshwater fish
often have a short or completely lack a pelagic larval stage [1,8]. Because
elevation gradients structure flow regimes in freshwater systems, these
gradients could shape the evolution of PLD in freshwater organisms. If a freshwater
group showed substantial variation in PLD length and had evolved to
exploit a range of stream gradients, phylogenetic comparative methods could
be used to test whether increased gradients are linked to the evolution of
shorter PLD.
In marine systems, a longer PLD is thought to be advantageous for colonizingnew habitats, and marine larvae often spend 30–60 days in the watercolumn [1,4–6]. However, the unidirectional flow characterizing many freshwatersystems could readily cause pelagic fish larvae to be sweptdownstream from suitable habitats [7]. This could be why freshwater fishoften have a short or completely lack a pelagic larval stage [1,8]. Becauseelevation gradients structure flow regimes in freshwater systems, thesegradients could shape the evolution of PLD in freshwater organisms. If a freshwatergroup showed substantial variation in PLD length and had evolved toexploit a range of stream gradients, phylogenetic comparative methods couldbe used to test whether increased gradients are linked to the evolution ofshorter PLD.
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