Experimental set-up of the binary choice experiment in the laboratory (metric unit: mm).

<p>Experimental set-up of the binary choice experiment in the laboratory (metric unit: mm).</p

Study site at Turtle Island (Kueishan Tao), red spot represents the location of the hydrothermal vent site.

<p>Study site at Turtle Island (Kueishan Tao), red spot represents the location of the hydrothermal vent site.</p

Binary choice of naive male <i>Xenograpsus testudinatus</i> in a binary-choice test tank.

<p><b>Response of initial selection and final selection.</b> Numbers represent the percentage of selection behavior. * is <i>p</i> < 0.05; ** is <i>p</i> < 0.01; *** is <i>p</i> < 0.001.</p

Average crab larval numbers at three depths: 1, 6, 12-15m.

<p>Average crab larval numbers at three depths: 1, 6, 12-15m.</p

Binary choice of naive female <i>Xenograpsus testudinatus</i> in a binary-choice test.

<p><b>Response of initial selection and final selection.</b> Numbers represent the percentage of selection behavior. * is <i>p</i> < 0.05; ** is <i>p</i> < 0.01; *** is <i>p</i> < 0.001.</p

Are vent crab behavioral preferences adaptations for habitat choice? - Fig 2

<p><b>Abundance variations of 4 replicate collections for crab larvae distribution in three depths:</b> 0–1 m (a), 6 m (b) and 12–15 m (c).</p

Effect of Cd on lipid digestion, lipid transport and lipid synthesis of <i>Sinopotamon henanense</i>.

<p>Activity of pancreatic lipase (PL, a), lipoprotein lipase (LPL, b) fatty acid synthase (FAS) in the hepatopancreas (c) and ovary (d) and acyl-CoA carboxylase (ACC) activity in the hepatopancreas (e) and ovary (f) of control and exposed crabs after 10, 15 and 20 days of experimentation. Comparison between the control and treatment groups is notified as * <i>p</i> < 0.05.</p

Cadmium concentrations in the tissues of control and exposed crabs.

<p>Data of hepatopancreas (a) and ovary (b) are expressed as mean ± standard deviation (n = 5). Statistical significance is denoted by * <i>p</i> < 0.05 compared to the respective control.</p

Effect of different Cd concentrations on ATP levels and dependent enzyme activities.

<p>Data are expressed as mean ± standard deviation (n = 5). Comparison between the control and treatment groups is notified as * <i>p</i> < 0.05. ATP levels: (hepatopancreas, a; ovary, b), Glucokinase (GK: hepatopancreas, c; ovary, d), NAD⁺-linked isocitrate dehydrogenase (IDH: hepatopancreas, e; ovary, f), and cytochrome C oxidase (COX: hepatopancreas, g; ovary, h).</p

Effects of Cd on ovarian index, hepatopancreatic index, triglyceride and lipid content.

<p>Ovarian index (a), hepatopancreatic index (b), triglyceride levels in hemolymph (e) and lipid content expressed as percentage (weight of lipid/ tissue samples, FW: fresh weight) in the ovary (c) and hepatopancreas (d) for control and exposed crabs after 10, 15, and 20 days of experimentation. Data are expressed as mean ± standard deviation (n = 5). Comparison between the control and treatment groups is notified as * <i>p</i> < 0.05.</p