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\subsubsection{Complexity in Latitudinal Gradient}  Comparing the average of complexity for an annual cycle in the Artic to Tropical transect as latitudinal gradient, we can see that NL appears to represent a transition point for complexity values (Fig. **). At this point for Physico-chemical subsystem decreasing complexity goes from very high to high category (0.6909), by reason of emergence increasing (0.75). Then, at the tropical lake the category of complexity goes to very high level again, due the increasing of regularity and their consequently emergence reduction.     For limiting nutrients subsystem, complexity has a sinusoidal behavior going to very high at the Ar to fair in NH; high category is maintaining in NL and T. The transition point for NL is more evident from emergence values because emergence is almost 0.62 (fair category). Emergence starts in the low category in Ar and finish in T in the same category. This means, limiting nutrient change to a greater proportion at NL latitudes.     For Biomass, the transition at NL point is more evident than other subsystems because complexity values reach the higher category of Ar-T transect (0,74; very high category). For Ar and NH biomass, complexity value was classified in the low category and for T in very low.     Parametric multiple comparison test of Tukey shows that, in terms of average complexity, physic-chemical and limiting nutrients did not have significance differences (p= 0.85; p>0.05) while biomass has significance differences with the other two subsystems (*p<0.05). On the other hand, ANOVA test shows that there are not significance differences among complexity of lakes in the Ar-T transect (p>0.05).     In ecological terms, the dynamics observed at NL point in the transect Ar-T could be estimates as a complexity ecotone or “complextone”(tone, from the Greek tonos or tension). That means that NL point could be considered as a “physical transition zone” for complexity values among lakes in a latitudinal gradient. Consequently for some variables therein subsystems it is estimates that it could be to represents diverse complexity ecoclines or “complexcline” (cline from Greek: κλίνω "to possess or exhibit gradient, to lean"), due their complexity variation. For example for biomass, we can that there is a biocline in the transect Ar-T and in particular for cyanobacteria at the planktonic zone (PCy) we can name a complex cyanocline.  \subsection{Autopoiesis}  In terms of autopoiesis, the autonomy of the biomass at the tropic demonstrates that this subsystem could be affected in major proportions in case of climatic change events.