Molecular support for marine sculpin (Cottidae; Oligocottinae) diversification during the transition from the subtidal to intertidal habitat in the Northeastern Pacific Ocean

Ramon, Marina L.; Knope, Matthew L.

doi:10.1016/j.ympev.2007.11.005

Cited by 32 publications

(36 citation statements)

References 28 publications

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“…The resulting phylogeny is statistically robust with high bootstrap values and the overall topology is in general agreement with published molecular and morphological phylogenies (e.g. Ramon & Knope 2008). In further agreement with Ramon & Knope (2008), the mapping of maximum habitat depth of each species on to our phylogeny (figure 1) clearly demonstrates that the more ancestral groups of sculpins are primarily subtidal while the more derived species are found in the intertidal or tide pool environment.…”

Section: Results and Discussion (A) Phylogeny And Species Distributionsupporting

confidence: 87%

Mechanisms and evolution of hypoxia tolerance in fish

2008

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The ability of an organism to acquire O 2 from its environment is key to survival and can play an important role in dictating a species' ecological distribution. This study is the first, to our knowledge, to show a tight, phylogenetically independent correlation between hypoxia tolerance, traits involved in dictating O 2 extraction capacity and the distribution of a group of closely related fish species, sculpins from the family Cottidae, along the nearshore marine environment. Sculpins with higher hypoxia tolerance, measured as low critical O 2 tensions (P crit ), inhabit the O 2 variable intertidal zones, while species with lower hypoxia tolerance inhabit the more O 2 stable subtidal zone or freshwater. Hypoxia tolerance is phylogenetically independently associated with an enhanced O 2 extraction capacity, with three principal components accounting for 75 per cent of the variation in P crit : routine O 2 consumption rate; mass-specific gill surface area; and whole blood haemoglobin (Hb)-O 2 -binding affinity (P 50 ). Variation in whole blood Hb-O 2 P 50 is strongly correlated with the intrinsic O 2 -binding properties of the purified Hb while the differences in the concentration of the allosteric Hb modulators, ATP and GTP, provide a Hb system with substantial plasticity for survival in a highly O 2 variable environment.

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Section: Results and Discussion (A) Phylogeny And Species Distributionsupporting

confidence: 87%

Mechanisms and evolution of hypoxia tolerance in fish

2008

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“…1), and the relationships among the species are in general agreement with published molecular phylogenies (e.g., Ramon andKnope 2008, Mandic et al 2009). Both the maximum-likelihood tree presented in figure 1 and the Bayesian consensus tree are used in PIC analysis of the following correlations and regressions between hypoxia tolerance and enzyme and metabolites of energy-producing pathways in sculpins.…”

Section: Phylogenysupporting

confidence: 85%

“…The sculpins used in this study were collected from June through August of 2006, and 2008. Sculpins collected in 2006 were terminally sampled (Mandic et al 2009), and muscle, liver, and brain tissues from those animals were used in this study for analysis of metabolites and maximal enzyme activities.…”

Section: Experimental Animalsmentioning

confidence: 99%

Hypoxia Tolerance in Sculpins Is Associated with High Anaerobic Enzyme Activity in Brain but Not in Liver or Muscle

Mandic

Speers‐Roesch

Richards

2013

Physiological and Biochemical Zoology

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We assessed hypoxia tolerance in 11 species of fish from the superfamily Cottoidea (commonly called sculpins) that are known to differ in their critical O(2) tensions (P(crit)) and examined whether hypoxia tolerance correlated with larger substrate stores and higher maximal activity of enzymes associated with anaerobic adenosine triphosphate production (especially glycolysis). Among the sculpins studied, there was large variation in time to loss of equilibrium (LOE(50)) at 6.4 ± 0.1 torr, with values ranging between 25 and 538 min, and the variation in LOE(50) was correlated with P(crit). Our measures of time to LOE(50) and P(crit) were regressed against maximal enzyme activities of lactate dehydrogenase (LDH), pyruvate kinase (PK), creatine phosphokinase (CPK), and citrate synthase (CS) as well as the concentrations of glycogen, glucose, and creatine phosphate in the brain, liver, and white muscle. In the brain, there was a phylogenetically independent relationship between P(crit) and tissue LDH, PK, CPK, and CS activities expressed relative to tissue mass. Hypoxia-tolerant sculpins (those with low P(crit) values) had higher levels of brain LDH, PK, CPK, and CS than did hypoxia-sensitive sculpins. Similarly, LOE(50) regressed against brain LDH, PK, and CPK activities expressed relative to tissue mass, with the more hypoxia-tolerant species (i.e., those with higher LOE(50)) having higher enzyme activities. However, when the phylogenetic relationship among our sculpins was taken into account, only the relationship between hypoxia tolerance and LDH activity remained significant. When enzyme activities were expressed relative to total soluble protein in the tissue, the only relationships that remained were between brain LDH activity and P(crit) and LOE(50). In liver and white muscle, there were no relationships between the measures of hypoxia tolerance and enzyme activity or metabolite content. Overall, our analysis suggests that hypoxia-tolerant sculpins maintain higher maximal activities of some of the enzymes involved in anaerobic metabolism in the brain, and this may be an adaptation to hypoxia.

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“…These findings suggest that upper intertidal Nerita evolved from lower intertidal lineages. Similar patterns have been documented in littorinid gastropods and sculpin fishes, with a shift from the subtidal to the intertidal (Reid, 1989;Ramon & Knope, 2008), and muricid gastropods, which have transitioned independently from the lower to upper intertidal multiple times (Vermeij & Carlson, 2000).…”

Section: Ecological Role In Diversificationsupporting

confidence: 72%

The relative importance of geography and ecology in species diversification: evidence from a tropical marine intertidal snail (Nerita)

Frey

2010

Journal of Biogeography

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Aim In this study, I examined the relative contributions of geography and ecology to species diversification within the genus Nerita, a prominent clade of marine snails that is widely distributed across the tropics and intertidal habitats. Specifically, I tested whether geographical patterns of speciation correspond primarily to allopatric or sympatric models, and whether habitat transitions have played a major role in species diversification.Location Indo-West Pacific, eastern Pacific, Atlantic, tropical marine intertidal.Methods I used a previously reconstructed molecular phylogeny of Nerita as a framework to assess the relative importance of geographical and ecological factors in species diversification. To evaluate whether recently diverged clades exhibit patterns consistent with allopatric or sympatric speciation, I mapped the geographical distribution of each species onto the species-level phylogeny, and examined the relationship between range overlap and time since divergence using age-range correlation analyses. To determine the relative contribution of habitat transitions to divergence, I traced shifts in intertidal substrate affinity and vertical zonation across the phylogeny using parsimony, and implemented randomization tests to evaluate the resulting patterns of ecological change.Results Within the majority of Nerita clades examined, age-range correlation analysis yielded a low intercept and a positive slope, similar to that expected under allopatric speciation. Approximately 75% of sister species pairs have maintained allopatric distributions; whereas more distantly related sister taxa often exhibited complete or nearly complete geographical overlap. In contrast, only 19% of sister species occupy distinct habitats. For both substrate and zonation, habitat transitions failed to concentrate towards either the tips or the root of the phylogeny. Instead, habitat shifts have occurred throughout the history of Nerita, with a general transition from the lower and mid-littoral towards the upper and supra-littoral zones, and multiple independent shifts from hard (rock) to softer substrates (mangrove, mud and sand).Main conclusions Both geography and ecology appear to have influenced diversification in Nerita, but to different extents. Geography seems to play a principal role, with allopatric speciation driving the majority of Nerita divergences. Habitat transitions appear insignificant in shaping the early and recent history of speciation, and promoting successive diversification in Nerita; however, shifts may have been important for respective divergences (i.e. those that correspond to the transitions) and enhancing diversity throughout the clade.

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Molecular support for marine sculpin (Cottidae; Oligocottinae) diversification during the transition from the subtidal to intertidal habitat in the Northeastern Pacific Ocean

Cited by 32 publications

References 28 publications

Mechanisms and evolution of hypoxia tolerance in fish

Mechanisms and evolution of hypoxia tolerance in fish

Hypoxia Tolerance in Sculpins Is Associated with High Anaerobic Enzyme Activity in Brain but Not in Liver or Muscle

The relative importance of geography and ecology in species diversification: evidence from a tropical marine intertidal snail (Nerita)

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