Effective evolutionary time¶

Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.

Version: v1 · 2026-09-28 · History
Domain-specific #: 9166
Domain group: Natural Sciences
Origin domain: Biology & Ecology
Subdomains: Macroecology, Biogeography → Biology & Ecology

Core Idea¶

Effective evolutionary time is treated here as the recurring natural sciences, engineering, and health identity summarized by this source-grounded definition: Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.

The hypothesis of effective evolutionary time attempts to explain gradients, in particular latitudinal gradients in species diversity. Bernhard Rensch, for example, stated that evolutionary rates also depend on temperature: numbers of generation in poikilotherms, but sometimes also in homoiotherms (homoiothermic), are greater at higher temperatures and the effectiveness of selection is therefore greater. Since vacant niches into which new species can be absorbed are available at all latitudes, the consequence is accumulation of more species at low latitudes.

All earlier approaches remained without basis without the assumption of vacant niches, as there is no evidence that niches are generally narrower in the tropics, i.e., an accumulation of species cannot be explained by subdivision of previously utilized niches (see also Rapoport's rule). It has become more and more apparent that species diversity is best correlated with environmental temperature and more generally environmental energy. Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.

For Effective evolutionary time, the abstraction is narrower than the article's general subject matter: a positive case must preserve These findings are the basis of the hypothesis of effective evolutionary time. Retaining only the name, a familiar example, or a downstream effect is insufficient. The specialist roles and tests remain anchored in natural sciences, engineering, and health, which is why this identity is domain-specific rather than prime.

Structural Signature¶

Sig role-phrases:

Defining carrier — It proposes that species diversity is a direct consequence of temperature-dependent processes and the time ecosystems have existed under more or less equal conditions.
Constitutive relation — Such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat.
Operating condition — Thus, diversity of marine benthos, interrupted by some collapses and plateaus, has risen from the Cambrian to the Recent, and there is no evidence that saturation has been reached.
Recognition evidence — They showed that species richness can be predicted from the biochemical kinetics of metabolism, and concluded that evolutionary rates are determined by generation times and mutation rates both correlated with metabolic rates which have the same Boltzmann relation with temperature.
Admissible variation — They further concluded that these findings support the mechanisms for latitudinal gradients proposed by Rohde.
Characteristic consequence — Rohde (1992, 1978) had already pointed out that “it may well be that mammalian diversity is entirely determined by the diversity of plants and poikilothermic animals further down in the hierarchy”, i.e., by a Red Queen effect.
Failure boundary — (2010) extended their earlier study on plants by determining whether the effect is also found within highly conserved DNA.

What It Is Not¶

Not the whole field of natural sciences, engineering, and health. The node requires the specific identity stated by Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.
Not an over-broad reading. The hypothesis, in contrast to most other hypotheses attempting to explain latitudinal or other gradients in diversity, does not rely on the assumption that different latitudes or habitats generally have different "ceilings" for species numbers, which are higher in the tropics than in cold environments.
Not an over-broad reading. This has been shown for many animal and plant groups, although exceptions exist (see latitudinal gradients in species diversity).
Not an over-broad reading. Vacant niches are available at all latitudes, and differences in the number of such niches can therefore not be the limiting factor for species richness.
Not automatically Nearly neutral theory of molecular evolution. Retrieval proximity does not establish equivalence; the two identities must be compared by carrier, operation, and failure boundary.

Scope of Application¶

Effective evolutionary time applies literally inside natural sciences, engineering, and health wherever the source-defined carrier and relation can be established. Its documented habitats include:

Recent studies. (2002) described a general model also based on first principles of allometry and biochemical kinetics which makes predictions about generation times as a function of body size and temperature.
Background. This has been shown for many animal and plant groups, although exceptions exist (see latitudinal gradients in species diversity).
Background. It has become more and more apparent that species diversity is best correlated with environmental temperature and more generally environmental energy.
Background. Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.
Background. Mutation rates and speed of selection due to faster physiological rates are highest, and generation times which also determine speed of selection, are smallest at high temperatures.
Background. This leads to a faster accumulation of species, which are absorbed into the abundantly available vacant niches, in the tropics.

Outside natural sciences, engineering, and health, the name should be retained only when these same operational conditions survive; otherwise the comparison belongs to the broader parent Theory or should be marked as analogy.

Clarity¶

A clear use of Effective evolutionary time names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption. The strongest recognition evidence in the frozen account is: They showed that species richness can be predicted from the biochemical kinetics of metabolism, and concluded that evolutionary rates are determined by generation times and mutation rates both correlated with metabolic rates which have the same Boltzmann relation with temperature. A report should distinguish that evidence from a proxy, consequence, or common implementation. It should also state the qualification The hypothesis, in contrast to most other hypotheses attempting to explain latitudinal or other gradients in diversity, does not rely on the assumption that different latitudes or habitats generally have different "ceilings" for species numbers, which are higher in the tropics than in cold environments. so that a reader can reproduce the classification rather than infer it from topical resemblance.

Manages Complexity¶

Effective evolutionary time compresses multiple natural sciences, engineering, and health details into a stable diagnostic relation. The source shows both the central mechanism—such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat.—and the practical consequence—rohde (1992, 1978) had already pointed out that “it may well be that mammalian diversity is entirely determined by the diversity of plants and poikilothermic animals further down in the hierarchy”, i.e., by a Red Queen effect. This compression makes cases comparable while leaving parameters, conventions, exceptions, and evidential quality explicit. It is lossy by design: local history and implementation details may be omitted only when they do not alter the defining relation.

Abstract Reasoning¶

Type the carrier. Identify the natural sciences, engineering, and health entities to which the claim applies.
State the relation. Use the source-grounded identity: Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption.
Check operation and conditions. Thus, diversity of marine benthos, interrupted by some collapses and plateaus, has risen from the Cambrian to the Recent, and there is no evidence that saturation has been reached.
Demand recognition evidence. They showed that species richness can be predicted from the biochemical kinetics of metabolism, and concluded that evolutionary rates are determined by generation times and mutation rates both correlated with metabolic rates which have the same Boltzmann relation with temperature.
Test variation. Change an implementation or setting while preserving they further concluded that these findings support the mechanisms for latitudinal gradients proposed by Rohde.
Run the collapse test. Remove the defining operation; if the label still seems equally apt, only a topic or correlate was retained.
Reduce cautiously. When the specialist conditions cannot be carried, route the residual comparison to Theory.

Knowledge Transfer¶

Within the home domain. Knowledge about Effective evolutionary time transfers literally when a new case preserves the same carrier type, relation, and recognition test. (2002) described a general model also based on first principles of allometry and biochemical kinetics which makes predictions about generation times as a function of body size and temperature. This has been shown for many animal and plant groups, although exceptions exist (see latitudinal gradients in species diversity).

Beyond the home domain. No canonical parent is asserted for Effective evolutionary time. An outside case receives the specialist name only when the same typed roles and rejection conditions can be filled literally; otherwise the comparison remains an analogy pending later graph densification.

Examples¶

Canonical¶

Bernhard Rensch, for example, stated that evolutionary rates also depend on temperature: numbers of generation in poikilotherms, but sometimes also in homoiotherms (homoiothermic), are greater at higher temperatures and the effectiveness of selection is therefore greater. This case is canonical because it supplies a concrete carrier and lets the defining relation be checked rather than merely named.

Mapped back: carrier → the entities in the documented case; operation → These findings are the basis of the hypothesis of effective evolutionary time; recognition evidence → They showed that species richness can be predicted from the biochemical kinetics of metabolism, and concluded that evolutionary rates are determined by generation times and mutation rates both correlated with metabolic rates which have the same Boltzmann relation with temperature

Applied / In Practice¶

Such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat. The applied case shows how the identity is used under a second setting or qualification while keeping the same operative relation.

Mapped back: changed setting → Historical aspects; invariant → These findings are the basis of the hypothesis of effective evolutionary time; boundary → the case exits the class when the hypothesis, in contrast to most other hypotheses attempting to explain latitudinal or other gradients in diversity, does not rely on the assumption that different latitudes or habitats generally have different "ceilings" for species numbers, which are higher in the tropics than in cold environments

Structural Tensions¶

T1 — Stable identity versus admissible variation. The hypothesis, in contrast to most other hypotheses attempting to explain latitudinal or other gradients in diversity, does not rely on the assumption that different latitudes or habitats generally have different "ceilings" for species numbers, which are higher in the tropics than in cold environments. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Which changes preserve the defining relation, and which replace it?

T2 — Recognition versus proxy. This has been shown for many animal and plant groups, although exceptions exist (see latitudinal gradients in species diversity). The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the cited evidence establish the identity or only a correlated sign?

T3 — Definition versus implementation. Vacant niches are available at all latitudes, and differences in the number of such niches can therefore not be the limiting factor for species richness. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Is the observed implementation constitutive, optional, or merely common?

T4 — Scope versus overextension. Such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Can every claimed application fill the same typed roles without metaphor?

T5 — Transfer versus domain accent. It proposes that species diversity is a direct consequence of temperature-dependent processes and the time ecosystems have existed under more or less equal conditions. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the receiving case instantiate Effective evolutionary time literally, co-instantiate Theory, or only resemble it?

T6 — Autonomy versus reduction. Such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: What does Effective evolutionary time distinguish that the broader parent Theory leaves together?

Structural–Framed Character¶

Effective evolutionary time is structural-leaning. Its structural side is the repeatable organization summarized by Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption. Its framed side is the natural sciences, engineering, and health vocabulary that fixes the carrier, evidence, exceptions, and admissible transformations.

Evaluative weight: the identity can be stated descriptively even when applications carry practical stakes. Human-practice dependence: the source-grounded carrier determines whether the relation exists independently or is constituted by a practice. Institutional origin: disciplinary conventions stabilize the name and test. Vocabulary portability: Thus, diversity of marine benthos, interrupted by some collapses and plateaus, has risen from the Cambrian to the Recent, and there is no evidence that saturation has been reached. Import versus recognition: literal transfer requires the same mechanism; shape alone is analogy.

Its portable skeleton is Theory. Its character: a recurring specialist identity whose thin organization can be abstracted, while its operational meaning remains domain-bound.

Structural Core vs. Domain Accent¶

What is skeletal. Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption. The stable skeleton is the typed relation expressed in that definition and the entry's recognition and collapse tests. The source identifies these operative conditions: It proposes that species diversity is a direct consequence of temperature-dependent processes and the time ecosystems have existed under more or less equal conditions. Such different ceilings are thought to be, for example, determined by heterogeneity or area of the habitat. It further constrains recognition and variation through: Thus, diversity of marine benthos, interrupted by some collapses and plateaus, has risen from the Cambrian to the Recent, and there is no evidence that saturation has been reached. They showed that species richness can be predicted from the biochemical kinetics of metabolism, and concluded that evolutionary rates are determined by generation times and mutation rates both correlated with metabolic rates which have the same Boltzmann relation with temperature.

What is domain-bound. natural sciences, engineering, and health supplies the operative entities, technical vocabulary, warrants, and exceptions that make Effective evolutionary time literal. Its documented scope includes the condition that (2002) described a general model also based on first principles of allometry and biochemical kinetics which makes predictions about generation times as a function of body size and temperature. Another bounded application condition is that This has been shown for many animal and plant groups, although exceptions exist (see latitudinal gradients in species diversity). These are not decorative examples; they determine which carrier and evidence can fill the abstraction's roles.

Why no parent is asserted. Removing those specialist details does not currently yield one live catalog node that is a necessary genus for every instance. The entry is therefore approved as unparented rather than attached by topical resemblance. Its collapse evidence remains specific—They further concluded that these findings support the mechanisms for latitudinal gradients proposed by Rohde.—and future graph densification may discover a defensible relation only if it preserves that boundary.

Approved unparented node. No current live node supplies a defensible necessary genus or structural prerequisite for Effective evolutionary time. The reviewed identity is: Effective evolutionary time is a hypothesis that species diversity accumulates faster where temperature-dependent evolutionary rates are higher and environmental conditions persist longer without major disruption. The accelerated suggestion was declined because topical or lexical similarity does not establish hierarchy; the node is admitted without a parent pending later graph densification.
Related reasoning operations. Evidence, representation, comparison, classification, transformation, or evaluation may participate in particular cases, but participation does not make any one of them a necessary parent of every instance.

Neighborhood in Abstraction Space¶

Effective evolutionary time sits in a moderately populated region (53^rd percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.

Family — Evolutionary & Ecological Hypotheses (21 abstractions)

Nearest neighbors

Population distribution — 0.88
Species–Area Relationship — 0.87
Heteropatric Speciation — 0.86
Ecological Effects of Biodiversity — 0.86
Plankton — 0.85

Computed from structural-signature embeddings · 2026-10-08

Not to Be Confused With¶

Theory. The parent omits the specialist differentia. Tell: Can the case establish These findings are the basis of the hypothesis of effective evolutionary time?
Nearly neutral theory of molecular evolution. Modification of the neutral theory of molecular evolution that accounts for the fact that not all mutations are either so deleterious such that they can be ignored, or else neutral. Tell: Which entry's carrier, operation, and failure condition are satisfied?
EICA Hypothesis. EICA Hypothesis is a recurring identity in natural science, engineering, and health defined by: Hypothesis in invasion biology. Tell: Which entry's carrier, operation, and failure condition are satisfied?
Emergent evolution. Explain evolutionary history through the appearance of qualitatively novel levels or properties that depend on lower-level processes yet are not exhaustively characterized in the vocabulary used for those processes. Tell: Which entry's carrier, operation, and failure condition are satisfied?
A measurement, proxy, or consequence. Those may provide evidence without being the identity. Tell: Would Effective evolutionary time remain present if the detector or downstream effect changed?
A metaphorical analogue. A similar shape outside natural sciences, engineering, and health lacks the specialist mechanism. Tell: Do the native roles transfer literally, or only the parent Theory?

References¶

Frozen Wikipedia discovery revision: https://en.wikipedia.org/wiki/Effective_evolutionary_time (revision 1363247446).
Preserved source candidate: http://www.cambridge.org/9780521674553
Preserved source candidate: https://onlinelibrary.wiley.com/doi/pdf/10.1890/03-9000

The frozen Wikipedia revision is discovery provenance. The retained source set was reviewed for identity, formal or operational relation, and scope. The encyclopedia's structural synthesis is bounded to those claims; a thin authority surface is recorded as a nonblocking source-strengthening repair rather than concealed.