Since most samplings of local species communities are bound to remain substantially incomplete for practical reasons, a wide variety of nonparametric estimators of the number of unrecorded species have been proposed over the past fifty years. Unfortunately, the distinct formulati...
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Research Article10.9734/arrb/2022/v37i430500
Many species among shelled gastropods – either land snails or marine snails – exhibit determinate growth and, therefore, are expected to implement some regulating process aiming at limiting the impact on the final (adult) shell-size of the (possibly excessive) intraspecific varia...
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Research Article10.9734/arrb/2022/v37i230482
For most conispirally-coiled Gastropods with determinate growth, the geometry of spirally-winding whorls is usually constrained by a strong negative correlation between whorl growth rate and the number of whorls reached at adulthood, as originally reported by the late S.J. Gould....
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Research Article10.9734/arrb/2021/v36i1230463
As shown, in particular, by the late S.J. Gould, the involvement of a regulation process, aiming at limiting the range of intraspecific variations in adult shell size, in those land snail species with determinate growth, can be indirectly, but conveniently, diagnosed by highlight...
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Research Article10.9734/arrb/2021/v36i1030439
The species functional structuration (specifically in terms of species richness and average intensity of interspecific competition) is widely varying among species communities and this point is now very well documented in literature. But, what about the species functional structu...
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Research Article10.9734/arrb/2021/v36i830413
Not far from the exceptionally rich ‘Coral Triangle’ on the one hand but, on the other hand, exposed to strongly varying degree of anthropogenic environmental stresses, the reef-associated fish assemblages all along ‘Seribu Islands’ (off Jakarta Bay) are, thus, confronted to both...
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Research Article10.9734/ijecc/2021/v11i630420
Increasing species-richness at the local scale (within species communities) is accommodated, first, by the diversification of the niches respectively associated to species. Yet, in case of excessive supply in colonizing species issued from the regional pool, the corresponding inc...
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Research Article10.9734/ajee/2021/v14i430214
A wide series of commonly used metrics of abundance-evenness (or -unevenness) have been proposed to characterize synthetically the distributions of species-abundances, accounting for the hierarchic-like organization of species within natural communities. Among them, most – if not...
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Research Article10.9734/arrb/2021/v36i430363
Aims: The way species-richness is accommodated and how species-abundance distribution is organized in a hierarchic pattern is central to community ecology. Yet, the process by which species-richness and species-abundances are progressively accommodated can hardly be monitored, in...
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Research Article10.9734/arrb/2021/v36i130335
Numerous anthropogenic threats to the exceptionally rich coral-reef ecosystem at Abrolhos Bank (Brazil) arguably require implementing drastic conservation policy and meanwhile, urge for the prior detailed assessment of species richness and the species distribution across the Bank...
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Research Article10.9734/arrb/2020/v35i1130304
Population dynamics within host-parasite systems in insects is governed by a series of factors, both endogenous and exogenous. Among them, five factors may be considered as major drivers: the respective inherent rates of increase of the host and of the parasite, the level of reso...
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Research Article10.9734/arrb/2020/v35i830256
Multi-phase patterns with more or less sharp phase transitions, first highlighted in thermodynamics, have progressively revealed having wider relevance, being encountered in various other contexts, for example fluid mechanics, and can even occur in the interactive dynamics in bio...
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Research Article10.9734/psij/2020/v24i130172
Even when ecological communities are incompletely sampled (which is most frequent in practice, at least for species-rich assemblages including many rare species), it remains possible to retrieve much more information than could be expected first, by applying numerical extrapolati...
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Research Article10.9734/ajee/2019/v11i330136
To what extent differences in species composition, species richness and species abundance unevenness between marine communities are attributable to heterogeneities of the surrounding environment and/or to inter-community distance is a fundamental issue to be addressed, in order t...
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Research Article10.9734/ajee/2019/v10i330116
The genus Conus forms a conspicuous and rather homogeneous group within marine Gastropods. This makes it all the more interesting to focus on the sub-communities formed by Conus species and to analyze the potential specificities in the internal organization of species in these co...
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Research Article10.9734/ajee/2019/v9i430102
Growing complexity of coral habitat is expected to increase resource partitioning among co-occurring reef fish and, thereby, reduce to some extent the mean competitive intensity. This will have associated consequences on the internal structuring of species in reef fish communitie...
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Research Article10.9734/ajee/2019/v9i330098
Species richness and species abundance unevenness are two major synthetic descriptors of the internal organization within ecological communities. Yet, while the former is a simple concept in essence, the unevenness of species abundance distribution is less so, being partly linked...
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Research Article10.9734/air/2019/v19i130114
The internal organization of reef-fish communities, particularly the species richness and the hierarchical structuring of species abundances, depends on many environmental factors, including fishing intensity and proportion of macroalgal cover which are expected to have determina...
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Research Article10.9734/ijecc/2019/v9i130097
The role of coral reef architecture on species richness and the internal structuration of the associated fish communities has already been addressed several times. The reported results, however, usually remain controversial, possibly because they are based upon incomplete field d...
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Research Article10.9734/ajee/2018/v8i330075
Even when remaining substantially incomplete, the partial inventory of a species assemblage can provide much more information than could be expected first. Indeed, retrieving this information is made possible by applying a rigorous procedure of numerical extrapolation to the part...
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Research Article10.9734/AJEE/2018/46272
Numerous investigations have been conducted trying to unveil some possible correlations between coral-associated fish communities and different gross types of coral morphology that are assumed being differentially attractive to various kinds of fishes. Investigations in this resp...
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Research Article10.9734/AJEE/2018/45402
Anthropogenic environmental stresses, especially physio-chemical pollution, are causing steadily increasing threat to many ecosystems, among which coastal marine communities in tropical shallow waters are especially sensitive. In particular, species-rich marine gastropod assembla...
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Research Article10.9734/ijecc/2018/v8i327169
The detailed analysis of Species Abundance Distributions (“S.A.D.s”) can shed light on how member-species organize themselves within communities, provided that the complete distribution of species abundances is made available first. In this perspective, the numerical extrapolatio...
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Research Article10.9734/AJEE/2018/43918
Besides species richness, the hierarchical structuration of species abundances is the second major characteristic that numerically specifies a community of species. However, while the meaning of species richness is simple and straightforward, the hierarchical structuration of abu...
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Research Article10.9734/AIR/2018/43421
The Distribution of Species Abundances within natural communities – when properly analysed – can provide essential information regarding general aspects of the internal organisation of these communities. In particular, true species richness on the one hand and the intensity of th...
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Research Article10.9734/ijecc/2018/v8i227147
Even when it remains substantially incomplete, the partial inventory of a species assemblage can provide much more information than could be expected at first. This can be achieved by applying a rigorous numerical extrapolation procedure that fully extends the incomplete sampling...
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Research Article10.9734/AJEE/2018/41293
In Bivalves, shell shape descriptors (in particular, elongation E, dissymmetry D, ventral convexity K) are considered functionally-relevant parameters, each of them likely being exposed to specific selective pressures, according to environmental conditions. Indeed, previous inves...
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Research Article10.9734/ajfar/2018/v1i1262
I report an unexpected negative covariance occurring between two major parameters governing shell growth in marine bivalves, especially within the order Veneroida. This relationship is highlighted, here, considering a set of forty, rather common species of clams collected from Fr...
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Research Article10.9734/AJRAVS/2018/39207
The total number of co-occurring species (“true species richness”) and the way their respective abundances are distributed (“species abundance distribution”) are two major descriptive traits of species assemblages, in numerical terms. Moreover, beyond mere description, the specie...
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Research Article10.9734/AIR/2018/39002
Tropical coral reefs are known to harbor considerable biodiversity, especially among invertebrates. Gastropod fauna, as an important component of this biodiversity, yet remains poorly surveyed across most tropical reefs. Moreover, the few published inventories are generally far f...
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Research Article10.9734/AJEE/2017/36831
The process of species accumulation, during progressive sampling, results in the regular, monotonic increase of the number of recorded species with sampling size. On the contrary, the numbers f1(N), f2(N), f3(N), …, fx(N) of those species recorded 1-, 2-, 3-, …, x-times at sampli...
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Research Article10.9734/AIR/2017/35223
Complete or even sub-complete inventories of biodiversity often remain well out of reach, especially when dealing with speciose taxonomic groups, such as insects in general and butterfly fauna in particular. Moreover, it is even uncertain that similar completeness levels may be r...
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Research Article10.9734/JALSI/2017/34058
More or less strong inter-annual variations of species richness are well known in insects in general and in butterfly in particular. Yet, such variations generally rely upon more or less partial samplings and are rarely reliably documented in relevant terms of “true” total specie...
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Research Article10.9734/AJOB/2017/33876
Approximately conispirally coiled shells make the bulk of shell structure among marine gastropod species, apart from those shells with strongly overlapping whorls (typical, in particular, of Cones, Cowries and the like). By selecting appropriately the set of geometrical parameter...
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Research Article10.9734/ARRB/2017/33935
As a rule, most biodiversity inventories at local scales remain more or less incomplete, when dealing with relatively speciose taxonomic groups, such as butterflies in tropical regions. It remains yet possible to take maximum additional advantage of partial inventories and to dev...
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Research Article10.9734/AJEE/2017/32701
As a rule, most biodiversity inventories at local scales remain more or less incomplete, when dealing with relatively speciose taxonomic groups, such as butterfly in tropical regions. Yet, it remains possible to take maximum advantage of partial inventories and to develop reliabl...
Open access
Research Article10.9734/AJEE/2017/32040
The “Species Accumulation Curve” accounts for the rate of increase of the number of recorded species during progressive sampling of an assemblage of species. Due to the usual incompleteness of samplings, the accurate extrapolation of the Species Accumulation Curve has become an e...
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Research Article10.9734/AIR/2016/31791
Incomplete samplings are doomed to become common practice for many inventories of biodiversity, thereby inviting to extrapolate what the rate of accumulation of newly recorded species would be if sampling was to be continued any further. For this purpose, a new derivation is prov...
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Research Article10.9734/ARRB/2016/30522
Under-sampling becomes the current situation for an increasing part of biodiversity surveys, as more and more speciose assemblages and increasingly complex taxonomic groups are progressively addressed. Accordingly, (i) extrapolating the Species Accumulation Curve and (ii) estimat...
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Research Article10.9734/AIR/2016/26387
A lot of nonparametric estimators of the number of unrecorded species after partial sampling of an assemblage of species, have been proposed in the literature. Unfortunately, these different types of estimators provides substantially divergent predictions. While empirical compari...
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Research Article10.9734/ARRB/2016/25104
Incomplete species samplings are deemed to remain the common practice in those groups of animals, such as small or micro- invertebrates, with numerous species that often are more or less difficult to detect in the field. Thus, extrapolating the Species Accumulation Curve as far a...
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Research Article10.9734/ARRB/2015/22351
Aim: Register new species gradually becomes more difficult as sampling of a community progresses, addressing increasingly rarer species. Thus, although biodiversity assessments would ideally require complete samplings, only partial samplings are ordinarily achieved when species a...
Open access
Research Article10.9734/ARRB/2015/18809