scholarly journals Patterns of richness across forest beetle communities—A methodological comparison of observed and estimated species numbers

2020 ◽  
Author(s):  
Nora Haack ◽  
Annegret Grimm‐Seyfarth ◽  
Martin Schlegel ◽  
Christian Wirth ◽  
Detlef Bernhard ◽  
...  
Keyword(s):  
Species Numbers ◽  
Methodological Comparison

scholarly journals Annelid Diversity: Historical Overview and Future Perspectives

Diversity ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 129
Author(s):  
María Capa ◽  
Pat Hutchings
Keyword(s):  
State Of The Art ◽  
Molecular Taxonomy ◽  
Evolutionary Relationships ◽  
Diverse Group ◽  
Future Perspectives ◽  
Special Issue ◽  
Species Numbers ◽  
Species Complexes ◽  
Taxonomic Groups ◽  
A New Species

Annelida is a ubiquitous, common and diverse group of organisms, found in terrestrial, fresh waters and marine environments. Despite the large efforts put into resolving the evolutionary relationships of these and other Lophotrochozoa, and the delineation of the basal nodes within the group, these are still unanswered. Annelida holds an enormous diversity of forms and biological strategies alongside a large number of species, following Arthropoda, Mollusca, Vertebrata and perhaps Platyhelminthes, among the species most rich in phyla within Metazoa. The number of currently accepted annelid species changes rapidly when taxonomic groups are revised due to synonymies and descriptions of a new species. The group is also experiencing a recent increase in species numbers as a consequence of the use of molecular taxonomy methods, which allows the delineation of the entities within species complexes. This review aims at succinctly reviewing the state-of-the-art of annelid diversity and summarizing the main systematic revisions carried out in the group. Moreover, it should be considered as the introduction to the papers that form this Special Issue on Systematics and Biodiversity of Annelids.

Vegetation of rock outcrops in Guinea: granite inselbergs, sandstone table mountains and ferricretes — remarks on species numbers and endemism

Flora ◽  
1994 ◽  
Vol 189 (4) ◽  
pp. 315-326 ◽  
Author(s):  
Stefan Porembski ◽  
Wilhelm Barthlott ◽  
Stephan Dörrstock ◽  
Nadja Biedinger
Keyword(s):  
Rock Outcrops ◽  
Species Numbers ◽  
Table Mountains

scholarly journals Regional and Seasonal Differences in Species Composition and Trophic Groups for Tidepool Fishes of a Western Pacific Island – Taiwan

2018 ◽  
Vol 23 (1) ◽  
pp. 1 ◽  
Author(s):  
Colin K. C. Wen ◽  
Li-Shu Chen ◽  
Kwang-Tsao Shao
Keyword(s):  
Species Composition ◽  
Fish Species ◽  
Fish Assemblages ◽  
Coastal Development ◽  
Species Number ◽  
Pacific Region ◽  
Trophic Groups ◽  
Species Numbers ◽  
Intertidal Fish ◽  
Intertidal Fishes

Spatial and temporal variations in the species composition of assemblages are common in many marine organisms, including fishes. Variations in the fish species composition of subtidal coral reefs have been well documented, however much less is known about such differences for intertidal fish assemblages. This is surprising, given that intertidal fishes are more vulnerable to terrestrial human disturbances. It is critical to evaluate the ecology and biology of intertidal fishes before they are severely impacted by coastal development, especially in developing countries such as those in the tropical western Pacific region where coastal development is rapidly increasing. In this study, we investigated the species composition, abundance, biomass and species number (richness) for intertidal fish assemblages in subtropical (northern) and tropical (southern) Taiwan across four seasons by collecting fishes from tidepools using clove oil. We also examined the gut contents of collected fishes to identify their trophic functional groups in order to investigate regional and seasonal variations for different trophic groups. We found significant differences in the species composition of tidepool fish assemblages between subtropical and tropical Taiwan. Bathygobius fuscus, Abudefduf vaigiensis and Istiblennius dussumieri were dominant species in subtropical Taiwan, whereas Bathygobius coalitus, Abudefduf septemfasciatus and Istiblennius lineatus were dominant in tropical Taiwan. Other species such as Bathygobius cocosensis, Abudefduf sordidus and Istiblennius edentulus were common in both regions. For trophic groups, omnivores and detritivores had or showed trends towards higher species numbers and abundances in the subtropical region, whereas herbivores, planktivores and general carnivores had or showed trends towards higher species numbers and biomass in the tropical region. Overall, many intertidal fish species and trophic groups showed differences in abundance, biomass and species number between subtropical and tropical Taiwan. Further studies on large scale geographical gradients in trophic groups and species compositions in the Indo-west Pacific region are encouraged to assist with ecosystem monitoring and assessment. Keywords: Intertidal fishes, spatio-temporal pattern, feeding guild, diet

Numbers of plant species on the islands of Aldabra Atoll

1979 ◽  
Vol 286 (1011) ◽  
pp. 247-254 ◽  
Keyword(s):  
Plant Species ◽  
Woody Plants ◽  
Mixed Model ◽  
Common Species ◽  
Small Island ◽  
Island Ecosystems ◽  
Species Numbers ◽  
Island Effect ◽  
Species Area ◽  
Number Of Plant Species

The logarithm of island area accounts for 70 % of the variance in the number of plant species occurring on 100 lagoon islands. Two components of island altitude (altitude of the island rim and the logarithm of the island’s inland altitude) are also of importance, and account for 9 % of the variation in species numbers. A further 13 variables account for only an extra 5 % of the variance in the mixed model. These results resemble the findings of other island studies. In the equation S = K A z , z = 0.345 and falls within the range of expected values. The species-area curve gives little indication of the ‘small island effect’ found for other small islands; this may reflect, among other factors, the richness of the Aldabran flora when compared with those of the small island ecosystems already studied. The curve is also compared with that compiled by Williams (1964) and a discrepancy between the two is discussed. Woody plants are largely responsible for the increase of species numbers with increasing area. Species that are restricted to islands of particular sizes are listed and the characteristics of the frequencies of occurrence of the more common species are summarized.

The Regulations of Bird Species' Numbers on Islands

Ecology ◽  
1977 ◽  
Vol 58 (5) ◽  
pp. 1195-1195
Author(s):  
David W. Johnston
Keyword(s):  
Bird Species ◽  
Species Numbers

Methodological Comparison of Different Projects

2020 ◽  
pp. 225-260
Author(s):  
Livia Maria Salvatori ◽  
Maurizio Marceca ◽  
Lorenzo Paglione ◽  
Aurora Angelozzi ◽  
Susanna Caminada ◽  
...  
Keyword(s):  
Methodological Comparison
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