scholarly journals Spatial sampling heterogeneity limits the detectability of deep time latitudinal biodiversity gradients

2021 ◽  
Vol 288 (1945) ◽  
pp. 20202762
Author(s):  
Lewis A. Jones ◽  
Christopher D. Dean ◽  
Philip D. Mannion ◽  
Alexander Farnsworth ◽  
Peter A. Allison
Keyword(s):  
Species Richness ◽  
Spatial Sampling ◽  
Polar Regions ◽  
Simulation Framework ◽  
Deep Time ◽  
Biodiversity Patterns ◽  
Different Types ◽  
Sampling Window ◽  
Global Estimates

The latitudinal biodiversity gradient (LBG), in which species richness decreases from tropical to polar regions, is a pervasive pattern of the modern biosphere. Although the distribution of fossil occurrences suggests this pattern has varied through deep time, the recognition of palaeobiogeographic patterns is hampered by geological and anthropogenic biases. In particular, spatial sampling heterogeneity has the capacity to impact upon the reconstruction of deep time LBGs. Here we use a simulation framework to test the detectability of three different types of LBG (flat, unimodal and bimodal) over the last 300 Myr. We show that heterogeneity in spatial sampling significantly impacts upon the detectability of genuine LBGs, with known biodiversity patterns regularly obscured after applying the spatial sampling window of fossil collections. Sampling-standardization aids the reconstruction of relative biodiversity gradients, but cannot account for artefactual absences introduced by geological and anthropogenic biases. Therefore, we argue that some previous studies might have failed to recover the ‘true’ LBG type owing to incomplete and heterogeneous sampling, particularly between 200 and 20 Ma. Furthermore, these issues also have the potential to bias global estimates of past biodiversity, as well as inhibit the recognition of extinction and radiation events.

scholarly journals The longhorn beetles (Coleoptera: Cerambycidae) of National Park «Kremenetski Hory»

2020 ◽  
pp. 129-140
Author(s):  
Iryna Dovganyuk ◽  
Andrew M. Zamoroka
Keyword(s):  
Species Richness ◽  
Quantitative Study ◽  
National Park ◽  
Longhorn Beetles ◽  
Different Types ◽  
First Time

The fauna of the longhorn beetles of ecoregion of Kremenetski Hory and the eponymous National Park was studied very poorly. In the most recent catalogue of Cerambycidae of Western Podillya it was listed only 13 species for the ecoregion. Including other sources, to date, it was known 17 species of the longhorn beetles. In the current study we identified 59 species of the longhorn beetles, 42 of which are reported for the first time for National Park «Kremenetski Hory» and the ecoregion in general. Under our proposed prediction the Cerambycidae species richness should reach 100-120 species. We also presented result of quantitative study of the longhorn beetles within different types of ecosystems of National Park «Kremenetski Hory». We revealed that 10 species are the most abundant on the studied territory.

scholarly journals COMMUNITY STRUCTURE ECHINODERMS (ASTEROIDEA, OPHIUROIDEA, ECHINOIDEA AND HOLOTHUROIDEA) IN THE MARINE NATIONAL PARK EAST SULAWESI WAKATOBI

2016 ◽  
Vol 8 (1) ◽  
pp. 357-366 ◽  
Author(s):  
Eddy Yusron
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
National Parks ◽  
National Park ◽  
Diversity Index ◽  
Dead Coral ◽  
Evenness Index ◽  
Different Types ◽  
High Level ◽  
Richness Index

A study on Echinoderms community structure in marine national parks of Wakatobi, Southeast Sulawesi was conducted in six locations, i.e., Waha Beach, Coastal Sombo, Beach Houses, Beach Kapota, Banakawa beach, and Umala beach in October 2013. All of the six parks were located the Wakatobi territorial waters with coordinates of 5°06'25" S and 123°124'10 E. The results showed of 18 species of echinoderms representing six different types of Asteroidea, two types of Ophiuroidea, six types of Echinoidea, and four types of Holothuroidea. Group of starfish or Asteroidea was the most prominent on seagrass area. Based on the six transects sites, it turned out that the group of starfish (Asteridea) occupied a relatively high level of species richness. From the quantitative analysis values, we obtained diversity index (H) of 1.105 in Sombu, the highest evenness index (J) of 0.989 was found in Umala, and the highest species richness index values (D) of 0.132 was obtained in kapota. It seemed that all echinoderm groups were generally like seagrass microhabitat (12 types). While, sand and dead coral habitats were only occupied by 8 (eight) echinoderm groups. Keywords: echinoderms, diversity, Wakatobi, Southeast Sulawesi

scholarly journals The influence of forest-forming tree species on diversity and spatial distribution of algae in forest litter

2018 ◽  
Vol 45 (2) ◽  
pp. 72-81 ◽  
Author(s):  
Yevhen Maltsev ◽  
Irina Maltseva
Keyword(s):  
Species Richness ◽  
Leaf Litter ◽  
Green Algae ◽  
Tree Species ◽  
Spatial Organization ◽  
Forest Litter ◽  
Equal Distribution ◽  
Blue Green Algae ◽  
Different Types ◽  
The Relationship

Abstract The forest litter plays a significant role in forest ecosystems. The composition of the litter biota comprises micro- and mesofauna, and a great diversity of microorganisms, including unrecognized algae (eukaryotic representatives and Cyanoprokaryota). The aim of this work was to study the diversity of algae in the different types of forest litters and to clarify the relationship between the algae composition and the forest-forming tree species. Our results show that the pine forest litter is the most appropriate habitat for the development of green and yellow-green algae and that this litter type limits the variety of blue-green ones. The admixture of deciduous leaf litter to pine litter caused an increase in the species richness of blue-green algae and diatoms. The algae were unevenly distributed across the sub-horizons of pine litter. The highest species richness of algae was identified in the enzymatic sub-horizon of litter. The peculiarity of the composition of leaf litter algae was a significant variety of green, yellow-green and blue-green algae. The spatial organization of algae communities in the leaf litter was characterized by equal distribution of algae species in the litter-subhorizons.

Developing a Theory of Global Biodiversity

2018 ◽  
pp. 93-123
Author(s):  
Boris Worm ◽  
Derek P. Tittensor
Keyword(s):  
Species Richness ◽  
First Principles ◽  
Predictive Power ◽  
Global Distribution ◽  
Biodiversity Patterns ◽  
Modeling Approach ◽  
Possibility Space ◽  
Competing Hypotheses ◽  
Global Biodiversity

This chapter develops a body of theory to capture and test the key processes governing the global distribution of biodiversity. From this theory, it devises a spatial metacommunity model that enables the reconstruction of documented patterns of species richness from first principles and the prediction of their major features. The chapter starts with a simple, flexible, and tractable framework that can be built on and expanded in order to test competing hypotheses. This modeling approach may be described as an experimental toolbox for global biodiversity patterns. The aim is not necessarily to achieve the highest predictive power, but to explore the possibility space of global biodiversity patterns and their drivers.

scholarly journals Species Richness on Coral Reefs and the Pursuit of Convergent Global Estimates

2015 ◽  
Vol 25 (4) ◽  
pp. 500-505 ◽  
Author(s):  
Rebecca Fisher ◽  
Rebecca A. O’Leary ◽  
Samantha Low-Choy ◽  
Kerrie Mengersen ◽  
Nancy Knowlton ◽  
...  
Keyword(s):  
Species Richness ◽  
Coral Reefs ◽  
Global Estimates

scholarly journals Taxonomic structure of local floras in Sidinskiy and Pribaitakskiy steppes (Krasnoyarsk region)

2019 ◽  
Vol 16 ◽  
pp. 00002
Author(s):  
Ekaterina Antipova ◽  
Olga Enulenko
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Taxonomic Structure ◽  
Central European ◽  
Krasnoyarsk Region ◽  
Full Species ◽  
Central Asian ◽  
Different Types ◽  
Sayan Mountain ◽  
Mountain Country

Sidinskiy and Pribaitakskiy steppes are the part of the Minusinsk province of the Altai-Sayan mountain country. On the territory of steppes 12 local floras (LF) were marked and examined using the same method. Studies were carried out according to the recommendations of A.I. Tolmachev (1931): identification of different types of ecotypes of LF, the full species composition of ecotypes (flora inventory), tracking the completeness of detection in LF. In the Sidinskiy steppe the number of families in the LF varies from 25 (Syida) to 43 (v. Alha), in the Pribaitakskiy steppe there is a big difference in the number of families in the LF from 31 (Krasnoyarsk reservoir, Tuba) to 65 (Mayak, Idra). The leading families in the local steppe flora are Asteraceae, Poaceae, Fabaceae. The Fabaceae family ranks third in the top of ten families in 50 % of LF, determining the type of flora as the Mediterranean-Central Asian (Fabaceae-type). Different types of LF allow to determine the type of all steppe flora as mixed, combining features of boreal (Asteraceae-Poaceae- type) and steppes flora (Fabaceae-type) with close ties with Central European floras (Rosaceae-type). 4 distinct levels of species richness are determined: 1 − 496-544; 2 − 408-413; 3 − 319-374; 4 − 279-298 species.

The Nature of Correlation between the Degree of Dominance and Species Richness in Plant Communities of Different Types: Are the Processes Biological or Stochastic?

2019 ◽  
Vol 50 (5) ◽  
pp. 422-430
Author(s):  
V. V. Akatov ◽  
T. V. Akatova ◽  
D. F. Afanas’ev ◽  
N. M. Sazonets ◽  
E. G. Sushkova ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Communities ◽  
Degree Of Dominance ◽  
Different Types

The moss flora of the Auckland Islands, New Zealand, with a consideration of habitats, origins, and adaptations

1979 ◽  
Vol 57 (20) ◽  
pp. 2226-2263 ◽  
Author(s):  
Dale H. Vitt
Keyword(s):  
Species Richness ◽  
New Zealand ◽  
Polar Regions ◽  
Growth Forms ◽  
Common Pattern ◽  
Moss Species ◽  
Tussock Grassland ◽  
History Of

The moss flora of the Auckland Islands (50°40′ S latitude and 166°00′ E longitude) consists of 145 species and seven varieties in 75 genera. A detailed description of the habitat of each taxon is given. The vegetation, climate, and history of the islands, as they pertain to bryology, are reviewed. Four broad vegetational zones are recognized: forest, scrub, tussock grassland, and tundra as well as areas of herbfields and mires. Phytogeographically, the most common pattern of distribution is Australasian with 29% of the moss species found in both New Zealand and Australia. Other patterns are common as well. Discussion is orientated toward species richness variability in polar regions. The origins and adaptations of mosses in subantarctic landscapes are reviewed and correlations drawn between particular growth forms and individual moss floras and habitats.

Reconstructions of a historic paleontological collection: Diversity re-created

2015 ◽  
Vol 34 (2) ◽  
pp. 348-366
Author(s):  
Tahani Nadim ◽  
Barbara A. R. Mohr ◽  
Sarah A. Löwe
Keyword(s):  
Social Sciences ◽  
Species Richness ◽  
Natural History ◽  
Natural Resources ◽  
Fossil Record ◽  
Historical Reconstruction ◽  
Natural History Museums ◽  
Deep Time ◽  
History Museums ◽  
Plant Collection

As part of a physical and historical reconstruction of a fossil collection, we demonstrate how elucidating biographic aspects of the collector and describing the activities of the institution can expand our understanding of collections as natural, social and historical assemblages. We then show how this understanding can be applied to contemporary concerns by using it in conjunction with modern collections to reconstruct species richness in deep time and to reflect on the term ‘biodiversity’. This multi-disciplinary engagement between natural and social sciences at natural history museums could endow historic collections with novel relevance and thereby provide convincing arguments against their dispersal or deaccession. In this particular case a historic plant collection, the Ewald collection, which is now part of the Museum für Naturkunde in Berlin, Germany, was restored and studied. Originally it was collected during the 1850s when the Prussian government undertook extensive surveying projects and a large part of its territory was geologically mapped. During the surveys, field geologists collected rocks and fossils in order to build a reliable stratigraphy based on the fossil record, partly to assist in the discovery of natural resources for emerging industry.

scholarly journals Ecological Distribution of Protosteloid Amoebae in New Zealand

2013 ◽  
Author(s):  
Geoffrey Zahn ◽  
Stephen L. Stevenson ◽  
Frederick W. Spiegel
Keyword(s):  
Species Richness ◽  
New Zealand ◽  
General Pattern ◽  
Common Species ◽  
Ecological Distribution ◽  
Plant Parts ◽  
Wide Range ◽  
The World ◽  
Different Types ◽  
Study Sites

During the period of March 2004 to December 2007, samples of aerial litter (dead but still attached plant parts) and ground litter were collected from study sites representing a wide range of latitudes (34° S to 50° S) and a variety of different types of habitats throughout New Zealand (including Stewart Island and the Auckland Islands). The objective was to survey the assemblages of protosteloid amoebae present in this region of the world. Twenty-nine described species of protosteloid amoebae were recorded, along with the heterolobesean acrasid, Acrasis rosea. Of the species recovered, Protostelium mycophaga was by far the most abundant and was found in more than half of all samples. Most species were found in fewer than 10% of the samples collected. Seven abundant or common species were found to display significant preferences for aerial litter or ground litter microhabitats. There was some evidence of a general pattern of a decrease in species richness and diversity with increasing latitude and precipitation and elevation.

Sign in / Sign up

Export Citation Format

Share Document