Resource partitioning among freshwater congeneric fishes (Loricariidae: Hypostomus): trophic, spatial, and temporal dimensions

2021 ◽  
pp. 1-11
Author(s):  
Débora Lisandra de Paiva Ferreira ◽  
Gustavo Henriques Soares Guedes ◽  
Luana Giacoia da Silva ◽  
Francisco Gerson Araújo
Keyword(s):  
Resource Partitioning ◽  
Temporal Dimensions

Body shape variation in relation to resource partitioning within cichlid trophic guilds coexisting along the rocky shore of Lake Malawi

2003 ◽  
Vol 53 (1) ◽  
pp. 59-70 ◽  
Author(s):  
Daud Kassam ◽  
Kosaku Yamaoka ◽  
Aggrey Ambali ◽  
Dean Adams
Keyword(s):  
Resource Partitioning ◽  
Body Shape ◽  
Lake Malawi ◽  
Rocky Shores ◽  
Shape Variation ◽  
Cichlid Species ◽  
Body Design ◽  
Ctenopharynx Pictus ◽  
Temporal Dimensions

AbstractTo appreciate better how cichlids segregate along the trophic, spatial and temporal dimensions, it is necessary to understand the cichlids' body design, and its role in resource partitioning. We investigated body shape variation, quantified using landmark-based geometric morphometrics, among cichlid species belonging to algal and zooplankton feeders coexisting along the rocky shores of Lake Malawi, in order to elucidate the adaptive significance of body shape. Significant differences were found within zooplankton feeders in which Copadichromis borleyi had a shorter gape, smaller eyes and shorter caudal peduncle relative to Ctenopharynx pictus and, within algal feeders, Labeotropheus fuelleborni had a shorter and inferior subterminal gape, and shorter head relative to Petrotilapia genalutea. Variation among species is discussed with reference to trophic and feeding microhabitat differentiation which enables us to appreciate the role of body shape in enhancing ecological separation, and thus leads to coexistence among cichlid species.

Dietary overlap and food resource partitioning among fish species of a tropical estuary in Northeastern Brazil

Gaia Scientia ◽  
2016 ◽  
Vol 10 (4) ◽  
pp. 86-95 ◽  
Author(s):  
Adna Ferreira da Silva Garcia ◽  
Ana Lúcia Vendel
Keyword(s):  
Resource Partitioning ◽  
Species Coexistence ◽  
Food Resource ◽  
River Estuary ◽  
Niche Overlap ◽  
Northeastern Brazil ◽  
Dietary Overlap ◽  
Feeding Niche ◽  
Tropical Environments ◽  
Food Resource Partitioning

The current work investigates dietary overlap and food partitioning among nine abundant carnivorous fishes caught in the shallow waters of the Paraíba do Norte river estuary, Paraíba State, Brazil. Fishes were sampled with a beach seine net between January and December 2008 and a total of 958 specimens had their stomach content analyzed. Crustacea was the dominant food resource for Lutjanus alexandrei, L. jocu and Bathygobius soporator, whereas Telostei were consumed mainly by Centropomus undecimalis and C. parallelus. In contrast, Polychaeta were preyed upon mainly by Diapterus rhombeus, Eucinostomus argenteus, Sciades herzbergii and S. parkeri. Although most species consumed similar food items, they did that in varying proportions and amounts. Overall, the niche overlap among species was low (< 0.60), but there were several cases where pair of species had their feeding niche highly overlapped (between 0.72 and 0.97). These findings corroborate the hypothesis that food resource partitioning determines species coexistence in estuarine tropical environments.

The Whole Self

2018 ◽  
Author(s):  
George Pattison
Keyword(s):  
The Self ◽  
Present Moment ◽  
Christian Spirituality ◽  
Temporal Dimensions

This chapter addresses the question as to how the Christian devout life is related to contemporary holistic spirituality, taking C. G. Jung as representative of holistic spirituality’s quest to balance the binary elements of the self. By way of contrast, Christian spirituality might seem to require the hierarchical subordination of one part of the self to another, reinforcing suspicions as to its essentially heteronomous nature. Nevertheless, the devout life can be shown to be a life involving the coordination of ‘body, mind, and spirit’. Where contemporary holism emphasizes the spatial balancing of the self the devout life integrates spatial and temporal dimensions of selfhood seeking to be focused on the sacrament of the present moment as it moves forward in tranquillity and equanimity.

scholarly journals Age‐ and sex‐related dietary specialization facilitate seasonal resource partitioning in a migratory shorebird

2021 ◽  
Vol 11 (4) ◽  
pp. 1866-1876
Author(s):  
Laurie A. Hall ◽  
Susan E. W. De La Cruz ◽  
Isa Woo ◽  
Tomohiro Kuwae ◽  
John Y. Takekawa
Keyword(s):  
Resource Partitioning ◽  
Dietary Specialization ◽  
Age And Sex

scholarly journals EZH2 reduction is an essential mechanoresponse for the maintenance of super-enhancer polarization against compressive stress in human periodontal ligament stem cells

2020 ◽  
Vol 11 (9) ◽  
Author(s):  
Qian Li ◽  
Xiwen Sun ◽  
Yunyi Tang ◽  
Yanan Qu ◽  
Yanheng Zhou ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mechanical Stress ◽  
Periodontal Ligament ◽  
Compressive Force ◽  
Mechanical Stimuli ◽  
Periodontal Ligament Stem Cells ◽  
Super Enhancer ◽  
Ezh2 Expression ◽  
A Genome ◽  
Temporal Dimensions

Abstract Despite the ubiquitous mechanical cues at both spatial and temporal dimensions, cell identities and functions are largely immune to the everchanging mechanical stimuli. To understand the molecular basis of this epigenetic stability, we interrogated compressive force-elicited transcriptomic changes in mesenchymal stem cells purified from human periodontal ligament (PDLSCs), and identified H3K27me3 and E2F signatures populated within upregulated and weakly downregulated genes, respectively. Consistently, expressions of several E2F family transcription factors and EZH2, as core methyltransferase for H3K27me3, decreased in response to mechanical stress, which were attributed to force-induced redistribution of RB from nucleoplasm to lamina. Importantly, although epigenomic analysis on H3K27me3 landscape only demonstrated correlating changes at one group of mechanoresponsive genes, we observed a genome-wide destabilization of super-enhancers along with aberrant EZH2 retention. These super-enhancers were tightly bounded by H3K27me3 domain on one side and exhibited attenuating H3K27ac deposition and flattening H3K27ac peaks along with compensated EZH2 expression after force exposure, analogous to increased H3K27ac entropy or decreased H3K27ac polarization. Interference of force-induced EZH2 reduction could drive actin filaments dependent spatial overlap between EZH2 and super-enhancers and functionally compromise the multipotency of PDLSC following mechanical stress. These findings together unveil a specific contribution of EZH2 reduction for the maintenance of super-enhancer stability and cell identity in mechanoresponse.

Enhancing cloud performance using task scheduling strategy based on resource ranking and resource partitioning

2021 ◽  
Author(s):  
Ismail Zahraddeen Yakubu ◽  
Muhammad Aliyu ◽  
Zainab Aliyu Musa ◽  
Zakari Idris Matinja ◽  
I. M. Adamu
Keyword(s):  
Task Scheduling ◽  
Resource Partitioning ◽  
Scheduling Strategy

Spatiotemporal Object Database Approach to Dynamic Segmentation

2003 ◽  
Vol 1836 (1) ◽  
pp. 118-125 ◽  
Author(s):  
Bo Huang ◽  
Li Yao
Keyword(s):  
Query Language ◽  
Time Varying ◽  
Data Types ◽  
The Road ◽  
Dynamic Segmentation ◽  
Management Group ◽  
Object Database ◽  
On The Road ◽  
Temporal Dimensions ◽  
Spatiotemporal Queries

Dynamic segmentation is viewed as one of the most important functions of geographic information systems for transportation applications. Although the road network and associated events (e.g., pavement material, traffic volume, incidents) can be referenced to both space and time, the spatial and temporal dimensions have not been well integrated. Modeling space-varying, time-varying, and space-time-varying events in dynamic segmentation by using an object database approach that is in line with the Object Database Management Group standard is explored. A mechanism called parametric polymorphism is used to lift conventional data types to spatial, temporal, and spatiotemporal types for maintaining knowledge about events that could change spatially, temporally, and spatiotemporally along linear features. An associated object query language, DS-OQL, was designed to support the formulation of spatial, temporal, and spatiotemporal queries on the road and event information.

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