Ecological Determinism in the Competition for Space: The Robert H. MacArthur Award Lecture

Ecology ◽  
1984 ◽  
Vol 65 (5) ◽  
pp. 1339-1348 ◽  
Author(s):  
R. T. Paine
Keyword(s):  
Competition For Space ◽  
Ecological Determinism

scholarly journals The effect of colonization dynamics in competition for space in metacommunities

2021 ◽  
Author(s):  
Jorge Arroyo-Esquivel ◽  
Nathan G. Marculis ◽  
Alan Hastings
Keyword(s):  
Continuous Time ◽  
Habitat Suitability ◽  
Limiting Factor ◽  
Modeling Framework ◽  
Competition For Space ◽  
Time Modeling ◽  
Functional Forms ◽  
Colonization Dynamics ◽  
Main Factors ◽  
Metacommunity Dynamics

AbstractOne of the main factors that determines habitat suitability for sessile and territorial organisms is the presence or absence of another competing individual in that habitat. This type of competition arises in populations occupying patches in a metacommunity. Previous studies have looked at this process using a continuous-time modeling framework, where colonizations and extinctions occur simultaneously. However, different colonization processes may be performed by different species, which may affect the metacommunity dynamics. We address this issue by developing a discrete-time framework that describes these kinds of metacommunity interactions, and we consider different colonization dynamics. To understand potential dynamics, we consider specific functional forms that characterize the colonization and extinction processes of metapopulations competing for space as their limiting factor. We then provide a mathematical analysis of the models generated by this framework, and we compare these results to what is seen in nature and in previous models.

New Devonian microconchids (Tentaculita) from the Holy Cross Mountains, Poland

2011 ◽  
Vol 85 (4) ◽  
pp. 757-769 ◽  
Author(s):  
Michał Zatoń ◽  
Wojciech Krawczyński
Keyword(s):  
Sedimentation Rate ◽  
Distal Portion ◽  
Taxonomic Composition ◽  
Soft Bottom ◽  
Holy Cross Mountains ◽  
Competition For Space ◽  
High Sedimentation ◽  
New Material ◽  
Three New Species ◽  
Hard Substrates

Tentaculitoid microconchid tubeworms from Devonian (uppermost Emsian-upper Givetian) deposits of the Holy Cross Mountains, Poland, include three new species from stratigraphically well-constrained lithological units:Polonoconchus skalensisn. gen. n. sp.,Palaeoconchus sanctacrucensisn. sp. andMicroconchus vinnin. sp. The microconchids inhabited fully marine environments during transgressive pulses, as is evidenced from facies and associated fossils.Polonoconchus skalensisn. gen. n. sp. andPalaeoconchus sanctacrucensisn. sp. inhabited secondary firm- to hard-substrates in deeper-water, soft-bottom environments. They developed planispiral, completely substrate-cemented tubes and planispiral tubes with elevated apertures, which is indicative of environments where sedimentation rate is low but competition for space (by overgrowth) may be high.Microconchus vinnin. sp., on the other hand, developed a helically coiled distal portion of the tube as a response to a high sedimentation rate. As the taxonomic composition of Devonian microconchids is poorly recognized at both regional and global scales, this new material contributes significantly to our understanding of the diversity of these extinct tube-dwelling encrusters.

The physical relationships of the abdominal organs in the pregnant ewe

1968 ◽  
Vol 70 (2) ◽  
pp. 171-177 ◽  
Author(s):  
J. M. Forbes
Keyword(s):  
Cross Sections ◽  
Abdominal Fat ◽  
Competition For Space ◽  
Abdominal Organs ◽  
Abdominal Content ◽  
Intestinal Contents ◽  
Medium Quality ◽  
Pregnant Ewe ◽  
In Pregnancy

SUMMARYFive non-pregnant ewes and seventeen ewes at various stages of pregnancy were fed on a medium quality hay for several weeks before being slaughtered and frozen. Each ewe was sawn into 5 cm cross-sections.The sections were photographed. The uterus was extracted from the sections and its volume measured. Volumes of reticulo-rumen contents, intestinal contents and abdominal fat were estimated from the photographs.Models of the uterus and rumen were constructed and examples of these and of the photographs are shown.The volume of the uterus increased steadily as pregnancy progressed, but rumen volume was not reciprocally depressed until the last 5 weeks of pregnancy. Volume of digesta was inversely related to volume of incompressible abdominal content (uterus and fat). Abdominal fat was a particularly important factor in the depression of rumen capacity in pregnancy when there was great competition for space in the abdomen.

Cellular Automaton Models of Interspecific Competition for Space--The Effect of Pattern on Process

1992 ◽  
Vol 80 (3) ◽  
pp. 527 ◽  
Author(s):  
Jonathan Silvertown ◽  
Senino Holtier ◽  
Jeff Johnson ◽  
Pam Dale
Keyword(s):  
Cellular Automaton ◽  
Interspecific Competition ◽  
Competition For Space

Competition for space and food in rainbow trout, Oncorhynchus mykiss, as related to ascorbic acid status

Aquaculture ◽  
1999 ◽  
Vol 180 (1-2) ◽  
pp. 79-87 ◽  
Author(s):  
J.H Blom ◽  
K Dabrowski ◽  
J.D Rapp ◽  
Y Sakakura ◽  
K Tsukamoto
Keyword(s):  
Ascorbic Acid ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Competition For Space ◽  
Acid Status

802.11ax

2020 ◽  
pp. 102-121
Author(s):  
Alison Harcourt ◽  
George Christou ◽  
Seamus Simpson
Keyword(s):  
Mobile Communications ◽  
Internet Access ◽  
The Internet ◽  
Organizational Contexts ◽  
Mobile Access ◽  
Competition For Space ◽  
Wireless Environment ◽  
Service Degradation

The local wireless environment has been the setting for the co-existence of licensed mobile communications operators and unlicensed WiFi Internet access providers. The IEEE802.11 family of standards, developed for WiFi services in the Institute of Electrical and Electronics Engineers (IEEE), has dominated standards-setting. However, the burgeoning demand for mobile access to the Internet has led to competition for space on the spectrum. Left unaddressed, this co-existence has created practical issues of potential territorial incursion, technical interference, and, ultimately, device underperformance and service degradation. The chapter focuses on the IEEE’s efforts to create a co-existence standard in a crowded and highly contested standards-making space. It shows how alternative standards-making organizational contexts, based on licensed spectrum standards traditions, were able to develop and insert co-existence standards for WiFi ahead of the IEEE initiative. The chapter explains how the IEEE developed its 802.11ax co-existence standard in this environment.

On Succession in A Saxicolous Lichen Community

1985 ◽  
Vol 17 (2) ◽  
pp. 167-172 ◽  
Author(s):  
M. E. J. Woolhouse ◽  
R. Harmsen ◽  
L. Fahrig
Keyword(s):  
Community Diversity ◽  
Rock Surface ◽  
Surface Erosion ◽  
Physical Weathering ◽  
Rock Face ◽  
Lichen Community ◽  
Competition For Space ◽  
Allogenic Processes ◽  
Opening Up ◽  
Lichen Flora

AbstractThe lichen flora was sampled at each of the five sites on a near-vertical gneiss rock face. The sites were ranked according to the degree ofweathering of the rock surface and were taken to represent different stages in a succession. The succession shows an increase in species richness and diversity over time, although the proportion of the rock face unoccupied by lichens increases at the oldest site. The succession will be driven by allogenic processes, physical weathering of the rock, facilitation, especially the effects of lichens on surface erosion, and by inhibition, through competition for space. At the oldest site mortality of lichen thalli becomes important, continually opening up new areas for recolonization and maintaining community diversity. The succession may be described by four phases: (1) colonization, (2) growth,(3) competition and (4) senescence.

scholarly journals Success in Competition for Space in Two Invasive Coral Species in the western Atlantic – Tubastraea micranthus and T. coccinea

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0144581 ◽  
Author(s):  
Paul W. Sammarco ◽  
Scott A. Porter ◽  
Melissa Genazzio ◽  
James Sinclair
Keyword(s):  
Coral Species ◽  
Western Atlantic ◽  
Competition For Space
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