scholarly journals Sex and occupation time influence niche space of a recovering keystone predator

2019 ◽  
Vol 9 (6) ◽  
pp. 3321-3334 ◽  
Author(s):  
Erin U. Rechsteiner ◽  
Jane C. Watson ◽  
M. Tim Tinker ◽  
Linda M. Nichol ◽  
Matthew J. Morgan Henderson ◽  
...  
Keyword(s):  
Occupation Time ◽  
Niche Space ◽  
Keystone Predator

Testing ecological release as a compensating mechanism for mass mortality in a keystone predator

2020 ◽  
Vol 637 ◽  
pp. 59-69 ◽  
Author(s):  
J Sullivan-Stack ◽  
BA Menge
Keyword(s):  
Community Dynamics ◽  
Limiting Factor ◽  
Sea Star ◽  
Top Predator ◽  
Oregon Coast ◽  
Ecological Release ◽  
Keystone Predator ◽  
Pisaster Ochraceus ◽  
Wasting Syndrome

Top predator decline has been ubiquitous across systems over the past decades and centuries, and predicting changes in resultant community dynamics is a major challenge for ecologists and managers. Ecological release predicts that loss of a limiting factor, such as a dominant competitor or predator, can release a species from control, thus allowing increases in its size, density, and/or distribution. The 2014 sea star wasting syndrome (SSWS) outbreak decimated populations of the keystone predator Pisaster ochraceus along the Oregon coast, USA. This event provided an opportunity to test the predictions of ecological release across a broad spatial scale and determine the role of competitive dynamics in top predator recovery. We hypothesized that after P. ochraceus loss, populations of the subordinate sea star Leptasterias sp. would grow larger, more abundant, and move downshore. We based these predictions on prior research in Washington State showing that Leptasterias sp. competed with P. ochraceus for food. Further, we predicted that ecological release of Leptasterias sp. could provide a bottleneck to P. ochraceus recovery. Using field surveys, we found no clear change in density or distribution in Leptasterias sp. populations post-SSWS, and decreases in body size. In a field experiment, we found no evidence of competition between similar-sized Leptasterias sp. and P. ochraceus. Thus, the mechanisms underlying our predictions were not in effect along the Oregon coast, which we attribute to differences in habitat overlap and food availability between the 2 regions. Our results suggest that response to the loss of a dominant competitor can be unpredictable even when based in theory and previous research.

scholarly journals Unclusterable, underdispersed arrangement of insect‐pollinated plants in pollinator niche space

Ecology ◽  
2021 ◽  
Author(s):  
Carlos M. Herrera
Keyword(s):  
Niche Space

scholarly journals Functional limit theorem for occupation time processes of intermittent maps

Nonlinearity ◽  
2020 ◽  
Vol 33 (3) ◽  
pp. 1183-1217 ◽  
Author(s):  
Toru Sera
Keyword(s):  
Limit Theorem ◽  
Functional Limit Theorem ◽  
Occupation Time ◽  
Functional Limit

THE FEYNMAN–KAC FORMULA AND PRICING OCCUPATION TIME DERIVATIVES

1999 ◽  
Vol 02 (02) ◽  
pp. 153-178 ◽  
Author(s):  
JULIEN-N. HUGONNIER
Keyword(s):  
Brownian Motion ◽  
Time Derivative ◽  
Occupation Time ◽  
Barrier Options ◽  
Occupation Times

In this paper, we undertake a study of occupation time derivatives that is derivatives for which the pay-off is contingent on both the terminal asset's price and one of its occupation times. To this end we use a formula of M. Kac to compute the joint law of Brownian motion and one of its occupation times. General pricing formulas for occupation time derivatives are established and it is shown that any occupation time derivative can be continuously hedged by a controlled portfolio of the basic securities. We further study some examples of interest including cumulative barrier options and discuss some numerical implementations.

INDIVIDUAL- AND POPULATION-LEVEL RESPONSES OF A KEYSTONE PREDATOR TO GEOGRAPHIC VARIATION IN PREY

Ecology ◽  
2008 ◽  
Vol 89 (7) ◽  
pp. 2005-2018 ◽  
Author(s):  
Sergio A. Navarrete ◽  
Tatiana Manzur
Keyword(s):  
Geographic Variation ◽  
Population Level ◽  
Keystone Predator

scholarly journals Statistics of the occupation time for a random walk in the presence of a moving boundary

2001 ◽  
Vol 34 (36) ◽  
pp. 7153-7161 ◽  
Author(s):  
C Godrèche ◽  
J M Luck
Keyword(s):  
Random Walk ◽  
Moving Boundary ◽  
Occupation Time

Limit of occupation time of super Brownian motion on Sierpinski gasket

1998 ◽  
Vol 43 (7) ◽  
pp. 614-614
Author(s):  
Junyi Guo
Keyword(s):  
Brownian Motion ◽  
Sierpinski Gasket ◽  
Occupation Time ◽  
Sierpiński Gasket ◽  
Super Brownian Motion

scholarly journals A Dynamic Energy Budget (DEB) Model for the Keystone Predator Pisaster ochraceus

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e104658 ◽  
Author(s):  
Cristián J. Monaco ◽  
David S. Wethey ◽  
Brian Helmuth
Keyword(s):  
Energy Budget ◽  
Dynamic Energy Budget ◽  
Keystone Predator ◽  
Pisaster Ochraceus
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