scholarly journals Temperature-induced Multi-species Cohort Effects in Sympatric Snakes

2021 ◽  
Author(s):  
Richard King
Keyword(s):  
Population Dynamics ◽  
Generation Time ◽  
Cohort Effects ◽  
Reproductive Phenology ◽  
Thamnophis Sirtalis ◽  
Temperature Dependent ◽  
Present Evidence ◽  
June July ◽  
Size Data ◽  
Operative Temperatures

In reptiles, reproductive maturity is often determined by size rather than age. Consequently, growth early in life may influence population dynamics through effects on generation time and survival to reproduction. Because reproductive phenology and pre- and post-natal growth are temperature-dependent, environmental conditions may induce multi-species cohort effects on body size in sympatric reptiles. I present evidence of this using ten years of neonatal size data for three sympatric viviparous snakes, Dekay’s Brownsnakes (Storeria dekayi), Red-bellied Snakes (S. occipitomaculata) and Common Gartersnakes (Thamnophis sirtalis). End-of-season neonatal size varied in parallel across species such that snout-vent length was 36-61% greater and mass was 65-223% greater in years when gestating females could achieve higher April-May (vs. June-July or August-September) operative temperatures. Thus, temperature had a larger impact during follicular enlargement and ovulation than during gestation or post-natal growth. Multi-species cohort effects like these may affect population dynamics and increase with climate change.

Production and population dynamics of Ampelisca tenuicornis (Amphipoda) with notes on the biology of its parasite Sphaeronella longipes (Copepoda)

1977 ◽  
Vol 57 (4) ◽  
pp. 955-968 ◽  
Author(s):  
Martin Sheader
Keyword(s):  
Population Dynamics ◽  
Generation Time ◽  
Population Studies ◽  
Generation Length ◽  
Two Generations ◽  
The Mediterranean

Ampelisca tenuicornis Lilljeborg, 1855, is a member of a widely distributed genus of benthic tube-dwelling amphipods. Population studies of A. macrocephala Lilljeborg in the Øresund show it to have a generation length of 2 years (Kanneworff, 1965), and A. vadorum Mills off Massachusetts, U.S.A., produces two generations per year (Mills, 1967). A. brevicornis (Costa) in the Mediterranean breeds throughout the year with a generation time of 5–7 months (Kaim-Malka, 1969), but has only one generation per year in Helgoland Bight (Klein, Rachor & Gerlach, 1975).

scholarly journals Linking lineage and population observables in biological branching processes

2019 ◽  
Author(s):  
Reinaldo García-García ◽  
Arthur Genthon ◽  
David Lacoste
Keyword(s):  
Population Dynamics ◽  
Generation Time ◽  
Doubling Time ◽  
Branching Processes ◽  
Underlying Mechanism ◽  
Population Doubling ◽  
Population Doubling Time ◽  
Division Rate ◽  
Fluctuation Theorems ◽  
The Mean

Using a population dynamics inspired by an ensemble of growing cells, a set of fluctuation theorems linking observables measured at the lineage and population levels are derived. One of these relations implies inequalities comparing the population doubling time with the mean generation time at the lineage or population levels. We argue that testing these inequalities provides useful insights into the underlying mechanism controlling the division rate in such branching processes.

Cohort effects and deer population dynamics

Ecoscience ◽  
2003 ◽  
Vol 10 (4) ◽  
pp. 412-420 ◽  
Author(s):  
Jean-Michel Gaillard ◽  
Anne Loison ◽  
Carole ToÏgo ◽  
Daniel Delorme ◽  
Guy Van Laere
Keyword(s):  
Population Dynamics ◽  
Cohort Effects ◽  
Deer Population

scholarly journals Thermoregulation of Escherichia coli hchA Transcript Stability

2007 ◽  
Vol 189 (15) ◽  
pp. 5779-5781 ◽  
Author(s):  
Aviram Rasouly ◽  
Yotam Shenhar ◽  
Eliora Z. Ron
Keyword(s):  
Escherichia Coli ◽  
High Temperature ◽  
Low Temperatures ◽  
Temperature Dependent ◽  
Present Evidence ◽  
Transcript Stability

ABSTRACT The conserved chaperone Hsp31 of Escherichia coli is transcribed at low temperatures by σS and repressed by H-NS, whereas at high temperature, transcription is by σ70 independently of both σS and H-NS. Here we present evidence for an additional, novel, temperature-dependent control of Hsp31 expression by increased transcript stability.

Reproductive biology, breeding seasons, and growth of eastern chipmunks, Tamias striatus (Rodentia: Sciuridae) in Canada

1972 ◽  
Vol 50 (8) ◽  
pp. 1069-1085 ◽  
Author(s):  
Lorraine C. Smith ◽  
Donald A. Smith
Keyword(s):  
Reproductive Age ◽  
Adult Size ◽  
Museum Specimens ◽  
Adult Males ◽  
Tamias Striatus ◽  
Breeding Condition ◽  
Eastern Chipmunks ◽  
June July ◽  
Breeding Seasons ◽  
Size Data

Reproductive, age, and body-size data from 1403 museum specimens from Manitoba to Nova Scotia and data on live chipmunks studied in the field in southeastern Ontario were analyzed. Schedules of the major stages of reproduction and growth are summarized graphically. Most adult males are in breeding condition (with large testes in black scrotal sacs and macroscopic tubules in caudae epididymidon) from March to June. As females can breed in March–April and (or) June–July, eastern chipmunks are unique among hibernating sciurids in that they have two breeding seasons per year. These occur over much of the Canadian range, with distinct waves of young appearing above ground in June and September. Spring breeding is probably annual and ubiquitous but records are too few to reveal the local frequency of summer breeding. Young have emerged in four consecutive Septembers at Stanley Corners, Ontario. Litter sizes from embryo and scar counts averaged 4.8 and 4.9. Although the young attain adult size and dentition in 3 months, most do not breed until 11 months old. We have questioned or explained conflicting reports and conclude that the breeding habits of Canadian chipmunks are essentially similar to those described by some U.S. workers.

Cohort effects and population dynamics

2002 ◽  
Vol 5 (3) ◽  
pp. 338-344 ◽  
Author(s):  
Jan Lindstrom ◽  
Hanna Kokko
Keyword(s):  
Population Dynamics ◽  
Cohort Effects

An addition to Krebs' restatement of the Chitty Hypothesis from an entomological perspective

1982 ◽  
Vol 60 (5) ◽  
pp. 833-837
Author(s):  
J. A. Garland
Keyword(s):  
Population Dynamics ◽  
Schistocerca Gregaria ◽  
Locusta Migratoria ◽  
Self Regulation ◽  
Test Case ◽  
Animal Population ◽  
Present Evidence ◽  
Zeiraphera Diniana ◽  
The Moment ◽  
Larch Bud Moth

The insect examples which Krebs used to illustrate the Chitty Hypothesis of self-regulation in animal population dynamics are updated. For the larch bud moth, Zeiraphera diniana, regulation still is best explained by environmental factors. With the several species of plague locusts, including Locusta migratoria, L. pardalina, and Schistocerca gregaria, locustol and two potential pheromones combine to produce an apparent perpetual state of gregarisation. On present evidence, self-regulation by means of microevolution does not appear to be involved in the action of locust chemical releasing stimuli; so that, for the moment, neither entomological test case can be said to support the Chitty Hypothesis.

SIMULATION OF TEMPERATURE-DEPENDENT DEVELOPMENT IN POPULATION DYNAMICS MODELS

1975 ◽  
Vol 107 (11) ◽  
pp. 1167-1174 ◽  
Author(s):  
R. E. Stinner ◽  
G. D. Butler ◽  
J. S. Bacheler ◽  
C. Tuttle
Keyword(s):  
Population Dynamics ◽  
Trichoplusia Ni ◽  
Variable Temperature ◽  
Heliothis Zea ◽  
Anthonomus Grandis ◽  
Temperature Dependent ◽  
Dependent Development ◽  
Temperature Regimes ◽  
Population Dynamics Models ◽  
Dynamics Models

AbstractThe simulation of variability in temperature-dependent development is discussed. An algorithm for simulation of this variability is developed and validated under constant and variable temperature regimes for Anthonomus grandis, Trichoplusia ni, and Heliothis zea.

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