scholarly journals Disentangling the factors driving tree reproduction

Ecosphere ◽  
2016 ◽  
Vol 7 (9) ◽  
Author(s):  
Hendrik Davi ◽  
Maxime Cailleret ◽  
Gwendal Restoux ◽  
Annabelle Amm ◽  
Christian Pichot ◽  
...  
Keyword(s):  
Tree Reproduction

The Influence of Feral Goats on Koa Tree Reproduction in Hawaii Volcanoes National Park

Ecology ◽  
1973 ◽  
Vol 54 (4) ◽  
pp. 870-876 ◽  
Author(s):  
Gunter Spatz ◽  
Dieter Mueller-Dombois
Keyword(s):  
National Park ◽  
Tree Reproduction

Forest edge effects on Quercus reproduction within naturally regenerated mixed broadleaf stands

2013 ◽  
Vol 43 (10) ◽  
pp. 911-918 ◽  
Author(s):  
John M. Lhotka ◽  
Jeffrey W. Stringer
Keyword(s):  
Edge Effects ◽  
Radial Growth ◽  
Forest Tree ◽  
Forest Edge ◽  
Reproductive Capacity ◽  
Cross Sectional ◽  
Quercus Spp ◽  
Ring Analysis ◽  
Sectional Analysis ◽  
Tree Reproduction

This paper explores the influence of forest edge on the development of tree reproduction and the use of edge as a silvicultural tool for manipulating regeneration outcomes. Oak (Quercus spp.) reproduction was sampled 9 years following edge establishment along transects extending from 8 m into clearcut openings to 40 m into the adjacent intact forest. Trends showed that oak reproduction height in the intact forest was inversely related to distance from edge up to 20 m into the intact forest. Observed oak reproduction densities were greater within 20 m of edge than in distance intervals further into the intact forest. Tree-ring analysis of 106 seedlings was used to evaluate temporal responses associated with edge development. Cross-sectional analysis indicated a mean age of 13 years, 3 years prior to edge establishment. Increased growth was associated with edge establishment, and 10-year radial growth following edge creation showed a similar spatial pattern as height with oak seedlings within 20 m of the edge exhibiting significantly greater growth than those occurring furthest into the intact forest. This study suggests that forest edge can be used to provide environments useful in building reproductive capacity for species like oaks that require advance reproduction.

scholarly journals Proposing the solar wind-energy-flux hypothesis as a driver of interannual variation in tropical tree reproductive effort tropical tree reproduction

2019 ◽  
Author(s):  
J. Aaron Hogan ◽  
Christopher J. Nytch ◽  
John E. Bithorn ◽  
Jess K. Zimmerman
Keyword(s):  
Solar Wind ◽  
Wind Energy ◽  
Energy Flux ◽  
Environmental Conditions ◽  
Tropical Trees ◽  
Tropical Tree ◽  
Natural Phenomenon ◽  
Positive Anomaly ◽  
Solar Wind Energy ◽  
Tree Reproduction

AbstractA growing body of research documents how the El Niño Southern Oscillation (ENSO) results in short-term changes in terrestrial environmental conditions, with the potential to drive ecosystem processes as the duration and severity of ENSO events increases with anthropogenic climate change. An ENSO positive phase results in anomalous patterns of rainfall and temperature throughout the tropics that coincide with leaf flush and increased fruit production in tropical forests worldwide. However, our understanding of possible mechanisms underlying this natural phenomenon is limited. Furthermore, flowering in tropical trees anticipates ENSO development, motivating the continued search for a global phenological cue for tropical angiosperm reproduction. We propose the solar energy flux hypothesis: that a physical energy influx in the Earth’s upper atmosphere and magnetosphere generated by a positive anomaly in the solar wind preceding ENSO development, cues tropical trees to increase allocation of resources to reproduction. We show that from 1994-2013, the solar wind energy flux into the Earth’s magnetosphere (Ein) is more strongly correlated with the number of trees in fruit or flower in a Puerto Rican wet forest than the Niño 3.4 climate index, despite Niño 3.4 being a previously identified driver of interannual increases in reproduction. We discuss the idea that changes in the global magnetosphere and thermosphere conditions via solar wind-effects on global atmospheric circulation, principally a weaker Walker circulation, cue interannual increases tropical tree reproduction. This may be a mechanism that synchronizes the reproductive output of the tropical trees to changes in environmental conditions that coincide with ENSO. Thus, space weather patterns may help explain terrestrial biological phenomena that occur at quasi-decadal scales.

Food habits and caching behavior of urban grey squirrels

1980 ◽  
Vol 58 (5) ◽  
pp. 701-710 ◽  
Author(s):  
D. C. Thompson ◽  
P. S. Thompson
Keyword(s):  
Food Habits ◽  
Limiting Factor ◽  
Native Vegetation ◽  
Food Caching ◽  
Winter Diet ◽  
Large Numbers ◽  
Winter Food ◽  
Strong Seasonality ◽  
Grey Squirrels ◽  
Tree Reproduction

Grey squirrels are basically conservative in their choice of diet, selecting items closely resembling those used in habitats containing native vegetation. There is a strong seasonality in the use of various foods. The period of late spring appears to be the most critical for food supply; however, food did not appear to be a proximate limiting factor for this population. Food-caching and recovery behaviors show a strong seasonality. Food caching starts with the maturation of husked nuts and terminates with the onset of winter. Food recovery begins with cessation of food caching and terminates with the appearance of spring foods. Large numbers of nuts are cached and a large proportion (84.6%) of these are recovered. Cached food contributes significantly to the winter diet. The caching of food by an individual squirrel is beneficial to the general population and possibly to tree reproduction.

scholarly journals Inter-annual and decadal changes in teleconnections drive continental-scale synchronization of tree reproduction

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Davide Ascoli ◽  
Giorgio Vacchiano ◽  
Marco Turco ◽  
Marco Conedera ◽  
Igor Drobyshev ◽  
...  
Keyword(s):  
Continental Scale ◽  
Tree Reproduction

scholarly journals Long-term collapse in fruit availability threatens Central African forest megafauna

Science ◽  
2020 ◽  
Vol 370 (6521) ◽  
pp. 1219-1222
Author(s):  
Emma R. Bush ◽  
Robin C. Whytock ◽  
Laila Bahaa-el-din ◽  
Stéphanie Bourgeois ◽  
Nils Bunnefeld ◽  
...  
Keyword(s):  
Food Availability ◽  
Body Condition ◽  
National Park ◽  
Fruit Availability ◽  
Forest Elephants ◽  
Lope National Park ◽  
Tree Reproduction

Afrotropical forests host much of the world’s remaining megafauna, although these animals are confined to areas where direct human influences are low. We used a rare long-term dataset of tree reproduction and a photographic database of forest elephants to assess food availability and body condition of an emblematic megafauna species at Lopé National Park, Gabon. Our analysis reveals an 81% decline in fruiting over a 32-year period (1986–2018) and an 11% decline in body condition of fruit-dependent forest elephants from 2008 to 2018. Fruit famine in one of the last strongholds for African forest elephants should raise concern about the ability of this species and other fruit-dependent megafauna to persist in the long term, with potential consequences for broader ecosystem and biosphere functioning.

scholarly journals The ecology of tree reproduction in an African medium altitude rain forest

Biotropica ◽  
2018 ◽  
Vol 50 (3) ◽  
pp. 405-417 ◽  
Author(s):  
Fred Babweteera ◽  
Andrew J. Plumptre ◽  
Gabriela S. Adamescu ◽  
Luke P. Shoo ◽  
Colin M. Beale ◽  
...  
Keyword(s):  
Rain Forest ◽  
Tree Reproduction

scholarly journals Lianas reduce community-level canopy tree reproduction in a Panamanian forest

2017 ◽  
Vol 106 (2) ◽  
pp. 737-745 ◽  
Author(s):  
María M. García León ◽  
Laura Martínez Izquierdo ◽  
Felipe Nery Arantes Mello ◽  
Jennifer S. Powers ◽  
Stefan A. Schnitzer
Keyword(s):  
Community Level ◽  
Canopy Tree ◽  
Tree Reproduction
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