Tree recruitment failure in old‐growth forest patches across human‐modified rainforests

2021 ◽  
Author(s):  
Ricard Arasa‐Gisbert ◽  
Víctor Arroyo‐Rodríguez ◽  
Carmen Galán‐Acedo ◽  
Jorge A. Meave ◽  
Miguel Martínez‐Ramos
Keyword(s):  
Old Growth ◽  
Forest Patches ◽  
Tree Recruitment ◽  
Recruitment Failure ◽  
Old Growth Forest

Fuel succession in a western hemlock/Douglas-fir forest

1987 ◽  
Vol 17 (7) ◽  
pp. 697-704 ◽  
Author(s):  
James K. Agee ◽  
Mark H. Huff
Keyword(s):  
Aboveground Biomass ◽  
Fire Behavior ◽  
Herb Layer ◽  
Old Growth ◽  
Forest Patches ◽  
Surface Fire ◽  
Old Growth Forest ◽  
Tree Component ◽  
Natural Stands ◽  
Over Time

Fuel succession was quantified for a 515-year chronosequence in a Tsugaheterophylla/Pseudotsugamenziesii forest. Postfire stand ages selected were 1, 3, 19, 110, 181, and 515. After initial reductions due to mortality from fire in the first 3 years, live aboveground biomass in the tree component increased over time to over 1100 t/ha. Shrub and herb layer biomass was highest in year 19 and year 515. Dead aboveground biomass had different trends for different fuel size classes; normalized fuel loadings of five dead and down fuel categories peaked at four different stand ages: 1-h and 10-h timelag (TL) fuels, age 1; 100-h TL fuels, age 19; 1000-h TL fuels, age 110; >1000-h TL fuels, age 515. Surface fire behavior was highest early in the sere and lowest at ages 110–181. Old-growth forest patches appear to be best buffered against forest fire by mature forest patches rather than old growth or recently burned natural stands.

Birds in patches of old-growth ash forest, in a matrix of younger forest

1998 ◽  
Vol 4 (2) ◽  
pp. 111 ◽  
Author(s):  
Richard H. Loyn
Keyword(s):  
Forest Structure ◽  
Patch Size ◽  
Forest Birds ◽  
Old Growth ◽  
Forest Patches ◽  
Bird Abundance ◽  
Old Growth Forest ◽  
Generalized Linear Modelling ◽  
Mountain Ash ◽  
Context Variables

Birds were studied at 57 sites in Mountain Ash forests in the Central Highlands of Victoria, Australia in spring and summer 1995/96. The sites represented 41 patches of old-growth forest (up to 390 ha in size) in a matrix of regrowth mostly from severe fires in 1939 (57 years previously), with multiple sites in the four largest patches of old-growth and eight sites in 1939 regrowth. Relative bird abundance was assessed by an area-search technique. Generalized linear modelling was used to develop predictive models by regressing abundance of groups of bird species against patch size, isolation and some basic habitat and context variables. Total bird abundance (of all species combined) tended to be higher in old-growth patches than in 1939 regrowth, but not significantly. There was no trend in total abundance with patch size or isolation. Fruit-eating birds tended to be commonest in small patches. Bark-foragers and uncommon birds favoured large patches, though the latter were most common in 1939 regrowth. More variation was explained by habitat and context variables such as aspect, altitude and forest structure. Unevenaged forest structure was often associated with small patches. It was concluded that old-growth forest patches can have similar values per hectare for forest birds whether they are large or small. The regrowth forest matrix appears to protect small patches from factors which reduce densities of forest birds in small forest patches in farmland. The data support the current policy of retaining all old-growth ash forest patches. A range of factors should be considered in selecting regrowth stands of various sizes to regrow as old forest of the future, including their intrinsic potential to develop particular habitats and produce a mix of forest stuctures in the landscape.

Home range and habitat use by Magellanic Woodpeckers in an old-growth forest of Patagonia

2014 ◽  
Vol 44 (10) ◽  
pp. 1265-1273 ◽  
Author(s):  
Valeria Ojeda ◽  
Laura Chazarreta
Keyword(s):  
Home Range ◽  
Woody Debris ◽  
Home Range Size ◽  
Habitat Characteristics ◽  
Home Ranges ◽  
Nothofagus Pumilio ◽  
Old Growth ◽  
Forest Patches ◽  
Argentine Patagonia ◽  
Old Growth Forest

The Magellanic Woodpecker (Campephilus magellanicus (King, 1827)) is a large, vulnerable species exhibiting geographic range retraction. We analyzed the size and location of forest areas used by these woodpeckers in consecutive years (2010–2012), as related to habitat characteristics, in an old-growth lenga (Nothofagus pumilio (Poepp et Endl.) Krasser) forest of Argentine Patagonia. Woodpeckers were tracked during the postbreeding season, and forest features were evaluated in plots within territories. Woodpecker density was 1.01 territories·100 ha–1. The resident population apparently saturates the forest available in the study site; hence, territorial disputes were frequent between all pairs of adjacent families. Families used 39.3 ± 13.6 ha during the postreproductive season and 63.2 ± 12.3 ha across the three seasons, with interannual variability in both location and size of the areas used. Abundances of large live trees and of coarse woody debris were correlated with smaller, presumably high-quality, home ranges. Other forest attributes that are often important in woodpecker habitat (e.g., snag density) had little relationship with home-range size, but the high availability of resources in old-growth forests may mask their potential importance in a poorer quality habitat. Our results show that Magellanic Woodpecker family groups require a minimum of 100 ha in old-growth forest habitat; thus, forest patches in less favourable forest conditions (e.g., younger, managed, fragmented, mixed forests) should probably be much larger to support a resident pair or family. This habitat size would be a provisional minimum threshold to be used in management decisions involving the forests of Patagonia until alternative figures are derived from studies across multiple forest types.

Influence of logjam-formed hard points on the formation of valley-bottom landforms in an old-growth forest valley, Queets River, Washington, USA

2006 ◽  
Vol 65 (1) ◽  
pp. 147-155 ◽  
Author(s):  
David R. Montgomery ◽  
Tim B. Abbe
Keyword(s):  
Riparian Forest ◽  
Feedback Mechanism ◽  
Old Growth ◽  
Forest Patches ◽  
Valley Bottom ◽  
Field Surveys ◽  
Old Growth Forest ◽  
Channel Avulsion ◽  
Queets River ◽  
Channel Patterns

AbstractField surveys and radiocarbon dating of buried logjams in the floodplain of an old-growth forest river demonstrate the formation of erosion-resistant “hard points” on the floodplain of the Queets River, Washington. These hard points provide refugia for development of old-growth forest patches in frequently disturbed riparian environments dominated by immature forest. Our surveys show that local bed aggradation associated with logjams not only influences channel patterns and profiles but leads to development of a patchwork of elevated landforms that can coalesce to form portions of the valley bottom with substantial (i.e., 1 to > 4 m) relief above the bankfull elevation. In addition, logjam-formed hard points promote channel avulsion, anastomosing morphology, and growth of mature patches of floodplain forest that, in turn, provide large logs needed to form more logjam-formed hard points. Hence, our findings substantiate the potential for a feedback mechanism through which hard points sustain complex channel morphology and a patchwork floodplain composed of variable-elevation surfaces. Conversely, such a feedback further implies that major changes in riparian forest characteristics associated with land use can lead to dramatic simplification in channel and floodplain morphology.

scholarly journals Die Suche nach altem Wald in der Schweiz

2015 ◽  
Vol 166 (2) ◽  
pp. 67-74 ◽  
Author(s):  
Rita Bütler ◽  
Markus Bolliger ◽  
Brigitte Commarmot
Keyword(s):  
Forest Cover ◽  
Dead Wood ◽  
Stand Structure ◽  
National Forest Inventory ◽  
Old Growth ◽  
Forest Patches ◽  
Natural Processes ◽  
Old Growth Forest ◽  
Veteran Trees ◽  
Old Growth Forests

The search for old-growth forests in Switzerland Old-growth forests and stands have multiple values, such as biological, scientific, socioeconomic, aesthetic, spiritual and cultural ones, but they are very rare in central Europe. Currently, an overview about the existence and size of old-growth forest patches in Switzerland is missing. We propose a definition for old-growth forests worth preserving based on ten criteria: 1) presence of veteran trees, 2) significant biomass, 3) heterogeneous stand structure including senescent and decaying stages, 4) presence of natural processes and disturbances, 5) high dead wood volume (at least 30 m3/ha) and a large diversity of dimensions and decay stages of dead wood pieces, 6) autochthonous tree species, 7) diverse and natural species assemblages, 8) only extensive or no harvesting for the last 50 years, 9) long continuity of forest cover, 10) minimal area of 30 ha for old-growth forests and 1 ha for old-growth stands. When searching for old-growth forests and stands worth preserving, quantitative criteria from the National Forest Inventory and other sources should also be used. We call on all forest specialists to identify old-growth patches, to inform the population and decision makers about their high value, and to protect them in an adequate manner as a unique natural heritage.

PREDICTING OCCUPANCY FOR THE SIBERIAN FLYING SQUIRREL IN OLD-GROWTH FOREST PATCHES

2002 ◽  
Vol 12 (4) ◽  
pp. 1188-1198 ◽  
Author(s):  
Pasi Reunanen ◽  
Ari Nikula ◽  
Mikko Mönkkönen ◽  
Eija Hurme ◽  
Vesa Nivala
Keyword(s):  
Old Growth ◽  
Forest Patches ◽  
Flying Squirrel ◽  
Old Growth Forest ◽  
Siberian Flying Squirrel

scholarly journals Threatened birds of the Angolan Central Escarpment: distribution and response to habitat change at Kumbira Forest

Oryx ◽  
2014 ◽  
Vol 49 (4) ◽  
pp. 727-734 ◽  
Author(s):  
Aimy Cáceres ◽  
Martim Melo ◽  
Jos Barlow ◽  
Paulo Cardoso ◽  
Francisco Maiato ◽  
...  
Keyword(s):  
Forest Cover ◽  
Land Use Changes ◽  
Secondary Growth ◽  
Bird Species ◽  
Bird Community ◽  
Old Growth ◽  
Forest Patches ◽  
Old Growth Forest ◽  
Remote Sensing Techniques ◽  
Representative Area

AbstractKumbira Forest is the best representative area of Angola's Central Escarpment and the only site known to hold significant populations of four of the five threatened endemic bird species of this habitat. However, the forest is disappearing as a result of human activities. Remote-sensing techniques were used to assess changes in forest cover, and bird and habitat surveys were performed to assess the effect of land-use changes on endemic species and the bird community. No relationships could be established between the presence of endemics and habitat and landscape variables. This lack of effect may be attributable to the low number of records and compounded by the mosaic structure of the landscape. Although forest cover has been maintained in Kumbira, old-growth forest has been replaced by secondary growth in many areas. Nevertheless these secondary-growth forest patches can maintain a bird community similar to that found in old-growth forest.

Tradable Disturbance Permits for Old-growth Forest Conservation: Experimental Evaluation of Implementation Options

2017 ◽  
Vol 7 (1-2) ◽  
pp. 73-107
Author(s):  
Orsolya Perger ◽  
Curtis Rollins ◽  
Marian Weber ◽  
Wiktor Adamowicz ◽  
Peter Boxall
Keyword(s):  
Experimental Evaluation ◽  
Forest Conservation ◽  
Old Growth ◽  
Old Growth Forest
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