Declining old‐forest species as a legacy of large trees lost

Aim Global declines in large old trees from selective logging have degraded old‐forest ecosystems, which could lead to delayed declines or losses of old‐forest‐associated wildlife populations (i.e., extinction debt). We applied the declining population paradigm and explored potential evidence for ex...

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Vydáno v:	Diversity & distributions Ročník 24; číslo 3; s. 341 - 351
Hlavní autoři:	Jones, Gavin M., Keane, John J., Gutiérrez, R. J., Peery, M. Zachariah, Mac Nally, Ralph
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford John Wiley & Sons, Inc 01.03.2018
Témata:	Biodiversity biodiversity conservation California Canopies canopy Colonies & territories declining population paradigm ecosystems Endangered & extinct species Extinction Forest ecosystems Forest management forest restoration forest types Forests Landscape landscapes Logging Montane environments montane forests Mountain forests mountains National forests National parks occupancy modelling Population decline population dynamics probability Protected species Sierra Nevada (California) Species extinction spotted owl Strix occidentalis Terrestrial ecosystems Territory Trees Wildlife Wildlife conservation Sierra Nevada (California) California
ISSN:	1366-9516, 1472-4642
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Shrnutí:	Aim Global declines in large old trees from selective logging have degraded old‐forest ecosystems, which could lead to delayed declines or losses of old‐forest‐associated wildlife populations (i.e., extinction debt). We applied the declining population paradigm and explored potential evidence for extinction debt in an old‐forest dependent species across landscapes with different histories of large tree logging. Location Montane forests of the Sierra Nevada, California, USA. Methods We tested hypotheses about the influence of forest structure on territory extinction dynamics of the spotted owl (Strix occidentalis) using detection/non‐detection data from 1993 to 2011 across two land tenures: national forests, which experienced extensive large tree logging over the past century, and national parks, which did not. Results Large tree/high canopy cover forest was the best predictor of extinction rates and explained 26%–77% of model deviance. Owl territories with more large tree/high canopy cover forest had lower extinction rates, and this forest type was ~4 times more prevalent within owl territories in national parks (x¯ = 19% of territory) than national forests (x¯ = 4% of territory). As such, predicted extinction probability for an average owl territory was ~2.5 times greater in national forests than national parks, where occupancy was declining (λ¯^<1) and stable (λ¯^=1), respectively. Large tree/high canopy cover forest remained consistently low, but did not decline, during the study period on national forests while owl declines were ongoing—an observation consistent with an extinction debt. Main conclusions In identifying a linkage between large trees and spotted owl dynamics at a regional scale, we provide evidence suggesting past logging of large old trees may have contributed to contemporary declines in an old‐forest species. Strengthening protections for remaining large old trees and promoting their recruitment in the future will be critical for biodiversity conservation in the world's forests.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1366-9516 1472-4642
DOI:	10.1111/ddi.12682