|Scientific Name:||Picoides borealis|
|Species Authority:||(Vieillot, 1809)|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Contributor/s:||Jackson, J. & McDearman, W.|
|Facilitator/s:||Benstead, P., Bird, J., Calvert, R., Isherwood, I., Taylor, J. & Wege, D.|
This species has been downlisted from Vulnerable on the basis of recent information about its population size. It is listed as Near Threatened because it is estimated to have a moderately small population, which is precautionarily suspected to be in slow decline based on known threats and local trends.
Picoides borealis was originally distributed throughout the south-eastern USA; however from the late 1800s to the mid-1900s, it declined rapidly due to the extensive alteration of mature pine forests (U.S. Fish and Wildlife Service 2008). During the late 20th century it continued to decline, undergoing a large and statistically significant overall decrease since the mid-1960s (Butcher and Niven 2007), and declining by at least 23% between 1980 and 1990 (James 1995). In 1999, it was limited to c.30 isolated populations (the largest in South Carolina and Florida), totalling c.4,700 groups or c.11,000 individuals and occupying just 4,000 km2 (Jackson 1994, Guynn 1997, J. A. Jackson in litt. 1999). However, the most recent data suggest that the population now numbers over 10,000 mature individuals, with estimates of 15,150 adults in 2006 (Department of Defense and U.S. Fish & Wildlife Service in litt. 2006) and c.14,500 adults in 2008 (W. McDearman in litt. 2010), as estimated using different methods. The population may now be stable, and possibly increasing (Department of Defense/U.S. Fish and Wildlife Service in litt. 2006, U.S. Fish and Wildlife Service 2008, W. McDearman in litt. 2010), but a slow overall decline is precautionarily suspected to be on-going, as local declines are known to be taking place. Its apparent recovery in many areas is the result of successful conservation efforts, including habitat management, nest-site provision and translocation of birds (U.S. Fish and Wildlife Service 2008), whilst improved knowledge has been acquired thanks to intensive studies.
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The number of adults was recently estimated at 15,150 (Department of Defense and U.S. Fish & Wildlife Service in litt. 2006) and c.14,500 based on 2008 data (W. McDearman in litt. 2010), thus the population is placed in the band for 10,000-19,999 mature individuals, assumed to be equivalent to c.15,000-30,000 individuals in total.|
|Habitat and Ecology:||It inhabits fire-sustained open pine-forest, dominated in half of its range by longleaf pine Pinus palustris and elsewhere by shortleaf P. echinata, slash P. elliotti, or loblolly P. taeda pines (J. A. Jackson in litt. 1999). It is a cooperative breeder, with each group requiring at least 80 ha of habitat. Nests are in cavities of living old-growth trees (100+ years old) and eggs are laid from late April to early June (Winkler et al. 1995). Foraging habitat preferences differ between the sexes and females are negatively influenced by the loss of old-growth trees (Jackson 2000). One study showed that adults were heavier, and both adults and nestlings apparently sourced more food in shortleaf and loblolly pine habitats than in longleaf pine forest (Schaefer et al. 2004).|
Because of its biology and dependence on old-growth forest, this species is said to be uniquely susceptible to rapid declines under inappropriate management regimes (J. R. Walters in litt. 2013). The long-term clearance and economic management of habitat has reduced the viability of all populations. From the late 1800s to the mid-1900s, the species decreased rapidly as mature pine forest was altered, primarily for timber harvest and agriculture (U.S. Fish and Wildlife Service 2008). Longleaf pine communities in the south-eastern USA may have originally covered c.24-37 million ha, but today fewer than 1.2 million ha remain (U.S. Fish and Wildlife Service 2008). The excessive cutting of old-growth forests is reported to still be taking place in some areas (J. A. Jackson in litt. 2012). Fragmentation has isolated nest-sites, making abandonment or group extirpation increasingly likely (Thomlinson 1995). Inbreeding depression has been highlighted as a potentially serious problem in small and isolated populations (Schiegg et al. 2006). Exempting landowners from the Endangered Species Act has resulted in rapid declines on private land (J. A. Jackson in litt. 1999). The translocation of birds to federal lands may swamp locally adapted gene pools (J. A. Jackson in litt. 1999). Southern pine beetle Dendroctonus frontalis infests cavities and kills nesting trees (Conner and Rudolph 1995) (although they have a positive effect on woodpecker foraging both as a food item, and by creating arthropod rich dead-wood habitat [Schaefer et al. 2004]). Beetle infestations have increased since habitat management for the woodpecker started in 1988, suggesting a possible connection (Conner and Rudolph 1995). Pileated Woodpeckers Dryocopus pileatus damage cavities (Saenz et al. 1998). Fire management (involving regular burning) has aided habitat restoration, but as human populations expand there is increasing pressure to suppress fires.
Conservation Actions Underway
The emphasis has been on site-specific rather than ecosystem-level management (J. A. Jackson in litt. 1999). Intensive activities include translocating young females from natal sites to groups lacking a female, constructing artificial cavities (Jackson 1994), and fitting restrictor plates to prevent D. pileatus enlarging cavities (Saenz et al. 1998). Habitat is managed (regular burning and understorey clearance) on some federal lands, but not always appropriately (Jackson 1994). In South Carolina the "Safe Harbor" scheme offers financial incentives to private landowners who undertake beneficial management prescriptions (Duncan et al. 2001). Local population increases have been dependent on intensive management, and it is not clear if such management ceased that habitat improvements are yet sufficient to support continued population increases without the additional intensive management (J. R. Walters in litt. 2013).
Conservation Actions Proposed
Monitor populations, especially where managed. Implement ecosystem-level management (James 1995). Provide incentives for landowners to maintain/enhance habitat (Kennedy et al. 1996, Bonnie 1997). Fit restrictor plates only where cavities are scarce (Saenz et al. 1998). Document and monitor translocations (J. A. Jackson in litt. 1999). Replace even-aged forest management with selective or no cutting (J. A. Jackson in litt. 1999). Establish habitat corridors (e.g. along highways) (Jackson 1994).
|Citation:||BirdLife International 2013. Picoides borealis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 24 April 2014.|
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