6540859
doi
10.5061/dryad.xpnvx0kj0
oai:zenodo.org:6540859
user-dryad
Unno, Akira
Hokkaido Research Organization
Royle, J.
United States Geological Survey
Sharing land via keystone structure: retaining naturally regenerated trees may efficiently benefit birds in plantations
Yamaura, Yuichi
Forestry and Forest Products Research Institute
doi:10.5281/zenodo.6529985
info:eu-repo/semantics/openAccess
Creative Commons Zero v1.0 Universal
https://creativecommons.org/publicdomain/zero/1.0/legalcode
temporary emigration
imperfect detection
spatial capture-recapture
<p class="MsoListParagraph"><span>Meeting food/wood demands with increasing human population and per-capita consumption is a pressing conservation issue, and is often framed as a choice between land sparing and land sharing. Although most empirical studies comparing the efficacy of land sparing and sharing supported land sparing, land sharing may be more efficient if its performance is tested by rigorous experimental design and habitat structures providing crucial resources for various species––keystone structures––are clearly involved. We launched a manipulative experiment to retain naturally regenerated broad-leaved trees when harvesting conifer plantations in central Hokkaido, northern Japan. We surveyed birds in harvested treatments, unharvested plantation controls and natural forest references one-year before the harvest and for three consecutive post-harvest years. We developed a hierarchical community model separating abundance and space-use (territorial proportion overlapping treatment plots) subject to imperfect detection to assess population consequences of retention harvesting. Application of the model to our data showed that retaining some broad-leaved trees increased total abundance of forest birds over the harvest rotation cycle. Specifically, pre-harvest survey showed that the amount of broad-leaved trees increased forest bird abundance in a concave manner (i.e., in a form of diminishing-return). After harvesting, a small amount of retained broad-leaved trees mitigated negative harvesting impacts on abundance though retention harvesting reduced the space-use. Nevertheless, positive retention effects on the post-harvest bird density as the product of abundance and space-use exhibited a concave form. Thus, small profit reductions were shown to yield large increases in forest bird abundance. The difference in bird abundance between clear-cutting and low amounts of broad-leaved tree retention increased slightly from the first to second post-harvesting years. We conclude that retaining a small amount of broad-leaved trees may be a cost-effective on-site conservation approach for the management of conifer plantations. Retention of 20-30 broad-leaved trees per ha may be sufficient to maintain higher forest bird abundance than clear-cutting over the rotation cycle. Retention approaches can be incorporated into management systems using certification schemes and best management practices. Developing an awareness of the roles and values of naturally regenerated trees is needed to diversify plantations.</span></p>
<p class="MsoNormal"><span>We upload the following four items:</span></p>
<ul>
<li><span>before_after_harvest-excl-edge-incl-large.R: R statistical code</span></li>
<li><span>bird_before_after_harvest.csv: bird census data we collected in the field</span></li>
<li><span>site_v2.csv: IDs of 23 surveyed stands</span></li>
<li><span>site_v3.csv: properties of 23 stands used in the analysis</span></li>
<li><span>parameter estimates - excl_edge_incl_large.xlsx: parameter estimates from the analysis by excluding edge records while including large-sized species<br></span></li>
</ul><p>Funding provided by: Mitsui and Company<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100006731<br>Award Number: R12-G2-225, R15-0025</p><p>Funding provided by: Japan Society for the Promotion of Science<br>Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100001691<br>Award Number: JP25252030, JP18H04154</p>
Zenodo
2022-12-13
info:eu-repo/semantics/other
6540858
user-dryad
1670986170.818827
3150
md5:72b13fae691b7e5f413b4d76046a4c23
https://zenodo.org/records/6540859/files/site_v3.csv
391
md5:6d200ed8eb5ca1e283c7bf2c2e2782d8
https://zenodo.org/records/6540859/files/site_v2.csv
17870
md5:d9d262a9b36956507182f32c7db3611d
https://zenodo.org/records/6540859/files/README.docx
293930
md5:c524eba69ac62f20df557c748a7b6f4a
https://zenodo.org/records/6540859/files/parameter_estimates_-_excl_edge_incl_large.xlsx
541562
md5:cfef5220383be874ad1afcd04754da9f
https://zenodo.org/records/6540859/files/bird_before_after_harvest.csv
public
10.5281/zenodo.6529985
Is derived from
doi