A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland

Abstract The Janzen‐Connell (JC) hypothesis predicts that conspecific negative density dependence contributes to the maintenance of plant diversity by lowering the recruitment of locally abundant plant species. The JC hypothesis is a widely evoked explanation for the high species diversity in tropic...

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Autores principales:	François P. Teste, Etienne Laliberté
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	coexistence and diversity fungal pathogen Kwongan vegetation Mediterranean non‐mycorrhizal Banksia attenuata seedling recruitment and survival Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/b9deb855354743929014f92152cfe180
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spelling	oai:doaj.org-article:b9deb855354743929014f92152cfe1802021-11-29T07:06:42ZA test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland2150-892510.1002/ecs2.3821https://doaj.org/article/b9deb855354743929014f92152cfe1802021-11-01T00:00:00Zhttps://doi.org/10.1002/ecs2.3821https://doaj.org/toc/2150-8925Abstract The Janzen‐Connell (JC) hypothesis predicts that conspecific negative density dependence contributes to the maintenance of plant diversity by lowering the recruitment of locally abundant plant species. The JC hypothesis is a widely evoked explanation for the high species diversity in tropical forests, but remains poorly tested in other species‐rich systems such as Mediterranean woodlands. As such, we tested if the JC operates and the role of soil‐borne oomycetes in a species‐rich Mediterranean woodland of Western Australia, where post‐fire recruitment can lead to high seedling densities, using the common Banksia attenuata as a case study. We attempted to decipher the effects of oomycete pathogens and distance from conspecific trees on intraspecific seedling survival and growth. Contrary to the JC hypothesis, we found little evidence of negative density dependence, but our results suggest positive density dependence survival under conspecific trees. Oomycete‐driven mortality in seedlings was also found regardless of the type of tree. Our results suggest that short‐term seedling recruitment patterns in this species‐rich, fire‐prone ecosystem do not follow the JC hypothesis. Future studies should explore whether negative conspecific density and distance dependence could play a greater role in later stages of the post‐fire recovery process.François P. TesteEtienne LalibertéWileyarticlecoexistence and diversityfungal pathogenKwongan vegetationMediterraneannon‐mycorrhizal Banksia attenuataseedling recruitment and survivalEcologyQH540-549.5ENEcosphere, Vol 12, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	coexistence and diversity fungal pathogen Kwongan vegetation Mediterranean non‐mycorrhizal Banksia attenuata seedling recruitment and survival Ecology QH540-549.5
spellingShingle	coexistence and diversity fungal pathogen Kwongan vegetation Mediterranean non‐mycorrhizal Banksia attenuata seedling recruitment and survival Ecology QH540-549.5 François P. Teste Etienne Laliberté A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
description	Abstract The Janzen‐Connell (JC) hypothesis predicts that conspecific negative density dependence contributes to the maintenance of plant diversity by lowering the recruitment of locally abundant plant species. The JC hypothesis is a widely evoked explanation for the high species diversity in tropical forests, but remains poorly tested in other species‐rich systems such as Mediterranean woodlands. As such, we tested if the JC operates and the role of soil‐borne oomycetes in a species‐rich Mediterranean woodland of Western Australia, where post‐fire recruitment can lead to high seedling densities, using the common Banksia attenuata as a case study. We attempted to decipher the effects of oomycete pathogens and distance from conspecific trees on intraspecific seedling survival and growth. Contrary to the JC hypothesis, we found little evidence of negative density dependence, but our results suggest positive density dependence survival under conspecific trees. Oomycete‐driven mortality in seedlings was also found regardless of the type of tree. Our results suggest that short‐term seedling recruitment patterns in this species‐rich, fire‐prone ecosystem do not follow the JC hypothesis. Future studies should explore whether negative conspecific density and distance dependence could play a greater role in later stages of the post‐fire recovery process.
format	article
author	François P. Teste Etienne Laliberté
author_facet	François P. Teste Etienne Laliberté
author_sort	François P. Teste
title	A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
title_short	A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
title_full	A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
title_fullStr	A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
title_full_unstemmed	A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland
title_sort	test of the janzen‐connell hypothesis in a species‐rich mediterranean woodland
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/b9deb855354743929014f92152cfe180
work_keys_str_mv	AT francoispteste atestofthejanzenconnellhypothesisinaspeciesrichmediterraneanwoodland AT etiennelaliberte atestofthejanzenconnellhypothesisinaspeciesrichmediterraneanwoodland AT francoispteste testofthejanzenconnellhypothesisinaspeciesrichmediterraneanwoodland AT etiennelaliberte testofthejanzenconnellhypothesisinaspeciesrichmediterraneanwoodland
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A test of the Janzen‐Connell hypothesis in a species‐rich Mediterranean woodland

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