Spatial genetic structure, population dynamics, and spatial patterns in the distribution of<i>Ocotea catharinensis</i>from southern Brazil: implications for conservation

Montagna, Tiago; Lauterjung, Miguel Busarello; Candido-Ribeiro, Rafael; Silva, Juliano Zago da; Hoeltgebaum, Marcia Patricia; Costa, Newton Clóvis Freitas da; Reis, Maurício Sedrez dos

doi:10.1139/cjfr-2017-0446

Cited by 7 publications

(10 citation statements)

References 36 publications

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“…At the study site, seedlings from O. catharinensis present an aggregated spatial pattern; however, this pattern is independent of the spatial distribution of reproductive individuals (Montagna et al . ). Furthermore, a large quantity of deteriorated seeds were found rotten and infested by insect larvae under the crown of the few individuals that had high seed production.…”

Section: Discussionmentioning

confidence: 97%

“…However, a better understanding regarding flower and fruit abortion could indicate limiting factors to fruit production, valuable knowledge for the conservation of an endangered species with low recruitment into the seedling category (Montagna et al . ).…”

Section: Discussionmentioning

confidence: 97%

“…As several factors can explain abortion of flowers and fruits, such as pollen and resources limitation (Bawa & Webb 1984), only further research can clarify this question in O. catharinensis. However, a better understanding regarding flower and fruit abortion could indicate limiting factors to fruit production, valuable knowledge for the conservation of an endangered species with low recruitment into the seedling category (Montagna et al 2018).…”

Section: Mating Systemmentioning

confidence: 99%

“…Furthermore, a recent study has shown that O. catharinensis presents low recruitment into the seedling category, potentially harming the population dynamics in the long term (Montagna et al . ).…”

Section: Introductionmentioning

confidence: 97%

“…Because of the exploitation processes and the high fragmentation of the Atlantic Rainforest (Ribeiro et al 2009), O. catharinensis currently figures on the Brazilian List of Endangered Plant Species (MMA 2014) and also on the IUCN Red List (Varty & Guadagnin 1998), classified as vulnerable. Furthermore, a recent study has shown that O. catharinensis presents low recruitment into the seedling category, potentially harming the population dynamics in the long term (Montagna et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive ecology ofOcotea catharinensis, an endangered tree species

et al. 2018

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Ocotea catharinensis (Lauraceae) is an endangered tree species from the Brazilian Atlantic Rainforest. Currently, little is known about the reproductive ecology of this species. Aiming to propose conservation measures, we described aspects related to phenology, floral biology, pollination, seed dispersal and mating system of O. catharinensis. We conducted phenological observations in 62 individuals for 2 years. In one reproductive event, we evaluated nectar production, stigmatic receptivity and pollen viability. Floral visitors were observed, identified and classified on a scale of pollination effectiveness. Seed dispersers were observed and identified using camera traps. Finally, the mating system was evaluated through pollen/ovule ratios, experimental pollination treatments and genetic analysis with molecular markers. Ocotea catharinensis presented a supra-annual fruiting pattern with a substantial reduction of reproducing individuals from bud phase to ripe fruit phase. Several mechanisms prompting cross-fertilisation were identified, such as attractive, herkogamic and protogynic flowers. The main floral visitors and pollinators were from the Diptera order, and all seed dispersers were birds. The species presented a predominantly outcrossed mixed mating system with significant selfing rate (17.3%). Although based on restricted evidence, we hypothesised that selfing is an escape mechanism for situations unfavourable to cross-fertilisation. Specifically, for the studied population selfing is a response to reduced population size, which is caused by the non-reproduction of all potentially reproductive individuals and by past exploitation events. Therefore, conservation efforts should be able to enhance population sizes, as well as prevent overexploitation.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%