03884nab a2200265 i 4500003000900000005001700009008004100026040001800067072000800085072000800093100002600101100002800127100003500155100003300190100003300223245012600256500007600382520284200458650001403300650002503314650001403339650001303353773017403366856007803540BR-BrBNA20250306113828.0250306b2015    bl.qr|pooa||| 00| 0 por |  aBR-BrBNAbpor  aF40  aF70  aSouza, Bruno Cruz de   aOliveira, Rafael Silva   aAraújo, Francisca Soares de   aLima, André Luiz Alves de   aRodal, Maria Jesus Nogueira   aDivergências funcionais e estratégias de resistência à seca entre espécies decíduas e sempre verdes tropicais  aPublicação on-line; 44 ref.; 2 tables; 5 illus.; Summaries (En, Pt)  a

Resumo

Analisamos a variação funcional entre espécies decíduas (ED) e sempre verdes (ESV) para compreender
as divergências nas estratégias de tolerância e evitação à seca. O estudo foi realizado em um fragmento de
floresta tropical sazonalmente seca, localizada no munícipio de Pentecoste (3°47'S,39°16'W), Ceará, Brasil.
Mensuramos 17 traços funcionais foliares em 17 ED e cinco ESV, sendo 12 morfofuncionais, um fenológico
e quatro fisiológicos. Verificamos que as ED exibiram maior taxa de fotossíntese por massa (Amassa), menor
longevidade foliar (LF) e massa foliar específica (MFE) quando comparadas às sempre verdes. Esses traços
foram considerados traços-chaves preditores das estratégias de evitação e tolerância à seca. As ED e ESV
apresentaram uma demanda conflitante entre tolerância à seca e taxa fotossintética, pois a LF foi negativamente
correlacionada com à Amassa. Embora tenham demonstrado diferenças claras na MFE e LF não observamos
diferenças significativas na Aárea e gs, consequentemente, ED e ESV não diferiram na eficiência no uso da
água durante o período chuvoso. Apesar da variabilidade substancial dentro do grupo, todas as ED exibem
estratégia de evitação à seca enquanto que ESV exibem um conjunto de traços funcionais foliares relacionados
a estratégia de tolerância à seca.

Palavras-chave: Grupos fenológicos, tolerância à seca, evitação à seca.


Abstract

We analyzed the functional variation between deciduous and evergreen species to understand the differences
across the strategies of avoidance and tolerance to drought. Our study was carried in a fragment of seasonally
dry tropical forest located in the city of Pentecoste (3°47‘S, 39°16’W), Ceará, Brazil. We measured 17 func- tional 
leaf traits in 17 deciduous and five evergreen species, being 12 morphofunctional, one phenological
and four physiological. We found that deciduous species exhibited greater Amass, lower leaf lifespan (LL)
and leaf mass per area (LMA) than evergreen species. These traits were considered key predictor traits of
avoidance and drought tolerance strategies. Deciduous and evergreen species showed a trade-off between
drought tolerance and photosynthetic rate, LL was negatively correlated with Amass. Although we have shown
clear differences in LMA and LL not observed significant differences in Aareaand gs, consequently, deciduousspecies 
and evergreen species did not find significant differences in WUEi and WUE. Despite substantial
variability within the group, all deciduous species fall predominantly in the drought avoidance strategy, while
evergreen species display a suite of traits related to drought tolerance.

Key words: Phenological groups, drought tolerance, drought avoidance.   aFENOLOGIA  aRESISTÊNCIA A SECA  aESPÉCIE  aÁRVORE0 0709dRio de Janeiro-RJ Jardim Botanico do Rio de Janeiro 1935o2025-1382tRodriguésia (Brazil)x0370-6583; 2175-7860 on-linegv. 66(1) p. 021-032; (2015)wBR2024004978  uhttps://www.scielo.br/j/rod/a/HpQTYnF7tw93ywLCSNSVtCF/?format=pdf&lang=pt