A model comparison for daylength as a function of latitude and day of year

Forsythe, William C.; Rykiel, Edward J.; Stahl, Randal S.; Wu, Hsin‐I; Schoolfield, R. M.

doi:10.1016/0304-3800(94)00034-f

Cited by 344 publications

(226 citation statements)

References 11 publications

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“…Daylength data (variables 1-3 above) were calculated for each environment according to the function described by Forsythe et al (1995). The slope of the change in daylength across days (DLse and DLst) was calculated as the first derivative of the function at specified days after planting (more on this below).…”

Section: Discussionmentioning

confidence: 99%

Hallauer’s Tusón: a decade of selection for tropical-to-temperate phenological adaptation in maize

et al. 2014

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Crop species exhibit an astounding capacity for environmental adaptation, but genetic bottlenecks resulting from intense selection for adaptation and productivity can lead to a genetically vulnerable crop. Improving the genetic resiliency of temperate maize depends upon the use of tropical germplasm, which harbors a rich source of natural allelic diversity. Here, the adaptation process was studied in a tropical maize population subjected to 10 recurrent generations of directional selection for early flowering in a single temperate environment in Iowa, USA. We evaluated the response to this selection across a geographical range spanning from 43.05°(WI) to 18.00°(PR) latitude. The capacity for an all-tropical maize population to become adapted to a temperate environment was revealed in a marked fashion: on average, families from generation 10 flowered 20 days earlier than families in generation 0, with a nine-day separation between the latest generation 10 family and the earliest generation 0 family. Results suggest that adaptation was primarily due to selection on genetic main effects tailored to temperature-dependent plasticity in flowering time. Genotype-by-environment interactions represented a relatively small component of the phenotypic variation in flowering time, but were sufficient to produce a signature of localized adaptation that radiated latitudinally, in partial association with daylength and temperature, from the original location of selection. Furthermore, the original population exhibited a maladaptive syndrome including excessive ear and plant heights along with later flowering; this was reduced in frequency by selection for flowering time.

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Section: Discussionmentioning

confidence: 99%

Hallauer’s Tusón: a decade of selection for tropical-to-temperate phenological adaptation in maize

et al. 2014

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“…Daylength (dl) was calculated by taking into account latitude and date using the Forsythe et al (1995) model.…”

Section: Calibration Data Set: Multinet Datamentioning

confidence: 99%

Modelling planktic foraminifer growth and distribution using an ecophysiological multi-species approach

et al. 2011

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Abstract. We present an eco-physiological model reproducing the growth of eight foraminifer species (Neogloboquadrina pachyderma, Neogloboquadrina incompta, Neogloboquadrina dutertrei, Globigerina bulloides, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinella siphonifera and Orbulina universa). By using the main physiological rates of foraminifers (nutrition, respiration, symbiotic photosynthesis), this model estimates their growth as a function of temperature, light availability, and food concentration. Model parameters are directly derived or calibrated from experimental observations and only the influence of food concentration (estimated via Chlorophyll-a concentration) was calibrated against field observations. Growth rates estimated from the model show positive correlation with observed abundance from plankton net data suggesting close coupling between individual growth and population abundance. This observation was used to directly estimate potential abundance from the model-derived growth. Using satellite data, the model simulate the dominant foraminifer species with a 70.5% efficiency when compared to a data set of 576 field observations worldwide. Using outputs of a biogeochemical model of the global ocean (PISCES) instead of satellite images as forcing variables gives also good results, but with lower efficiency (58.9%). Compared to core tops observations, the model also correctly reproduces the relative worldwide abundance and the diversity of the eight species when using either satellite data either PISCES Correspondence to: F. Lombard (lombardfa@gmail.com) results. This model allows prediction of the season and water depth at which each species has its maximum abundance potential. This offers promising perspectives for both an improved quantification of paleoceanographic reconstructions and for a better understanding of the foraminiferal role in the marine carbon cycle.

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“…As fenofases (abscisão de folhas, brotamento, floração, frutificação e dispersão) foram correlacionadas com a precipitação e temperatura médias mensais do período de estudo (maio de 1995 a dezembro de 1997), com a precipitação e a temperatura médias mensais calculadas a partir da série histórica de janeiro de 1976 a dezembro de 2003 e o fotoperíodo médio mensal calculado de acordo com o modelo proposto por Forsythe et al (1995).…”

Section: Temperatura (ºC) Precipitação (Mm)unclassified

Fenologia de Chrysophyllum gonocarpum (Mart. & Eichler) Engl. (Sapotaceae) em floresta semidecídua do Sul do Brasil

Bianchini¹,

Pimenta²,

Santos³

2006

Rev. bras. Bot.

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-(Phenology of Chrysophyllum gonocarpum (Mart. & Eichler) Engl. (Sapotaceae) in semideciduous forest in southern Brazil). Phenological patterns of Chrysophyllum gonocarpum (Mart. & Eichler) Engl. were investigated from May 1995 to December 1997 in a tropical semideciduous forest in southern Brazil (23º27' S and 51º15' W). Forty trees were monthly observed for changes on leaf fall and flushing, flowering, and fruiting. The leaf fall occurred in the dry period while leaf flushing, flowering and dispersion occurred at the beginning of the wet season. Except fruiting, all phenophases were highly synchronized. The majority of individuals flowered annually, although they did not fruit annually. Leaf fall was negatively associated with rainfall and temperature and flowering was positively associated with daylength.

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A model comparison for daylength as a function of latitude and day of year

Cited by 344 publications

References 11 publications

Hallauer’s Tusón: a decade of selection for tropical-to-temperate phenological adaptation in maize

Hallauer’s Tusón: a decade of selection for tropical-to-temperate phenological adaptation in maize

Modelling planktic foraminifer growth and distribution using an ecophysiological multi-species approach

Fenologia de Chrysophyllum gonocarpum (Mart. & Eichler) Engl. (Sapotaceae) em floresta semidecídua do Sul do Brasil

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