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. 2006 Mar 15;33(3):478–486. doi: 10.1111/j.1744-7429.2001.tb00201.x

Fruit Characteristics of Species Dispersed by the Black Lemur (Eulemur macaco) in the Lokobe Forest, Madagascar 1

Christopher Birkinshaw 1
PMCID: PMC7161794  PMID: 32313295

Abstract

ABSTRACT

I describe the fruit characteristics of species closely associated with black lemur seed dispersal (i.e., species that are often dispersed by die black lemur and only dispersed by the black lemur in die Lokobe Forest). A black lemur group was habituated and observed during the day and night for all months of die year (total 1272 h). When fruits were eaten, die plant species was identified, die maturity of the fruit and treatment of the seeds noted, and the fruit described in terms of ripe fruit color, husk thickness, fruit length, and seed length and width. Black lemur feces were searched for seeds; these were identified and signs of damage noted. Other potential dispersers feeding on the fruits of species eaten by the black lemur were also noted. The black lemurs were seen eating die fruits of 70 species. Of these, 51 species were defined as closely associated with black lemur dispersal and 16 species had seeds that were either often preyed upon or wasted by the black lemur, or were seen being eaten by other potential seed dispersers. Fruits of species in the former group were often dull colored (94% of species); rarely less than 1 cm long (6%); rarely had seeds less than 0.1 cm long or less than 0.1 cm wide (2 and 4%, respectively); never had seeds more than 4 cm long or greater than 2 cm wide; and quite often had either thick husks (49%) or thin husks (51%). In contrast, the fruits of the latter group were often brightly colored (75% of species) and nearly always had a thin husk (94%). Also, this latter group included more small and very large fruits and seeds than the former group. Fruit characteristics significantly associated with the former group were: dull color, thick husk, fruit length greater than 2 cm, seed length 1–4 cm, and seed width 1–2 cm. The extent to which these traits are the result of coevolution between plants and the guild of lemur dispersers that includes the black lemur is not clear, but a coevolved lemur–fruit syndrome remains a possibility.

RESUMES

Cette étude porte sur la description des caracteristiques des fruits appartenant aux espèces dont la dissemination des graines est étroitement liée au Eulemur macaco. Ces espèces sont definies comme étant souvent disséminees par E. macaco et uniquement disséminées par E. macaco dans la for○t de Lokobe. Dans le but d'identifier ces espéces, un groupe de E. macaco a été habituéà la présence humaine et observé jour et nuit pendant tous les mois de 1'année (en total 1272 h). Une fois le fruit consommé, I'espèce était identifyée, la maturityé du fruit ainsi que le traitement de la graine notés et le fruit était dàcrit en termé de couleur á maturityé, d'épaisseur de I'enveloppe, de longueur de fruit et de longueur et de largeur de graine. Par la suite, les féces sont recherchés afin d'identifier les graines qu'ils contiennent et routes signes d'endommagement de celles‐ci sont notés. Les autres agents de dissémination potentiels, consomma‐teurs des fruits appartenant aux espèces consommées par E. macaco, ont étéégalement notés. Les E. macaco ont été vu consommer les fruits de 70 espèces. De ces dernières, 51 espèces étaient définies comm.éaetant étroitement liées à la dissémination par E. macaco et les graines de 16 espèces sont soit consommées, soit gaspillées par E. macaco, soit ont été vu consommées par d'autres agents de dissémination potentiels. Les fruits des espèces appartenant au groupe précédent sont souvent d'une couleur sombre (94% des espèces), d'une longueur rarement < 1 cm (6%), avaient rarement des fruits < 0.1 cm de long ou < 0.1 cm de large (2 et 4% respectivement) et n'ont jamais des graines > 4 cm de long ou > 2 cm de large, et presque souvent avaient une enveloppe épaisse (49%) et presque souvent une enveloppe mince (51%). Par contre, les fruits du dernier groupe sont souvent d'une couleur claire (75% des espèces) 'et presque toujours ont une enveloppe mince (94%). De plus, ce groupe inclut plus de petits et de très larges fruits et graines que le premier groupe. Les classes des caractéristiques des fruits significativement associées au premier groupe sont: couleur sombre, enveloppe épaisse, longueur de fruit >2 cm, longueur de graine 1‐4 cm, et largeur de graine 1‐2 cm. Cependant, 1'importance du ro̧le joué par la coévolution entre les plantes et le groupe des lémuriens disséminateurs, comprennant Eulemur m., dans le développement des caractéristiques de ces fruits n'est pas connue.

Keywords: Key wonts: black lemur, coevolution, Eulemur macaco, frugivory, fruit characteristics, Madagascar, prosimian, seed dispersal, tropical rain forest

1

Received 15 June 1999; revision accepted 26 September 2000.

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