Pollination ecology of Philodendron squamiferum (Araceae)

2002 ◽  
Vol 80 (3) ◽  
pp. 316-320 ◽  
Author(s):  
Marc Gibernau ◽  
Denis Barabé
Keyword(s):  
Heat Production ◽  
French Guiana ◽  
Botanical Garden ◽  
Floral Traits ◽  
Temperature Pattern ◽  
Scarab Beetle ◽  
Beetle Pollination ◽  
Similar Temperature ◽  
Two Peaks ◽  
Two Temperature

In French Guiana, inflorescences of Philodendron squamiferum Poepp. (Araceae) were regularly visited by the scarab beetle Cyclocephala simulatrix Hölne and (Scarabaeidae, Coleoptera) occasionally by Cyclocephala tylifera Hölne. The flowering cycle lasted 2 days, and the protogynous inflorescence exhibited features typical of beetle pollination (floral chamber, food rewards, flower heating). The spadix temperature was measured during the entire flowering cycle in French Guiana and at the Montreal Botanical Garden. Both sets of measurements gave a similar temperature pattern. The spadix warmed up twice at the beginning of each evening with no notable heat production between the two peaks. These two temperature peaks were well synchronized with the arrival and departure of beetles.Key words: beetle pollination, Cyclocephala, Dynastidae, floral traits, thermogenesis, French Guiana.

Thermogenesis in three Philodendron species (Araceae) of French Guiana

2000 ◽  
Vol 78 (5) ◽  
pp. 685-689 ◽  
Author(s):  
Marc Gibernau ◽  
Denis Barabé
Keyword(s):  
Air Temperature ◽  
Heat Production ◽  
French Guiana ◽  
Ambient Air ◽  
Taxonomic Significance ◽  
Ambient Air Temperature ◽  
Physiological Processes ◽  
Two Peaks ◽  
Temperature Heating

Spadix temperature was measured in three species of Philodendron: P. acutatum Schott, P. pedatum (Hooker) Kunth, and P. solimoesense A. C. Smith. These species showed two different patterns of spadix temperature during their flowering cycle. In P. acutatum and P. pedatum (subgenus Philodendron), the spadix warmed up twice during the beginning of each flowering night with a temperature not significantly different from that of the ambient air between the two peaks. In P. solimoesense (subgenus Meconostigma), the spadix temperature rose to 14°C above that of the ambient air during the first night, then it progressively cooled down but remained 3-6°C above the ambient air temperature. We propose that the heat production and the spadix temperature patterns observed may reflect different physiological processes and have a taxonomic significance in the genus Philodendron.Key words: Araceae, flowering cycle, flower temperature, heating flower.

Beetle pollination of Philodendron solimoesense (Araceae) in French Guiana

1999 ◽  
Vol 160 (6) ◽  
pp. 1135-1143 ◽  
Author(s):  
Marc Gibernau ◽  
Denis Barabé ◽  
Philippe Cerdan ◽  
Alain Dejean
Keyword(s):  
French Guiana ◽  
Beetle Pollination

Effects of heat production on the temperature pattern and stresses on frictional hardening of cylindrical components

1993 ◽  
Vol 28 (2) ◽  
pp. 163-168
Author(s):  
V. M. Maksimovich ◽  
P. B. Kratyuk ◽  
Yu. I. Babei ◽  
M. D. Maksimishin
Keyword(s):  
Heat Production ◽  
Temperature Pattern ◽  
Frictional Hardening

scholarly journals The cowl does not make the monk: scarab beetle pollination of the Neotropical aroidTaccarum ulei(Araceae: Spathicarpeae)

2012 ◽  
Vol 108 (1) ◽  
pp. 22-34 ◽  
Author(s):  
Artur Campos Dália Maia ◽  
Marc Gibernau ◽  
Airton Torres Carvalho ◽  
Eduardo Gomes Gonçalves ◽  
Clemens Schlindwein
Keyword(s):  
Scarab Beetle ◽  
Beetle Pollination

Floral geometric morphometrics unveils a new cauliflorous species of Aristolochia (Aristolochiaceae) from the Guiana Shield

Phytotaxa ◽  
2020 ◽  
Vol 474 (1) ◽  
pp. 1-14
Author(s):  
JOELCIO FREITAS ◽  
FAVIO GONZÁLEZ ◽  
ODILE PONCY ◽  
CHRISTIAN FEUILLET ◽  
ANDERSON ALVES-ARAÚJO
Keyword(s):  
New Species ◽  
Geometric Morphometrics ◽  
French Guiana ◽  
Geometric Analysis ◽  
Floral Traits ◽  
Guiana Shield ◽  
Species Complexes ◽  
A New Species ◽  
Shape And Size

Aristolochia wankeana (Aristolochiaceae), a new species from French Guiana and Guyana, is described and illustrated here. Floral traits, primarily of the shape and size of the perianth limb, examined through a morphometric geometric analysis, are diagnostic to distinguish the new species from its relatives A. cornuta and A. iquitensis. The species belongs to Aristolochia subser. Anthocaulicae, characterized by having extremely short cauliflorous racemes with scale-like, triangular subtending bracts. This is the first study that uses morphometrics for taxonomic purposes in Aristolochia, an approach that becomes promising to solve species complexes in this genus.

Thermoregulation in neonatal ruminants

1992 ◽  
Vol 15 ◽  
pp. 13-24 ◽  
Author(s):  
T. G. Rowan
Keyword(s):  
Heat Production ◽  
Thermal Environment ◽  
Core Body Temperature ◽  
Late Pregnancy ◽  
Spontaneous Respiration ◽  
Critical Temperatures ◽  
Neonatal Deaths ◽  
Ruminant Species ◽  
The United Kingdom ◽  
Similar Temperature

AbstractThis review is directed to thermoregulation in ruminants relative to weather and husbandry conditions of the United Kingdom in which the principal ruminant species are cattle and sheep. The main thermoregulatory demands for neonates, but not necessarily for older animals, are posed by cold rather than heat. Thermoregulation is critical to the survival of neonatal ruminants. On many farms, neonatal deaths are, for example, 20% of lambs born. Neonatal ruminants are precocial compared with many altrical neonatal mammals and have well developed thermoregulation which allows them to maintain homeothermy in many environments. However, at birth the neonatal ruminant moves from a very stable thermal environment, of similar temperature to its core body temperature, to a variable thermal environment which is 10 to 50°C colder than its core temperature. At birth the coat is wet and energy losses can be very high. To maintain homeothermy, heat production can usually be increased 3- to 5-fold above resting heat production. However, there are only limited quantities of tissue substrates available for this and the early intake of sufficient colostrum by the newborn is essential to continued heat production and survival. Nutrition in early and late pregnancy also affects the viability of, at least, young lambs: placental insufficiency may cause chronic prenatal hypoglycaemia and hypoxaemia which, postnatally, inhibits spontaneous respiration and restricts heat production. In calves, dystocia may cause acidosis and decreased heat production.The principal thermoregulatory mechanisms and some factors which affect their efficiency in newborn calves and lambs are presented, with consideration of the limitations of lower critical temperatures.

scholarly journals Monitoring of Moth Pests in Apple Tree Orchard

2018 ◽  
Vol 21 (2) ◽  
pp. 54-57
Author(s):  
Oleg Paulen ◽  
Radoslav Kobolka
Keyword(s):  
First Generation ◽  
Apple Tree ◽  
Cydia Pomonella ◽  
Codling Moth ◽  
Botanical Garden ◽  
Surrounding Area ◽  
Rainy Weather ◽  
Growing Conditions ◽  
Two Peaks ◽  
Summer Fruit

Abstract The work suggests importance of monitoring apple tree pests from moth group in growing conditions of Nitra, Slovakia. In 2014 there was observed occurrence of moths e.g. Codling moth (Cydia pomonella L.), Appleseed moth (Grapholita lobarzewskii Now.), Hawthorn berry moth (G. janthinana Dup.), and Summer fruit tortrix moth (Adoxophyes orana Fish. v. Roesl.) in the apple tree orchard located in the Botanical Garden of SUA in Nitra with help of pheromone traps. The date of first generation occurrence of Codling moth, Appleseed moth and Summer fruit tortrix moth was recorded on April 23. All the pests showed two peaks of flight activity, but with Hawthorn berry moth three periods of higher occurrence were recorded. The course of temperatures influenced number of pests trapped in traps remarkably. The number of pest individuals was highly influenced by rainy weather and lower temperatures in months when there was expected their highest harmfulness. The recorded values might be influenced by plant species diversity of the experimental orchard as well as that of the surrounding area.

scholarly journals GENETIC STUDIES OF MEMBRANE EXCITABILITY IN DROSOPHILA: LETHAL INTERACTION BETWEEN TWO TEMPERATURE-SENSITIVE PARALYTIC MUTATIONS

Genetics ◽  
1984 ◽  
Vol 108 (4) ◽  
pp. 897-911
Author(s):  
Barry Ganetzky
Keyword(s):  
Action Potentials ◽  
Double Mutant ◽  
Larval Instar ◽  
Temperature Sensitive ◽  
Gene Products ◽  
Membrane Excitability ◽  
Genetic Studies ◽  
Pharmacological Studies ◽  
Similar Temperature ◽  
Two Temperature

ABSTRACT Two mutants of Drosophila melanogaster, parats  1 (1-53.9) and napts (2-56.2) both display similar temperature-sensitive paralysis associated with blockage in the conduction of nerve action potentials, suggesting that the two gene products have a similar function. This idea is supported by the observation that the double mutant is unconditionally lethal. Genetic analysis of this synergistic interaction has revealed the following: 1) it specifically involves the para and nap loci; (2) all para alleles interact with napts, but the strength of the interaction varies in an allele-dependent fashion; (3) lethality of the double mutant occurs during the first larval instar with parats  1 but differs with other para alleles; (4) hypodosage of para  + causes lethality in a napts background. These results together with previous electrophysiological, behavioral and pharmacological studies of these mutants suggest that both para and nap affect sodium channels and possibly encode different subunits.

Sign in / Sign up

Export Citation Format

Share Document