Search results for "behavior"
showing 10 items of 13975 documents
Afforested fields benefit nutrient-demanding fungi
2015
Impaired ecosystems are converted back to natural ecosystems or some other target stage by means of restoration and management. Due to their agricultural legacy, afforested fields might be valuable compensatory habitats for rare fungal species that require nutrient-rich forest soils. Using a large-scale field experiment in Finland, we studied community composition of macrofungi (agarics and boletes) on former fields, which had been afforested as monocultures 20 years ago using native spruce Picea abies, pine Pinus sylvestris, and birch Betula pendula. We studied the effect of soil quality, tree species, and site on community composition and structure. Many nutrient-demanding as well as rare…
Influence of brood temperature and hygrometry variations on the development of the honey bee ectoparasite Varroa jacobsoni (Mesostigmata : Varroidae)
1990
The influence of different temperatures (from 26 to 39.5°C) and relative humidities (40 and 70%) on the development of Varma jacobsoni (Oudemans) was studied by placing newly capped and parasitized worker bee broods into thermostatically controlled chambers. In one set of experiments the temperature was kept constant, and in the second set, the parasitized worker broods were placed at a temperature of 40,41, or 42°C for a time varying from 0 to 24 h and then returned to 32.5°C. The optimal temperature for development of the mites was between 32.5 and 33.4°C, which corresponds to the brood temperature of Apis mellifera L. Above 36.5°C, reproduction of varroa females was significantly reduced…
‘False resupination’ in the flower-pairs of Thalia (Marantaceae)
2016
Abstract Resupination, i.e., the turn by 180°, arranges zygomorphic flowers in a suitable position for pollination. It is well-known from orchids, but also occurs in further angiosperm families. Within the genus Thalia L. (Marantaceae), T. dealbata has erect and T. geniculata pendulous inflorescences. Nevertheless, in both species the zygomorphic flower-pairs show the right position for pollination. Thus, resupination is expected in Marantaceae. To reconstruct spatial arrangement, flower development was investigated from meristem formation to anthesis. Early morphogenetic stages were analysed under the scanning electron microscope, late stages were documented by time-lapse records. Gravity …
Nectar robbing does not affect female reproductive success of an endangered Antirrhinum species, Plantaginaceae
2019
ABSTRACTBackground: Nectar robbers in many plant species affect female reproductive success, usually decreasing the amount of seed produced by plants, which can affect populations persistence.Aims:...
Annual cycle of starch content in rhizomes of the forest geophytes Anemone nemorosa and Aegopodium podagraria
1997
Summary Starch contents of rhizomes of Anemone nemorosa L. and Aegopodium podagraria L. were measured enzymatically. The results were compared to the developmental stage determined weekly. Minimum starch contents were measured few weeks after the begin of the growth period, then the starch contents increased during leaf expansion to reach its maximum immediately before the yellowing of the leaves. During the yellowing starch contents did not increase further due to rhizome growth. Anemone nemorosa had a higher starch content than Aegopodium podagraria. This can be explained in context of the different growth strategies of the plants. The first species follows the dominance strategy of growt…
Sex- and size-selective harvesting of corkwing wrasse (Symphodus melops)—a cleaner fish used in salmonid aquaculture
2016
Fishery-induced changes in sex ratios can have negative effects on reproductive rates and affect sexual selection and evolutionary trajectories. Here, we investigate sex- and size-selectivity of the fishery for corkwing wrasse (Symphodus melops) in Western Norway. The males that build and guard nests (nesting males) grow faster than females and sneaker males. Corkwing wrasse were tagged (n = 1057) during (May–June) and after (July) the spawning period in 2014 within a no-take site and in a nearby site open for fishing. We monitored the fishery within and nearby the tagging sites from June to October and sampled recaptures on all commercial fishing trips. Fishing mortality was higher for nes…
2021
Without insights into the threats affecting species across their distributions and throughout their annual cycles, effective conservation management cannot be applied. The Whenua Hou diving petrel Pelecanoides whenuahouensis (WHDP) is a Critically Endangered small seabird whose offshore habits and threats are poorly understood. We tracked WHDPs year-round in 2015/16, 2017/18, and 2018/19 using global location-sensing immersion loggers to identify offshore distribution, movements, behaviour, and overlap with commercial fishing effort. During the breeding period, WHDPs ranged from southern Aotearoa (New Zealand) to Maukahuka (Auckland Islands). After breeding, WHDPs migrated southwest towards…
From a Crisis Discipline Towards Prognostic Conservation Practise: An Argument for Setting Aside Degraded Habitats
2017
New national and regional Annex I Habitat records: from #21 to #25
2021
New Italian data on the distribution of the Annex I Habitats 3170*, 6110*, 91E0*, 9320, 9330 are reported in this contribution. Specifically, one new occurrence in Natura 2000 sites is presented and six new cells are added in the European Environment Agency 10 km × 10 km reference grid. The new data refer to the Italian administrative regions of Sardinia, Sicily and Umbria.
Studies on the genus Capparis L. (Capparaceae) in Lao PDR. II: A new species from the Khammouan karst
2017
A new species of Capparis, Capparis lanceolatifolia, is described and illustrated from central Lao PDR, where it is known from a single limestone doline in the Hinboun District, Khammouan Province. The new species is characterized by narrowly lanceolate leaves, racemose inflorescence bearing trifid bracts and small size of flower. Its affinities with related taxa and conservation status are discussed.