scholarly journals Local distribution pattern of Virga pilosa (L.) Hill. (Dipsacaceae) as an effect of its life and dispersal strategy

2020 ◽  
Vol 59 (1) ◽  
pp. 15-27
Author(s):  
Rafał Bernard ◽  
Julian Chmiel
Keyword(s):  
Distribution Pattern ◽  
Animal Communication ◽  
Reproductive Potential ◽  
Life Strategy ◽  
Local Distribution ◽  
Habitat Conditions ◽  
Dispersal Strategy ◽  
Compact Range ◽  
Wielkopolski National Park ◽  
Plant Animal Interactions

Abstract A new locality of regionally alien and rare Virga pilosa was recorded outside the compact range of the species in the Wielkopolski National Park, midwestern Poland. It probably appeared as a result of unintentional anthropochory. Local distribution pattern of V. pilosa in micro- and mesoscale was described and interpreted in the light of life and dispersal strategy and habitat conditions of the species. Accidental epizoochory and unintentional anthropochory could have been responsible for the mesoscale distribution pattern with population units scattered along human and animal communication routes. Close dense autochory together with the species CR life strategy with a strong competitive component were responsible for microscale distribution pattern alternating in space and time, but always mosaic, including vegetative, generative and mixed patches. The distribution pattern was also influenced by the occurrence of the required combination of the moderately light, moderately moist and nitrogen-rich habitat conditions with favourable human-induced disturbance. Some data on the form of growth, reproductive potential and dispersal mode of the species, as well as on plant-animal interactions were also included.

scholarly journals Parietaria pensylvanicu Mühlenb. ex Willd. - potentialities of migration from park habitats to segetal communities

2013 ◽  
Vol 53 (1) ◽  
pp. 65-74
Author(s):  
Anna K. Sawilska ◽  
Józef Misiewicz
Keyword(s):  
North America ◽  
Life Strategy ◽  
Vegetable Crops ◽  
Habitat Conditions ◽  
Vegetation Season ◽  
Type Selection ◽  
Density And Biomass ◽  
Segetal Communities

Parietaria pensvlvanica Mühlenb ex. Willd is a species native to North America, whose occurrence in Poland was first reported in Bydgoszcz in 1991. Its biology and ecology has been researched since 1996. The present paper discusses measurements and phenological observations carried out on four selected populations during the vegetation season in 1997. The aim of the research was to determine potentialities of the migration of P. pensylvanica from park habitats to segetal communities, on the basis of a defined life strategy of the examined populations. The analysis focused on the dynamics of density and biomass as well as on the weight of 1000 nucules, against the habitat conditions. The findings demonstrated that the investigated species was characterised by a set of life strategy properties referred to as C-S-R or S-R, and was subject to the "r"-type selection. P. pensylvanica has become an integral part of the Bydgoszcz flora and is likely to expand into segetal communities of agricultural and vegetable crops.

MONITORING REPRODUCTIVE POTENTIAL OF AZOV SEA STURGEONS UNDER PRESENT HABITAT CONDITIONS

1999 ◽  
Vol 15 (4-5) ◽  
pp. 290-291
Author(s):  
G.G. Kornienko ◽  
S.I. Dudkin ◽  
T.V. Lozhichevskaya
Keyword(s):  
Reproductive Potential ◽  
Habitat Conditions ◽  
Azov Sea

scholarly journals AGGREGATION OF Hotothuria (Metriatyla) albivenfer SEMPER (1868) (ESHIN9DERMATA: ASPIDOGHIROTIDA) ON SEAGRASS AREA OF MEDANA BAY WEST LOMBOK

2017 ◽  
Vol 14 (1) ◽  
pp. 37
Author(s):  
Pradina Purwati ◽  
Pitra Widianwary ◽  
Sigit Anggoro Putro Dwiono ◽  
Oktavianto Samir
Keyword(s):  
Distribution Pattern ◽  
Global Positioning System ◽  
Mapping Technique ◽  
Positioning System ◽  
Local Distribution ◽  
Individual Number ◽  
Global Positioning ◽  
The Individual

Mapping technique has not been popular in holothurian monitoring procedures. We introduced the use of global positioning system to determine the local distribution pattern and estimate the individual number of Holothuria albiventer al Medana Bay, West Lombok, Indonesia.

scholarly journals The grouping system and local distribution pattern analysis of Javan green peafowl (Pavo muticus muticus, Linnaeus 1758) population in Baluran and Alas Purwo National Parks, East Java, Indonesia

2018 ◽  
Vol 19 (5) ◽  
pp. 1690-1695
Author(s):  
JARWADI BUDI HERNOWO ◽  
HADI SUKADI ALIKODRA
Keyword(s):  
Distribution Pattern ◽  
National Parks ◽  
National Park ◽  
Pattern Analysis ◽  
Female Group ◽  
Local Distribution ◽  
Group System ◽  
Number Of Individuals ◽  
Pavo Muticus ◽  
Green Peafowl

Hernowo JB, Alikodra HS. 2018. The grouping system and local distribution pattern analysis of Javan green peafowl (Pavo muticus muticus, Linnaeus 1758) population in Baluran and Alas Purwo National Parks, East Java, Indonesia. Biodiversitas 19: 1690-1695. The Javan green peafowl population lives in a group system. The population applies a small size group system. The distribution of the birds in Java Island is randomly fragmented and isolated in several types of habitat and each has a small number of individuals in every group. Baluran and Alas Purwo National Parks, East Java, Indonesia as part of Javan green peafowl (Pavo muticus muticus, Linnaeus 1758) distributions have been selected for the study on the grouping system and the analysis of local distribution. The research was aimed at obtaining data and information on the grouping system and local distribution of Javan green peafowl population in Baluran and Alas Purwo National Park. The number of individuals and groups was counted by applying a transect method and a concentration method on every type of habitat where peafowls are present. The distribution pattern data were analyzed by using a formula (Ludwig and Reynolds 1988). The results indicate that Javan green peafowl population is living in small groups (2-4 birds). There are 5 types of Javan green peafowl groups in Baluran National Park (BNP) and Alas Purwo National Park (APNP). The dominant group is adult female group consisting 3 individual members. The leader of the group is a female bird. Adult males live in solitary. The group system among Javan green peafowl populations is a strategy of the birds. Local distribution of Javan green peafowl populations in Baluran and Alas Purwo National Parks is mostly in the form of clumped dispersion.

scholarly journals Local distribution pattern of immigrating rice planthoppers in Nagasaki Prefecture.

1990 ◽  
Vol 36 ◽  
pp. 85-89
Author(s):  
Kiyotoshi YOKOMIZO ◽  
Nobuyuki NANBA ◽  
Yoshio OGAWA
Keyword(s):  
Distribution Pattern ◽  
Local Distribution ◽  
Rice Planthoppers ◽  
Nagasaki Prefecture

scholarly journals Pollination and floral biology of Adonis vernalis L. (Ranunculaceae) – a case study of threatened species

2014 ◽  
Vol 83 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Bożena Denisow ◽  
Małgorzata Wrzesień ◽  
Anna Cwener
Keyword(s):  
Threatened Species ◽  
Breeding System ◽  
Pollen Viability ◽  
Management Strategies ◽  
Reproductive Potential ◽  
Floral Biology ◽  
Pollination Syndrome ◽  
Compact Range ◽  
Pollen Vectors ◽  
Pollination Systems

<p>Although the knowledge of pollination systems of rare and threatened species is one of the principles for development of optimal conservation and management strategies, the data about their pollination requirements are scarce or incomplete. Different problems are listed (xerothermic habitat disappearance, overgrowing of patches, plant biology i.e., slow plant growth, problems with seed germination) among the possible causes of <em>Adonis vernalis</em> being threatened, but until now no consideration was given to the flowering biology and pollination.</p><p>The observations of flowering biology of <em>A. vernalis</em> (Ranunculaceae), a clonal species, were conducted in an out-of-compact-range population, in the Lublin Upland, Poland (51°18<em>'</em>55<em>"</em> N, 22°38<em>'</em>21<em>"</em> E), in 2011–2013. The reproductive potential of <em>A. vernalis</em> is related to the population age structure, pollination syndrome, and breeding system. The flowers exhibit incomplete protogyny. The dichogamy function is supported by different (biological, morphological) mechanisms. Stigma receptivity occurred about one day before anthers started shedding self-pollen, and pollen viability was increasing gradually during the flower life-span (66.3% in distal anthers vs. 77.3% in proximal). The decrease in pollen production and in pollen viability coincided with the lowest degree of seed set, irrespective of the pollination treatment. Pollen vectors are necessary for efficient pollination, as the proportion of pistils setting fruits after open pollination (41–82.1%) was significantly higher compared to spontaneous self-pollination (only 5.5–12.3%). The pollination requirements together with pollen/ovule ratio (P/O = 501) indicate a facultative xenogamous breeding system in <em>A. vernalis</em>. Therefore, in the conditions of the global lack of pollinators, improper pollination may weaken the population by leading to a decrease in the proportion of recombinants, and in addition to other factors, may accelerate extinction of small <em>A. vernalis</em> populations.</p>

scholarly journals Reproductive effort as an element of life strategy of Lythrum salicaria L. populations

2012 ◽  
Vol 60 (2) ◽  
pp. 105-110
Author(s):  
Bożenna Czarnecka ◽  
Magdalena Franczak ◽  
Katarzyna Nowak
Keyword(s):  
Biomass Allocation ◽  
Reproductive Strategies ◽  
Reproductive Effort ◽  
Population Level ◽  
Lythrum Salicaria ◽  
Purple Loosestrife ◽  
Life Strategy ◽  
Life Strategies ◽  
Habitat Conditions ◽  
Different Populations

The aim of the study was to compare some life strategy traits of individuals of Purple Loosestrife <i>Lythrum salicaria</i> within three meadow populations existing under various habitat conditions. The study attempted to answer the following questions: Do different habitat conditions affect the biomass allocation between particular organs of individuals? Can the individuals belonging to different populations of the same species realise their own unique reproductive strategy, in other words, can their reproductive effort represent various levels? In the case of <i>L. salicaria</i> the reproductive effort, measured by the participation of infl orescence biomass in the biomass of aboveground parts of genets, exhibits similar values (14.2-15.1%) in all the study populations, despite their habitat conditions. This fact proves that at the population level, the reproductive effort is relatively stable. Great differences are visible in the case of particular individuals within each of the populations. Specific genets in a population, depending on the habitat microstructure and the biotic relations with other individuals both of their own and other species, may realise their own reproductive strategies, being a part of their life strategies.

Snow algae of the Windmill Islands, continental Antarctica. Mesotaenium berggrenii (Zygnematales, Chlorophyta) the alga of grey snow

1990 ◽  
Vol 2 (2) ◽  
pp. 143-148 ◽  
Author(s):  
H.U. Ling ◽  
R.D. Seppelt
Keyword(s):  
Life Cycle ◽  
Nuclear Size ◽  
Survival Strategies ◽  
Algal Flora ◽  
Local Distribution ◽  
Habitat Conditions ◽  
Size Classes ◽  
Snow Algae ◽  
Continental Antarctica ◽  
Windmill Islands

A saccoderm desmid Mesotaenium berggrenii forma (Mesotaeniaceae) occurring as a major component of the snow algal flora is reported from the Windmill Islands region of Continental Antarctica. Stages of the life cycle of the species are illustrated. The local distribution of the species is outlined, habitat conditions described, taxonomy, reproduction and survival strategies discussed. Morphological and nuclear size classes indicate the possibility of polyploidy in the species.

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