Influence of restoration age on egg bank richness and composition: an ex situ experiment

2020 ◽  
Vol 42 (5) ◽  
pp. 553-563
Author(s):  
Carla Olmo ◽  
MarÍa Antón-Pardo ◽  
Raquel Ortells ◽  
Xavier Armengol
Keyword(s):  
Zooplankton Community ◽  
Temporary Ponds ◽  
Ex Situ ◽  
Egg Bank ◽  
Hatching Time ◽  
Restoration Practices ◽  
Restoration Age ◽  
Abundance And Diversity ◽  
Different Characteristics ◽  
Full Reflection

Abstract Zooplankton community assembly after flooding in temporary ponds depends mostly on abundance and diversity of the dormant propagule bank. However, our understanding of the hatching patterns of zooplankton is imperfect. We performed an ex situ experiment to study the species composition and temporal sequence of zooplankton emergence from sediments in three ponds that were restored at different times: 1998, 2003 and 2007. The patterns of species hatching observed in our microcosms were compared with the emergent zooplankton community of their equivalent, synchronically inundated ponds. An escalation in species richness and a delay in hatching time were detected with increasing restoration age. In addition, some discrepancies between the egg bank and active populations were observed, especially in the oldest pond. This study illustrates the use of hatching experiments in comparing ponds with different characteristics. Nevertheless, egg bank hatching and water column sampling should complement each other in order to afford a full reflection of past diversity and contribute to a better understanding of the efficiency of restoration practices.

scholarly journals The Case Study of the Medieval Town Walls of Gubbio in Italy: First Results on the Characterization of Mortars and Binders

Heritage ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 468-478 ◽  
Author(s):  
Fernanda Carvalho ◽  
Andreia Lopes ◽  
Antonella Curulli ◽  
Teresa da Silva ◽  
Maria Lima ◽  
...  
Keyword(s):  
Polarized Light ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heritage Sites ◽  
First Results ◽  
Restoration Practices ◽  
Climate Events

Good conservation and restoration practices of cultural heritage assets rely on the knowledge of original materials. In the framework of the HERACLES Project (HERACLES—HEritage Resilience Against CLimate Events on Site, H2020 Grant Agreement 700395), dealing with the effects of climatic actions and natural hazards on built heritage, a set of important heritage sites are currently under study to improve their resilience against climate events. Among these are the medieval Gubbio Town Walls in Italy. The present work focuses on the mortars and binders of this monument and collected samples related to different parts of the Walls, corresponding to various historical periods of construction and interventions. They were characterized to determine their minerochemical composition, thermal behavior, and morphology. For that purpose, ex-situ laboratory techniques, such as X-ray diffraction (XRD), wavelength dispersive X-ray fluorescence (WDXRF), optical microscopy (OM), polarized light microscopy (PLM), scanning electron microscopy (SEM), and simultaneous differential thermal analysis and thermogravimetry (TG-DTA) were used to discern trends in different sampling areas due to construction/reconstruction periods and building techniques.

Assessing rotifer diapausing egg bank diversity and abundance in brackish temporary environments: an ex situ sediment incubation approach

2008 ◽  
Vol 173 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Eduardo M. García-Roger ◽  
Xavier Armengol-Díaz ◽  
María José Carmona ◽  
Manuel Serra
Keyword(s):  
Ex Situ ◽  
Egg Bank

scholarly journals Zooplankton community structure from tropical temporary ponds during a flood period

Limnetica ◽  
2019 ◽  
Vol 38 (1) ◽  
pp. 189-211
Author(s):  
Karime de Araujo Paina ◽  
Maria da Graça Gama Melão
Keyword(s):  
Community Structure ◽  
Zooplankton Community ◽  
Temporary Ponds ◽  
Zooplankton Community Structure ◽  
Flood Period

Long-term dynamics of the zooplankton community during large salinity fluctuations in a coastal lagoon

2015 ◽  
Vol 66 (4) ◽  
pp. 352 ◽  
Author(s):  
Luciana Rabelo Araújo ◽  
Paloma Marinho Lopes ◽  
Jayme Magalhães Santangelo ◽  
Francisco de Assis Esteves ◽  
Reinaldo Luiz Bozelli
Keyword(s):  
Species Richness ◽  
Total Phosphorus ◽  
Coastal Lagoon ◽  
Zooplankton Community ◽  
Zooplankton Community Structure ◽  
Egg Bank ◽  
Resting Egg ◽  
Low Salinity ◽  
Resting Egg Bank

Aquatic coastal systems are affected by high fluctuations in salinity and the zooplankton may rely on dispersal or dormancy to recolonise these environments. Here, we analysed the long-term dynamics of the zooplankton community over 6 years during large salinity fluctuations in a coastal lagoon (Garças Lagoon, Brazil) and the effect of salinity on the hatching patterns of the resting egg bank. We hypothesised that salinity is the main driving factor of the zooplankton community structure, and that increases in salinity reduce the species richness and the abundance of hatchlings. Multiple regression analysis showed that salinity was associated negatively with species richness in the open water, whereas total phosphorus and chlorophyll-a concentrations were negatively and positively related to abundance respectively. Redundancy analysis demonstrated that temporally structured environmental variables (total phosphorus and salinity) were important for zooplankton composition. Periods of low salinity allowed the presence of freshwater organisms, changing the zooplankton composition over the years. However, our hatchling experiment showed a depauperate resting egg bank. Overall, our results showed a strong influence of salinity on the structure and dynamics of the zooplankton at Garças Lagoon, and that the resting egg bank likely plays a minor role in the zooplankton colonisation during low-salinity periods.

scholarly journals Seaweed Species Composition, Abundance and Diversity in Drini and Kondang Merak Beach, Java

2018 ◽  
Vol 47 ◽  
pp. 03006
Author(s):  
Taufiq Ahmad Romdoni ◽  
Ajeng Ristiani ◽  
Maria Dyah Nur Meinita ◽  
Bintang Marhaeni ◽  
Setijanto
Keyword(s):  
Species Composition ◽  
Diversity Index ◽  
Sampling Technique ◽  
Survey Method ◽  
Enteromorpha Flexuosa ◽  
Transect Sampling ◽  
Abundance And Diversity ◽  
Different Characteristics ◽  
Physical And Chemical ◽  
Beach Survey

The different characteristics of subtrate might give influence on species composition, abundance and diversity of seaweed. Kondang Merak and Drini Beach are two beaches in Java Island which have different subtrate characteristic. The aim of this study is to investigate seaweed composition, abundance and diversity in Drini Beach and Kondang Merak Beach. Survey method and quadrant transect sampling technique were applied in this study. The result showed that 13 species of seaweed were found at Drini Beach and 18 species of seaweed were found in Kondang Merak Beach. The composition of the seaweed at Drini Beach and Kondang Merak Beach were dominated by Rhodophyta (69% and 56%). Enteromorpha flexuosa was the most abundant seaweed at Drini Beach, while at Kondang Merak Beach was dominated by Chaetomorpha crassa. The seaweed diversity index of Kondang Merak Beach (2,08) was higher than Drini Beach (1,27). Physical and chemical parameters were categorized as the optimal for the growth of the seaweed.

Abundance, composition and spatial variation in the egg bank of a tropical zooplankton community

2011 ◽  
Vol 46 (3) ◽  
pp. 225-232 ◽  
Author(s):  
Jayme M. Santangelo ◽  
Francisco de A. Esteves ◽  
Marina Manca ◽  
Reinaldo L. Bozelli
Keyword(s):  
Spatial Variation ◽  
Zooplankton Community ◽  
Tropical Zooplankton ◽  
Egg Bank

scholarly journals Orchid diversity in antropogenic-induced degraded tropical rainforest, an extrapolation towards conservation

Lankesteriana ◽  
2019 ◽  
Author(s):  
Edward E. Besi ◽  
Dome Nikong ◽  
Muskhazli Mustafa ◽  
Rusea Go
Keyword(s):  
Peninsular Malaysia ◽  
Ex Situ ◽  
Soil Conditions ◽  
Ground Vegetation ◽  
Secondary Forests ◽  
Clear Cut ◽  
Disturbed Areas ◽  
Terrestrial Orchids ◽  
Logged Forest ◽  
Abundance And Diversity

The uncontrolled logging in Peninsular Malaysia and the resulting mudslides in the lowland areas have been perilous, not to just humans, but also to another biodiversity, including the wild orchids. Their survival in these highly depleted areas is being overlooked due to the inaccessible and harsh environment. This paper reports on the rescue of orchids at risk from the disturbed forests for ex-situ conservation, the identification of the diversity of orchids and the evaluation of the influence of micro-climatic changes induced by clear-cut logging towards the resilience of orchids in the flood-disturbed secondary forests and logged forests in Terengganu and Kelantan, located at the central region of Peninsular Malaysia, where the forest destruction by logging activities has been extensive. 109 orchid species belonging to 40 genera were collected from the disturbed areas. The diversity and data analyses show that the disturbed secondary forests had a higher orchid density (0.0133 plants/m2) than the logged sites (0.0040 plants/m2) as the habitat conditions were more dependable. Nevertheless, the logged forests harboured a higher diversity of orchids (H=4.50 and D=0.99) of which 97.9% were epiphytes. Eleven rare species were found along with six species endemic to Peninsular Malaysia, with two species new to science. The results highlighted the factors that allow the orchids to flourish or suffer in the disturbed forests. The logged forests had a higher ambient temperature and lower moisture level than the mud flood-disturbed and canopy-covered secondary forests. Apart from the extensive ground vegetation due to logs dragging extraction, low soil moisture and absence of leaf litter were believed to be the major attributes causing the low abundance of terrestrial orchids. The high abundance and diversity of epiphytic orchids and the large difference of their densities between the logged sites were influenced by the densities of fallen trees hosting orchid(s), disturbance-induced dryness stresses, durations of exposure to the anthropogenic-induced disturbance, and less favourable soil conditions for the terrestrial orchids.   Key words: conservation, diversity, dryness stress, ecology, epiphyte, logged forest, mudslides, Orchidaceae

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