Relationship between turbidity and the benthic community in the preserved Montebello Lakes in Chiapas, Mexico

2020 ◽  
Vol 71 (7) ◽  
pp. 824
Author(s):  
Inari Sosa-Aranda ◽  
Luis Zambrano
Keyword(s):  
Cluster Analysis ◽  
Species Richness ◽  
National Park ◽  
Benthic Communities ◽  
Benthic Macroinvertebrate ◽  
Gradual Change ◽  
Secchi Disc ◽  
Secchi Disc Depth ◽  
Dry Seasons ◽  
Species Richness And Abundance

One of the consequences of increased turbidity in lakes is the modification of the structure of the benthic macroinvertebrate community. To understand this relationship, we evaluated 13 lakes in the Montebello Lakes National Park in Chiapas. The lakes have been affected by gradual eutrophication over decades, producing variable transparency values among lakes. Macroinvertebrates were sampled from each lake in the rainy and dry seasons, and species richness and abundance were calculated and related to Secchi disc transparency. Cluster analysis showed that community composition was similar in pristine and semitransparent lakes, in contrast with turbid lakes. Considering macroinvertebrate groups, hyalellids were dominant in pristine and semiturbid lakes, whereas chironomids were dominant in turbid lakes. A significant quadratic relationship between richness and Secchi disc depth values was found, which is consistent with the intermediate production hypothesis. This study shows how a gradual change in Secchi disc depth can markedly modify benthic communities.

Species richness and abundance of ectomycorrhizal basidiomycete sporocarps on a moisture gradient in the Tsuga heterophylla zone

2000 ◽  
Vol 77 (12) ◽  
pp. 1699-1711 ◽  
Author(s):  
Thomas E O'Dell ◽  
Joseph F Ammirati ◽  
Edward G Schreiner
Keyword(s):  
Species Richness ◽  
Ectomycorrhizal Fungi ◽  
Standing Crop ◽  
National Park ◽  
Environmental Gradient ◽  
Total Sample ◽  
Fungal Species ◽  
Tsuga Heterophylla ◽  
Olympic National Park ◽  
Species Richness And Abundance

Sporocarps of epigeous ectomycorrhizal fungi and vegetation data were collected from eight Tsuga heterophylla (Raf.) Sarg. - Pseudotsuga menziesii (Mirb.) Franco stands along a wet to dry gradient in Olympic National Park, Washington, U.S.A. One hundred and fifty species of ectomycorrhizal fungi were collected from a total sample area of 2.08 ha. Over 2 years, fungal species richness ranged from 19 to 67 taxa per stand. Sporocarp standing crop ranged from 0 to 3.8 kg/ha, averaging 0.58 kg/ha, 0.06 kg/ha in spring and 0.97 kg/ha in fall. Sporocarp standing crop and fungal species richness were correlated with precipitation. These results demonstrated that ectomycorrhizal fungal sporocarp abundance and species richness can be partly explained in terms of an environmental gradient.

scholarly journals Patterns of Species Richness and Abundance in Badingilo National Park in South Sudan

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Thomas Francis Lado ◽  
David Gwolo Phanuel Mogga ◽  
Richard Angelo Lado Benjamin
Keyword(s):  
Species Richness ◽  
National Park ◽  
Habitat Type ◽  
Bird Species ◽  
Abundant Species ◽  
Point Count ◽  
Number Of Species ◽  
Riverine Habitat ◽  
Species Richness And Abundance ◽  
Point Count Method

The study was carried out to determine patterns of birds’ species richness, alpha and beta diversities; and abundance in Badingilo national park using a 10 m fixed-radius point count method. A total of 2670 individuals were recorded from 182 points in the park. The highest expected number of species (Jack1 estimator) was observed in the Riverine habitat and least was in the Agriculture and Human settlement habitat type. The total number of species observed in the park was 63; however Jack1 estimator indicated that there were 68 species in the park. The majority of the birds observed during the study were resident species, few migratory and Palaearctic bird species. Few birds observed in the park were abundant. The most abundant species was the village weaver (381 individuals), and the rarest species were black-bellied bustard, barn owl, black scimitar bill and tree pipit (one individual each).

scholarly journals Preliminary data on the Posidonia meadows and associated macrozoobenthic community of Sazani island (Albania)

2015 ◽  
Author(s):  
Jula Selmani ◽  
Stela Ruci ◽  
Denada Kasemi ◽  
Sajmir Beqiraj ◽  
Lefter Kashta
Keyword(s):  
Species Richness ◽  
Marine Protected Area ◽  
Rapid Assessment ◽  
Posidonia Oceanica ◽  
The State ◽  
Macroinvertebrate Community ◽  
Eastern Coast ◽  
Benthic Macroinvertebrate ◽  
Species Number ◽  
Species Richness And Abundance

The seagrass Posidonia oceanica meadows are scarcely studied in the Albanian coast. Data presented in this work have been collected during an assessment of benthic communities of Sazani Island, Albania, in May 2013. The P. oceanica meadow has a limited distribution around this island, covering a relatively small area on its eastern coast. Although this meadow seems to be under degradation, it is still a good shelter for high species number and high abundance of benthic macroinvertebrates. The highest species richness and abundance has been recorded for sponges, hydrozoans, gastropods, bivalves, polychaetes, echinoderms, bryozoans and ascidians. The sciaphilic and photophilic communities were clearly evident, associated respectively to the P. oceanica rhizomes and leaves. Referring to the species richness and abundance, a rapid assessment of ecological and environmental state of benthic macroinvertebrate community has been done. Other parameters used for the assessment of the state of P. oceanica meadow have also been recorded, and possible reasons for the degradation of the meadow have been highlighted. These assessments of the benthic macroinvertebrate community and the state of seagrass meadow are also important within the framework of monitoring, conservation and management of the only Marine Protected Area of Albania, where Sazani Island is a core area.

The genus Cola (Malvaceae) in Cameroon’s Korup National Park, with two novelties

2018 ◽  
Vol 151 (2) ◽  
pp. 241-251 ◽  
Author(s):  
David Kenfack ◽  
Moses N. Sainge ◽  
George B. Chuyong ◽  
Duncan W. Thomas
Keyword(s):  
Species Richness ◽  
New Species ◽  
National Park ◽  
Conservation Status ◽  
Morphological Identification ◽  
Comparable Data ◽  
Korup National Park ◽  
Distribution Ranges ◽  
Two New Species ◽  
Species Richness And Abundance

Background and aims – Cola, the second largest genus of the Malvaceae-Sterculioideae comprises 100–135 small to large tree species confined in nature to African forests, though cultivated elsewhere. Current species distribution ranges show that the genus is highly diverse in the seasonally wet forests along the Nigeria-Cameroon border, including the Korup National Park (KNP). In this paper we examine the diversity and abundance of Cola in KNP compared to other forests for which comparable data are available. We also describe two novelties in the genus.Methods – We used inventory data from a 50-ha permanent plot in southern KNP where all Cola trees and saplings down to 1 cm in diameter were tagged, mapped and identified. Additional collections of the genus came from the 11 km trail leading to the plot. Classic herbarium techniques and field observations were used for the morphological identification and description of specimens at MO and YA and from our personal collections. Cola species richness and abundance was estimated from the plot data and compared to other African forest sites for which comparable data are available. The evaluation of the conservation status of the two new species described in this paper followed the IUCN Red List Categories and Criteria. Key results – Twenty-five species of Cola were identified in the southern part of the KNP, including four undescribed species, raising the total number of Cola species in Cameroon to 46. The abundance of the genus in KNP was three orders of magnitude higher than in the Rabi forest in southwestern Gabon or in the Ituri forest in eastern D.R. Congo. This high species richness and abundance suggests that KNP is part of the center of diversity of the genus. Two new species, Cola zemagoana Kenfack & D.W.Thomas and C. mamboana Kenfack & Sainge are described and illustrated. Both species are only known from the lowland rainforest of southwestern Cameroon. Cola zemagoana is narrow endemic of southern KNP and its conservation status is assessed as Endangered. Cola mamboana is confined to the lowland forests of southwestern Cameroon, is locally very abundant in protected areas and is also assigned the conservation status Endangered.

scholarly journals Impact of Mikania micrantha H.B.K. Invasion on Diversity and Abundance of Plant Species of Chitwan National Park, Nepal

2015 ◽  
Vol 19 (2) ◽  
pp. 30-36 ◽  
Author(s):  
Binoj Kumar Shrestha ◽  
Dharma Raj Dangol
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
National Park ◽  
Sampling Technique ◽  
Plant Species Richness ◽  
Alien Plant ◽  
Mikania Micrantha ◽  
Crown Cover ◽  
Chitwan National Park ◽  
Species Richness And Abundance

This research investigated the invasion of the alien plant Mikania micrantha H.B.K. and its impact on plant species richness and abundance in Chitwan National Park (CNP) forest. Stratified sampling technique was used to collect the information using the nested quadrats in the Mikania invaded and not invaded sites in July 2011. The study revealed that the invasion highly related with the vegetation structure of the habitat; higher the tree crown cover lower the invasion. On the other hand, the invasion in terms of cover percent of Mikania irrespective of the biomass (fresh weight) decreased plant species richness. Species richness showed unimodal response to the Mikania cover percent with the decrease after 35% of Mikania cover. Journal of Institute of Science and Technology, 2014, 19(2): 30-36

scholarly journals KELIMPAHAN CHRYSOPHYTA PADA MEDIA BUDIDAYA IKAN NILA YANG DIBERI PAKAN FERMENTASI DENGAN PENAMBAHAN TEPUNG KULIT UBI KAYU DAN PROBIOTIK

2014 ◽  
Vol 1 (1) ◽  
pp. 68
Author(s):  
Retno Ambarwati ◽  
Endang Widyastuti ◽  
Dwi Sunu Widyartini
Keyword(s):  
Cluster Analysis ◽  
Species Richness ◽  
Culture Media ◽  
Similarity Index ◽  
Dissimilarity Index ◽  
Fermented Feed ◽  
Golden Yellow ◽  
Phosphate Species ◽  
Species Richness And Abundance ◽  
Cassava Peel

Chrysophyta is also known as golden-yellow algae because of the yellow dominant pigment of carotene and xanthophyll. This study aimed to determine species richness and abundance of Chrysophyta in the Tilapia culture media which was fed with the addition of cassava peel flour and probiotic. The method applied in this study was the experimental method with 4 treatments, i.e.: the use of fermented feed with the addition of cassava peel flour (0%, 25%, 50%, and 75%) and probiotic in Tilapia culture media. Each treatment was replicated 4 times. Sampling was carried out 6 times at intervals of 2 weeks. The observed parameters were the main parameters, i.e.: the number of Chrysophyta species and individuals; and supporting parameters, i.e.: water temperature, pH, TDS, TSS, NO3, NO2, BOD5, DO, and total of phosphate. Species richness and abundance of Chrysophyta data were analyzed using cluster analysis based on Bray-Curtis similarity coefficient. The analysis continued with Similarity Percentages (SIMPER) analysis to determine the contribution of species to the similarity index in each group or to dissimilarity index amongst groups. The results showed that the species richness found in the Tilapia media culture which was fed with the addition of cassava peel flour and probiotic consist of 20 species belonging to a class namely Bacillariophyceae. Abundance of Chrysophyta obtained was ranged from 5.160-13.292 individuals/liter. The cluster analysis showed that Chrysophyta amongst treatments have a quite high similarity level (> 50%) was ranged between 65.56% -83.99%. Contributions of species which contribute the highest similarity index were Diatoma vulgare (49.80%), Navicula brachysira (70.50%) and Navicula platystoma (82%).

Species Richness and Diversity in Bee Assemblages in a Fragment of Savanna (Cerrado) at Northeastern Brazil

Sociobiology ◽  
2018 ◽  
Vol 65 (4) ◽  
pp. 566 ◽  
Author(s):  
Cândida Maria Lima Aguiar ◽  
Edson Braz Santana ◽  
Celso Feitosa Martins ◽  
Felipe Vivallo ◽  
Cláudia Oliveira Santos ◽  
...  
Keyword(s):  
Species Richness ◽  
National Park ◽  
Sampling Time ◽  
Northeastern Brazil ◽  
Sampling Effort ◽  
Species Loss ◽  
Chapada Diamantina ◽  
Factors Affecting ◽  
Ordination Analysis ◽  
Species Richness And Abundance

The conservation of the fauna of bees inhabiting the Brazilian savanna is threatened due to changes in land use in the last decades. We investigated the composition, species richness and abundance of a bee assemblage in the vicinity of the Chapada Diamantina National Park. In addition, we compiled data on composition and diversity from another bee assemblage located in the same portion of the Cerrado, which was previously investigated by one of us almost 30 years ago, in order to produce a more complete panorama on beta diversity of bees in this region. We used a non-metric multidimensional scaling ordination analysis (NMDS) to compare composition of bee assemblages from diff erent types of open vegetation. We recorded 77 bee species (H’ = 2.95; J = 0.68), 42% of them were singletons. We collected slightly more than half of the species and 60% of the genera recorded in the bee assemblage studied three decades ago. H’ was signifi cantly lower in our area than in the previous study (t = 8.588, p <0.001), but equitability (J) was very similar. Several factors may contribute to these diff erences, including local diff erences in bee assemblage composition, diff erences in the probability of capturing the diff erent species (many rare species), factors affecting the sampling itself, and perhaps species loss over the three decades separating the two studies. The magnitude of species loss is difficult to assess because the two studies were not carried out exactly in the same area and there were differences in sampling time and sampling effort.

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