scholarly journals Response of a globally endangered canopy insectivore to habitat degradation in an East African tropical rainforest: The role of differential forest protection levels

2014 ◽  
Vol 6 (3) ◽  
pp. 290-300
Author(s):  
Erick Otieno Nickson ◽  
Sajita Nixon ◽  
Shitandayi Dennis
Keyword(s):  
Tropical Rainforest ◽  
Habitat Degradation ◽  
East African ◽  
Forest Protection

scholarly journals Defining the niche for niche construction: evolutionary and ecological niches

2021 ◽  
Vol 36 (3) ◽  
Author(s):  
Rose Trappes
Keyword(s):  
Evolutionary Biology ◽  
Ecological Niche ◽  
Niche Construction ◽  
Habitat Degradation ◽  
Ecological Niches ◽  
Niche Concept ◽  
Definition Of ◽  
Compare And Contrast ◽  
Extreme Habitat

AbstractNiche construction theory (NCT) aims to transform and unite evolutionary biology and ecology. Much of the debate about NCT has focused on construction. Less attention has been accorded to the niche: what is it, exactly, that organisms are constructing? In this paper I compare and contrast the definition of the niche used in NCT with ecological niche definitions. NCT’s concept of the evolutionary niche is defined as the sum of selection pressures affecting a population. So defined, the evolutionary niche is narrower than the ecological niche. Moreover, when contrasted with a more restricted ecological niche concept, it has a slightly different extension. I point out three kinds of cases in which the evolutionary niche does not coincide with realized ecological niches: extreme habitat degradation, commensalism, and non-limiting or super-abundant resources. These conceptual differences affect the role of NCT in unifying ecology and evolutionary biology.

scholarly journals Are tropical reptiles really declining? A six-year survey of snakes in Drake Bay, Costa Rica, and the role of temperature, rain and light

2019 ◽  
Author(s):  
Jose Pablo Barquero-González ◽  
Tracie L. Stice ◽  
Gianfranco Gómez ◽  
Julián Monge-Nájera
Keyword(s):  
Costa Rica ◽  
Environmental Factors ◽  
Sea Level ◽  
Tropical Rainforest ◽  
Transect Counts ◽  
Diet Type

AbstractIntroductionstudies in the last two decades have found declining snake populations in both temperate and tropical sites, including informal reports from Drake Bay, Costa Rica.Objectiveto investigate if reports of decreasing snake populations in Drake Bay had a real basis, and if environmental factors, particularly temperature, rain and light, have played a role in that decrease.Methodswe worked at Drake Bay from 2012 through 2017 and made over 4000 h of transect counts. Using head flashlights we surveyed a transect covered by lowland tropical rainforest at an altitude of 12–38 m above sea level, near the Agujas River, mostly at 1930–2200 hours. We counted all the snakes that we could see along the transect.Resultssnake counts increase from August to September and then decline rapidly. The May snakes/rainfall peaks coincide, but the second snake peak occurs one month before the rain peak; we counted more snakes in dry nights, with the exception of Imantodes cenchoa which was equally common despite rain conditions. We saw less Leptodeira septentrionalis on bright nights, but all other species were unaffected. Along the six years, the number of species with each diet type remained relatively constant, but the number of individuals declined sharply for those that feed on amphibians and reptiles. We report Rhadinella godmani, a highland species, at 12–38 m of altitude.Conclusionnight field counts of snakes in Drake Bay, Costa Rica, show a strong decline from 2012 through 2017.

scholarly journals Forest Protection Unifies, Silviculture Divides: A Sociological Analysis of Local Stakeholders’ Voices after Coppicing in the Marganai Forest (Sardinia, Italy)

Forests ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 708
Author(s):  
Giampiero Branca ◽  
Irene Piredda ◽  
Roberto Scotti ◽  
Laura Chessa ◽  
Ilenia Murgia ◽  
...  
Keyword(s):  
Rural Communities ◽  
Social Economic ◽  
Multiple Scale ◽  
Social Actor ◽  
Structured Interviews ◽  
Traditional Use ◽  
Forest Protection ◽  
The Social ◽  
Local Stakeholders

Today, a forest is also understood as a real social actor with multiple-scale influences, capable of significantly conditioning the social, economic, and cultural system of a whole territory. The aim of this paper is to reconstruct and interpret the population’s perception of the silvicultural activities related to traditional use of forest resources of the southwestern Sardinian Marganai State Forest. The “Marganai case” has brought to the attention of the mass media the role of this forest and its silviculture. The research was carried out via semi-structured interviews with the main stakeholders in the area. The qualitative approach in the collection and analysis of the information gathered has allowed us to reconstruct the historical-cultural and social cohesion function that the forest plays in rural communities. The results highlight that the main risks concern the erosion of the cultural forest heritage due to the abandonment of the rural dimension (mainly by the new generations, but not only), with the consequent spread of deep distortions in the perception, interpretation, and necessity of forestry activities and policy.

scholarly journals The AC4 Protein of a Cassava Geminivirus Is Required for Virus Infection

2019 ◽  
Vol 32 (7) ◽  
pp. 865-875 ◽  
Author(s):  
Kegui Chen ◽  
Behnam Khatabi ◽  
Vincent N. Fondong
Keyword(s):  
Plant Viruses ◽  
Wild Type Virus ◽  
Virus Infectivity ◽  
Type Virus ◽  
Wild Type ◽  
Knockout Mutant ◽  
East African ◽  
Reading Frame ◽  
Cell Membrane Binding

Geminiviruses (family Geminiviridae) are among the most devastating plant viruses worldwide, causing severe damage in crops of economic and subsistence importance. These viruses have very compact genomes and many of the encoded proteins are multifunctional. Here, we investigated the role of the East African cassava mosaic Cameroon virus (EACMCV) AC4 on virus infectivity in Nicotiana benthamiana. Results showed that plants inoculated with EACMCV containing a knockout mutation in an AC4 open reading frame displayed symptoms 2 to 3 days later than plants inoculated with wild-type virus, and these plants recovered from infection, whereas plants inoculated with the wild-type virus did not. Curiously, when an additional mutation was made in the knockout mutant, the resulting double mutant virus completely failed to cause any apparent symptoms. Interestingly, the role of AC4 on virus infectivity appeared to be dependent on an encoded N-myristoylation motif that mediates cell membrane binding. We previously showed that EACMCV containing the AC4T38I mutant produced virus progeny characterized by second-site mutations and reversion to wild-type virus. These results were confirmed in this study using additional mutations. Together, these results show involvement of EACMCV AC4 in virus infectivity; they also suggest a role for the combined action of mutation and selection, under prevailing environmental conditions, on begomovirus genetic variation and diversity.

scholarly journals Determinants of People’s Participation in Forest Protection and Management: A Study in Kaski, Nepal

2016 ◽  
pp. 175-186 ◽  
Author(s):  
Yogesh Ranjit
Keyword(s):  
Environmental Protection ◽  
Forest Products ◽  
Economic Benefits ◽  
Forest Protection ◽  
The People ◽  
The Government ◽  
Indigenous Forest ◽  
Forest Plans ◽  
Indigenous Forest Management

Forests are easily available renewable natural resources in the world that directly and indirectly provide socio-economic benefits to the people living in and around the forests and also environmental protection and ecological balance to the global people. In Nepal, traditionally people’s participation in forest protection and sustainable management was very popular through many informal traditional and indigenous forest management committees. But, unfortunately, there was a huge lost of forests in quantity, quality and density due to some unfavorable socio-economic and political situations. So, the government has formally, legally and gradually shifted from centralized to decentralized protection and management of forests since mid of 1970’s through various forest plans, policies, acts, regulation and guidelines. The major aims of people’s participation are to get basic forest products, socio-economic development, and overall improvement of forest resources. Moreover, the role of I/NGOs and other stakeholders should be as partner, advisor, facilitator and more technical supporter for effective participation of people. However, the major challenges of people’s participation is how to make meaningful involvement of local people in better forest protection, management and sustainable development so that they will get sustainable economic benefits for livelihood, environmental protection and ecological balance.Economic Journal of Development Issues Vol. 17 & 18 No. 1-2 (2014) Combined Issue; Page: 175-186

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