scholarly journals Throwing the baby out with the bathwater: does laurel forest restoration remove a critical winter food supply for the critically endangered Azores bullfinch?

2010 ◽  
Vol 13 (1) ◽  
pp. 93-104 ◽  
Author(s):  
Ricardo S. Ceia ◽  
Hugo L. Sampaio ◽  
Sandra H. Parejo ◽  
Ruben H. Heleno ◽  
Maria L. Arosa ◽  
...  
The Auk ◽  
1936 ◽  
Vol 53 (3) ◽  
pp. 337-338
Keyword(s):  

1969 ◽  
Vol 47 (4) ◽  
pp. 471-481 ◽  
Author(s):  
Michael Aleksiuk ◽  
Ian McTaggart Cowan

The beaver (Castor canadensis Kuhl) is subjected to a seasonally fluctuating energy regime in the northern portion of its distribution. During the summer the animal has free access to an abundant food supply in the form of growing plant material, while the winter food supply is limited to a store of cached saplings. The summer and winter periods are 4 and 8 months long respectively.In the Mackenzie Delta. Northwest Territories, growth was found to be rapid in the summer and absent in the winter, A winter weight loss characterized immature animals. Fat was deposited in the autumn, maintained during the winter, and mobilized in the spring. Animals were lean during the summer. Thyroid gland weights were high in the summer and low in the winter. It was concluded from these data that metabolic energy expenditure is high during the summer and low during the winter. This annual pattern is an inherent property of northern beavers. The adaptive significance of the pattern. is believed to be that energy expenditure is attuned to environmental energy availability.


Ecology ◽  
2003 ◽  
Vol 84 (8) ◽  
pp. 2108-2118 ◽  
Author(s):  
Otso Huitu ◽  
Minna Koivula ◽  
Erkki Korpimäki ◽  
Tero Klemola ◽  
Kai Norrdahl
Keyword(s):  

2021 ◽  
Vol 9 ◽  
Author(s):  
Pedro F. Develey ◽  
Benjamin T. Phalan

Bird species extinctions in the Atlantic Forest of Brazil have been predicted since the early 1990s, but it has become accepted wisdom that none have yet been documented. We revisit this question in light of updates to the global Red List, and conclude that between five and seven bird species have likely been driven to extinction in the wild in this biome in recent decades, plus a further two species that occurred elsewhere in Brazil. These extinctions were the result of habitat loss in combination with other threats. A further nine Atlantic Forest bird species are Critically Endangered, plus six from elsewhere in Brazil. We review growing efforts to help these species avoid extinction using a range of tools including multi-stakeholder planning, advocacy, habitat protection and restoration on public and private land, focussed research, and intensive population management, drawing on examples from the most threatened Atlantic Forest endemics. Conservation organisations, local communities, government agencies, zoos, international funders, universities and others are working together to prevent these species from disappearing. While the political environment in Brazil has rarely been more hostile to conservation, there are also some positive trends. Rates of deforestation in the Atlantic Forest have fallen, forest restoration and recovery is increasing, and an unprecedented number of ordinary people are taking an interest in birds and participating in citizen science. With dedication, collaboration, sufficient resources, and a focus on evidence-informed solutions, we are hopeful that many of the Critically Endangered species can be pulled back from the brink of extinction.


2011 ◽  
Vol 21 (4) ◽  
pp. 477-489 ◽  
Author(s):  
RICARDO S. CEIA ◽  
JAIME A. RAMOS ◽  
RUBEN H. HELENO ◽  
GEOFF M. HILTON ◽  
TIAGO A. MARQUES

SummaryThe Azores Bullfinch is endemic to the island of São Miguel (Azores, Portugal). Its status was uplisted to Critically Endangered in 2005 on the basis of an extremely small and declining population that was considered to be restricted to a very small mountain range (43 km2), in a single location, within which the spread of invasive plants constituted a threat to habitat quality. Nevertheless, information was mostly inferred, or the product of, non-systematic studies. In order to carry out a complete assessment of the conservation status we analysed: (i) population trend, calculated from annual monitoring 1991–2008, (ii) population size, and (iii) range size, obtaining estimates in a single morning study in 2008 involving the simultaneous participation of 48 observers. Contrary to previous inferences, the population is no longer decreasing, although quality of laurel forest habitat continues to decline due to the persistent threat of invasive species. Population size (mean ± SE) was estimated at 1,064 ± 304 individuals using distance sampling methods, although the estimate was very sensitive to the survey method used. Range size estimates (extent of occurrence and area of occupancy) were 144 km2 and 83 km2 respectively. Given the present information, we propose the downlisting of Azores Bullfinch to Endangered on the IUCN Red List.


Author(s):  
Mark Walczynski
Keyword(s):  

This chapter looks at how the new governor of Canada, Marquis de Denonville, summoned military man Henri Tonti to Quebec to discuss plans to attack the problematic Iroquois, who continued to attack French settlements. After returning to Starved Rock, Tonti dispatched agents to the Illinois, Miami, Shawnee, and other local allies telling them to “declare war against the Iroquois” and inviting them to “assemble in good season at the fort.” Later, the French and Indian army led by the governor himself marched into Iroquois territory. This campaign was indecisive. The Iroquois, who were aware that the French and their allies were coming, scattered before their enemies arrived. However, Denonville did burn several Seneca villages and destroyed their crops, cutting the tribe's winter food supply. One notable French success during this campaign, one in which Tonti was a participant, was the capture on Lake Erie of two English flotillas led by several Canadian “renegades” who were en route to Michilimackinac to trade with the Indians in lands claimed by the French. The chapter then considers the death of Sieur de La Salle. It also explores trade at Fort St. Louis.


2021 ◽  
Author(s):  
Aabid Hussain Mir ◽  
Sumira Tyub ◽  
Irfan Rashid ◽  
Imran Khan ◽  
Mehraj Sheikh ◽  
...  

Abstract Background: Within biodiversity hotspots, forest habitats have been disproportionately reduced and conservation efforts are insufficient, making restoration ventures extremely important. However, the impacts of restoration efforts on native threatened understory biodiversity residing in forest gaps and open edges have been seldom investigated. The current study attempts to fill this knowledge gap by investigating the ecology of a critically endangered understory plant namely Gentiana kurroo, across different successional stages of forest plantations including, open grassland (OG), 3-5-year-old plantation (YP), 5-15-year-old plantation (OP) and a mature forest (MF).Results: The highest population of the species was observed in OG, followed by YP, OP and MF. The regeneration was blocked by the plantation as evidenced by a ‘poor’ status in MF and OP, ‘fair’ at the YP and was ‘good’ only at OG. With an increase in canopy openness, the number of regenerating individuals increased, indicating the negative effect of the closed canopy on regeneration. The ordination projections show that the species density responds negatively with the stand basal area of the woody layer, litter depth, and tree density, but responds positively with soil organic carbon, available phosphorus, and reduction in the plantation. Conclusion: The present study suggests that plantations are more likely to benefit when established on degraded land rather than a replacement of the natural ecosystems, though those systems were initially forested or not. The results have significant implications in designing forest restoration programs, particularly on sites with a high diversity of threatened understory species. Thus, we propose that the forest restoration projects should be designed in a way that favours sensitive understory species without compromising the supply of timber and other non-timber forest products.


2019 ◽  
Vol 44 (5) ◽  
pp. 838-849 ◽  
Author(s):  
Catherine E. M. Nano ◽  
Debbie J. Randall ◽  
Alistair J. Stewart ◽  
Chris R. Pavey ◽  
Peter J. McDonald

Ecology ◽  
2003 ◽  
Vol 84 (10) ◽  
pp. 2680-2691 ◽  
Author(s):  
Mario Díaz ◽  
César Luis Alonso

Sign in / Sign up

Export Citation Format

Share Document