scholarly journals Several cavity-nesting birds fight for a single tree hollow in an Atlantic Forest fragment: consequence of increasing nest-site limitation?

2018 ◽  
Vol 26 (1) ◽  
pp. 12-14 ◽  
Author(s):  
Alexander V. Christianini
Keyword(s):  
Atlantic Forest ◽  
Nest Site ◽  
Forest Fragment ◽  
Single Tree ◽  
Cavity Nesting ◽  
Nest Site Limitation ◽  
Tree Hollow

scholarly journals Nest-Site Reuse Patterns for a Cavity-Nesting Bird Community in Interior British Columbia

The Auk ◽  
2002 ◽  
Vol 119 (2) ◽  
pp. 391-402 ◽  
Author(s):  
K. E H. Aitken ◽  
K. L. Wiebe ◽  
K. Martin
Keyword(s):  
British Columbia ◽  
Nest Site ◽  
Bird Community ◽  
Species Variation ◽  
Mammal Species ◽  
Nest Cavity ◽  
Cavity Nesting ◽  
Managed Landscapes ◽  
Nest Site Limitation ◽  
The Relationship

Abstract Most obligate cavity-nesting birds are considered to be nest-site limited, either by time or energy to excavate or to acquire suitable holes for nesting. We examined rates of nest-cavity reuse for a rich community of cavity-nesting birds in mixed forests in interior British Columbia. Using a sample of 402 cavity-reuse cases over five years, we measured cavity reuse for 20 cavity-nesting bird and mammal species (three guilds), and examined the relationship between nest-cavity reuse and features of cavities, nest trees, and forest stands. Eight percent of used cavities were destroyed between years. Reuse rates were 17% for the cavities of weak excavators such as nuthatches and chickadees, 28% for formerly active woodpecker nests, and 48% for cavities previously used by secondary cavity nesting birds, but there was considerable species variation within all guilds. Nest cavities in aspen that were deep with large entrances had the highest reuse. At the forest stand level, cavities in trees close to edges and in sites with more edge habitat had greater reuse. Reused cavities tended to be occupied in sequential years rather than being inactive for a year. With increasing amounts of managed landscapes, availability of suitable cavities for forest nesting vertebrates is decreasing. Reuse of existing cavities might help mitigate the problem of nest-site limitation.

Lack of Nest Site Limitation in a Cavity-Nesting Bird Community

1990 ◽  
Vol 54 (2) ◽  
pp. 239 ◽  
Author(s):  
Jeffrey R. Waters ◽  
Barry R. Noon ◽  
Jared Verner
Keyword(s):  
Nest Site ◽  
Bird Community ◽  
Cavity Nesting ◽  
Nest Site Limitation

Cavity-nesting bees and wasps (Hymenoptera: Aculeata) in a semi-deciduous Atlantic forest fragment immersed in a matrix of agricultural land

2017 ◽  
Vol 21 (4) ◽  
pp. 727-736 ◽  
Author(s):  
Léo Correia da Rocha-Filho ◽  
Laíce Souza Rabelo ◽  
Solange Cristina Augusto ◽  
Carlos Alberto Garófalo
Keyword(s):  
Atlantic Forest ◽  
Agricultural Land ◽  
Forest Fragment ◽  
Cavity Nesting

scholarly journals Small mammal glucocorticoid concentrations vary with forest fragment size, trap type, and mammal taxa in the Interior Atlantic Forest

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sarah A. Boyle ◽  
Noé U. de la Sancha ◽  
Pastor Pérez ◽  
David Kabelik
Keyword(s):  
Atlantic Forest ◽  
Small Mammals ◽  
Acute Stress ◽  
Physiological Stress ◽  
Fragment Size ◽  
Hair Shaft ◽  
Forest Fragments ◽  
Forest Fragment ◽  
Trapping Methods ◽  
Free Ranging

AbstractSpecies that live in degraded habitats often show signs of physiological stress. Glucocorticoid hormones (e.g., corticosterone and cortisol) are often assessed as a proxy of the extent of physiological stress an animal has experienced. Our goal was to quantify glucocorticoids in free-ranging small mammals in fragments of Interior Atlantic Forest. We extracted glucocorticoids from fur samples of 106 small mammals (rodent genera Akodon and Oligoryzomys, and marsupial genera Gracilinanus and Marmosa) from six forest fragments (2–1200 ha) in the Reserva Natural Tapytá, Caazapá Department, Paraguay. To our knowledge, this is the first publication of corticosterone and cortisol levels for three of the four sampled genera (Akodon, Oligoryzomys, and Marmosa) in this forest system. We discovered three notable results. First, as predicted, glucocorticoid levels were higher in individuals living withing small forest fragments. Second, animals captured live using restraint trapping methods (Sherman traps) had higher glucocorticoid levels than those animals captured using kill traps (Victor traps), suggesting that hair glucocorticoid measures can reflect acute stress levels in addition to long-term glucocorticoid incorporation. These acute levels are likely due to urinary steroids diffusing into the hair shaft. This finding raises a concern about the use of certain trapping techniques in association with fur hormone analysis. Finally, as expected, we also detected genus-specific differences in glucocorticoid levels, as well as cortisol/corticosterone ratios.

scholarly journals Feather mites (Acari, Astigmata) associated with birds in an Atlantic Forest fragment in Northeastern Brazil

2015 ◽  
Vol 75 (3) ◽  
pp. 726-735 ◽  
Author(s):  
HM Silva ◽  
FA Hernandes ◽  
M Pichorim
Keyword(s):  
Atlantic Forest ◽  
Bird Species ◽  
Rio Grande ◽  
Neotropical Region ◽  
Species Level ◽  
Northeastern Brazil ◽  
Forest Fragment ◽  
Visual Examination ◽  
Feather Mites ◽  
First Time

AbstractThe present study reports associations between feather mites (Astigmata) and birds in an Atlantic Forest fragment in Rio Grande do Norte state, in Brazil. In the laboratory, mites were collected through visual examination of freshly killed birds. Overall, 172 individuals from 38 bird species were examined, between October 2011 and July 2012. The prevalence of feather mites was 80.8%, corresponding to 139 infested individuals distributed into 30 species and 15 families of hosts. Fifteen feather mite taxa could be identified to the species level, sixteen to the genus level and three to the subfamily level, distributed into the families Analgidae, Proctophyllodidae, Psoroptoididae, Pteronyssidae, Xolalgidae, Trouessartiidae, Falculiferidae and Gabuciniidae. Hitherto unknown associations between feather mites and birds were recorded for eleven taxa identified to the species level, and nine taxa were recorded for the first time in Brazil. The number of new geographic records, as well as the hitherto unknown mite-host associations, supports the high estimates of diversity for feather mites of Brazil and show the need for research to increase knowledge of plumicole mites in the Neotropical region.

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