The effects of habitat fragmentation by forestry and agriculture on the abundance of small mammals in the southern boreal mixedwood forest

1998 ◽  
Vol 76 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Erin M Bayne ◽  
Keith A Hobson
Keyword(s):  
Small Mammals ◽  
Agricultural Land ◽  
Deer Mouse ◽  
Abundant Species ◽  
Agricultural Landscapes ◽  
Tamiasciurus Hudsonicus ◽  
Deer Mice ◽  
Forest Patches ◽  
Significant Difference ◽  
Boreal Mixedwood Forest

To determine the effects of forest fragmentation on the abundance of small mammals, we livetrapped at edges and in the interior of forest patches in contiguous, logged, and agricultural landscapes in the southern boreal mixedwood forest of Saskatchewan. From 1994 to 1996, we captured 1548 small mammals (11 species) during 8172 trap-nights. The abundance of all small mammals combined was lower in forest patches isolated by logging than in contiguous forest or farm woodlots surrounded by agricultural land. This pattern was consistent in all years, despite significant annual fluctuations in numbers of the boreal red-backed vole (Clethrionomys gapperi), one of the most abundant species in our study area. Red squirrels (Tamiasciurus hudsonicus) and northern flying squirrels (Glaucomys sabrinus) were more abundant in farm woodlots. The abundance of deer mice (Peromyscus maniculatus) was significantly lower in forest patches surrounded by clearcuts, and we speculate that they may have used clearcuts more than forest patches. In contrast, the numbers of boreal red-backed voles were similar among landscapes. The only species showing a response to edge was the deer mouse, which was significantly more abundant at edges of farm woodlots than in interiors. We also found no significant difference in abundance of any species between small (10 ha) and large (>>20 ha) farm woodlots. For most species, within-landscape attributes such as edge and patch size seemed to have little effect on their abundance. However, for a variety of reasons, small-mammal numbers seem to vary considerably among forest patches in different landscapes.

scholarly journals Estimating landscape structure effects on pollination for management of agricultural landscapes

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Ehsan Rahimi ◽  
Shahindokht Barghjelveh ◽  
Pinliang Dong
Keyword(s):  
Forest Fragmentation ◽  
Landscape Structure ◽  
Crop Production ◽  
Agricultural Landscape ◽  
Agricultural Land ◽  
Unit Area ◽  
Agricultural Landscapes ◽  
Edge Density ◽  
Forest Patches ◽  
New Forest

Abstract Background The growing human population around the world is creating an increased demand for food. In agricultural landscapes, forests are cleared and turned into agricultural land to produce more food. Increasing the productivity of agricultural land per unit area may prevent extreme forest degradation. Since many agricultural products are dependent on pollinators, it is possible to increase crop production by increasing the pollination rate in the agricultural landscapes. Pollinators are highly dependent on forest patches in agricultural landscapes. Therefore, by creating new forest patches around agricultural fields, we can increase the pollination rate, and thus the crop production. In this regard, estimating the effects of different scenarios of forest fragmentation helps us to find an optimized pattern of forest patches for increasing pollination in an agricultural landscape. Methods To investigate the effect of different forest fragmentation scenarios on pollination, we used simulated agricultural landscapes, including different forest proportions and degrees of fragmentation. Using landscape metrics, we estimated the relationship between pollination and landscape structure for each landscape. Results Our results showed that for increasing pollination, two significant factors should be considered: habitat amount and capacity of small patches to supply pollination. We found that when the capacity of small patches in supplying pollination was low, fragmented patterns of forest patches decreased pollination. With increasing capacity, landscapes with a high degree of forest fragmentation showed the highest levels of pollination. There was an exception for habitat amounts (the proportion of forest patches) less than 0.1 of the entire landscape where increasing edge density, aggregation, and the number of forest patches resulted in increasing pollination in all scenarios. Conclusion This study encourages agriculturists and landscape planners to focus on increasing crop production per unit area by pollinators because it leads to biodiversity conservation and reduces socio-economic costs of land-use changes. We also suggest that to increase pollination in agricultural landscapes by creating new forest patches, special attention should be paid to the capacity of patches in supporting pollinators.

Small-mammal response to group-selection silvicultural systems in Engelmann spruce – subalpine fir forests 14 years postharvest

2009 ◽  
Vol 39 (9) ◽  
pp. 1698-1708 ◽  
Author(s):  
Douglas B. Ransome ◽  
Pontus M.F. Lindgren ◽  
Michaela J. Waterhouse ◽  
Harold M. Armleder ◽  
Thomas P. Sullivan
Keyword(s):  
Small Mammals ◽  
Small Mammal ◽  
Group Selection ◽  
High Elevation ◽  
Deer Mice ◽  
Subalpine Forests ◽  
Subalpine Fir ◽  
Engelmann Spruce ◽  
South Central ◽  
Significant Difference

Concerns about the impacts of clear-cut harvesting on ecosystem components in subalpine forests have generated a variety of alternative silvicultural systems in high-elevation forests in western North America. We examined responses of forest-floor small mammals, 14 years posttreatment, in four replicate units, uncut forest, a 1.0 ha group-selection cut, a large (>30 ha) clearcut, and the edge between the group-selection cut and uncut forest, in the Engelmann Spruce ( Picea engelmannii Parry ex Engelm.) – Subalpine Fir ( Abies lasiocarpa (Hook.) Nutt.) biogeoclimatic zone in south-central British Columbia, Canada. Populations of small mammals were livetrapped during five sessions from June to September 2006. The mean abundance of southern red-backed voles ( Myodes gapperi Vigors) was significantly lower on large clearcuts than in uncut old-growth forests, with intermediate numbers in 1 ha cuts. The opposite trend was found for dusky shrews ( Sorex monticolus Merriam), while there was no significant difference in mean abundance of deer mice ( Peromyscus maniculatus Wagner) among treatments. Trappability, proportion of adult females breeding, and rate of survival of red-backed voles and deer mice were similar among treatments. Our results suggest that group-selection silviculture conducted in subalpine forests may have fewer negative impacts on the small-mammal community than large clearcuts.

Bird assemblages in isolated Ficus trees in Kenyan farmland

2006 ◽  
Vol 22 (6) ◽  
pp. 723-726 ◽  
Author(s):  
G. W. Eshiamwata ◽  
D. G. Berens ◽  
B. Bleher ◽  
W. R. J. Dean ◽  
K. Böhning-Gaese
Keyword(s):  
Tropical Forests ◽  
Forest Fragmentation ◽  
Seedling Establishment ◽  
Agricultural Land ◽  
Agricultural Landscapes ◽  
Forest Patches ◽  
Frugivorous Birds ◽  
Fragmented Forest ◽  
Important Group ◽  
Disturbed Areas

Over the last few decades a rapid and extensive conversion of tropical forests to agricultural land has taken place resulting in mosaics of fragmented forest patches, pastures and farmland. While the effects of forest fragmentation on biodiversity have been intensively studied within the remaining forests, relatively little is known about the biodiversity in tropical farmland (Daily et al. 2001, Pimentel et al. 1992). Frugivorous birds are an important group of species in tropical farmland ecosystems. Frugivorous birds are significant seed dispersers and can play a prominent role in transporting seeds into disturbed areas and setting the stage for the regeneration of these systems. Isolated fleshy-fruited trees in agricultural landscapes have been shown to attract birds, leading to an increased seed rain and seedling establishment under their canopies (Carrière et al. 2002, Duncan & Chapman 1999, Guevara et al. 1986, 2004; Slocum & Horvitz 2000).

scholarly journals Landscape Factors Associated with Subterranean Termite (Isoptera: Rhinotermitidae) Treatments and Colony Structure in Residential Subdivisions

Sociobiology ◽  
2018 ◽  
Vol 65 (1) ◽  
pp. 67
Author(s):  
Paul Steven Botch ◽  
Richard M. Houseman
Keyword(s):  
Agricultural Landscapes ◽  
Subterranean Termite ◽  
Forest Patches ◽  
Significant Difference ◽  
Forested Landscapes ◽  
Undisturbed Forest ◽  
Landscape Factors ◽  
Bait Stations ◽  
Gis Software

Subterranean termites (Isoptera: Reticulitermes) are common structural pests, but it is not well known how landscape factors are associated with urban colonization. This study examined patterns of subterranean termite colonization in 13 mid-Missouri residential subdivisions. Ten- and 20-year-old homes built on historically agricultural and forested landscapes were inspected for treatment by termiticide application or bait stations. Contemporary and historical aerial imagery were analyzed using GIS software, and patterns of colonization were compared among subdivisions. The genetic structure of termite colonies collected in undeveloped landscapes and residential subdivisions was compared using microsatellite DNA. Twenty-year-old subdivisions had significantly higher treatment proportions than 10-year-old subdivisions. At year 10, historically forested subdivisions had a higher treatment proportion than historically agricultural subdivisions. By year 20, there was no significant difference in treatment proportion between historical landscape types, indicating that subdivisions built on agricultural landscapes eventually catch up to subdivisions built on forest landscapes. Although there was not strong statistical support, treated homes in historically agricultural subdivisions tended to be close to forest patches, but there was less of an association in historically forested subdivisions. Colonies in undeveloped landscapes were more inbred compared to colonies in residential subdivisions, indicating that colonies sampled in subdivisions had fewer secondary reproductive and were potentially younger than those sampled in undeveloped landscapes. This study provides some correlative support for the role of dispersing alates as urban colonizers, because treatments were often located at relatively long distances from undisturbed forest patches in historically agricultural subdivisions.

Effects of isolation on red-backed voles (Clethrionomys gapperi) and deer mice (Peromyscus maniculatus) in a sage–steppe matrix

2001 ◽  
Vol 79 (9) ◽  
pp. 1597-1603
Author(s):  
W Christopher Witt ◽  
Nancy Huntly
Keyword(s):  
Peromyscus Maniculatus ◽  
Deer Mouse ◽  
Ground Cover ◽  
Habitat Characteristics ◽  
Deer Mice ◽  
Habitat Isolation ◽  
Clethrionomys Gapperi ◽  
Habitat Specialist ◽  
Forest Patches ◽  
Naturally Occurring

Effects of habitat isolation can differ among species, thereby influencing populations both directly and indirectly. We used naturally occurring forest patches surrounded by a sage–steppe matrix in southeast Idaho to test the hypothesis that a habitat specialist, the red-backed vole (Clethrionomys gapperi), would have movements restricted and therefore population densities reduced on forest patches isolated by distances equal to or greater than their typical home-range diameter. We hypothesized that the more generalized deer mouse (Peromyscus maniculatus) would not show effects of isolation at this scale. We tested for effects of isolation on these small mammals in 1999 and 2000 in forest patches that varied in distance to a mainland forest. Densities of red-backed voles decreased with isolation and those of deer mice did not. However, strong relationships were also found between red-backed vole densities and habitat characteristics, which themselves varied with isolation. Livestock apparently had disproportionate effects on the more isolated patches, thereby altering ground cover. Isolation by distances up to 450 m appears to reduce (filter) rather than eliminate immigration of red-backed voles; however, effects of livestock on isolated habitat patches may prevent successful dispersers from populating patches.

Deer mouse trappability in relation to bait preference

1980 ◽  
Vol 58 (12) ◽  
pp. 2282-2284 ◽  
Author(s):  
Druscilla S. Sullivan ◽  
Thomas P. Sullivan
Keyword(s):  
Water Content ◽  
Small Mammals ◽  
Peromyscus Maniculatus ◽  
Deer Mouse ◽  
Peanut Butter ◽  
Deer Mice

When given the choice between traps with or without a mixture of peanut butter and oats (peanut butter balls), deer mice (Peromyscus maniculatus) preferred the former. However, trappability of deer mice was not affected by the presence of peanut butter balls. Acceptable food in live traps is essential to successful trapping of small mammals as these animals will systematically return to traps for food. The peanut butter and oatmeal mixture would increase the nutritional and possibly water content of food in the trap and is thus recommended for deer mouse trapping.

scholarly journals Alternative conifer release treatments affect small mammals in northwestern Ontario

1997 ◽  
Vol 73 (1) ◽  
pp. 99-106 ◽  
Author(s):  
R. A. Lautenschlager ◽  
F. Wayne Bell ◽  
Robert G. Wagner
Keyword(s):  
Small Mammals ◽  
Deer Mouse ◽  
Common Shrew ◽  
Growing Season ◽  
Post Treatment ◽  
Wildlife Habitat ◽  
Meadow Vole ◽  
Deer Mice ◽  
Growing Seasons ◽  
Species Specific

Density changes of small mammals responding to different conifer release treatments (motor-manual [brush saw] cutting; mechanical [Silvana Selective] cutting; helicopter-applied herbicides [Release® (a.i. triclopyr), Vision® (a.i. glyphosate)]; controls [no treatment] were quantified. A total of 4,851 small mammals were captured and released during the three-year study. The most commonly captured (81% of total) species were: shrews (masked [Sorex cinereus Kerr], pygmy [S. hoyi Baird], arctic S. arcticus Kerr]), southern red-backed voles (Clethrionomys gapperi Vigors), and deer mice (Peromyscus maniculatus Wagner). Northern short-tailed shrews (Blarina brevicauda Say), eastern (Tamias striants L.) and least (T. minimus Bachman) chipmunks, meadow voles (Microtus pennsylvanicus Ord), ermine (Mustela erminea L.), and meadow jumping mice (Zapus hudsonius Zimm.) were common. Shrew (masked, pygmy, arctic, short-tailed) densities were statistically unaffected by these treatments. Red-backed vole densities were highest on control plots during the first post-treatment growing season, and highest on control and Vision® plots during the second post-treatment growing season. During the first two growing seasons after treatment, deer mouse densities were highest on Silvana Selective plots; eastern chipmunk densities were highest on control, Vision® and Silvana Selective plots; least chipmunk densities were highest on Vision® and Release® plots; and meadow vole densities were highest on Release® plots. Small mammal responses to the alternative conifer release treatments examined were species specific one and two-growing seasons post-treatment, but similar to responses common to the standard (Vision® herbicide) conifer release treatment. Key words: conifer release, Fallingsnow Ecosystem Project, glyphosate, herbicides, Release®, small mammals, spruce plantation, triclopyr, vegetation management alternatives, Vision®, wildlife habitat

scholarly journals Responses of Bat Communities (Mammalia: Chiroptera) to Forest Loss and Habitat Conversion in Southern Cameroon

2021 ◽  
Vol 14 ◽  
pp. 194008292110103
Author(s):  
Patrick Jules Atagana ◽  
Eric Moïse Bakwo Fils ◽  
Sevilor Kekeunou
Keyword(s):  
Secondary Forest ◽  
Biosphere Reserve ◽  
Abundant Species ◽  
Primary Forest ◽  
Habitat Types ◽  
Habitat Transformation ◽  
Significant Difference ◽  
Southern Cameroon ◽  
Habitat Conversion ◽  
Species Specific

We aimed to assess how bats are affected by habitat transformation by comparing bat assemblages in four habitat types: primary forest, secondary forest, cocoa plantations and human habitations in the Dja Biosphere Reserve of southern Cameroon. Bats were sampled in the four habitat types using mist nets. During 126 nights, a total of 413 bats were captured, belonging to four families, 16 genera and 24 species. Ninety three individuals (17 species) were captured in the primary forest, followed by plantations (105 individuals, 14 species), human habitations (159 individuals, 10 species), and secondary forest (55 individuals, eight species). Megaloglossus woermanni was recorded in all the four habitats, and was the most abundant species (105 individuals). The analysis of bat assemblage between habitat types showed a statistically significant difference in species composition. The distribution of the six most abundant species ( Epomops franqueti, Megaloglossus woermanni, Rousettus aegyptiacus, Dohyrina cyclops, Hipposideros cf. caffer and Hipposideros cf. ruber) was influenced by habitat types. Our results suggest that the decrease in species richness observed in disturbed habitats may be due to habitat perturbations of primary forest habitats. Therefore, it is important to examine the effects of habitat conversion at species level, as responses are often species-specific.

scholarly journals SARS-CoV-2 infection and transmission in the North American deer mouse

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Bryan D. Griffin ◽  
Mable Chan ◽  
Nikesh Tailor ◽  
Emelissa J. Mendoza ◽  
Anders Leung ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
North American ◽  
Direct Contact ◽  
Lower Respiratory Tract ◽  
Infectious Virus ◽  
Deer Mouse ◽  
Deer Mice ◽  
The North ◽  
Wild Deer ◽  
Theoretical Risk

AbstractWidespread circulation of SARS-CoV-2 in humans raises the theoretical risk of reverse zoonosis events with wildlife, reintroductions of SARS-CoV-2 into permissive nondomesticated animals. Here we report that North American deer mice (Peromyscus maniculatus) are susceptible to SARS-CoV-2 infection following intranasal exposure to a human isolate, resulting in viral replication in the upper and lower respiratory tract with little or no signs of disease. Further, shed infectious virus is detectable in nasal washes, oropharyngeal and rectal swabs, and viral RNA is detectable in feces and occasionally urine. We further show that deer mice are capable of transmitting SARS-CoV-2 to naïve deer mice through direct contact. The extent to which these observations may translate to wild deer mouse populations remains unclear, and the risk of reverse zoonosis and/or the potential for the establishment of Peromyscus rodents as a North American reservoir for SARS-CoV-2 remains unknown.

scholarly journals Bird communities in a degraded forest biodiversity hotspot of East Africa

2021 ◽  
Author(s):  
Moses Mulwa ◽  
Mike Teucher ◽  
Werner Ulrich ◽  
Jan Christian Habel
Keyword(s):  
Tropical Forests ◽  
Agricultural Land ◽  
Bird Species ◽  
Bird Communities ◽  
Natural Forest ◽  
Tree Plantations ◽  
Agricultural Fields ◽  
Degraded Forest ◽  
Forest Patches ◽  
Small Forest

AbstractTropical forests suffer severe habitat destruction. Thus, tropical forests frequently consist today of only a few small remnants that are often embedded within a matrix of agricultural fields and tree plantations. Forest specialist species have experienced severe population declines under these circumstances. We studied bird communities based on census plots set up in a near-natural forest block, as well as degraded forest patches, tree plantations, and agricultural fields, across the Taita Hills in southern Kenya. We classified each bird species according its ecology and behavior. We quantified the land cover and landscape configuration around each census plot. Typical forest species were mainly observed in the near-natural forest block, and to a lower extent in degraded forest patches. Plantations were almost devoid of birds. Bird communities of small forest fragments were more similar to that of agricultural land than the near-natural forest block. Most frugivorous, insectivorous and nectarivorous birds occurred in forest habitats, while granivorous bird species dominated the bird communities of agricultural land. The surrounding landscape had a marginal impact on bird species composition at local sites. Our study showed that the preservation of near-natural cloud forest, including small forest patches, is essential for the conservation of forest-dependent species, and that plantations do not serve as surrogate habitats.

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