Spatial metrics effect of forest fragmentation on forest bird abundance and site occupancy probability: the influence of patch size and isolation

Modest, Robert B.; Hassan, Shombe N.; Rija, Alfan A.

doi:10.2989/00306525.2016.1160961

Cited by 5 publications

(5 citation statements)

References 52 publications

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“…Therefore, the higher S(est) and Morisita-Horn Sample Similarity Index of the Msubugwe/Zaraninge forests could be linked to their size as these two are the biggest among the forests studied. These findings also confirm results of the previous research done in the same region which revealed an area-species relationship for the forest specialist and generalist birds [19].…”

Section: Discussionsupporting

confidence: 92%

“…The Zaraninge, Kwamsisi, and Gendagenda forests however are in a relatively undisturbed state [15] (Figure 1). There are two rainy seasons: the short rains being from October to December and the long rains from March to May [19,20] was biased such that Zaraninge, which is the biggest of the study forests, had six sites. The number of mist net sites in the rest of the forests was as follows: Msubugwe (five), Gendagenda (four), and Kwamsisi (two).…”

Section: Study Areamentioning

confidence: 99%

“…The East African coastal forests are reknown for their high bird diversity and endemism [17,18]. However, these forests face uncontrolled human livelihood issues that include tree cutting, charcoal burning, and habitat clearing for agriculture [15,17,19]. These deleterious activities lead to habitat disturbance and fragmentation with eventual negative consequences on bird populations [4,18].…”

Section: Introductionmentioning

confidence: 99%

“…The few attempts include the exploratory study by Burgess et al [22], a study on bird breeding biology by Mlingwa [23], and an investigation on influence of forest disturbance on forest birds by Hassan et al [15]. A more recent study by Modest et al [19] examined effects of forest patch size on specialist and generalist birds. This narrative thus reveals a gap pertaining to information on understory bird species composition.…”

Section: Introductionmentioning

confidence: 99%

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Species Composition of Tropical Understory Birds in Threatened East African Coastal Forests Based on Capture Data

Modest¹,

Hassan²

2016

International Journal of Zoology

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The East African coastal forests are subject of haphazard modification following anthropogenic pressures including tree cutting and clearing for agriculture. These activities, which are leading cause of habitat disturbance and species loss, are the major challenge in the management of sensitive wildlife species such as forest understory birds. This study investigated species composition of understory birds in the coastal forests of northeastern Tanzania to generate information for the management of the landscape and biodiversity in the area. Using mist nets, birds were trapped from core and edge habitats of representative forest patches. Trapped birds were classified to species level and categorized into bird guilds based on their levels of forest dependence. It was found out that species richness was influenced by forest patch size rather than level of habitat disturbance. Edge habitat was also found to be important in hosting higher number of forest understory birds, especially generalists—but this should be treated with caution because following habitat destruction that is ongoing in the study area, there is a danger of generalist wiping out specialist species due to competitive exclusion. Strict control measures to stop illegal tree cutting and agricultural activities near the forests were recommended for sustainable conservation of the understory birds in the forests.

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Section: Discussionsupporting

confidence: 92%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Species Composition of Tropical Understory Birds in Threatened East African Coastal Forests Based on Capture Data

Modest¹,

Hassan²

2016

International Journal of Zoology

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“…forest fragmentation seems to affect bird populations independently of season. Several studies suggest that patch area reduction is one of the main factors explaining population declines in the context of forest fragmentation (Watson et al 2004, Bregman et al 2014, Modest et al 2016. Patch area reduction can lead to food shortage, which in turn can negatively affect bird population abundances (Zanette et al 2000, but see Verga et al 2017.…”

Section: Discussionmentioning

confidence: 99%

Avian responses to forest fragmentation during the breeding and non‐breeding seasons

Verga

Galetto

Peluc

2020

Ibis

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Forest fragmentation represents a threat to several bird species worldwide. Several factors can change across seasons (e.g. bird perception of the landscape, weather conditions, biotic interactions), which can modify the response of bird populations to forest fragmentation. However, most studies have been conducted only during the breeding season. Here we assessed the relationship between forest fragmentation (patch area and patch isolation) with population abundances of resident species during both the breeding and the non‐breeding seasons. Bird population abundances (all species in the community, subsets of forest and habitat generalist species and for individual species) were estimated across a gradient of area‐isolation in a semi‐arid forest in Cordoba, Argentina. Population abundance of the overall avian community and of the subset of forest species declined with patch area reduction independently of the season. By contrast, the subset of habitat generalist species was not affected by patch area reduction or by the increase in patch isolation, either during the breeding or during the non‐breeding season. When the analyses were carried out for individual species, we found four forest species and one habitat generalist species whose responses (the relationship between population abundance and patch area or with isolation) were different between breeding and non‐breeding seasons. The negative effects of forest fragmentation were found mainly during the breeding season. Our results suggest that reduction of patch area may lead to a reduction of more than 65% of the population abundance of forest bird species, during both the breeding and the non‐breeding season. Therefore, there is an urgent need to conserve large forest patches within the region as irreplaceable elements for the conservation of populations of several species.

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Habitat quality assessment based on local expert knowledge and landscape patterns for bird of prey species in Hamadan, Iran

Abdollahi,

Zeilabi,

2023

Model. Earth Syst. Environ.

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Spatial metrics effect of forest fragmentation on forest bird abundance and site occupancy probability: the influence of patch size and isolation

Cited by 5 publications

References 52 publications

Species Composition of Tropical Understory Birds in Threatened East African Coastal Forests Based on Capture Data

Species Composition of Tropical Understory Birds in Threatened East African Coastal Forests Based on Capture Data

Avian responses to forest fragmentation during the breeding and non‐breeding seasons

Habitat quality assessment based on local expert knowledge and landscape patterns for bird of prey species in Hamadan, Iran

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