Long-term population trends of Rhinolophus hipposideros and Myotis myotis in Poland

AbstractAn analysis of long-term changes in abundance of hibernating bats as revealed from the annual monitoring programme conducted in four mountain regions of the Western Carpathians (Muránska planina Mts, Revúcka vrchovina Mts, Slovenský kras Mts, Štiavnické vrchy Mts) during the period 1992–2009 is providing in the paper. Data from 52 hibernacula were analysed. Among 18 bat species recorded, an apparent population increase of three most abundant thermophilous and originally cave dwelling species of bats, Rhinolophus hipposideros, R. ferrumequinum, Myotis myotis, was observed. In other bat species (e.g., R. euryale, M. emarginatus, M. mystacinus, M. dasycneme, Barbastella barbastellus), population trends could not be detected and because of data scarcity, they should be evaluated from more extensive datasets obtained from a wide range of hibernacula or from a completely different type of evidence.

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Contrasting long-term population trends of beach-nesting shorebirds under shared environmental pressures

Biological Conservation ◽

10.1016/j.biocon.2021.109178 ◽

2021 ◽

Vol 260 ◽

pp. 109178

Author(s):

Eunbi Kwon ◽

Samantha Robinson ◽

Chelsea E. Weithman ◽

Daniel H. Catlin ◽

Sarah M. Karpanty ◽

...

Keyword(s):

Population Trends ◽

Environmental Pressures

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Harvest rate of sooty shearwaters (Puffinus griseus) by Rakiura Māori: a potential tool to monitor population trends?

Wildlife Research ◽

10.1071/wr02034 ◽

2004 ◽

Vol 31 (3) ◽

pp. 319 ◽

Cited By ~ 13

Author(s):

Jane Catherine Kitson

Keyword(s):

New Zealand ◽

Cross Section ◽

Large Scale ◽

Population Change ◽

Population Trends ◽

Harvest Rate ◽

General Index ◽

Careful Screening ◽

Potential Tool

Sooty shearwaters (tītī, muttonbird, Puffinus griseus) are highly abundant migratory seabirds, which return to breeding colonies in New Zealand. The Rakiura Māori annual chick harvest on islands adjacent to Rakiura (Stewart Island), is one of the last large-scale customary uses of native wildlife in New Zealand. This study aimed to establish whether the rate at which muttonbirders can extract chicks from their breeding burrows indicates population trends of sooty shearwaters. Harvest rates increased slightly with increasing chick densities on Putauhinu Island. Birders' harvest rates vary in their sensitivities to changing chick density. Therefore a monitoring panel requires careful screening to ensure that harvest rates of the birders selected are sensitive to chick density, and represents a cross-section of different islands. Though harvest rates can provide only a general index of population change, it can provide an inexpensive and feasible way to measure population trends. Detecting trends is the first step to assessing the long-term sustainability of the harvest.

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Habitat factors related to wild rabbit population trends after the initial impact of rabbit haemorrhagic disease

Wildlife Research ◽

10.1071/wr05107 ◽

2006 ◽

Vol 33 (6) ◽

pp. 467 ◽

Cited By ~ 27

Author(s):

Carlos Calvete ◽

Enrique Pelayo ◽

Javier Sampietro

Keyword(s):

Habitat Quality ◽

Population Trends ◽

Wild Rabbit ◽

Pest Species ◽

Predator Species ◽

Rabbit Population ◽

Habitat Factors ◽

Rabbit Haemorrhagic Disease ◽

Haemorrhagic Disease

The European wild rabbit (Oryctolagus cuniculus) is an introduced pest species in Australia and New Zealand. Rabbits have a devastating negative impact on agricultural production and biodiversity in these countries, and Rabbit Haemorrhagic Disease (RHD) is currently included in control strategies for rabbit populations. On the other hand, the European wild rabbit is a key native prey species in the Iberian Peninsula. Since the arrival of RHD, however, rabbit populations have undergone dramatic decreases and several predator species at risk of extinction are currently dependent on the rabbit population density. Therefore, from the point of view of biodiversity conservation, evaluating habitat correlates and trends of rabbit populations after the first RHD epizootic is of great interest to improve the long-term control or promotion of wild rabbit populations. We estimated the relationship between habitat factors and long-term population trends as well as the relationships between habitat factors and rabbit abundance 2 and 14 years after the arrival of RHD in several Iberian rabbit populations. We observed that only 26% of surveyed populations seemed to experience an increase in rabbit abundance over the last 12 years and that this increase was higher in the low-rabbit-abundance areas of l992, leading to high rabbit abundance in 2004. Our results suggested that short- and long-term impacts of RHD were related to habitat quality. The initial impact of RHD was higher in more suitable habitats, but increasing long-term population trends were positively related to good habitat quality.

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Distribution and Long-Term Population Trends of Wintering Waterbirds in Poyang Lake, China

Wetlands ◽

10.1007/s13157-017-0981-6 ◽

2017 ◽

Vol 39 (S1) ◽

pp. 125-135 ◽

Cited By ~ 5

Author(s):

Wenjuan Wang ◽

James D. Fraser ◽

Jiakuan Chen

Keyword(s):

Poyang Lake ◽

Population Trends

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Population Trends and Long-term Outlook for Oropharyngeal Cancer

JAMA Otolaryngology–Head & Neck Surgery ◽

10.1001/jamaoto.2021.3786 ◽

2021 ◽

Author(s):

Nosayaba (Nosa) Osazuwa-Peters ◽

Louise Davies

Keyword(s):

Oropharyngeal Cancer ◽

Population Trends

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Long-term declines in common breeding seabirds in Japan

Bird Conservation International ◽

10.1017/s0959270919000352 ◽

2019 ◽

Vol 30 (3) ◽

pp. 434-446

Author(s):

MASAYUKI SENZAKI ◽

AKIRA TERUI ◽

NAOKI TOMITA ◽

FUMIO SATO ◽

YOSHIHIRO FUKUDA ◽

...

Keyword(s):

State Space Model ◽

Common Species ◽

Population Trends ◽

Seabird Species ◽

Common Murre ◽

Cerorhinca Monocerata ◽

Conservation Actions ◽

Declining Species ◽

The Japanese Archipelago

SummaryGlobal seabird populations are in decline, with nearly half of all seabird species currently in an extinction crisis. Understanding long-term seabird population trends is an essential first step to inform conservation actions. In this study, we assembled historical breeding records of seabirds throughout the Japanese archipelago and quantified the long-term population trends of 10 major breeding seabird species using a hierarchical Bayesian state-space model. The model revealed that six species had increasing or no detectable trends (Short-tailed Albatross Phoebastria albatrus, Leach’s Storm Petrel Oceanodroma leucorhoa, Pelagic Cormorant Phalacrocorax pelagicus, Japanese Cormorant Phalacrocorax capillatus, Spectacled Guillemot Cepphus carbo, and Rhinoceros Auklet Cerorhinca monocerata). However, decreasing trends were found not only in nationally threatened species (Common Murre Uria aalge, and Tufted Puffin Fratercula cirrhata) but also common species that are often described as abundant (Black-tailed Gull Larus crassirostris and Slaty-backed Gull Larus schistisagus). These declining species have declined to 3–35% of baseline levels over the past 30 years. This study provides the first evidence of long-term declines in common and widespread seabirds in Japan.

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Bat Pass Duration Measurement: An Indirect Measure of Distance of Detection

Diversity ◽

10.3390/d11030047 ◽

2019 ◽

Vol 11 (3) ◽

pp. 47 ◽

Cited By ~ 3

Author(s):

Christian Kerbiriou ◽

Yves Bas ◽

Isabelle Le Viol ◽

Romain Lorrillière ◽

Justine Mougnot ◽

...

Keyword(s):

Large Scale ◽

Low Cost ◽

Strong Relationship ◽

Total Activity ◽

Flight Path ◽

Population Trends ◽

Detection Distance ◽

Indirect Measure ◽

Species Activity

Few reports have been published on detection distances of bat calls because the evaluation of detection distance is complicated. Several of the approaches used to measure detection distances are based on the researcher’s experience and judgment. More recently, multiple microphones have been used to model flight path. In this study, the validity of a low-cost and simple detectability metric was tested. We hypothesize that the duration of an echolocating-bat-pass within the area of an ultrasonic bat detector is correlated with the distance of detection. Two independent datasets from a large-scale acoustic bat survey—a total of 25,786 bat-passes from 20 taxa (18 species and two genera)—were measured. We found a strong relationship between these measures of bat-pass duration and published detection distances. The advantages of bat-pass duration measures are that, for each study, experimenters easily produce their own proxy for the distance of detection. This indirect measure of the distance of detection could be mobilized to monitor the loss in microphone sensitivity used to monitor long-term population trends. Finally, the possibility of producing an index for distance of detection provides a weight for each bat species’ activity when they are aggregated to produce a bat community metric, such as the widely used “total activity”.

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