Sex ratio alterations in terrestrial woodlice populations (Isopoda: Oniscidea) from agroecosystems subjected to different agricultural practices in Italy

Paoletti, Maurizio G.; Cantarino, Carlos Martín

doi:10.1016/s0929-1393(01)00184-6

Cited by 16 publications

(11 citation statements)

References 17 publications

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“…However, this difference was not found to be statistically significant running a t test (t = −1.085, p > .05). Paoletti and Cantarino (2002) postulated that distorted sex ratios, and especially female-biased, are likely to arise within populations subject to higher environmental disturbances. no indication has been found that male giraffe were specifically targeted in the GNP complex.…”

Section: Home Range Sizementioning

confidence: 99%

Population structure and spatial ecology of Kordofan giraffe in Garamba National Park, Democratic Republic of Congo

D'haen

Fennessy

Stabach

et al. 2019

Ecology and Evolution

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Population numbers of Kordofan giraffe (Giraffa camelopardalis antiquorum) have declined throughout its range by more than 85% in the last three decades, including in the isolated easternmost population found in the Garamba National Park (NP) in the Democratic Republic of Congo. We provide new data on the conservation status and ecology of Kordofan giraffe in Garamba NP, specifically on the current population dynamics, distribution patterns, and spatial ecology for informed conservation management decisions. Data were gathered between September 26, 2016, and August 17, 2017, through direct observation and from eight GPS satellite collars deployed in early 2016. Movements, distribution patterns, and autocorrelated kernel density home ranges were estimated using the Continuous‐Time Movement Modeling (CTMM) framework. We then compared results with home ranges calculated using the kernel density estimation (95% KDE) method. The Garamba NP population was estimated to be 45 giraffe with a female‐dominated sex ratio (35% males; 65% females), and adult‐dominated age class ratio (11.2% juveniles; 17.7% subadults; 71.1% adults). The giraffe's distribution was limited to the south‐central sector of the Park, and giraffe were divided over different areas with some degree of connectivity. The average giraffe home range size was 934.3 km2 using AKDE and 268.8 km2 using KDE. Both methods have shown surprisingly large home ranges despite of the relatively high humidity of Garamba NP. Based on the outcomes of this research, urgent conservation action is needed to protect Garamba's remaining giraffe population.

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Section: Home Range Sizementioning

confidence: 99%

Population structure and spatial ecology of Kordofan giraffe in Garamba National Park, Democratic Republic of Congo

D'haen

Fennessy

Stabach

et al. 2019

Ecology and Evolution

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“…Due to the "undifferentiated" category, a lack of "younger" individuals was observed (i.e., the early stage of youth, when the animal is no longer at the manca stage) in the population for approximately four months (SeptemberDecember 2011), probably due to the absence of mancae in previous months. Paoletti & Cantarino (2002), working with Trachelipus rathkii (Brandt, 1833), found a greater female prevalence in an impacted rural area than in preserved environments. This also occurred with terrestrial amphipods in newly colonized environments (Wildish, 1971).…”

Section: Discussionmentioning

confidence: 99%

Balloniscus glaber (Crustacea, Isopoda, Balloniscidae), a habitat specialist species in a disturbed area of Brazil

Kenne

Araujo

2015

Iheringia, Sér. Zool.

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ABSTRACT. Balloniscus glaber Araujo & Zardo, 1995 (Balloniscidae), a Neotropical Oniscidea, has been recorded historically in environments with low or no human interference. In one of these areas, it was determined as a K-strategist. Recently, however, this species was documented in a disturbed forest within urban limits. The present work revealed that the population in the urban area has high density, high number of ovigerous females and mancae in the population, a long reproductive period, and early sexual maturity. These results suggest that modified environments may provide favorable conditions and that the species is not negatively affected by human influence. KEYWORDS.Human interference, anthropogenic influence, population ecology, K-strategist, terrestrial isopods. RESUMO.Balloniscus glaber (Crustacea, Isopoda, Balloniscidae), uma espécie especialista de hábitat em uma área perturbada do Brasil. Balloniscus glaber Araujo & Zardo, 1995 (Balloniscidae), um oniscídeo Neotropical, tem sido registrado historicamente em ambientes com baixa ou sem interferência humana. Em uma dessas áreas, a espécie foi classificada como K-estrategista. No entanto, recentemente foi registrada em uma floresta perturbada dentro dos limites urbanos. O presente trabalho revela que a população na área urbana tem densidade alta, elevado número de fêmeas ovígeras e mancas, período reprodutivo longo e maturidade sexual precoce. Estes resultados sugerem que um ambiente modificado pode proporcionar condições favoráveis e que a espécie não é afetada negativamente pela influência humana.

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“…at the Boracéia Biological Station, which had a higher female proportion in the more disturbed site. In their work on the terrestrial isopod Trachelipus rathkei (Brandt, 1833), PAOLETTI & CANTARINO (2002) showed that the population from a rural habitat under strong anthropogenic disturbance presented a significantly higher prevalence of females compared to a less disturbed habitat. The authors suggest that in intensely disturbed surroundings, populations that are able to adjust their sex ratio to increase their intrinsic growth rate may be favored by natural selection; thus, female prevalence in the samples could be an indication that a population has undergone intense pressure from disturbance.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies have reported differences in the composition and structure of terrestrial isopod communities subjected to different kinds of disturbance and a female-skewed sex ratio in populations from disturbed areas (PAOLETTI & CANTARINO 2002, HASSALL et al 2006, MOSS & HASSALL 2006, VILISICS et al 2007). Despite their potential as biological indicators, however, only few reports to date has addressed the responses of these crustaceans to anthropogenic disturbance in the Neotropics (e.g.…”

mentioning

confidence: 99%

The effects of four types of anthropogenic disturbances on composition and abundance of terrestrial isopods (Isopoda: Oniscidea)

Magrini

Freitas

Uehara‐Prado³

2011

Zoologia (Curitiba, Impr.)

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ABSTRACT. The Brazilian Atlantic Forest is currently reduced to about 12% of its original range. Among the components that make up its great diversity, there are species with the potential to be bioindicators, which can be very important for conservation-oriented studies. This study compares the species composition, abundance and sex ratio of terrestrial isopods in sites that show different anthropogenic disturbance histories and are located within four reserves in the Atlantic Forest of southwestern Brazil. Our study explores these crustaceans as indicators of anthropogenic disturbance.The influence of one of the following factors was explored in each protected area: 1) history of vegetation harvesting, 2) trail management, 3) Eucalyptus planting, and 4) edge effect. A total of 2,217 individuals of six species (Atlantoscia sp., Benthana werneri Lemos de Castro, 1958, Pseudodiploexochus tabularis (Barnard, 1932, Pudeoniscus obscures Lemos de Castro, 1973, Styloniscus spinosus (Patience, 1907, and Trichorhina sp.) were captured in pitfall traps. The composition of isopod species was different between most of the contrasting sites within reserves, and was similar among the less disturbed sites of different reserves. The total number of isopod individuals and the sex ratio were not different between the contrasting sites within most of the reserves and only the sex ratio of Atlantoscia sp. differed between contrasting sites of one protected area. Upon an individual analysis of each species, S. spinosus (an exotic species) was most abundant in more disturbed sites. The distributions of B. werneri and Atlantoscia sp. over time were relatively synchronous, except where S. spinosus was abundant. Our results also indicate that the exotic species S. spinosus may benefit from the vegetation mosaic produced by disturbance, so differences in abundance of this species may be useful for bioindication.A change in the spatial and temporal structure of Oniscidea communities caused by anthropogenic disturbance may have a cascade effect on ecological cycles because terrestrial isopods play a fundamental role in nutrient cycling.

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Sex ratio alterations in terrestrial woodlice populations (Isopoda: Oniscidea) from agroecosystems subjected to different agricultural practices in Italy

Cited by 16 publications

References 17 publications

Population structure and spatial ecology of Kordofan giraffe in Garamba National Park, Democratic Republic of Congo

Population structure and spatial ecology of Kordofan giraffe in Garamba National Park, Democratic Republic of Congo

Balloniscus glaber (Crustacea, Isopoda, Balloniscidae), a habitat specialist species in a disturbed area of Brazil

The effects of four types of anthropogenic disturbances on composition and abundance of terrestrial isopods (Isopoda: Oniscidea)

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