Untersuchungen zur reproduktiven Fitness an lebenden männlichen Feldhasen aus unterschiedlichen Habitaten

Blöttner, S.; Lange, Alexander; Göritz, Frank; Fassbender, M; Broich, Alexandra; Quest, M; Gilles, M.; Lengwinat, T.; Hildebrandt, Thomas B.

doi:10.1007/bf02239820

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…2), regardless of the season (see Table 2). We determined that the quantity of sperm and the weights of the testes were in direct dependency (p<0.0001), directly following the line of activity and standstill in the season, which confirms the results by Blottner et al (2000Blottner et al ( , 2001.…”

Section: Resultssupporting

confidence: 87%

European brown hare (Lepus europaeus Pall.) testes weights from different seasons and ages from Bulgaria

Zhelev¹,

Ninov²

2022

SBAL

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Testis weights on 315 European brown hare from different ages were measured during the whole year around in Bulgaria and testicular activity was studied. From the results, we determinate, that the active reproductive season finish at end of August and beginning of September, whereupon follow period of calm when the testis weights were lowest. In September, October, and the beginning of November, the weights of the testes were low. The first indications for starting of the new reproductive season were shown in November, gradually with growth of the testis weights. In January the testis weights reached high levels, as the highest weights were measured in May-June and with a bit lower values in July and August. After this follow low weights, when the calm period started in September and the testis growth is reactive in December. All adult males (above 1 year old, determined by dry eye lens weights, n = 160), had high significant values (p< 0.0001) of testis weights during the whole year, compare with all young ones (under 1 year old, determined by dry eye lens weights, n = 155). The results showed that normal reproductive cycle with periods of activity and calm in male European brown hares from Bulgaria. The distribution of testes weights, compared to the various ages, follows the same sequence, as at the sperm density (we assigned sperm quantity for each individual in the epidydimides to five classes: 1 – no sperm, 2 – very little, 3 – moderately present, 4 – high amount, 5 – massive amount). View of the fact that the density of sperm is defined by the tail of the epididymis, and the weights were measured from the testes, the connection between them confirms the proofs about the existence of a normal reproductive cycle with stages of activity and standstill. The heaviest testes had the biggest quantity of sperm in the epididymis, independently from the season. We defined, that the quantity of sperm and the weights of the testes were in direct dependency (p < 0.0001), as exactly following the line of activity and standstill in the seasons.

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Section: Resultssupporting

confidence: 87%

European brown hare (Lepus europaeus Pall.) testes weights from different seasons and ages from Bulgaria

Zhelev¹,

Ninov²

2022

SBAL

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“…The search strategy yielded a total of 263 manuscripts describing health assessments in living non-captive vertebrates (search strategy available as Supplementary Material; dataset and references included are available under https://doi.org/10.25903/5f31f85aa8011). These manuscripts represented 261 distinct studies as two authors published two separate papers sourced from the same study (Blottner et al 2001;Goritz et al 2001;). We will therefore refer to 261 studies throughout the review.…”

Section: Resultsmentioning

confidence: 99%

Importance of health assessments for conservation in noncaptive wildlife

Kophamel

Illing

Ariel

et al. 2021

Conservation Biology

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This article is protected by copyright. All rights reserved.Wildlife health assessments help identify populations at risk of starvation, disease, and decline from anthropogenic impacts on natural habitats. Here, we provide an overview of available health assessment studies in non-captive vertebrates, and propose a framework to strategically integrate health assessments in population monitoring. Using a systematic approach, we performed a thorough assessment of studies examining multiple health parameters of non-captive vertebrate species from 1982 to 2020 (n=261). We quantified trends in study design and diagnostic methods across taxa. We found a spatial mismatch between biodiversity hotspots and study location. Only 35% of studies involved international or cross-border collaboration. IUCN Red List non-threatened species represented 49% of species assessed, a trend likely associated with the regional focus of most studies. We identified a critical need for using statistically adequate sample sizes for studies establishing reference ranges, and strongly suggest following strict protocols when planning the study design. The main health assessment methods used across all taxa were blood analysis (89%), body composition assessment methods (81%), physical examination (72%) and faecal analysis (24% of studies). Based on our findings, we propose a conceptual framework for improved design and standardization for quality wildlife health assessments. Integrating a physiological and ecological understanding of species resilience towards threatening processes will enable informed decision making regarding the conservation of threatened species.

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“…The older hares may earlier participate in reproduction. During the examination of the reproductive fitness of 138 male brown hares in Germany, no disturbance of spermitogenesis could be observed, although the samples came from a habitat with both high and low hare population density (Blottner et al, 2001).…”

Section: Tests Of Weight Of Testiclesmentioning

confidence: 99%

A High Genetic Similarity Among the Selected Mango (Mangifera Indica L.) Genotypes-Cultivars Demonstrated by SSR Fingerprinting Assay

2020

THE JAPS

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A decreasing tendency in the populations of the European brown hare can be observed in the whole of Europe from the mid-1960s to the present day. Among the reasons for declining populations fertility indicators of females are also mentioned. The aim of our study was to determine the reproductive parameters of the species in eastern Hungary. During the years 2015-2016, we studied two hundred animals (121♀, 79♂). Altogether, 121 uteri (81 adult and 40 juvenile) and 79 testicles were examined. The number of placental scars showed us the number of offspring in reproductive periods. The age of hares was estimated based on the weight of dried eye lens. The number of placental scars in the general linear model was significantly affected by hunting areas, the age of animals, the interaction of the former two, and also by body weight and kidney fat indices. The age of hares, the hunting year, the effect of the interaction of the former two, and body weight seriously contributed to the weight of the testicles. Based on the number of placental scars, 70.37% of adult and 62.50% of juvenile females were proved to be capable of reproduction. One can conclude from the above that although fertility indicators may play an important role in the decreasing trend in the numbers of Hungarian brown hare populations, they are definitely not the main causes.

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Untersuchungen zur reproduktiven Fitness an lebenden männlichen Feldhasen aus unterschiedlichen Habitaten

Cited by 5 publications

References 5 publications

European brown hare (Lepus europaeus Pall.) testes weights from different seasons and ages from Bulgaria

European brown hare (Lepus europaeus Pall.) testes weights from different seasons and ages from Bulgaria

Importance of health assessments for conservation in noncaptive wildlife

A High Genetic Similarity Among the Selected Mango (Mangifera Indica L.) Genotypes-Cultivars Demonstrated by SSR Fingerprinting Assay

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