Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters
ABSTRACT Demographic information is the basis for evaluating and planning conservation strategies for an endangered species. However, in numerous situations there are methodological or financial limitations to obtain such information for some species. The marsh deer, an endangered Neotropical cervid...
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| Format: | Article |
| Language: | English |
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Fundação Zoobotânica do Rio Grande do Sul
2017-11-01
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| Series: | Iheringia: Série Zoologia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100241&lng=en&tlng=en |
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| author | Pedro Henrique F. Peres Maxihilian S. Polverini Márcio L. Oliveira José Maurício B. Duarte |
| author_facet | Pedro Henrique F. Peres Maxihilian S. Polverini Márcio L. Oliveira José Maurício B. Duarte |
| author_sort | Pedro Henrique F. Peres |
| collection | DOAJ |
| description | ABSTRACT Demographic information is the basis for evaluating and planning conservation strategies for an endangered species. However, in numerous situations there are methodological or financial limitations to obtain such information for some species. The marsh deer, an endangered Neotropical cervid, is a challenging species to obtain biological information. To help achieve such aims, the study evaluated the applicability of camera traps to obtain demographic information on the marsh deer compared to the traditional aerial census method. Fourteen camera traps were installed for three months on the Capão da Cruz floodplain, in state of São Paulo, and ten helicopter flyovers were made along a 13-kilometer trajectory to detect resident marsh deer. In addition to counting deer, the study aimed to identify the sex, age group and individual identification of the antlered males recorded. Population estimates were performed using the capture-mark-recapture method with the camera trap data and by the distance sampling method for aerial observation data. The costs and field efforts expended for both methodologies were calculated and compared. Twenty independent photographic records and 42 sightings were obtained and generated estimates of 0.98 and 1.06 ind/km², respectively. In contrast to the aerial census, camera traps allowed us to individually identify branch-antlered males, determine the sex ratio and detect fawns in the population. The cost of camera traps was 78% lower but required 20 times more field effort. Our analysis indicates that camera traps present a superior cost-benefit ratio compared to aerial surveys, since they are more informative, cheaper and offer simpler logistics. Their application extends the possibilities of studying a greater number of populations in a long-term monitoring. |
| first_indexed | 2024-12-13T12:16:44Z |
| format | Article |
| id | doaj.art-535ac3e34afb4b008a7d31234e3d1eb7 |
| institution | Directory Open Access Journal |
| issn | 1678-4766 |
| language | English |
| last_indexed | 2024-12-13T12:16:44Z |
| publishDate | 2017-11-01 |
| publisher | Fundação Zoobotânica do Rio Grande do Sul |
| record_format | Article |
| series | Iheringia: Série Zoologia |
| spelling | doaj.art-535ac3e34afb4b008a7d31234e3d1eb72022-12-21T23:46:42ZengFundação Zoobotânica do Rio Grande do SulIheringia: Série Zoologia1678-47662017-11-01107010.1590/1678-4766e2017041S0073-47212017000100241Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parametersPedro Henrique F. PeresMaxihilian S. PolveriniMárcio L. OliveiraJosé Maurício B. DuarteABSTRACT Demographic information is the basis for evaluating and planning conservation strategies for an endangered species. However, in numerous situations there are methodological or financial limitations to obtain such information for some species. The marsh deer, an endangered Neotropical cervid, is a challenging species to obtain biological information. To help achieve such aims, the study evaluated the applicability of camera traps to obtain demographic information on the marsh deer compared to the traditional aerial census method. Fourteen camera traps were installed for three months on the Capão da Cruz floodplain, in state of São Paulo, and ten helicopter flyovers were made along a 13-kilometer trajectory to detect resident marsh deer. In addition to counting deer, the study aimed to identify the sex, age group and individual identification of the antlered males recorded. Population estimates were performed using the capture-mark-recapture method with the camera trap data and by the distance sampling method for aerial observation data. The costs and field efforts expended for both methodologies were calculated and compared. Twenty independent photographic records and 42 sightings were obtained and generated estimates of 0.98 and 1.06 ind/km², respectively. In contrast to the aerial census, camera traps allowed us to individually identify branch-antlered males, determine the sex ratio and detect fawns in the population. The cost of camera traps was 78% lower but required 20 times more field effort. Our analysis indicates that camera traps present a superior cost-benefit ratio compared to aerial surveys, since they are more informative, cheaper and offer simpler logistics. Their application extends the possibilities of studying a greater number of populations in a long-term monitoring.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100241&lng=en&tlng=enAerial surveycapture-recapturedistance samplingpopulation estimatesex ratio |
| spellingShingle | Pedro Henrique F. Peres Maxihilian S. Polverini Márcio L. Oliveira José Maurício B. Duarte Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters Iheringia: Série Zoologia Aerial survey capture-recapture distance sampling population estimate sex ratio |
| title | Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters |
| title_full | Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters |
| title_fullStr | Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters |
| title_full_unstemmed | Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters |
| title_short | Accessing camera trap survey feasibility for estimating Blastocerus dichotomus (Cetartiodactyla, Cervidae) demographic parameters |
| title_sort | accessing camera trap survey feasibility for estimating blastocerus dichotomus cetartiodactyla cervidae demographic parameters |
| topic | Aerial survey capture-recapture distance sampling population estimate sex ratio |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100241&lng=en&tlng=en |
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