An Evaluation of the Removal Method of Estimating Animal Populations

Zippin, Calvin

doi:10.2307/3001759

Cited by 532 publications

(415 citation statements)

References 12 publications

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“…De nombreuses publications indiquent que cette méthode d'épuisement des stocks sous-estime le plus souvent de 20 % environ la taille réelle des populations (voir par exemple BOHLIN et UNDSTROM, 1977 ;MAHON, 1980). Mais ces auteurs ont utilisé la formule de ZIPPIN (1956) pour étayer leurs propos alors que la formule de CARLE et STRUB (1978), que nous avons utilisée, produit des biais négatifs moins importants et est plus robuste parce qu'elle supporte des conditions d'application moins sévères (cowx, 1983 ;GERDEAUX, 1987). Certes, la question n'est pas tranchée, et les valeurs présentées ici restent encore à préciser, mais elles fournissent néanmoins un ordre de grandeur de la taille des populations étudiées.…”

Section: -Discussionunclassified

Le marais doux endigué de Bourgneuf-Machecoul (Pays de Loire) Premier éléments de connaissance du peuplement piscicole. Relation ichtyofaune-habitat et problèmes majeurs de gestion (Maroc)

Feunteun¹,

Rigaud²,

Élie³

et al. 2005

rseau

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Le peuplement ichtyologique d'un marais littoral endigué, géré en eau douce, a été étudié sur une zone de 2 700 ha, située au nord du marais Breton-Vendéen (Loire-Atlantique, France). Le réseau hydraulique, qui représente près de 16 % de cette surface, se compose, d'environ 91 m de linéaire de fossés par ha (en tout 234 km) et de bassins présents uniquement dans la partie d'origine salicole du marais. Les hauteurs d'eau, l'envasement et le recouvrement par la végétation aquatique dépendent de la gestion humaine et sont très variables (moyennes respectives : 42 cm; 43 cm; 70 %). Cela se traduit par un morcellement spatial de l'habitat pour les poissons. La stratégie d'échantillonnage adoptée, qui tient compte de cette hétérogénéité, a permis de décrire un peuplement comportant 21 espèces. Dominé par les poissons-chats et par les anguilles, ce dernier est caractéristique de la zone à brèmes des cours d'eau. Les abondances sont relativement élevées (en moyenne 315 kg/ha et 11 460 poissons/ha), mais elles sont très hétérogènes. L'évolution qualitative et quantitative de la répartition spatio-temporelle est décrite à l'aide d'une analyse factorielle des correspondances portant sur 74 échantillons prélevés par pêche électrique entre 1987 et 1989. Bien que l'approche de ce milieu soit complexe et les références bibliographiques relativement rares, l'analyse des premières données permet d'ores et déjà d'identifier quelques problèmes de gestion ayant des répercussions directes sur le peuplement piscicole de cette zone.The dammed up marshes of the French Atlantic coast cover about 200 000 ha between River Vilaine and the « Bassin d'Arcachon ». Eighty eight % are managed with freshwater. They constitute original environments initially created for agriculture or for salt production, and they are now threatened by land abandonment within the next decade. Concurrently to aquaculture (in created or existing ponds), exploitation of the fish stocks in the ditchweb is likely to encourage a diversification of agricultural activities. Unfortunately, bibliographic analysis reveals the relative scarceness of research about sampling methods and qualitative or quantitative characteristics of these fish communities. This is quite surprising considering the importance of the ditchwed of this kind of environment outlined by several authors. In the Netherlands, BELTMANN (1984) assessed that there is a total of 400 000 km of ditches. In France, the littoral dyked marshes of the Atlantic coast couid comprise 20 000 km of ditches and about 24 000 ha of open water. The present work provides for the first data on the fish community of Bourgneuf marsh.The northern part of the marsh of Bourgneuf, 2 700 ha provided whith f reshwater, contains nearly every kind of landscapes found throughout the whole Breton-Vendéen marsh. The pattern of the ditch network strongly changes from a zone to another (fig.1) : presence of former salt pans in the western part, regular geometric shapes in the recently created polders next to the River Falleron, irregular di...

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Section: -Discussionunclassified

Le marais doux endigué de Bourgneuf-Machecoul (Pays de Loire) Premier éléments de connaissance du peuplement piscicole. Relation ichtyofaune-habitat et problèmes majeurs de gestion (Maroc)

Feunteun¹,

Rigaud²,

Élie³

et al. 2005

rseau

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“…Revista Brasileira de Zoologia 23 (4): 1101-1110, dezembro 2006 ção do método de ZIPPIN (1958), sendo os resultados expresso em número de indivíduos e quilogramas por hectare.…”

Section: Coleta Dos Dadosunclassified

Influência da urbanização sobre as assembléias de peixes em três córregos de Maringá, Paraná

2006

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O objetivo do presente estudo foi avaliar padrões espaciais na composição, estrutura e distribuição das assembléias de peixes e suas relações com características abióticas em três córregos urbanos da cidade de Maringá, Paraná, Brasil. Peixes foram coletados ao longo de um gradiente longitudinal utilizando pesca elétrica nos meses de maio e novembro de 2004. Temperatura, nitrogênio, pH, oxigênio e fósforo foram as variáveis que mais influenciaram a análise de componentes principais (CPA). Riqueza, eqüitabilidade, índice de diversidade de Shannon-Wiener e o primeiro eixo da análise de correspondência com remoção do efeito do arco (DCA) foram diretamente correlacionados com características ligadas ao impacto químico urbano. Adição de espécies prevaleceu nas estações de amostragem do córrego Miosótis e entre a cabeceira e porção intermediária nos córregos Nazaré e Mandacaru. Substituição ocorreu entre as porções intermediárias e foz desses córregos. A dominância da espécie tolerante Poecilia reticulata Peters, 1859 indicou a influência do impacto do meio urbano sobre as assembléias de peixes.

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“…Each 90-m sample was divided into three 30-m subsections (upstream, A; middle, B; downstream, C) ( Figure 1). We conducted three-to four-pass depletion population estimates using electrofishing (Zippin 1956) During the June 2005 sampling, all Potomac sculpin captured in subsections A (upstream) and C (downstream) were measured to the nearest millimeter in total length (TL) and given a visible implant elastomer (VIE) mark unique to each of the subsections (Roberts and Angermeier 2004; Figure 1). All fish were then released in the middle of the subsection of capture.…”

Section: Methodsmentioning

confidence: 99%

Movement and Recolonization of Potomac Sculpin in a Virginia Stream

Hudy¹,

Shiflet²

2009

N American J Fish Manag

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Abstract.-Movement patterns of benthic fishes have not been widely studied, but an understanding of those movement patterns may be necessary in assessing the full effects of habitat fragmentation and the need to restore connectivity in fragmented watersheds. We evaluated nonspawning movement of 3,353 marked Potomac sculpin Cottus girardi over a 1-year period on a 3.14-km segment of a third-order stream. In addition, we conducted a fish removal experiment at the pool-riffle sequence scale (90 m) to evaluate the effects of fish density on movement and recolonization rates. The majority of recaptured Potomac sculpin stayed within 30 m of their original capture location throughout the study (81% at 30 d; 64% at 75 d; 53% at 363 d). Upstream (US) movement was greater than downstream (DS) movement at 30 d (US 17%; DS 3%), 75 d (US 30%, DS 6%) and 363 d (US 32%, DS 15%). After 75 d, 10% of the fish that moved upstream moved more than 250 m (21% after 363 d). The maximum distance moved was 1,711 m in 75 d. There were no significant differences in mean total length between recaptured Potomac sculpin that either moved or did not move or between upstream and downstream movers. The presence or absence of fishes in adjacent 30-m habitat sections influenced upstream, but not downstream, movement of Potomac sculpin. After 30 d, Potomac sculpin population densities and size structure were similar between fish removal and reference sections. We found our results to be similar to those of other studies, which found that, on average, freshwater sculpin are sedentary. However, we identified great dispersal capabilities (.250 m) for a small percentage of Potomac sculpin. The long dispersal distances suggest that this typically sedentary species may need greater habitat connectivity than previously assumed.Information on movement is necessary for assessing the full effects of fragmentation and a species' population needs when restoring connectivity in fragmented watersheds. The short-term and long-term movement patterns of many benthic fishes are unknown, but, in general, home ranges appear to be small. While there has been considerable research on fish movements in general (see reviews by Gowan et al. 1994;Matthews 1998;Rodriguez 2002), most work has focused on salmonids and other sport fish.Previous research has indicated that most freshwater sculpins (Cottidae) do not move frequently or far (see Table 1 for a detailed summary), but no current information has been published on the movement patterns of Potomac sculpin Cottus girardi. Matheson (1979) and Jenkins and Burkhead (1993) do, however, summarize the general ecology and taxonomy of the Potomac sculpin.Bailey (1952) concluded that mottled sculpin Cottus bairdii were relatively sedentary, with typical yearly movements of 50 m. McCleave (1964) estimated the home range of mottled sculpin to be less than 50 m. In two Montana streams, mottled sculpin movement during nonspawning times (June and July) was found to be short (mean ¼ 1.2 m) and haphazard (no preference for upstream or ...

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An Evaluation of the Removal Method of Estimating Animal Populations

Cited by 532 publications

References 12 publications

Le marais doux endigué de Bourgneuf-Machecoul (Pays de Loire) Premier éléments de connaissance du peuplement piscicole. Relation ichtyofaune-habitat et problèmes majeurs de gestion (Maroc)

Le marais doux endigué de Bourgneuf-Machecoul (Pays de Loire) Premier éléments de connaissance du peuplement piscicole. Relation ichtyofaune-habitat et problèmes majeurs de gestion (Maroc)

Influência da urbanização sobre as assembléias de peixes em três córregos de Maringá, Paraná

Movement and Recolonization of Potomac Sculpin in a Virginia Stream

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