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174 results for “seahorse”
Fig. 4 in Disruptive coloration and habitat use by seahorses
Fig. 4. Plain-colored (Left column) seahorses occupy similar background color, while banded disruptive seahorses (Right column) occupy more diverse habitats.
Fig. 4. Hippocampus colemani, this specimen not collected. A in A New Pygmy Seahorse (Pisces: Syngnathidae: Hippocampus) from Lord Howe Island
Fig. 4. Hippocampus colemani, this specimen not collected. A probable male as it appears to have a pouch. Photo by Neville Coleman.
Fig. 1. Hippocampus colemani, holotype AMS I41181-001 in A New Pygmy Seahorse (Pisces: Syngnathidae: Hippocampus) from Lord Howe Island
Fig. 1. Hippocampus colemani, holotype AMS I41181-001 (left) and paratype AMS I41181-002 (right), both female.
FIGURE 4 in Population structure of the seahorse Hippocampus reidi (Syngnathiformes: Syngnathidae) in a Brazilian semi-arid estuary
FIGURE 4 | Proportion of color patterns (A) and holdfast use (B) of Hippocampus reidi in the Pacoti River estuary, Ceará, Brazil, between December 2017 and November 2018.
FIGURE 3 in Population structure of the seahorse Hippocampus reidi (Syngnathiformes: Syngnathidae) in a Brazilian semi-arid estuary
FIGURE 3 | Spatial variation in the proportion of pregnant males of Hippocampus reidi along the salinity gradient in the Pacoti River estuary, Ceará, Brazil, between December 2017 and November 2018. Y = pregnant male record, N = non-pregnant male record.
FIGURE 2 in Population structure of the seahorse Hippocampus reidi (Syngnathiformes: Syngnathidae) in a Brazilian semi-arid estuary
FIGURE 2 | Temporal variation of environmental variables: (A) salinity and (B) water transparency (cm), and Hippocampus reidi population variables: (C) population density (ind.m-2), (D) proportion of pregnant males (Y = pregnant male record, N = non-pregnant male record) and (E) individual height (cm), in the Pacoti River estuary, Ceará, Brazil, between December 2017 and November 2018. The months of the rainy season are highlighted in blue.
FIGURE 1 in Population structure of the seahorse Hippocampus reidi (Syngnathiformes: Syngnathidae) in a Brazilian semi-arid estuary
FIGURE 1 | Geographic location of the Pacoti River estuary, Ceará, Brazil (A, B), indicating Hippocampus reidi sampling locations (A to K) (C).
Fig. 3 in Scientific Note Novel sex-related characteristics of the longsnout seahorse Hippocampus reidi Ginsburg, 1933
Fig. 3. Occurrence of dorsolateral spots according to height in males of Hippocampus reidi. Males presenting dorsolateral spots (black bars); males without dorsolateral spots (grey bars).
Fig. 1. A in Scientific Note Novel sex-related characteristics of the longsnout seahorse Hippocampus reidi Ginsburg, 1933
Fig. 1. A captive-reared male of Hippocampus reidi, showing (A) the prominent and pigmented keel and (B) dorsolateral spots. Photo credits: T. P. R. Oliveira.
Fig. 2 in Scientific Note Novel sex-related characteristics of the longsnout seahorse Hippocampus reidi Ginsburg, 1933
Fig. 2. Occurrence of dorsolateral spots according to sex in Hippocampus reidi. Specimens presenting dorsolateral spots (black bars); specimens without dorsolateral spots (grey bars). (*) Significant difference (p <0.001).
Figure 1. - Map showing the locations where seahorses H. hippocampus were recorded. 1 in Variables psicológicas implicadas en el desempeño laboral docente
Figure 1. - Map showing the locations where seahorses H. hippocampus were recorded. 1: Bueu; 2: Toralla Island.
Figure 1 in First record of the near threatened native seahorse Hippocampus reidi (Teleostei: Syngnathidae) in an ecosystem dominated by the invasive seagrass Halophila stipulacea in the Caribbean Sea
Figure 1. – Specimen of Hippocampus reidi Ginsburg, 1933, photographed in a dense Halophila stipulacea seagrass bed on the west coast of Martinique Island, on 9th June 2017.
Fig. 2 in Assessing diet composition of seahorses in the wild using a non destructive method: Hippocampus reidi (Teleostei: Syngnathidae) as a study-case
Fig. 2. Feeding strategy diagram. Prey-specific abundance plotted against frequency of occurrence of prey items in the diet of the seahorse Hippocampus reidi (n = 280). Prey items: 1. Nematoda, 2. Copepoda, (Harpacticoida), 3. Caridae, 4. Copepoda (nauplii), 5. Copepoda (Calanoida), 6. Copepoda (Cyclopoida), 7. Caridae (chelipods), 8. Teleostei (Gobiidae), 9. Insecta (Hymenoptera), 10. Amphipoda (Gammaridae), 11. Teleostei (scales), 12. Polichaeta (larvae), 13. Amphipoda (Caprellidae), 14. Ostracoda, 15. Eggs (possibly of mollusks or crustaceans), 16. Polichaeta (Nereididae), 17. Brachyura (nauplii), 18. Insecta (Chironomidae), 19. Crustacea (larvae), 20. Gastropoda (larvae), 21. Bivalvia (larvae), 22. Caridae (zoea), 23. Isopoda, 24. Oligochaeta, 25. Foraminifera.
Fig. 1 in Assessing diet composition of seahorses in the wild using a non destructive method: Hippocampus reidi (Teleostei: Syngnathidae) as a study-case
Fig. 1. Mean values of induction (square) and recovery (lozenge) times of Hippocampus reidi (n = 242) in seconds (box = standard error; whisker = standard deviation). Reproduc- tive state: IM = immature, OF = ovipositor region flat, OB = ovipositor region bulging, B = brooding, NB = non-brooding. Sex: U = undetermined, F = female, M = male.
Fig. 6 in Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study
Fig. 6. Number of fishers and of syngnathids captured for ornamental purposes in Salvador, Bahia, Brazil, from January/ 1997 to June/2005.
Fig. 5 in Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study
Fig. 5. Number of days of collection and number of fishers involved in the syngnathid fishery in Salvador, Bahia, Brazil, from January/1997 to June/2005.
Fig. 1 in Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study
Fig. 1. Map showing the Baía de Todos os Santos, the main area of collection of live syngnathids in Salvador, Bahia State, NE Brazil.
Fig. 3. a in Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study
Fig. 3. a) Specimen of Micrognathus sp., Baía de Todos os Santos, Bahia State, Brazil. b) Specimen of Cosmocampus albirostris, Baía de Todos os Santos, Bahia State, Brazil. Photos: Cláudio L. S. Sampaio.
Fig. 4 in Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study
Fig. 4. Hooka-diver using hand-nets to collect marine ornamental fishes. Baía de Todos os Santos, Bahia State, Brazil. Photo: Leo Dutra.
Home range use in the West Australian seahorse Hippocampus subelongatus is influenced by sex and partner's home range but not by body size or paired status
<p><span>These data and scripts form the basis for </span>Kvarnemo C, Andersson SE, Elisson J, Moore GI and Jones AG (2021). Home range use in the West Australian seahorse <em>Hippocampus subelongatus</em> is influenced by sex and partner's home range but not by body size or paired status. Journal of Ethology 39: 235–248. https://doi.org/10.1007/s10164-021-00698-y. The abstract below is from this paper:</p> <p>Genetic monogamy is the rule for many species of seahorse, including the West Australian seahorse Hippocampus subelongatus. In this paper, we revisit mark-recapture and genetic data of H. subelongatus, allowing a detailed characterization of movement distances, home range sizes and home range overlaps for each individual of known sex, paired status (paired or unpaired) and body size. As predicted, we find that females have larger home ranges and move greater distances compared to males. We also confirm our prediction that the home ranges of pair-bonded individuals (members of a pair known to reproduce together) overlap more on average than home ranges of randomly chosen individuals of the opposite or same sex. Both sexes, regardless of paired status, had home ranges that overlapped with, on average, 6–10 opposite-sex individuals. The average overlap area among female home ranges was significantly larger than the overlap among male home ranges, probably reflecting females having larger home ranges combined with a female biased adult sex ratio. Despite a prediction that unpaired individuals would need to move around to find a mate, we find no evidence that unpaired members of either sex moved more than paired individuals of the same sex. We also find no effect of body size on home range size, distance moved or number of other individuals with which a home range overlapped. These patterns of movement and overlap in home ranges among individuals of both sexes suggest that low mate availability is not a likely explanation for the maintenance of monogamy in the West Australian seahorse.</p>
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